401k Plan data: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN plan

MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 401k Plan overview

Plan Name	MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN
Plan identification number	004

MDU RESOURCES GROUP, INC. 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.
ESOP other than a leveraged ESOP - A completed Schedule E must be attached to a Form 5500 filed for an Employee Stock Ownership Plan (ESOP).
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.
Plan sponsor(s) is (are) a member(s) of a controlled group (Code sections 414(b), (c), or (m)).

401k Sponsoring company profile

MDU RESOURCES GROUP, INC. has sponsored the creation of one or more 401k plans.

Company Name: MDU RESOURCES GROUP, INC.

Employer identification number (EIN): 410423660

NAIC Classification: 221100

Additional information about MDU RESOURCES GROUP, INC.

Jurisdiction of Incorporation: Texas Secretary of State

Incorporation Date: 2017-06-12

Company Identification Number: 0802743739

Legal Registered Office Address: PO BOX 5650

BISMARCK
United States of America (USA)
58506

More information about MDU RESOURCES GROUP, INC.

Form 5500 Filing Information

Submission information for form 5500 for 401k plan MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN

Plan id# Filing Submission Date Name of Administrator Date Administrator Signed Name of Company Sponsor Date Sponsor Signed
004 2018-01-01 JASON VOLLMER
004 2017-01-01 JASON VOLLMER
004 2016-01-01 DORAN N. SCHWARTZ
004 2016-01-01 JASON VOLLMER
004 2015-01-01 DORAN N. SCHWARTZ
004 2015-01-01 JASON VOLLMER
004 2014-01-01 DORAN N. SCHWARTZ
004 2013-01-01 DORAN SCHWARTZ
004 2012-01-01 DORAN SCHWARTZ
004 2011-01-01 DORAN N. SCHWARTZ
004 2010-01-01 DORAN N. SCHWARTZ DORAN N. SCHWARTZ 2011-07-06
004 2009-01-01 DORAN N. SCHWARTZ DORAN N. SCHWARTZ 2010-06-28
004 2009-01-01 DORAN N. SCHWARTZ DORAN N. SCHWARTZ 2010-06-28

Plan id#	Filing Submission Date	Name of Administrator	Name of Company Sponsor	Date Sponsor Signed
004	2018-01-01	JASON VOLLMER
004	2017-01-01	JASON VOLLMER
004	2016-01-01	DORAN N. SCHWARTZ
004	2016-01-01	JASON VOLLMER
004	2015-01-01	DORAN N. SCHWARTZ
004	2015-01-01	JASON VOLLMER
004	2014-01-01	DORAN N. SCHWARTZ
004	2013-01-01	DORAN SCHWARTZ
004	2012-01-01	DORAN SCHWARTZ
004	2011-01-01	DORAN N. SCHWARTZ
004	2010-01-01	DORAN N. SCHWARTZ	DORAN N. SCHWARTZ	2011-07-06
004	2009-01-01	DORAN N. SCHWARTZ	DORAN N. SCHWARTZ	2010-06-28
004	2009-01-01	DORAN N. SCHWARTZ	DORAN N. SCHWARTZ	2010-06-28

Plan Statistics for MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN

401k plan membership statisitcs for MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN

