401k Plan data: SUMMIT MATERIALS 401(K) RETIREMENT PLAN plan

SUMMIT MATERIALS 401(K) RETIREMENT PLAN 401k Plan overview

Plan Name	SUMMIT MATERIALS 401(K) RETIREMENT PLAN
Plan identification number	002

SUMMIT MATERIALS 401(K) RETIREMENT PLAN Benefits

401k Plan Type

Defined Contribution Pension

Plan Features/Benefits

Profit-sharing
ERISA section 404(c) Plan - This plan, or any part of it is intended to meet the conditions of 29 CFR 2550.404c-1.
Total participant-directed account plan - Participants have the opportunity to direct the investment of all the assets allocated to their individual accounts, regardless of whether 29 CFR 2550.404c-1 is intended to be met.
Code section 401(k) feature - A cash or deferred arrangement described in Code section 401(k) that is part of a qualified defined contribution plan that provides for an election by employees to defer part of their compensation or receive these amounts in cash.
Code section 401(m) arrangement - Employee contributions are allocated to separate accounts under the plan or employer contributions are based, in whole or in part, on employee deferrals or contribtions to the plan. Not applicable if plan is 401(k) plan with only QNECs and/or QMACs. Also not applicable if Code section 403(b)(1), 403(b)(7) or 408 arrangements/accounts/annuities.
Participant-directed brokerage accounts provided as an investment option under the plan.
Plan provides for automatic enrollment in plan that has employee contributions deducted from payroll.
Total or partial participant-directed account plan - plan uses default investment account for participants who fail to direct assets in their account.
Master plan - A pension plan that is made available by a sponsor for adoption by employers; that is the subject of a favorable opinion letter; and for which a single funding medium (for example, a trust or custodial account) is established for the joint use of all adopting employers.
Plan sponsor(s) is (are) a member(s) of a controlled group (Code sections 414(b), (c), or (m)).

401k Sponsoring company profile

SUMMIT MATERIALS, LLC. has sponsored the creation of one or more 401k plans.

Company Name: SUMMIT MATERIALS, LLC.

Employer identification number (EIN): 264138486

NAIC Classification: 237310
NAIC Description: Highway, Street, and Bridge Construction

Form 5500 Filing Information

Submission information for form 5500 for 401k plan SUMMIT MATERIALS 401(K) RETIREMENT PLAN

Plan id# Filing Submission Date Name of Administrator Date Administrator Signed Name of Company Sponsor Date Sponsor Signed
002 2024-01-01 BRANDON GIFFORD
002 2023-01-01
002 2023-01-01 BRIAN FRANTZ
002 2023-01-01 BRIAN FRANTZ
002 2022-01-01
002 2022-01-01 BRIAN FRANTZ
002 2021-01-01
002 2021-01-01
002 2021-01-01 BRIAN FRANTZ
002 2020-01-01
002 2019-01-01
002 2018-01-01
002 2017-01-01 BRIAN FRANTZ

Plan Statistics for SUMMIT MATERIALS 401(K) RETIREMENT PLAN

401k plan membership statisitcs for SUMMIT MATERIALS 401(K) RETIREMENT PLAN

Measure Date Value
2023: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2023 401k membership
Total participants, beginning-of-year 2023-01-01 6,122
Total number of active participants reported on line 7a of the Form 5500 2023-01-01 5,265
Number of retired or separated participants receiving benefits 2023-01-01 85
Number of other retired or separated participants entitled to future benefits 2023-01-01 1,486
Total of all active and inactive participants 2023-01-01 6,836
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2023-01-01 29
Total participants 2023-01-01 6,865
Number of participants with account balances 2023-01-01 6,223
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2023-01-01 11
2022: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2022 401k membership
Total participants, beginning-of-year 2022-01-01 6,961
Total number of active participants reported on line 7a of the Form 5500 2022-01-01 4,622
Number of retired or separated participants receiving benefits 2022-01-01 127
Number of other retired or separated participants entitled to future benefits 2022-01-01 1,373
Total of all active and inactive participants 2022-01-01 6,122
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2022-01-01 0
Total participants 2022-01-01 6,122
Number of participants with account balances 2022-01-01 5,792
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2022-01-01 722
2021: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2021 401k membership
Total participants, beginning-of-year 2021-01-01 6,934
Total number of active participants reported on line 7a of the Form 5500 2021-01-01 7,660
Number of retired or separated participants receiving benefits 2021-01-01 53
Number of other retired or separated participants entitled to future benefits 2021-01-01 764
Total of all active and inactive participants 2021-01-01 8,477
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2021-01-01 0
Total participants 2021-01-01 8,477
Number of participants with account balances 2021-01-01 5,370
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2021-01-01 46
2020: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2020 401k membership
Total participants, beginning-of-year 2020-01-01 7,999
Total number of active participants reported on line 7a of the Form 5500 2020-01-01 5,578
Number of retired or separated participants receiving benefits 2020-01-01 91
Number of other retired or separated participants entitled to future benefits 2020-01-01 974
Total of all active and inactive participants 2020-01-01 6,643
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2020-01-01 0
Total participants 2020-01-01 6,643
Number of participants with account balances 2020-01-01 5,314
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2020-01-01 417
2019: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2019 401k membership
Total participants, beginning-of-year 2019-01-01 7,603
Total number of active participants reported on line 7a of the Form 5500 2019-01-01 5,543
Number of retired or separated participants receiving benefits 2019-01-01 70
Number of other retired or separated participants entitled to future benefits 2019-01-01 2,283
Total of all active and inactive participants 2019-01-01 7,896
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2019-01-01 0
Total participants 2019-01-01 7,896
Number of participants with account balances 2019-01-01 6,489
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2019-01-01 292
2018: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2018 401k membership
Total participants, beginning-of-year 2018-01-01 7,285
Total number of active participants reported on line 7a of the Form 5500 2018-01-01 5,504
Number of retired or separated participants receiving benefits 2018-01-01 52
Number of other retired or separated participants entitled to future benefits 2018-01-01 1,971
Total of all active and inactive participants 2018-01-01 7,527
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2018-01-01 0
Total participants 2018-01-01 7,527
Number of participants with account balances 2018-01-01 5,957
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2018-01-01 298
2017: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2017 401k membership
Total participants, beginning-of-year 2017-01-01 6,228
Total number of active participants reported on line 7a of the Form 5500 2017-01-01 5,080
Number of retired or separated participants receiving benefits 2017-01-01 0
Number of other retired or separated participants entitled to future benefits 2017-01-01 1,923
Total of all active and inactive participants 2017-01-01 7,003
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2017-01-01 0
Total participants 2017-01-01 7,003
Number of participants with account balances 2017-01-01 4,993
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2017-01-01 0

Measure	Date	Value
2023: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2023 401k membership
Total participants, beginning-of-year	2023-01-01	6,122
Total number of active participants reported on line 7a of the Form 5500	2023-01-01	5,265
Number of retired or separated participants receiving benefits	2023-01-01	85
Number of other retired or separated participants entitled to future benefits	2023-01-01	1,486
Total of all active and inactive participants	2023-01-01	6,836
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2023-01-01	29
Total participants	2023-01-01	6,865
Number of participants with account balances	2023-01-01	6,223
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2023-01-01	11
2022: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2022 401k membership
Total participants, beginning-of-year	2022-01-01	6,961
Total number of active participants reported on line 7a of the Form 5500	2022-01-01	4,622
Number of retired or separated participants receiving benefits	2022-01-01	127
Number of other retired or separated participants entitled to future benefits	2022-01-01	1,373
Total of all active and inactive participants	2022-01-01	6,122
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2022-01-01	0
Total participants	2022-01-01	6,122
Number of participants with account balances	2022-01-01	5,792
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2022-01-01	722
2021: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2021 401k membership
Total participants, beginning-of-year	2021-01-01	6,934
Total number of active participants reported on line 7a of the Form 5500	2021-01-01	7,660
Number of retired or separated participants receiving benefits	2021-01-01	53
Number of other retired or separated participants entitled to future benefits	2021-01-01	764
Total of all active and inactive participants	2021-01-01	8,477
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2021-01-01	0
Total participants	2021-01-01	8,477
Number of participants with account balances	2021-01-01	5,370
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2021-01-01	46
2020: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2020 401k membership
Total participants, beginning-of-year	2020-01-01	7,999
Total number of active participants reported on line 7a of the Form 5500	2020-01-01	5,578
Number of retired or separated participants receiving benefits	2020-01-01	91
Number of other retired or separated participants entitled to future benefits	2020-01-01	974
Total of all active and inactive participants	2020-01-01	6,643
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2020-01-01	0
Total participants	2020-01-01	6,643
Number of participants with account balances	2020-01-01	5,314
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2020-01-01	417
2019: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2019 401k membership
Total participants, beginning-of-year	2019-01-01	7,603
Total number of active participants reported on line 7a of the Form 5500	2019-01-01	5,543
Number of retired or separated participants receiving benefits	2019-01-01	70
Number of other retired or separated participants entitled to future benefits	2019-01-01	2,283
Total of all active and inactive participants	2019-01-01	7,896
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2019-01-01	0
Total participants	2019-01-01	7,896
Number of participants with account balances	2019-01-01	6,489
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2019-01-01	292
2018: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2018 401k membership
Total participants, beginning-of-year	2018-01-01	7,285
Total number of active participants reported on line 7a of the Form 5500	2018-01-01	5,504
Number of retired or separated participants receiving benefits	2018-01-01	52
Number of other retired or separated participants entitled to future benefits	2018-01-01	1,971
Total of all active and inactive participants	2018-01-01	7,527
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2018-01-01	0
Total participants	2018-01-01	7,527
Number of participants with account balances	2018-01-01	5,957
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2018-01-01	298
2017: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2017 401k membership
Total participants, beginning-of-year	2017-01-01	6,228
Total number of active participants reported on line 7a of the Form 5500	2017-01-01	5,080
Number of retired or separated participants receiving benefits	2017-01-01	0
Number of other retired or separated participants entitled to future benefits	2017-01-01	1,923
Total of all active and inactive participants	2017-01-01	7,003
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2017-01-01	0
Total participants	2017-01-01	7,003
Number of participants with account balances	2017-01-01	4,993
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2017-01-01	0