Measure Date Value
2018: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2018 401k membership
Total participants, beginning-of-year 2018-01-01 12,050
Total number of active participants reported on line 7a of the Form 5500 2018-01-01 8,076
Number of retired or separated participants receiving benefits 2018-01-01 0
Number of other retired or separated participants entitled to future benefits 2018-01-01 4,993
Total of all active and inactive participants 2018-01-01 13,069
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2018-01-01 95
Total participants 2018-01-01 13,164
Number of participants with account balances 2018-01-01 12,975
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2018-01-01 868
2017: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2017 401k membership
Total participants, beginning-of-year 2017-01-01 11,880
Total number of active participants reported on line 7a of the Form 5500 2017-01-01 7,446
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 4,513
Total of all active and inactive participants 2017-01-01 11,959
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2017-01-01 91
Total participants 2017-01-01 12,050
Number of participants with account balances 2017-01-01 11,918
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2017-01-01 836
2016: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2016 401k membership
Total participants, beginning-of-year 2016-01-01 11,603
Total number of active participants reported on line 7a of the Form 5500 2016-01-01 7,608
Number of retired or separated participants receiving benefits 2016-01-01 0
Number of other retired or separated participants entitled to future benefits 2016-01-01 4,201
Total of all active and inactive participants 2016-01-01 11,809
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2016-01-01 71
Total participants 2016-01-01 11,880
Number of participants with account balances 2016-01-01 11,713
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2016-01-01 857
2015: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2015 401k membership
Total participants, beginning-of-year 2015-01-01 10,932
Total number of active participants reported on line 7a of the Form 5500 2015-01-01 7,548
Number of retired or separated participants receiving benefits 2015-01-01 0
Number of other retired or separated participants entitled to future benefits 2015-01-01 4,009
Total of all active and inactive participants 2015-01-01 11,557
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2015-01-01 46
Total participants 2015-01-01 11,603
Number of participants with account balances 2015-01-01 11,420
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2015-01-01 970
2014: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2014 401k membership
Total participants, beginning-of-year 2014-01-01 10,256
Total number of active participants reported on line 7a of the Form 5500 2014-01-01 7,389
Number of retired or separated participants receiving benefits 2014-01-01 0
Number of other retired or separated participants entitled to future benefits 2014-01-01 3,509
Total of all active and inactive participants 2014-01-01 10,898
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2014-01-01 34
Total participants 2014-01-01 10,932
Number of participants with account balances 2014-01-01 10,706
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2014-01-01 835
2013: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2013 401k membership
Total participants, beginning-of-year 2013-01-01 10,218
Total number of active participants reported on line 7a of the Form 5500 2013-01-01 7,191
Number of retired or separated participants receiving benefits 2013-01-01 0
Number of other retired or separated participants entitled to future benefits 2013-01-01 3,032
Total of all active and inactive participants 2013-01-01 10,223
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2013-01-01 33
Total participants 2013-01-01 10,256
Number of participants with account balances 2013-01-01 10,119
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2013-01-01 843
2012: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2012 401k membership
Total participants, beginning-of-year 2012-01-01 10,207
Total number of active participants reported on line 7a of the Form 5500 2012-01-01 7,027
Number of retired or separated participants receiving benefits 2012-01-01 0
Number of other retired or separated participants entitled to future benefits 2012-01-01 3,159
Total of all active and inactive participants 2012-01-01 10,186
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2012-01-01 32
Total participants 2012-01-01 10,218
Number of participants with account balances 2012-01-01 10,077
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2012-01-01 780
2011: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2011 401k membership
Total participants, beginning-of-year 2011-01-01 9,988
Total number of active participants reported on line 7a of the Form 5500 2011-01-01 6,987
Number of retired or separated participants receiving benefits 2011-01-01 0
Number of other retired or separated participants entitled to future benefits 2011-01-01 3,186
Total of all active and inactive participants 2011-01-01 10,173
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2011-01-01 34
Total participants 2011-01-01 10,207
Number of participants with account balances 2011-01-01 9,975
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2011-01-01 718
2010: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2010 401k membership
Total participants, beginning-of-year 2010-01-01 10,601
Total number of active participants reported on line 7a of the Form 5500 2010-01-01 7,009
Number of retired or separated participants receiving benefits 2010-01-01 0
Number of other retired or separated participants entitled to future benefits 2010-01-01 2,927
Total of all active and inactive participants 2010-01-01 9,936
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2010-01-01 41
Total participants 2010-01-01 9,977
Number of participants with account balances 2010-01-01 9,849
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2010-01-01 702
2009: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2009 401k membership
Total participants, beginning-of-year 2009-01-01 11,460
Total number of active participants reported on line 7a of the Form 5500 2009-01-01 7,368
Number of retired or separated participants receiving benefits 2009-01-01 0
Number of other retired or separated participants entitled to future benefits 2009-01-01 3,096
Total of all active and inactive participants 2009-01-01 10,464
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits 2009-01-01 39
Total participants 2009-01-01 10,503
Number of participants with account balances 2009-01-01 10,325
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested 2009-01-01 947

Measure	Date	Value
2018: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2018 401k membership
Total participants, beginning-of-year	2018-01-01	12,050
Total number of active participants reported on line 7a of the Form 5500	2018-01-01	8,076
Number of retired or separated participants receiving benefits	2018-01-01	0
Number of other retired or separated participants entitled to future benefits	2018-01-01	4,993
Total of all active and inactive participants	2018-01-01	13,069
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2018-01-01	95
Total participants	2018-01-01	13,164
Number of participants with account balances	2018-01-01	12,975
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2018-01-01	868
2017: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2017 401k membership
Total participants, beginning-of-year	2017-01-01	11,880
Total number of active participants reported on line 7a of the Form 5500	2017-01-01	7,446
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	4,513
Total of all active and inactive participants	2017-01-01	11,959
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2017-01-01	91
Total participants	2017-01-01	12,050
Number of participants with account balances	2017-01-01	11,918
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2017-01-01	836
2016: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2016 401k membership
Total participants, beginning-of-year	2016-01-01	11,603
Total number of active participants reported on line 7a of the Form 5500	2016-01-01	7,608
Number of retired or separated participants receiving benefits	2016-01-01	0
Number of other retired or separated participants entitled to future benefits	2016-01-01	4,201
Total of all active and inactive participants	2016-01-01	11,809
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2016-01-01	71
Total participants	2016-01-01	11,880
Number of participants with account balances	2016-01-01	11,713
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2016-01-01	857
2015: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2015 401k membership
Total participants, beginning-of-year	2015-01-01	10,932
Total number of active participants reported on line 7a of the Form 5500	2015-01-01	7,548
Number of retired or separated participants receiving benefits	2015-01-01	0
Number of other retired or separated participants entitled to future benefits	2015-01-01	4,009
Total of all active and inactive participants	2015-01-01	11,557
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2015-01-01	46
Total participants	2015-01-01	11,603
Number of participants with account balances	2015-01-01	11,420
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2015-01-01	970
2014: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2014 401k membership
Total participants, beginning-of-year	2014-01-01	10,256
Total number of active participants reported on line 7a of the Form 5500	2014-01-01	7,389
Number of retired or separated participants receiving benefits	2014-01-01	0
Number of other retired or separated participants entitled to future benefits	2014-01-01	3,509
Total of all active and inactive participants	2014-01-01	10,898
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2014-01-01	34
Total participants	2014-01-01	10,932
Number of participants with account balances	2014-01-01	10,706
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2014-01-01	835
2013: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2013 401k membership
Total participants, beginning-of-year	2013-01-01	10,218
Total number of active participants reported on line 7a of the Form 5500	2013-01-01	7,191
Number of retired or separated participants receiving benefits	2013-01-01	0
Number of other retired or separated participants entitled to future benefits	2013-01-01	3,032
Total of all active and inactive participants	2013-01-01	10,223
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2013-01-01	33
Total participants	2013-01-01	10,256
Number of participants with account balances	2013-01-01	10,119
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2013-01-01	843
2012: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2012 401k membership
Total participants, beginning-of-year	2012-01-01	10,207
Total number of active participants reported on line 7a of the Form 5500	2012-01-01	7,027
Number of retired or separated participants receiving benefits	2012-01-01	0
Number of other retired or separated participants entitled to future benefits	2012-01-01	3,159
Total of all active and inactive participants	2012-01-01	10,186
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2012-01-01	32
Total participants	2012-01-01	10,218
Number of participants with account balances	2012-01-01	10,077
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2012-01-01	780
2011: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2011 401k membership
Total participants, beginning-of-year	2011-01-01	9,988
Total number of active participants reported on line 7a of the Form 5500	2011-01-01	6,987
Number of retired or separated participants receiving benefits	2011-01-01	0
Number of other retired or separated participants entitled to future benefits	2011-01-01	3,186
Total of all active and inactive participants	2011-01-01	10,173
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2011-01-01	34
Total participants	2011-01-01	10,207
Number of participants with account balances	2011-01-01	9,975
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2011-01-01	718
2010: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2010 401k membership
Total participants, beginning-of-year	2010-01-01	10,601
Total number of active participants reported on line 7a of the Form 5500	2010-01-01	7,009
Number of retired or separated participants receiving benefits	2010-01-01	0
Number of other retired or separated participants entitled to future benefits	2010-01-01	2,927
Total of all active and inactive participants	2010-01-01	9,936
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2010-01-01	41
Total participants	2010-01-01	9,977
Number of participants with account balances	2010-01-01	9,849
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2010-01-01	702
2009: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2009 401k membership
Total participants, beginning-of-year	2009-01-01	11,460
Total number of active participants reported on line 7a of the Form 5500	2009-01-01	7,368
Number of retired or separated participants receiving benefits	2009-01-01	0
Number of other retired or separated participants entitled to future benefits	2009-01-01	3,096
Total of all active and inactive participants	2009-01-01	10,464
Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits	2009-01-01	39
Total participants	2009-01-01	10,503
Number of participants with account balances	2009-01-01	10,325
Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested	2009-01-01	947