Financial Data on SUMMIT MATERIALS 401(K) RETIREMENT PLAN

Measure	Date	Value
2023 : SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2023 401k financial data
Unrealized appreciation/depreciation of real estate assets	2023-12-31	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2023-12-31	$0
Total unrealized appreciation/depreciation of assets	2023-12-31	$0
Total transfer of assets to this plan	2023-12-31	$6,738,259
Total transfer of assets from this plan	2023-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2023-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2023-12-31	$0
Expenses. Interest paid	2023-12-31	$0
Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102	2023-12-31	$0
Total income from all sources (including contributions)	2023-12-31	$75,091,458
Total loss/gain on sale of assets	2023-12-31	$0
Total of all expenses incurred	2023-12-31	$34,894,389
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2023-12-31	$33,697,075
Expenses. Certain deemed distributions of participant loans	2023-12-31	$657,619
Value of total corrective distributions	2023-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2023-12-31	$35,641,998
Value of total assets at end of year	2023-12-31	$302,090,656
Value of total assets at beginning of year	2023-12-31	$255,155,328
Total of administrative expenses incurred including professional, contract, advisory and management fees	2023-12-31	$539,695
Total income from rents	2023-12-31	$0
Total interest from all sources	2023-12-31	$634,095
Total dividends received (eg from common stock, registered investment company shares)	2023-12-31	$8,170,421
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2023-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2023-12-31	$8,170,421
Assets. Real estate other than employer real property at end of year	2023-12-31	$0
Assets. Real estate other than employer real property at beginning of year	2023-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at end of year	2023-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2023-12-31	$0
Was this plan covered by a fidelity bond	2023-12-31	Yes
Value of fidelity bond cover	2023-12-31	$3,000,000
If this is an individual account plan, was there a blackout period	2023-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2023-12-31	No
Contributions received from participants	2023-12-31	$20,203,581
Participant contributions at end of year	2023-12-31	$5,969,021
Participant contributions at beginning of year	2023-12-31	$5,687,871
Participant contributions at end of year	2023-12-31	$0
Participant contributions at beginning of year	2023-12-31	$0
Assets. Other investments not covered elsewhere at end of year	2023-12-31	$215,957
Assets. Other investments not covered elsewhere at beginning of year	2023-12-31	$205,841
Income. Received or receivable in cash from other sources (including rollovers)	2023-12-31	$2,271,134
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2023-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2023-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2023-12-31	$0
Assets. Loans (other than to participants) at end of year	2023-12-31	$0
Assets. Loans (other than to participants) at beginning of year	2023-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2023-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2023-12-31	$0
Other income not declared elsewhere	2023-12-31	$30,194
Administrative expenses (other) incurred	2023-12-31	$0
Liabilities. Value of operating payables at end of year	2023-12-31	$0
Liabilities. Value of operating payables at beginning of year	2023-12-31	$0
Total non interest bearing cash at end of year	2023-12-31	$0
Total non interest bearing cash at beginning of year	2023-12-31	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2023-12-31	No
Income. Non cash contributions	2023-12-31	$0
Value of net income/loss	2023-12-31	$40,197,069
Value of net assets at end of year (total assets less liabilities)	2023-12-31	$302,090,656
Value of net assets at beginning of year (total assets less liabilities)	2023-12-31	$255,155,328
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2023-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2023-12-31	No
Were any leases to which the plan was party in default or uncollectible	2023-12-31	No
Assets. partnership/joint venture interests at end of year	2023-12-31	$0
Assets. partnership/joint venture interests at beginning of year	2023-12-31	$0
Investment advisory and management fees	2023-12-31	$250,038
Value of interest in registered invesment companies (eg mutual funds) at end of year	2023-12-31	$279,057,774
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2023-12-31	$234,277,880
Value of interest in pooled separate accounts at end of year	2023-12-31	$0
Value of interest in pooled separate accounts at beginning of year	2023-12-31	$0
Interest on participant loans	2023-12-31	$353,177
Income. Interest from loans (other than to participants)	2023-12-31	$0
Interest earned on other investments	2023-12-31	$280,918
Income. Interest from US Government securities	2023-12-31	$0
Income. Interest from corporate debt instruments	2023-12-31	$0
Value of interest in master investment trust accounts at end of year	2023-12-31	$0
Value of interest in master investment trust accounts at beginning of year	2023-12-31	$0
Value of interest in common/collective trusts at end of year	2023-12-31	$0
Value of interest in common/collective trusts at beginning of year	2023-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2023-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2023-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2023-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2023-12-31	$0
Assets. Value of investments in 103.12 investment entities at end of year	2023-12-31	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2023-12-31	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2023-12-31	$16,847,904
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2023-12-31	$14,983,736
Expenses. Payments to insurance carriers foe the provision of benefits	2023-12-31	$0
Asset value of US Government securities at end of year	2023-12-31	$0
Asset value of US Government securities at beginning of year	2023-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2023-12-31	$30,614,750
Net investment gain/loss from pooled separate accounts	2023-12-31	$0
Net investment gain or loss from common/collective trusts	2023-12-31	$0
Net gain/loss from 103.12 investment entities	2023-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2023-12-31	No
Was there a failure to transmit to the plan any participant contributions	2023-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2023-12-31	No
Assets. Invements in employer securities at end of year	2023-12-31	$0
Assets. Invements in employer securities at beginning of year	2023-12-31	$0
Assets. Value of employer real property at end of year	2023-12-31	$0
Assets. Value of employer real property at beginning of year	2023-12-31	$0
Contributions received in cash from employer	2023-12-31	$13,167,283
Employer contributions (assets) at end of year	2023-12-31	$0
Employer contributions (assets) at beginning of year	2023-12-31	$0
Income. Dividends from preferred stock	2023-12-31	$0
Income. Dividends from common stock	2023-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2023-12-31	$33,697,075
Asset. Corporate debt instrument preferred debt at end of year	2023-12-31	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2023-12-31	$0
Asset. Corporate debt instrument debt (other) at end of year	2023-12-31	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2023-12-31	$0
Contract administrator fees	2023-12-31	$0
Assets. Corporate common stocks other than exployer securities at end of year	2023-12-31	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2023-12-31	$0
Liabilities. Value of benefit claims payable at end of year	2023-12-31	$0
Liabilities. Value of benefit claims payable at beginning of year	2023-12-31	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2023-12-31	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2023-12-31	$0
Did the plan have assets held for investment	2023-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2023-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2023-12-31	No
Aggregate proceeds on sale of assets	2023-12-31	$0
Aggregate carrying amount (costs) on sale of assets	2023-12-31	$0
Liabilities. Value of acquisition indebtedness at end of year	2023-12-31	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2023-12-31	$0
Opinion of an independent qualified public accountant for this plan	2023-12-31	Unqualified
Accountancy firm name	2023-12-31	BDO USA, P.C.
Accountancy firm EIN	2023-12-31	135381590
Unrealized appreciation/depreciation of real estate assets	2023-01-01	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2023-01-01	$0
Total unrealized appreciation/depreciation of assets	2023-01-01	$0
Total transfer of assets to this plan	2023-01-01	$6,738,259
Total transfer of assets from this plan	2023-01-01	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2023-01-01	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2023-01-01	$0
Total income from all sources (including contributions)	2023-01-01	$75,091,458
Total loss/gain on sale of assets	2023-01-01	$0
Total of all expenses incurred	2023-01-01	$34,894,389
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2023-01-01	$33,697,075
Expenses. Certain deemed distributions of participant loans	2023-01-01	$657,619
Value of total corrective distributions	2023-01-01	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2023-01-01	$35,641,998
Value of total assets at end of year	2023-01-01	$302,090,656
Value of total assets at beginning of year	2023-01-01	$255,155,328
Total of administrative expenses incurred including professional, contract, advisory and management fees	2023-01-01	$539,695
Total income from rents	2023-01-01	$0
Total interest from all sources	2023-01-01	$634,095
Total dividends received (eg from common stock, registered investment company shares)	2023-01-01	$8,170,421
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2023-01-01	No
Total dividends received from registered investment company shares (eg mutual funds)	2023-01-01	$8,170,421
Assets. Real estate other than employer real property at end of year	2023-01-01	$0
Assets. Real estate other than employer real property at beginning of year	2023-01-01	$0
Assets. Corporate prefeered stocks other than exployer securities at end of year	2023-01-01	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2023-01-01	$0
Was this plan covered by a fidelity bond	2023-01-01	Yes
Value of fidelity bond cover	2023-01-01	$3,000,000
If this is an individual account plan, was there a blackout period	2023-01-01	No
Were there any nonexempt tranactions with any party-in-interest	2023-01-01	No
Contributions received from participants	2023-01-01	$20,203,581
Participant contributions at end of year	2023-01-01	$5,969,021
Participant contributions at beginning of year	2023-01-01	$5,687,871
Participant contributions at end of year	2023-01-01	$0
Participant contributions at beginning of year	2023-01-01	$0
Assets. Other investments not covered elsewhere at end of year	2023-01-01	$215,957
Assets. Other investments not covered elsewhere at beginning of year	2023-01-01	$205,841
Income. Received or receivable in cash from other sources (including rollovers)	2023-01-01	$2,271,134
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2023-01-01	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2023-01-01	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2023-01-01	$0
Assets. Loans (other than to participants) at end of year	2023-01-01	$0
Assets. Loans (other than to participants) at beginning of year	2023-01-01	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2023-01-01	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2023-01-01	$0
Other income not declared elsewhere	2023-01-01	$30,194
Administrative expenses (other) incurred	2023-01-01	$0
Liabilities. Value of operating payables at end of year	2023-01-01	$0
Liabilities. Value of operating payables at beginning of year	2023-01-01	$0
Total non interest bearing cash at end of year	2023-01-01	$0
Total non interest bearing cash at beginning of year	2023-01-01	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2023-01-01	No
Income. Non cash contributions	2023-01-01	$0
Value of net income/loss	2023-01-01	$40,197,069
Value of net assets at end of year (total assets less liabilities)	2023-01-01	$302,090,656
Value of net assets at beginning of year (total assets less liabilities)	2023-01-01	$255,155,328
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2023-01-01	No
Were any loans by the plan or fixed income obligations due to the plan in default	2023-01-01	No