Financial Data on MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN

Measure	Date	Value
2018 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2018 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2018-12-31	$-22,049,838
Total unrealized appreciation/depreciation of assets	2018-12-31	$-22,049,838
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2018-12-31	$80,067
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2018-12-31	$74,728
Total income from all sources (including contributions)	2018-12-31	$37,791,514
Total loss/gain on sale of assets	2018-12-31	$330,394
Total of all expenses incurred	2018-12-31	$87,942,111
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2018-12-31	$87,185,088
Expenses. Certain deemed distributions of participant loans	2018-12-31	$447,701
Value of total corrective distributions	2018-12-31	$5,933
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2018-12-31	$90,000,826
Value of total assets at end of year	2018-12-31	$970,117,009
Value of total assets at beginning of year	2018-12-31	$1,020,262,267
Total of administrative expenses incurred including professional, contract, advisory and management fees	2018-12-31	$303,389
Total interest from all sources	2018-12-31	$1,232,851
Total dividends received (eg from common stock, registered investment company shares)	2018-12-31	$15,396,077
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	$9,576,198
Administrative expenses professional fees incurred	2018-12-31	$25,898
Was this plan covered by a fidelity bond	2018-12-31	Yes
Value of fidelity bond cover	2018-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2018-12-31	No
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	$45,017,061
Participant contributions at end of year	2018-12-31	$25,873,249
Participant contributions at beginning of year	2018-12-31	$24,890,166
Participant contributions at end of year	2018-12-31	$412,895
Participant contributions at beginning of year	2018-12-31	$335,828
Income. Received or receivable in cash from other sources (including rollovers)	2018-12-31	$2,662,156
Value of other receiveables (less allowance for doubtful accounts) at end of year	2018-12-31	$1,503,896
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2018-12-31	$1,528,749
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2018-12-31	$4,806
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2018-12-31	$79
Liabilities. Value of operating payables at end of year	2018-12-31	$75,261
Liabilities. Value of operating payables at beginning of year	2018-12-31	$74,649
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
Value of net income/loss	2018-12-31	$-50,150,597
Value of net assets at end of year (total assets less liabilities)	2018-12-31	$970,036,942
Value of net assets at beginning of year (total assets less liabilities)	2018-12-31	$1,020,187,539
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
Investment advisory and management fees	2018-12-31	$83,695
Value of interest in registered invesment companies (eg mutual funds) at end of year	2018-12-31	$619,247,977
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2018-12-31	$637,573,318
Value of interest in pooled separate accounts at end of year	2018-12-31	$90,717,946
Value of interest in pooled separate accounts at beginning of year	2018-12-31	$92,090,287
Interest on participant loans	2018-12-31	$1,182,212
Value of interest in common/collective trusts at end of year	2018-12-31	$35,845,958
Value of interest in common/collective trusts at beginning of year	2018-12-31	$37,782,799
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2018-12-31	$2,725,232
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2018-12-31	$3,247,035
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2018-12-31	$3,247,035
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2018-12-31	$50,639
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2018-12-31	$-48,970,466
Net investment gain/loss from pooled separate accounts	2018-12-31	$1,928,330
Net investment gain or loss from common/collective trusts	2018-12-31	$-76,660
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	Yes
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	$173,390,990
Assets. Invements in employer securities at beginning of year	2018-12-31	$202,906,126
Contributions received in cash from employer	2018-12-31	$42,321,609
Employer contributions (assets) at end of year	2018-12-31	$20,398,866
Employer contributions (assets) at beginning of year	2018-12-31	$19,907,959
Income. Dividends from common stock	2018-12-31	$5,819,879
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2018-12-31	$87,185,088
Contract administrator fees	2018-12-31	$193,796
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	$20,507,780
Aggregate carrying amount (costs) on sale of assets	2018-12-31	$20,177,386
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2018-12-31	No
Opinion of an independent qualified public accountant for this plan	2018-12-31	Unqualified
Accountancy firm name	2018-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2018-12-31	390859910
2017 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2017 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2017-12-31	$-13,221,848
Total unrealized appreciation/depreciation of assets	2017-12-31	$-13,221,848
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-12-31	$74,728
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2017-12-31	$71,393
Total income from all sources (including contributions)	2017-12-31	$189,600,553
Total loss/gain on sale of assets	2017-12-31	$-1,917,232
Total of all expenses incurred	2017-12-31	$87,505,111
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2017-12-31	$87,048,674
Expenses. Certain deemed distributions of participant loans	2017-12-31	$148,454
Value of total corrective distributions	2017-12-31	$1,123
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2017-12-31	$86,190,057
Value of total assets at end of year	2017-12-31	$1,020,262,267
Value of total assets at beginning of year	2017-12-31	$918,163,490
Total of administrative expenses incurred including professional, contract, advisory and management fees	2017-12-31	$306,860
Total interest from all sources	2017-12-31	$1,051,978
Total dividends received (eg from common stock, registered investment company shares)	2017-12-31	$14,352,004
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	$8,345,564
Administrative expenses professional fees incurred	2017-12-31	$23,700
Was this plan covered by a fidelity bond	2017-12-31	Yes
Value of fidelity bond cover	2017-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2017-12-31	No
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	$41,446,111
Participant contributions at end of year	2017-12-31	$24,890,166
Participant contributions at beginning of year	2017-12-31	$23,291,633
Participant contributions at end of year	2017-12-31	$335,828
Participant contributions at beginning of year	2017-12-31	$313,859
Income. Received or receivable in cash from other sources (including rollovers)	2017-12-31	$4,198,606
Value of other receiveables (less allowance for doubtful accounts) at end of year	2017-12-31	$1,528,749
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2017-12-31	$1,568,357
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2017-12-31	$79
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2017-12-31	$18,935
Administrative expenses (other) incurred	2017-12-31	$2,500
Liabilities. Value of operating payables at end of year	2017-12-31	$74,649
Liabilities. Value of operating payables at beginning of year	2017-12-31	$52,458
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
Value of net income/loss	2017-12-31	$102,095,442
Value of net assets at end of year (total assets less liabilities)	2017-12-31	$1,020,187,539
Value of net assets at beginning of year (total assets less liabilities)	2017-12-31	$918,092,097
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
Investment advisory and management fees	2017-12-31	$54,952
Value of interest in registered invesment companies (eg mutual funds) at end of year	2017-12-31	$637,573,318
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2017-12-31	$505,976,785
Value of interest in pooled separate accounts at end of year	2017-12-31	$92,090,287
Value of interest in pooled separate accounts at beginning of year	2017-12-31	$102,734,566
Interest on participant loans	2017-12-31	$1,027,919
Value of interest in common/collective trusts at end of year	2017-12-31	$37,782,799
Value of interest in common/collective trusts at beginning of year	2017-12-31	$33,750,816
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2017-12-31	$3,247,035
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2017-12-31	$3,101,609
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2017-12-31	$3,101,609
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2017-12-31	$24,059
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2017-12-31	$99,985,227
Net investment gain/loss from pooled separate accounts	2017-12-31	$1,731,031
Net investment gain or loss from common/collective trusts	2017-12-31	$1,429,336
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	$202,906,126
Assets. Invements in employer securities at beginning of year	2017-12-31	$228,821,418
Contributions received in cash from employer	2017-12-31	$40,545,340
Employer contributions (assets) at end of year	2017-12-31	$19,907,959
Employer contributions (assets) at beginning of year	2017-12-31	$18,604,447
Income. Dividends from common stock	2017-12-31	$6,006,440
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2017-12-31	$87,048,674
Contract administrator fees	2017-12-31	$225,708
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	$28,161,627
Aggregate carrying amount (costs) on sale of assets	2017-12-31	$30,078,859
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2017-12-31	No
Opinion of an independent qualified public accountant for this plan	2017-12-31	Unqualified
Accountancy firm name	2017-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2017-12-31	390859910