Were any leases to which the plan was party in default or uncollectible	2023-01-01	No
Assets. partnership/joint venture interests at end of year	2023-01-01	$0
Assets. partnership/joint venture interests at beginning of year	2023-01-01	$0
Investment advisory and management fees	2023-01-01	$250,038
Value of interest in registered invesment companies (eg mutual funds) at end of year	2023-01-01	$279,057,774
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2023-01-01	$234,277,880
Value of interest in pooled separate accounts at end of year	2023-01-01	$0
Value of interest in pooled separate accounts at beginning of year	2023-01-01	$0
Interest on participant loans	2023-01-01	$353,177
Income. Interest from loans (other than to participants)	2023-01-01	$0
Interest earned on other investments	2023-01-01	$280,918
Income. Interest from US Government securities	2023-01-01	$0
Income. Interest from corporate debt instruments	2023-01-01	$0
Value of interest in master investment trust accounts at end of year	2023-01-01	$0
Value of interest in master investment trust accounts at beginning of year	2023-01-01	$0
Value of interest in common/collective trusts at end of year	2023-01-01	$0
Value of interest in common/collective trusts at beginning of year	2023-01-01	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2023-01-01	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2023-01-01	$0
Assets. Value of investments in 103.12 investment entities at end of year	2023-01-01	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2023-01-01	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2023-01-01	$16,847,904
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2023-01-01	$14,983,736
Expenses. Payments to insurance carriers foe the provision of benefits	2023-01-01	$0
Asset value of US Government securities at end of year	2023-01-01	$0
Asset value of US Government securities at beginning of year	2023-01-01	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2023-01-01	$30,614,750
Net investment gain/loss from pooled separate accounts	2023-01-01	$0
Net investment gain or loss from common/collective trusts	2023-01-01	$0
Net gain/loss from 103.12 investment entities	2023-01-01	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2023-01-01	No
Was there a failure to transmit to the plan any participant contributions	2023-01-01	Yes
Has the plan failed to provide any benefit when due under the plan	2023-01-01	No
Assets. Invements in employer securities at end of year	2023-01-01	$0
Assets. Invements in employer securities at beginning of year	2023-01-01	$0
Assets. Value of employer real property at end of year	2023-01-01	$0
Assets. Value of employer real property at beginning of year	2023-01-01	$0
Contributions received in cash from employer	2023-01-01	$13,167,283
Employer contributions (assets) at end of year	2023-01-01	$0
Employer contributions (assets) at beginning of year	2023-01-01	$0
Income. Dividends from preferred stock	2023-01-01	$0
Income. Dividends from common stock	2023-01-01	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2023-01-01	$33,697,075
Asset. Corporate debt instrument preferred debt at end of year	2023-01-01	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2023-01-01	$0
Asset. Corporate debt instrument debt (other) at end of year	2023-01-01	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2023-01-01	$0
Contract administrator fees	2023-01-01	$0
Assets. Corporate common stocks other than exployer securities at end of year	2023-01-01	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2023-01-01	$0
Liabilities. Value of benefit claims payable at end of year	2023-01-01	$0
Liabilities. Value of benefit claims payable at beginning of year	2023-01-01	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2023-01-01	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2023-01-01	$0
Did the plan have assets held for investment	2023-01-01	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2023-01-01	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2023-01-01	No
Aggregate proceeds on sale of assets	2023-01-01	$0
Aggregate carrying amount (costs) on sale of assets	2023-01-01	$0
Liabilities. Value of acquisition indebtedness at end of year	2023-01-01	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2023-01-01	$0
Opinion of an independent qualified public accountant for this plan	2023-01-01	1
Accountancy firm name	2023-01-01	BDO USA, P.C.
Accountancy firm EIN	2023-01-01	135381590
2022 : SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2022 401k financial data
Unrealized appreciation/depreciation of real estate assets	2022-12-31	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2022-12-31	$0
Total unrealized appreciation/depreciation of assets	2022-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2022-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2022-12-31	$0
Expenses. Interest paid	2022-12-31	$0
Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102	2022-12-31	$0
Total income from all sources (including contributions)	2022-12-31	$-16,613,636
Total loss/gain on sale of assets	2022-12-31	$0
Total of all expenses incurred	2022-12-31	$51,907,733
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2022-12-31	$51,143,428
Expenses. Certain deemed distributions of participant loans	2022-12-31	$229,596
Value of total corrective distributions	2022-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2022-12-31	$33,400,856
Value of total assets at end of year	2022-12-31	$255,155,328
Value of total assets at beginning of year	2022-12-31	$323,676,697
Total of administrative expenses incurred including professional, contract, advisory and management fees	2022-12-31	$534,709
Total income from rents	2022-12-31	$0
Total interest from all sources	2022-12-31	$523,350
Total dividends received (eg from common stock, registered investment company shares)	2022-12-31	$9,341,485
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2022-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2022-12-31	$9,341,485
Assets. Real estate other than employer real property at end of year	2022-12-31	$0
Assets. Real estate other than employer real property at beginning of year	2022-12-31	$0
Administrative expenses professional fees incurred	2022-12-31	$47,900
Assets. Corporate prefeered stocks other than exployer securities at end of year	2022-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2022-12-31	$0
Was this plan covered by a fidelity bond	2022-12-31	Yes
Value of fidelity bond cover	2022-12-31	$3,000,000
If this is an individual account plan, was there a blackout period	2022-12-31	No
Were there any nonexempt tranactions with any party-in-interest	2022-12-31	No
Contributions received from participants	2022-12-31	$19,107,696
Participant contributions at end of year	2022-12-31	$5,687,871
Participant contributions at beginning of year	2022-12-31	$5,216,157
Participant contributions at end of year	2022-12-31	$0
Participant contributions at beginning of year	2022-12-31	$0
Assets. Other investments not covered elsewhere at end of year	2022-12-31	$205,841
Assets. Other investments not covered elsewhere at beginning of year	2022-12-31	$116,906
Income. Received or receivable in cash from other sources (including rollovers)	2022-12-31	$2,335,933
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2022-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2022-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2022-12-31	$0
Assets. Loans (other than to participants) at end of year	2022-12-31	$0
Assets. Loans (other than to participants) at beginning of year	2022-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2022-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2022-12-31	$0
Other income not declared elsewhere	2022-12-31	$-53,920
Administrative expenses (other) incurred	2022-12-31	$0
Total non interest bearing cash at end of year	2022-12-31	$0
Total non interest bearing cash at beginning of year	2022-12-31	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-12-31	No
Income. Non cash contributions	2022-12-31	$0
Value of net income/loss	2022-12-31	$-68,521,369
Value of net assets at end of year (total assets less liabilities)	2022-12-31	$255,155,328
Value of net assets at beginning of year (total assets less liabilities)	2022-12-31	$323,676,697
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2022-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2022-12-31	No
Were any leases to which the plan was party in default or uncollectible	2022-12-31	No
Assets. partnership/joint venture interests at end of year	2022-12-31	$0
Assets. partnership/joint venture interests at beginning of year	2022-12-31	$0
Investment advisory and management fees	2022-12-31	$250,525
Value of interest in registered invesment companies (eg mutual funds) at end of year	2022-12-31	$234,277,880
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2022-12-31	$300,312,682
Interest on participant loans	2022-12-31	$248,898
Income. Interest from loans (other than to participants)	2022-12-31	$0
Interest earned on other investments	2022-12-31	$274,452
Income. Interest from US Government securities	2022-12-31	$0
Income. Interest from corporate debt instruments	2022-12-31	$0
Value of interest in master investment trust accounts at end of year	2022-12-31	$0
Value of interest in master investment trust accounts at beginning of year	2022-12-31	$0
Value of interest in common/collective trusts at end of year	2022-12-31	$0
Value of interest in common/collective trusts at beginning of year	2022-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2022-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2022-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2022-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2022-12-31	$0
Assets. Value of investments in 103.12 investment entities at end of year	2022-12-31	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2022-12-31	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2022-12-31	$14,983,736
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2022-12-31	$18,030,952
Expenses. Payments to insurance carriers foe the provision of benefits	2022-12-31	$0
Asset value of US Government securities at end of year	2022-12-31	$0
Asset value of US Government securities at beginning of year	2022-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2022-12-31	$-59,825,407
Net investment gain/loss from pooled separate accounts	2022-12-31	$0
Net investment gain or loss from common/collective trusts	2022-12-31	$0
Net gain/loss from 103.12 investment entities	2022-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2022-12-31	No
Was there a failure to transmit to the plan any participant contributions	2022-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2022-12-31	No
Assets. Invements in employer securities at end of year	2022-12-31	$0
Assets. Invements in employer securities at beginning of year	2022-12-31	$0
Assets. Value of employer real property at end of year	2022-12-31	$0
Assets. Value of employer real property at beginning of year	2022-12-31	$0
Contributions received in cash from employer	2022-12-31	$11,957,227
Employer contributions (assets) at end of year	2022-12-31	$0
Employer contributions (assets) at beginning of year	2022-12-31	$0
Income. Dividends from preferred stock	2022-12-31	$0
Income. Dividends from common stock	2022-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2022-12-31	$51,143,428
Asset. Corporate debt instrument preferred debt at end of year	2022-12-31	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2022-12-31	$0
Asset. Corporate debt instrument debt (other) at end of year	2022-12-31	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2022-12-31	$0
Contract administrator fees	2022-12-31	$236,284
Assets. Corporate common stocks other than exployer securities at end of year	2022-12-31	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2022-12-31	$0
Liabilities. Value of benefit claims payable at end of year	2022-12-31	$0
Liabilities. Value of benefit claims payable at beginning of year	2022-12-31	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2022-12-31	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2022-12-31	$0
Did the plan have assets held for investment	2022-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2022-12-31	No
Aggregate proceeds on sale of assets	2022-12-31	$0
Aggregate carrying amount (costs) on sale of assets	2022-12-31	$0
Liabilities. Value of acquisition indebtedness at end of year	2022-12-31	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2022-12-31	$0
Opinion of an independent qualified public accountant for this plan	2022-12-31	Unqualified
Accountancy firm name	2022-12-31	BDO USA, P.C.
Accountancy firm EIN	2022-12-31	135381590
Unrealized appreciation/depreciation of real estate assets	2022-01-01	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2022-01-01	$0
Total unrealized appreciation/depreciation of assets	2022-01-01	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2022-01-01	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2022-01-01	$0
Total income from all sources (including contributions)	2022-01-01	$-16,613,636
Total loss/gain on sale of assets	2022-01-01	$0
Total of all expenses incurred	2022-01-01	$51,907,733
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2022-01-01	$51,143,428
Expenses. Certain deemed distributions of participant loans	2022-01-01	$229,596
Value of total corrective distributions	2022-01-01	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2022-01-01	$33,400,856
Value of total assets at end of year	2022-01-01	$255,155,328
Value of total assets at beginning of year	2022-01-01	$323,676,697
Total of administrative expenses incurred including professional, contract, advisory and management fees	2022-01-01	$534,709
Total income from rents	2022-01-01	$0
Total interest from all sources	2022-01-01	$523,350
Total dividends received (eg from common stock, registered investment company shares)	2022-01-01	$9,341,485
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2022-01-01	No
Total dividends received from registered investment company shares (eg mutual funds)	2022-01-01	$9,341,485
Assets. Real estate other than employer real property at end of year	2022-01-01	$0
Assets. Real estate other than employer real property at beginning of year	2022-01-01	$0
Administrative expenses professional fees incurred	2022-01-01	$47,900
Assets. Corporate prefeered stocks other than exployer securities at end of year	2022-01-01	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2022-01-01	$0
Was this plan covered by a fidelity bond	2022-01-01	Yes
Value of fidelity bond cover	2022-01-01	$3,000,000
If this is an individual account plan, was there a blackout period	2022-01-01	No
Were there any nonexempt tranactions with any party-in-interest	2022-01-01	No
Contributions received from participants	2022-01-01	$19,107,696
Participant contributions at end of year	2022-01-01	$5,687,871
Participant contributions at beginning of year	2022-01-01	$5,216,157
Participant contributions at end of year	2022-01-01	$0
Participant contributions at beginning of year	2022-01-01	$0
Assets. Other investments not covered elsewhere at end of year	2022-01-01	$205,841
Assets. Other investments not covered elsewhere at beginning of year	2022-01-01	$116,906
Income. Received or receivable in cash from other sources (including rollovers)	2022-01-01	$2,335,933
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2022-01-01	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2022-01-01	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2022-01-01	$0
Assets. Loans (other than to participants) at end of year	2022-01-01	$0
Assets. Loans (other than to participants) at beginning of year	2022-01-01	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2022-01-01	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2022-01-01	$0
Other income not declared elsewhere	2022-01-01	$-53,920
Administrative expenses (other) incurred	2022-01-01	$0
Total non interest bearing cash at end of year	2022-01-01	$0
Total non interest bearing cash at beginning of year	2022-01-01	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-01-01	No
Income. Non cash contributions	2022-01-01	$0
Value of net income/loss	2022-01-01	$-68,521,369
Value of net assets at end of year (total assets less liabilities)	2022-01-01	$255,155,328
Value of net assets at beginning of year (total assets less liabilities)	2022-01-01	$323,676,697
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2022-01-01	No
Were any loans by the plan or fixed income obligations due to the plan in default	2022-01-01	No
Were any leases to which the plan was party in default or uncollectible	2022-01-01	No
Assets. partnership/joint venture interests at end of year	2022-01-01	$0
Assets. partnership/joint venture interests at beginning of year	2022-01-01	$0
Investment advisory and management fees	2022-01-01	$250,525
Value of interest in registered invesment companies (eg mutual funds) at end of year	2022-01-01	$234,277,880
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2022-01-01	$300,312,682
Interest on participant loans	2022-01-01	$248,898
Income. Interest from loans (other than to participants)	2022-01-01	$0
Interest earned on other investments	2022-01-01	$274,452
Income. Interest from US Government securities	2022-01-01	$0
Income. Interest from corporate debt instruments	2022-01-01	$0
Value of interest in master investment trust accounts at end of year	2022-01-01	$0
Value of interest in master investment trust accounts at beginning of year	2022-01-01	$0
Value of interest in common/collective trusts at end of year	2022-01-01	$0
Value of interest in common/collective trusts at beginning of year	2022-01-01	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2022-01-01	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2022-01-01	$0
Assets. Value of investments in 103.12 investment entities at end of year	2022-01-01	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2022-01-01	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2022-01-01	$14,983,736
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2022-01-01	$18,030,952
Expenses. Payments to insurance carriers foe the provision of benefits	2022-01-01	$0
Asset value of US Government securities at end of year	2022-01-01	$0
Asset value of US Government securities at beginning of year	2022-01-01	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2022-01-01	$-59,825,407
Net investment gain/loss from pooled separate accounts	2022-01-01	$0
Net investment gain or loss from common/collective trusts	2022-01-01	$0
Net gain/loss from 103.12 investment entities	2022-01-01	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2022-01-01	No
Was there a failure to transmit to the plan any participant contributions	2022-01-01	Yes
Has the plan failed to provide any benefit when due under the plan	2022-01-01	No
Assets. Invements in employer securities at end of year	2022-01-01	$0
Assets. Invements in employer securities at beginning of year	2022-01-01	$0
Assets. Value of employer real property at end of year	2022-01-01	$0
Assets. Value of employer real property at beginning of year	2022-01-01	$0
Contributions received in cash from employer	2022-01-01	$11,957,227
Employer contributions (assets) at end of year	2022-01-01	$0
Employer contributions (assets) at beginning of year	2022-01-01	$0
Income. Dividends from preferred stock	2022-01-01	$0
Income. Dividends from common stock	2022-01-01	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2022-01-01	$51,143,428
Asset. Corporate debt instrument preferred debt at end of year	2022-01-01	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2022-01-01	$0
Asset. Corporate debt instrument debt (other) at end of year	2022-01-01	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2022-01-01	$0
Contract administrator fees	2022-01-01	$236,284
Assets. Corporate common stocks other than exployer securities at end of year	2022-01-01	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2022-01-01	$0
Liabilities. Value of benefit claims payable at end of year	2022-01-01	$0
Liabilities. Value of benefit claims payable at beginning of year	2022-01-01	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2022-01-01	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2022-01-01	$0
Did the plan have assets held for investment	2022-01-01	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2022-01-01	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2022-01-01	No
Aggregate proceeds on sale of assets	2022-01-01	$0
Aggregate carrying amount (costs) on sale of assets	2022-01-01	$0
Liabilities. Value of acquisition indebtedness at end of year	2022-01-01	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2022-01-01	$0
Opinion of an independent qualified public accountant for this plan	2022-01-01	1
Accountancy firm name	2022-01-01	BDO USA, P.C.
Accountancy firm EIN	2022-01-01	135381590
2021 : SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2021 401k financial data
Unrealized appreciation/depreciation of real estate assets	2021-12-31	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2021-12-31	$0
Total unrealized appreciation/depreciation of assets	2021-12-31	$0
Total transfer of assets to this plan	2021-12-31	$4,503,586
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2021-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2021-12-31	$0
Expenses. Interest paid	2021-12-31	$0
Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102	2021-12-31	$0
Total income from all sources (including contributions)	2021-12-31	$73,303,877
Total loss/gain on sale of assets	2021-12-31	$0
Total of all expenses incurred	2021-12-31	$41,631,780
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2021-12-31	$40,913,279
Expenses. Certain deemed distributions of participant loans	2021-12-31	$274,829
Value of total corrective distributions	2021-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2021-12-31	$33,269,102
Value of total assets at end of year	2021-12-31	$323,676,697
Value of total assets at beginning of year	2021-12-31	$287,501,014
Total of administrative expenses incurred including professional, contract, advisory and management fees	2021-12-31	$443,672
Total income from rents	2021-12-31	$0
Total interest from all sources	2021-12-31	$576,315
Total dividends received (eg from common stock, registered investment company shares)	2021-12-31	$16,062,288
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2021-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2021-12-31	$16,062,288
Assets. Real estate other than employer real property at end of year	2021-12-31	$0
Assets. Real estate other than employer real property at beginning of year	2021-12-31	$0
Administrative expenses professional fees incurred	2021-12-31	$1,375
Assets. Corporate prefeered stocks other than exployer securities at end of year	2021-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2021-12-31	$0
Was this plan covered by a fidelity bond	2021-12-31	Yes
Value of fidelity bond cover	2021-12-31	$3,000,000
If this is an individual account plan, was there a blackout period	2021-12-31	Yes
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2021-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2021-12-31	No
Contributions received from participants	2021-12-31	$18,409,364
Participant contributions at end of year	2021-12-31	$5,216,157
Participant contributions at beginning of year	2021-12-31	$5,332,150
Participant contributions at end of year	2021-12-31	$0
Participant contributions at beginning of year	2021-12-31	$0
Assets. Other investments not covered elsewhere at end of year	2021-12-31	$116,906
Assets. Other investments not covered elsewhere at beginning of year	2021-12-31	$69,218
Income. Received or receivable in cash from other sources (including rollovers)	2021-12-31	$3,858,221
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2021-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2021-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2021-12-31	$0
Assets. Loans (other than to participants) at end of year	2021-12-31	$0
Assets. Loans (other than to participants) at beginning of year	2021-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2021-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2021-12-31	$0
Other income not declared elsewhere	2021-12-31	$18,301
Administrative expenses (other) incurred	2021-12-31	$0
Total non interest bearing cash at end of year	2021-12-31	$0
Total non interest bearing cash at beginning of year	2021-12-31	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2021-12-31	No
Income. Non cash contributions	2021-12-31	$0
Value of net income/loss	2021-12-31	$31,672,097
Value of net assets at end of year (total assets less liabilities)	2021-12-31	$323,676,697
Value of net assets at beginning of year (total assets less liabilities)	2021-12-31	$287,501,014
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2021-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2021-12-31	No
Were any leases to which the plan was party in default or uncollectible	2021-12-31	No
Assets. partnership/joint venture interests at end of year	2021-12-31	$0
Assets. partnership/joint venture interests at beginning of year	2021-12-31	$0
Investment advisory and management fees	2021-12-31	$186,385
Value of interest in registered invesment companies (eg mutual funds) at end of year	2021-12-31	$300,312,682
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2021-12-31	$262,369,112
Interest on participant loans	2021-12-31	$265,520
Income. Interest from loans (other than to participants)	2021-12-31	$0
Interest earned on other investments	2021-12-31	$310,795
Income. Interest from US Government securities	2021-12-31	$0
Income. Interest from corporate debt instruments	2021-12-31	$0
Value of interest in master investment trust accounts at end of year	2021-12-31	$0
Value of interest in master investment trust accounts at beginning of year	2021-12-31	$0
Value of interest in common/collective trusts at end of year	2021-12-31	$0
Value of interest in common/collective trusts at beginning of year	2021-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2021-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2021-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2021-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2021-12-31	$0
Assets. Value of investments in 103.12 investment entities at end of year	2021-12-31	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2021-12-31	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2021-12-31	$18,030,952
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2021-12-31	$19,730,534
Expenses. Payments to insurance carriers foe the provision of benefits	2021-12-31	$0
Asset value of US Government securities at end of year	2021-12-31	$0
Asset value of US Government securities at beginning of year	2021-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2021-12-31	$23,377,871
Net investment gain/loss from pooled separate accounts	2021-12-31	$0
Net investment gain or loss from common/collective trusts	2021-12-31	$0
Net gain/loss from 103.12 investment entities	2021-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2021-12-31	No
Was there a failure to transmit to the plan any participant contributions	2021-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2021-12-31	No
Assets. Invements in employer securities at end of year	2021-12-31	$0
Assets. Invements in employer securities at beginning of year	2021-12-31	$0
Assets. Value of employer real property at end of year	2021-12-31	$0
Assets. Value of employer real property at beginning of year	2021-12-31	$0
Contributions received in cash from employer	2021-12-31	$11,001,517
Employer contributions (assets) at end of year	2021-12-31	$0
Employer contributions (assets) at beginning of year	2021-12-31	$0
Income. Dividends from preferred stock	2021-12-31	$0
Income. Dividends from common stock	2021-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2021-12-31	$40,913,279
Asset. Corporate debt instrument preferred debt at end of year	2021-12-31	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2021-12-31	$0
Asset. Corporate debt instrument debt (other) at end of year	2021-12-31	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2021-12-31	$0
Contract administrator fees	2021-12-31	$255,912
Was the provided the required notice or one of the exceptions to providing the black out period notice applied under 29 CFR 2520.101-3	2021-12-31	Yes
Assets. Corporate common stocks other than exployer securities at end of year	2021-12-31	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2021-12-31	$0
Liabilities. Value of benefit claims payable at end of year	2021-12-31	$0
Liabilities. Value of benefit claims payable at beginning of year	2021-12-31	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2021-12-31	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2021-12-31	$0
Did the plan have assets held for investment	2021-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2021-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2021-12-31	No
Aggregate proceeds on sale of assets	2021-12-31	$0
Aggregate carrying amount (costs) on sale of assets	2021-12-31	$0
Liabilities. Value of acquisition indebtedness at end of year	2021-12-31	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2021-12-31	$0
Opinion of an independent qualified public accountant for this plan	2021-12-31	Unqualified
Accountancy firm name	2021-12-31	BDO USA, LLP
Accountancy firm EIN	2021-12-31	135381590
2020 : SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2020 401k financial data
Unrealized appreciation/depreciation of real estate assets	2020-12-31	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2020-12-31	$0
Total unrealized appreciation/depreciation of assets	2020-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2020-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2020-12-31	$0
Expenses. Interest paid	2020-12-31	$0
Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102	2020-12-31	$0
Total income from all sources (including contributions)	2020-12-31	$65,772,600
Total loss/gain on sale of assets	2020-12-31	$0
Total of all expenses incurred	2020-12-31	$31,377,622
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2020-12-31	$30,834,070
Expenses. Certain deemed distributions of participant loans	2020-12-31	$110,227
Value of total corrective distributions	2020-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2020-12-31	$29,348,283
Value of total assets at end of year	2020-12-31	$287,501,014
Value of total assets at beginning of year	2020-12-31	$253,106,036
Total of administrative expenses incurred including professional, contract, advisory and management fees	2020-12-31	$433,325
Total income from rents	2020-12-31	$0
Total interest from all sources	2020-12-31	$609,629
Total dividends received (eg from common stock, registered investment company shares)	2020-12-31	$9,919,985
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2020-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2020-12-31	$9,919,985
Assets. Real estate other than employer real property at end of year	2020-12-31	$0
Assets. Real estate other than employer real property at beginning of year	2020-12-31	$0
Administrative expenses professional fees incurred	2020-12-31	$23,600
Assets. Corporate prefeered stocks other than exployer securities at end of year	2020-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2020-12-31	$0
Was this plan covered by a fidelity bond	2020-12-31	Yes
Value of fidelity bond cover	2020-12-31	$3,000,000
If this is an individual account plan, was there a blackout period	2020-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2020-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2020-12-31	No
Contributions received from participants	2020-12-31	$17,267,016
Participant contributions at end of year	2020-12-31	$5,332,150
Participant contributions at beginning of year	2020-12-31	$5,549,105
Participant contributions at end of year	2020-12-31	$0
Participant contributions at beginning of year	2020-12-31	$0
Assets. Other investments not covered elsewhere at end of year	2020-12-31	$69,218
Assets. Other investments not covered elsewhere at beginning of year	2020-12-31	$25,849
Income. Received or receivable in cash from other sources (including rollovers)	2020-12-31	$1,235,199
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2020-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2020-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2020-12-31	$0
Assets. Loans (other than to participants) at end of year	2020-12-31	$0
Assets. Loans (other than to participants) at beginning of year	2020-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2020-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2020-12-31	$0
Other income not declared elsewhere	2020-12-31	$12,350
Administrative expenses (other) incurred	2020-12-31	$0
Total non interest bearing cash at end of year	2020-12-31	$0
Total non interest bearing cash at beginning of year	2020-12-31	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2020-12-31	No
Income. Non cash contributions	2020-12-31	$0
Value of net income/loss	2020-12-31	$34,394,978
Value of net assets at end of year (total assets less liabilities)	2020-12-31	$287,501,014
Value of net assets at beginning of year (total assets less liabilities)	2020-12-31	$253,106,036
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2020-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2020-12-31	No
Were any leases to which the plan was party in default or uncollectible	2020-12-31	No
Assets. partnership/joint venture interests at end of year	2020-12-31	$0
Assets. partnership/joint venture interests at beginning of year	2020-12-31	$0
Investment advisory and management fees	2020-12-31	$197,135
Value of interest in registered invesment companies (eg mutual funds) at end of year	2020-12-31	$262,369,112
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2020-12-31	$229,992,635
Interest on participant loans	2020-12-31	$290,526
Income. Interest from loans (other than to participants)	2020-12-31	$0
Interest earned on other investments	2020-12-31	$319,103
Income. Interest from US Government securities	2020-12-31	$0
Income. Interest from corporate debt instruments	2020-12-31	$0
Value of interest in master investment trust accounts at end of year	2020-12-31	$0
Value of interest in master investment trust accounts at beginning of year	2020-12-31	$0
Value of interest in common/collective trusts at end of year	2020-12-31	$0
Value of interest in common/collective trusts at beginning of year	2020-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2020-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2020-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2020-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2020-12-31	$0
Assets. Value of investments in 103.12 investment entities at end of year	2020-12-31	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2020-12-31	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2020-12-31	$19,730,534
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2020-12-31	$17,538,447
Expenses. Payments to insurance carriers foe the provision of benefits	2020-12-31	$0
Asset value of US Government securities at end of year	2020-12-31	$0
Asset value of US Government securities at beginning of year	2020-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2020-12-31	$25,882,353
Net investment gain/loss from pooled separate accounts	2020-12-31	$0
Net investment gain or loss from common/collective trusts	2020-12-31	$0
Net gain/loss from 103.12 investment entities	2020-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2020-12-31	No
Was there a failure to transmit to the plan any participant contributions	2020-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2020-12-31	No
Assets. Invements in employer securities at end of year	2020-12-31	$0
Assets. Invements in employer securities at beginning of year	2020-12-31	$0
Assets. Value of employer real property at end of year	2020-12-31	$0
Assets. Value of employer real property at beginning of year	2020-12-31	$0
Contributions received in cash from employer	2020-12-31	$10,846,068
Employer contributions (assets) at end of year	2020-12-31	$0
Employer contributions (assets) at beginning of year	2020-12-31	$0
Income. Dividends from preferred stock	2020-12-31	$0
Income. Dividends from common stock	2020-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2020-12-31	$30,834,070
Asset. Corporate debt instrument preferred debt at end of year	2020-12-31	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2020-12-31	$0
Asset. Corporate debt instrument debt (other) at end of year	2020-12-31	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2020-12-31	$0
Contract administrator fees	2020-12-31	$212,590
Assets. Corporate common stocks other than exployer securities at end of year	2020-12-31	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2020-12-31	$0
Liabilities. Value of benefit claims payable at end of year	2020-12-31	$0
Liabilities. Value of benefit claims payable at beginning of year	2020-12-31	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2020-12-31	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2020-12-31	$0
Did the plan have assets held for investment	2020-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2020-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2020-12-31	No
Aggregate proceeds on sale of assets	2020-12-31	$0
Aggregate carrying amount (costs) on sale of assets	2020-12-31	$0
Liabilities. Value of acquisition indebtedness at end of year	2020-12-31	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2020-12-31	$0
Opinion of an independent qualified public accountant for this plan	2020-12-31	Unqualified
Accountancy firm name	2020-12-31	BDO USA, LLP
Accountancy firm EIN	2020-12-31	135381590
2019 : SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2019 401k financial data
Unrealized appreciation/depreciation of real estate assets	2019-12-31	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2019-12-31	$0
Total unrealized appreciation/depreciation of assets	2019-12-31	$0
Total transfer of assets to this plan	2019-12-31	$4,960,456
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2019-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2019-12-31	$0
Expenses. Interest paid	2019-12-31	$0
Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102	2019-12-31	$0
Total income from all sources (including contributions)	2019-12-31	$69,968,695
Total loss/gain on sale of assets	2019-12-31	$0
Total of all expenses incurred	2019-12-31	$24,723,988
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2019-12-31	$24,076,371
Expenses. Certain deemed distributions of participant loans	2019-12-31	$202,712
Value of total corrective distributions	2019-12-31	$5,888
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2019-12-31	$27,171,752
Value of total assets at end of year	2019-12-31	$253,106,036
Value of total assets at beginning of year	2019-12-31	$202,900,873
Total of administrative expenses incurred including professional, contract, advisory and management fees	2019-12-31	$439,017
Total income from rents	2019-12-31	$0
Total interest from all sources	2019-12-31	$631,074
Total dividends received (eg from common stock, registered investment company shares)	2019-12-31	$8,235,301
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2019-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2019-12-31	$8,235,301
Assets. Real estate other than employer real property at end of year	2019-12-31	$0
Assets. Real estate other than employer real property at beginning of year	2019-12-31	$0
Administrative expenses professional fees incurred	2019-12-31	$25,699
Assets. Corporate prefeered stocks other than exployer securities at end of year	2019-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2019-12-31	$0
Was this plan covered by a fidelity bond	2019-12-31	Yes
Value of fidelity bond cover	2019-12-31	$3,000,000
If this is an individual account plan, was there a blackout period	2019-12-31	Yes
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2019-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2019-12-31	No
Contributions received from participants	2019-12-31	$15,818,068
Participant contributions at end of year	2019-12-31	$5,549,105
Participant contributions at beginning of year	2019-12-31	$4,759,147
Participant contributions at end of year	2019-12-31	$0
Participant contributions at beginning of year	2019-12-31	$0
Assets. Other investments not covered elsewhere at end of year	2019-12-31	$25,849
Assets. Other investments not covered elsewhere at beginning of year	2019-12-31	$7,526
Income. Received or receivable in cash from other sources (including rollovers)	2019-12-31	$1,271,695
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2019-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2019-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2019-12-31	$0
Assets. Loans (other than to participants) at end of year	2019-12-31	$0
Assets. Loans (other than to participants) at beginning of year	2019-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2019-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2019-12-31	$0
Other income not declared elsewhere	2019-12-31	$12,572
Administrative expenses (other) incurred	2019-12-31	$25
Total non interest bearing cash at end of year	2019-12-31	$0
Total non interest bearing cash at beginning of year	2019-12-31	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2019-12-31	No
Income. Non cash contributions	2019-12-31	$0
Value of net income/loss	2019-12-31	$45,244,707
Value of net assets at end of year (total assets less liabilities)	2019-12-31	$253,106,036
Value of net assets at beginning of year (total assets less liabilities)	2019-12-31	$202,900,873
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2019-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2019-12-31	No
Were any leases to which the plan was party in default or uncollectible	2019-12-31	No
Assets. partnership/joint venture interests at end of year	2019-12-31	$0
Assets. partnership/joint venture interests at beginning of year	2019-12-31	$0
Investment advisory and management fees	2019-12-31	$167,293
Value of interest in registered invesment companies (eg mutual funds) at end of year	2019-12-31	$229,992,635
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2019-12-31	$177,349,485
Interest on participant loans	2019-12-31	$270,882
Income. Interest from loans (other than to participants)	2019-12-31	$0
Interest earned on other investments	2019-12-31	$360,192
Income. Interest from US Government securities	2019-12-31	$0
Income. Interest from corporate debt instruments	2019-12-31	$0
Value of interest in master investment trust accounts at end of year	2019-12-31	$0
Value of interest in master investment trust accounts at beginning of year	2019-12-31	$0
Value of interest in common/collective trusts at end of year	2019-12-31	$0
Value of interest in common/collective trusts at beginning of year	2019-12-31	$1,038,362
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2019-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2019-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2019-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2019-12-31	$0
Assets. Value of investments in 103.12 investment entities at end of year	2019-12-31	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2019-12-31	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2019-12-31	$17,538,447
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2019-12-31	$19,746,353
Expenses. Payments to insurance carriers foe the provision of benefits	2019-12-31	$0
Asset value of US Government securities at end of year	2019-12-31	$0
Asset value of US Government securities at beginning of year	2019-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2019-12-31	$33,907,313
Net investment gain/loss from pooled separate accounts	2019-12-31	$0
Net investment gain or loss from common/collective trusts	2019-12-31	$10,683
Net gain/loss from 103.12 investment entities	2019-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2019-12-31	No
Was there a failure to transmit to the plan any participant contributions	2019-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2019-12-31	No
Assets. Invements in employer securities at end of year	2019-12-31	$0
Assets. Invements in employer securities at beginning of year	2019-12-31	$0
Assets. Value of employer real property at end of year	2019-12-31	$0
Assets. Value of employer real property at beginning of year	2019-12-31	$0
Contributions received in cash from employer	2019-12-31	$10,081,989
Employer contributions (assets) at end of year	2019-12-31	$0
Employer contributions (assets) at beginning of year	2019-12-31	$0
Income. Dividends from preferred stock	2019-12-31	$0
Income. Dividends from common stock	2019-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2019-12-31	$24,076,371
Asset. Corporate debt instrument preferred debt at end of year	2019-12-31	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2019-12-31	$0
Asset. Corporate debt instrument debt (other) at end of year	2019-12-31	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2019-12-31	$0
Contract administrator fees	2019-12-31	$246,000
Was the provided the required notice or one of the exceptions to providing the black out period notice applied under 29 CFR 2520.101-3	2019-12-31	Yes
Assets. Corporate common stocks other than exployer securities at end of year	2019-12-31	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2019-12-31	$0
Liabilities. Value of benefit claims payable at end of year	2019-12-31	$0
Liabilities. Value of benefit claims payable at beginning of year	2019-12-31	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2019-12-31	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2019-12-31	$0
Did the plan have assets held for investment	2019-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2019-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2019-12-31	No
Aggregate proceeds on sale of assets	2019-12-31	$0
Aggregate carrying amount (costs) on sale of assets	2019-12-31	$0
Liabilities. Value of acquisition indebtedness at end of year	2019-12-31	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2019-12-31	$0
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2019-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2019-12-31	Disclaimer
Accountancy firm name	2019-12-31	ACM LLP
Accountancy firm EIN	2019-12-31	010724563
2018 : SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2018 401k financial data
Unrealized appreciation/depreciation of real estate assets	2018-12-31	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2018-12-31	$0
Total unrealized appreciation/depreciation of assets	2018-12-31	$0
Total transfer of assets to this plan	2018-12-31	$19,313,347
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2018-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2018-12-31	$0
Expenses. Interest paid	2018-12-31	$0
Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102	2018-12-31	$0
Total income from all sources (including contributions)	2018-12-31	$15,925,320
Total loss/gain on sale of assets	2018-12-31	$0
Total of all expenses incurred	2018-12-31	$24,576,825
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2018-12-31	$23,846,076
Expenses. Certain deemed distributions of participant loans	2018-12-31	$339,457
Value of total corrective distributions	2018-12-31	$4,982
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2018-12-31	$27,132,939
Value of total assets at end of year	2018-12-31	$202,900,873
Value of total assets at beginning of year	2018-12-31	$192,239,031
Total of administrative expenses incurred including professional, contract, advisory and management fees	2018-12-31	$386,310
Total income from rents	2018-12-31	$0
Total interest from all sources	2018-12-31	$574,244
Total dividends received (eg from common stock, registered investment company shares)	2018-12-31	$7,972,342
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2018-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2018-12-31	$7,972,342
Assets. Real estate other than employer real property at end of year	2018-12-31	$0
Assets. Real estate other than employer real property at beginning of year	2018-12-31	$0
Administrative expenses professional fees incurred	2018-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at end of year	2018-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2018-12-31	$0
Was this plan covered by a fidelity bond	2018-12-31	Yes
Value of fidelity bond cover	2018-12-31	$3,000,000
If this is an individual account plan, was there a blackout period	2018-12-31	Yes
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2018-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2018-12-31	No
Contributions received from participants	2018-12-31	$14,274,033
Participant contributions at end of year	2018-12-31	$4,759,147
Participant contributions at beginning of year	2018-12-31	$4,456,441
Participant contributions at end of year	2018-12-31	$0
Participant contributions at beginning of year	2018-12-31	$0
Assets. Other investments not covered elsewhere at end of year	2018-12-31	$7,526
Assets. Other investments not covered elsewhere at beginning of year	2018-12-31	$79,365
Income. Received or receivable in cash from other sources (including rollovers)	2018-12-31	$3,515,012
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2018-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2018-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2018-12-31	$0
Assets. Loans (other than to participants) at end of year	2018-12-31	$0
Assets. Loans (other than to participants) at beginning of year	2018-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2018-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2018-12-31	$0
Other income not declared elsewhere	2018-12-31	$-5,127
Administrative expenses (other) incurred	2018-12-31	$0
Total non interest bearing cash at end of year	2018-12-31	$0
Total non interest bearing cash at beginning of year	2018-12-31	$0
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2018-12-31	No
Income. Non cash contributions	2018-12-31	$0
Value of net income/loss	2018-12-31	$-8,651,505
Value of net assets at end of year (total assets less liabilities)	2018-12-31	$202,900,873
Value of net assets at beginning of year (total assets less liabilities)	2018-12-31	$192,239,031
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2018-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2018-12-31	No
Were any leases to which the plan was party in default or uncollectible	2018-12-31	No
Assets. partnership/joint venture interests at end of year	2018-12-31	$0
Assets. partnership/joint venture interests at beginning of year	2018-12-31	$0
Investment advisory and management fees	2018-12-31	$24,250
Value of interest in registered invesment companies (eg mutual funds) at end of year	2018-12-31	$177,349,485
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2018-12-31	$167,858,266
Interest on participant loans	2018-12-31	$211,950
Income. Interest from loans (other than to participants)	2018-12-31	$0
Interest earned on other investments	2018-12-31	$362,294
Income. Interest from US Government securities	2018-12-31	$0
Income. Interest from corporate debt instruments	2018-12-31	$0
Value of interest in master investment trust accounts at end of year	2018-12-31	$0
Value of interest in master investment trust accounts at beginning of year	2018-12-31	$0
Value of interest in common/collective trusts at end of year	2018-12-31	$1,038,362
Value of interest in common/collective trusts at beginning of year	2018-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2018-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2018-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2018-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2018-12-31	$0
Assets. Value of investments in 103.12 investment entities at end of year	2018-12-31	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2018-12-31	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2018-12-31	$19,746,353
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2018-12-31	$19,844,959
Expenses. Payments to insurance carriers foe the provision of benefits	2018-12-31	$0
Asset value of US Government securities at end of year	2018-12-31	$0
Asset value of US Government securities at beginning of year	2018-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2018-12-31	$-19,758,548
Net investment gain/loss from pooled separate accounts	2018-12-31	$0
Net investment gain or loss from common/collective trusts	2018-12-31	$9,470
Net gain/loss from 103.12 investment entities	2018-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2018-12-31	No
Was there a failure to transmit to the plan any participant contributions	2018-12-31	No
Has the plan failed to provide any benefit when due under the plan	2018-12-31	No
Assets. Invements in employer securities at end of year	2018-12-31	$0
Assets. Invements in employer securities at beginning of year	2018-12-31	$0
Assets. Value of employer real property at end of year	2018-12-31	$0
Assets. Value of employer real property at beginning of year	2018-12-31	$0
Contributions received in cash from employer	2018-12-31	$9,343,894
Employer contributions (assets) at end of year	2018-12-31	$0
Employer contributions (assets) at beginning of year	2018-12-31	$0
Income. Dividends from preferred stock	2018-12-31	$0
Income. Dividends from common stock	2018-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2018-12-31	$23,846,076
Asset. Corporate debt instrument preferred debt at end of year	2018-12-31	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2018-12-31	$0
Asset. Corporate debt instrument debt (other) at end of year	2018-12-31	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2018-12-31	$0
Contract administrator fees	2018-12-31	$362,060
Was the provided the required notice or one of the exceptions to providing the black out period notice applied under 29 CFR 2520.101-3	2018-12-31	Yes
Assets. Corporate common stocks other than exployer securities at end of year	2018-12-31	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2018-12-31	$0
Liabilities. Value of benefit claims payable at end of year	2018-12-31	$0
Liabilities. Value of benefit claims payable at beginning of year	2018-12-31	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2018-12-31	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2018-12-31	$0
Did the plan have assets held for investment	2018-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2018-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2018-12-31	No
Aggregate proceeds on sale of assets	2018-12-31	$0
Aggregate carrying amount (costs) on sale of assets	2018-12-31	$0
Liabilities. Value of acquisition indebtedness at end of year	2018-12-31	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2018-12-31	$0
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2018-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2018-12-31	Disclaimer
Accountancy firm name	2018-12-31	ACM LLP
Accountancy firm EIN	2018-12-31	010724563
2017 : SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2017 401k financial data
Unrealized appreciation/depreciation of real estate assets	2017-12-31	$0
Unrealized appreciation/depreciation of other (non real estate) assets	2017-12-31	$0
Total unrealized appreciation/depreciation of assets	2017-12-31	$0
Total transfer of assets to this plan	2017-12-31	$4,193,264
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-12-31	$0
Expenses. Interest paid	2017-12-31	$0
Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102	2017-12-31	$0
Total income from all sources (including contributions)	2017-12-31	$47,385,312
Total loss/gain on sale of assets	2017-12-31	$0
Total of all expenses incurred	2017-12-31	$14,159,330
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2017-12-31	$13,758,300
Expenses. Certain deemed distributions of participant loans	2017-12-31	$97,234
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2017-12-31	$22,445,523
Value of total assets at end of year	2017-12-31	$192,239,031
Value of total assets at beginning of year	2017-12-31	$154,819,785
Total of administrative expenses incurred including professional, contract, advisory and management fees	2017-12-31	$303,796
Total income from rents	2017-12-31	$0
Total interest from all sources	2017-12-31	$518,525
Total dividends received (eg from common stock, registered investment company shares)	2017-12-31	$5,688,789
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2017-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2017-12-31	$5,688,789
Assets. Real estate other than employer real property at end of year	2017-12-31	$0
Assets. Real estate other than employer real property at beginning of year	2017-12-31	$0
Administrative expenses professional fees incurred	2017-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at end of year	2017-12-31	$0
Assets. Corporate prefeered stocks other than exployer securities at beginning of year	2017-12-31	$0
Was this plan covered by a fidelity bond	2017-12-31	Yes
Value of fidelity bond cover	2017-12-31	$3,000,000
If this is an individual account plan, was there a blackout period	2017-12-31	Yes
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2017-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2017-12-31	No
Contributions received from participants	2017-12-31	$11,919,104
Participant contributions at end of year	2017-12-31	$4,456,441
Participant contributions at beginning of year	2017-12-31	$3,719,717
Participant contributions at end of year	2017-12-31	$0
Participant contributions at beginning of year	2017-12-31	$0
Assets. Other investments not covered elsewhere at end of year	2017-12-31	$79,365
Assets. Other investments not covered elsewhere at beginning of year	2017-12-31	$89,237
Income. Received or receivable in cash from other sources (including rollovers)	2017-12-31	$2,422,591
Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries)	2017-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at end of year	2017-12-31	$0
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2017-12-31	$0
Assets. Loans (other than to participants) at end of year	2017-12-31	$0
Assets. Loans (other than to participants) at beginning of year	2017-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2017-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2017-12-31	$0
Other income not declared elsewhere	2017-12-31	$14,175
Administrative expenses (other) incurred	2017-12-31	$0
Total non interest bearing cash at end of year	2017-12-31	$0
Total non interest bearing cash at beginning of year	2017-12-31	$440
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-12-31	No
Income. Non cash contributions	2017-12-31	$0
Value of net income/loss	2017-12-31	$33,225,982
Value of net assets at end of year (total assets less liabilities)	2017-12-31	$192,239,031
Value of net assets at beginning of year (total assets less liabilities)	2017-12-31	$154,819,785
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2017-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2017-12-31	No
Were any leases to which the plan was party in default or uncollectible	2017-12-31	No
Assets. partnership/joint venture interests at end of year	2017-12-31	$0
Assets. partnership/joint venture interests at beginning of year	2017-12-31	$0
Investment advisory and management fees	2017-12-31	$120,795
Value of interest in registered invesment companies (eg mutual funds) at end of year	2017-12-31	$167,858,266
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2017-12-31	$129,221,060
Interest on participant loans	2017-12-31	$188,492
Income. Interest from loans (other than to participants)	2017-12-31	$0
Interest earned on other investments	2017-12-31	$330,033
Income. Interest from US Government securities	2017-12-31	$0
Income. Interest from corporate debt instruments	2017-12-31	$0
Value of interest in master investment trust accounts at end of year	2017-12-31	$0
Value of interest in master investment trust accounts at beginning of year	2017-12-31	$0
Value of interest in common/collective trusts at end of year	2017-12-31	$0
Value of interest in common/collective trusts at beginning of year	2017-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2017-12-31	$0
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2017-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2017-12-31	$0
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2017-12-31	$0
Assets. Value of investments in 103.12 investment entities at end of year	2017-12-31	$0
Assets. Value of investments in 103.12 investment entities at beginning of year	2017-12-31	$0
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2017-12-31	$19,844,959
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2017-12-31	$21,789,331
Expenses. Payments to insurance carriers foe the provision of benefits	2017-12-31	$0
Asset value of US Government securities at end of year	2017-12-31	$0
Asset value of US Government securities at beginning of year	2017-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2017-12-31	$18,718,300
Net investment gain/loss from pooled separate accounts	2017-12-31	$0
Net investment gain or loss from common/collective trusts	2017-12-31	$0
Net gain/loss from 103.12 investment entities	2017-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2017-12-31	No
Was there a failure to transmit to the plan any participant contributions	2017-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2017-12-31	No
Assets. Invements in employer securities at end of year	2017-12-31	$0
Assets. Invements in employer securities at beginning of year	2017-12-31	$0
Assets. Value of employer real property at end of year	2017-12-31	$0
Assets. Value of employer real property at beginning of year	2017-12-31	$0
Contributions received in cash from employer	2017-12-31	$8,103,828
Employer contributions (assets) at end of year	2017-12-31	$0
Employer contributions (assets) at beginning of year	2017-12-31	$0
Income. Dividends from preferred stock	2017-12-31	$0
Income. Dividends from common stock	2017-12-31	$0
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2017-12-31	$13,758,300
Asset. Corporate debt instrument preferred debt at end of year	2017-12-31	$0
Asset. Corporate debt instrument preferred debt at beginning of year	2017-12-31	$0
Asset. Corporate debt instrument debt (other) at end of year	2017-12-31	$0
Asset. Corporate debt instrument debt (other) at beginning of year	2017-12-31	$0
Contract administrator fees	2017-12-31	$183,001
Was the provided the required notice or one of the exceptions to providing the black out period notice applied under 29 CFR 2520.101-3	2017-12-31	Yes
Assets. Corporate common stocks other than exployer securities at end of year	2017-12-31	$0
Assets. Corporate common stocks other than exployer securities at beginning of year	2017-12-31	$0
Liabilities. Value of benefit claims payable at end of year	2017-12-31	$0
Liabilities. Value of benefit claims payable at beginning of year	2017-12-31	$0
Assets. Value of buildings and other operty used in plan operation at end of year	2017-12-31	$0
Assets. Value of buildings and other operty used in plan operation at beginning of year	2017-12-31	$0
Did the plan have assets held for investment	2017-12-31	Yes
Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser	2017-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2017-12-31	No
Aggregate proceeds on sale of assets	2017-12-31	$0
Aggregate carrying amount (costs) on sale of assets	2017-12-31	$0
Liabilities. Value of acquisition indebtedness at end of year	2017-12-31	$0
Liabilities. Value of acquisition indebtedness at beginning of year	2017-12-31	$0
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2017-12-31	Yes
Opinion of an independent qualified public accountant for this plan	2017-12-31	Disclaimer
Accountancy firm name	2017-12-31	EKS&H, LLLP
Accountancy firm EIN	2017-12-31	461497033

Form 5500 Responses for SUMMIT MATERIALS 401(K) RETIREMENT PLAN

2023: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2023 form 5500 responses
2023-01-01	Type of plan entity	Single employer plan
2023-01-01	Submission has been amended	Yes
2023-01-01	This submission is the final filing	No
2023-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2023-01-01	Plan is a collectively bargained plan	No
2023-01-01	Plan funding arrangement – Insurance	Yes
2023-01-01	Plan funding arrangement – Trust	Yes
2023-01-01	Plan benefit arrangement – Insurance	Yes
2023-01-01	Plan benefit arrangement - Trust	Yes
2022: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2022 form 5500 responses
2022-01-01	Type of plan entity	Single employer plan
2022-01-01	Submission has been amended	No
2022-01-01	This submission is the final filing	No
2022-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2022-01-01	Plan is a collectively bargained plan	No
2022-01-01	Plan funding arrangement – Insurance	Yes
2022-01-01	Plan funding arrangement – Trust	Yes
2022-01-01	Plan benefit arrangement – Insurance	Yes
2022-01-01	Plan benefit arrangement - Trust	Yes
2021: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2021 form 5500 responses
2021-01-01	Type of plan entity	Single employer plan
2021-01-01	Submission has been amended	No
2021-01-01	This submission is the final filing	No
2021-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2021-01-01	Plan is a collectively bargained plan	No
2021-01-01	Plan funding arrangement – Insurance	Yes
2021-01-01	Plan funding arrangement – Trust	Yes
2021-01-01	Plan benefit arrangement – Insurance	Yes
2021-01-01	Plan benefit arrangement - Trust	Yes
2020: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2020 form 5500 responses
2020-01-01	Type of plan entity	Single employer plan
2020-01-01	Submission has been amended	No
2020-01-01	This submission is the final filing	No
2020-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2020-01-01	Plan is a collectively bargained plan	No
2020-01-01	Plan funding arrangement – Insurance	Yes
2020-01-01	Plan funding arrangement – Trust	Yes
2020-01-01	Plan benefit arrangement – Insurance	Yes
2020-01-01	Plan benefit arrangement - Trust	Yes
2019: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2019 form 5500 responses
2019-01-01	Type of plan entity	Single employer plan
2019-01-01	Submission has been amended	No
2019-01-01	This submission is the final filing	No
2019-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2019-01-01	Plan is a collectively bargained plan	No
2019-01-01	Plan funding arrangement – Insurance	Yes
2019-01-01	Plan funding arrangement – Trust	Yes
2019-01-01	Plan benefit arrangement – Insurance	Yes
2019-01-01	Plan benefit arrangement - Trust	Yes
2018: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2018 form 5500 responses
2018-01-01	Type of plan entity	Single employer plan
2018-01-01	Submission has been amended	No
2018-01-01	This submission is the final filing	No
2018-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2018-01-01	Plan is a collectively bargained plan	No
2018-01-01	Plan funding arrangement – Insurance	Yes
2018-01-01	Plan funding arrangement – Trust	Yes
2018-01-01	Plan benefit arrangement – Insurance	Yes
2018-01-01	Plan benefit arrangement - Trust	Yes
2017: SUMMIT MATERIALS 401(K) RETIREMENT PLAN 2017 form 5500 responses
2017-01-01	Type of plan entity	Single employer plan
2017-01-01	Submission has been amended	No
2017-01-01	This submission is the final filing	No
2017-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2017-01-01	Plan is a collectively bargained plan	No
2017-01-01	Plan funding arrangement – Insurance	Yes
2017-01-01	Plan funding arrangement – Trust	Yes
2017-01-01	Plan benefit arrangement – Insurance	Yes
2017-01-01	Plan benefit arrangement - Trust	Yes

Insurance Providers Used on plan

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 68322 )

Policy contract number

385089-01

Policy instance

Insurance contract or identification number	385089-01
Number of Individuals Covered	1368
Insurance policy start date	2023-01-01
Insurance policy end date	2023-12-31
Are there contracts with allocated funds for individual policies?	0
Are there contracts with allocated funds for group deferred annuity?	No
Are there contracts with allocated funds for types other than group deferred annuity or individual?	No
Contract purchased, in whole or in part, to distribute benefits from a terminating plan	No
Contracts With Unallocated Funds Deposit Administration	0
Are there contracts with unallocated funds for contracts of type immediate participation guarantee?	No
Are there contracts with unallocated funds for contracts of type guaranteed investment?	No
Are there contracts with unallocated funds for contract types other than deposit administration, immediate participation guarantee or guaranteed investment?	Yes
Health Insurance Welfare Benefit	No
Dental Insurance Welfare Benefit	No
Vision Insurance Welfare Benefit	No
Life Insurance Welfare Benefit	No
Temporary Disability Insurance Welfare Benefit	No
Long Term Disability Insurance Welfare Benefit	No
Unemployment Insurance Welfare Benefit	No
Were dividends or retroactive rate refunds paid in cash?	No
Were dividends or retroactive rate refunds paid as a credit?	No
Did the insurance company fail to provide any information necessary to complete Schedule A of form 5500?	No

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 68322 )

Policy contract number

385089-01

Policy instance

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 68322 )

Policy contract number

385089-01

Policy instance

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 68322 )

Policy contract number

385089-01

Policy instance

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 68322 )

Policy contract number

385089-01

Policy instance

GREAT-WEST LIFE & ANNUITY INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 68322 )

Policy contract number

385089-01

Policy instance

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Company Name:	SUMMIT MATERIALS, LLC.
Employer identification number (EIN):	264138486
NAIC Classification:	237310
NAIC Description:	Highway, Street, and Bridge Construction

Plan id#	Filing Submission Date	Name of Administrator
002	2024-01-01	BRANDON GIFFORD
002	2023-01-01
002	2023-01-01	BRIAN FRANTZ
002	2023-01-01	BRIAN FRANTZ
002	2022-01-01
002	2022-01-01	BRIAN FRANTZ
002	2021-01-01
002	2021-01-01
002	2021-01-01	BRIAN FRANTZ
002	2020-01-01
002	2019-01-01
002	2018-01-01
002	2017-01-01	BRIAN FRANTZ