2016 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2016 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2016-12-31	$82,014,605
Total unrealized appreciation/depreciation of assets	2016-12-31	$82,014,605
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2016-12-31	$71,393
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2016-12-31	$55,430
Total income from all sources (including contributions)	2016-12-31	$225,633,079
Total loss/gain on sale of assets	2016-12-31	$7,099,798
Total of all expenses incurred	2016-12-31	$84,746,234
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2016-12-31	$84,305,552
Expenses. Certain deemed distributions of participant loans	2016-12-31	$34,438
Value of total corrective distributions	2016-12-31	$45,141
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2016-12-31	$80,380,952
Value of total assets at end of year	2016-12-31	$918,163,490
Value of total assets at beginning of year	2016-12-31	$777,260,682
Total of administrative expenses incurred including professional, contract, advisory and management fees	2016-12-31	$361,103
Total interest from all sources	2016-12-31	$911,549
Total dividends received (eg from common stock, registered investment company shares)	2016-12-31	$14,130,798
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2016-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2016-12-31	$7,673,307
Administrative expenses professional fees incurred	2016-12-31	$22,200
Was this plan covered by a fidelity bond	2016-12-31	Yes
Value of fidelity bond cover	2016-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2016-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2016-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2016-12-31	No
Contributions received from participants	2016-12-31	$39,896,044
Participant contributions at end of year	2016-12-31	$23,291,633
Participant contributions at beginning of year	2016-12-31	$22,333,703
Participant contributions at end of year	2016-12-31	$313,859
Participant contributions at beginning of year	2016-12-31	$358,141
Income. Received or receivable in cash from other sources (including rollovers)	2016-12-31	$2,264,422
Value of other receiveables (less allowance for doubtful accounts) at end of year	2016-12-31	$1,568,357
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2016-12-31	$1,629,151
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2016-12-31	$18,935
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2016-12-31	$3,849
Liabilities. Value of operating payables at end of year	2016-12-31	$52,458
Liabilities. Value of operating payables at beginning of year	2016-12-31	$51,581
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2016-12-31	No
Value of net income/loss	2016-12-31	$140,886,845
Value of net assets at end of year (total assets less liabilities)	2016-12-31	$918,092,097
Value of net assets at beginning of year (total assets less liabilities)	2016-12-31	$777,205,252
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2016-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2016-12-31	No
Were any leases to which the plan was party in default or uncollectible	2016-12-31	No
Investment advisory and management fees	2016-12-31	$41,370
Value of interest in registered invesment companies (eg mutual funds) at end of year	2016-12-31	$505,976,785
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2016-12-31	$454,816,333
Value of interest in pooled separate accounts at end of year	2016-12-31	$102,734,566
Value of interest in pooled separate accounts at beginning of year	2016-12-31	$88,806,420
Interest on participant loans	2016-12-31	$907,302
Value of interest in common/collective trusts at end of year	2016-12-31	$33,750,816
Value of interest in common/collective trusts at beginning of year	2016-12-31	$31,430,271
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2016-12-31	$3,101,609
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2016-12-31	$2,572,088
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2016-12-31	$2,572,088
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2016-12-31	$4,247
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2016-12-31	$38,397,330
Net investment gain/loss from pooled separate accounts	2016-12-31	$1,510,040
Net investment gain or loss from common/collective trusts	2016-12-31	$1,188,007
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2016-12-31	No
Was there a failure to transmit to the plan any participant contributions	2016-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2016-12-31	No
Assets. Invements in employer securities at end of year	2016-12-31	$228,821,418
Assets. Invements in employer securities at beginning of year	2016-12-31	$159,297,200
Contributions received in cash from employer	2016-12-31	$38,220,486
Employer contributions (assets) at end of year	2016-12-31	$18,604,447
Employer contributions (assets) at beginning of year	2016-12-31	$16,017,375
Income. Dividends from common stock	2016-12-31	$6,457,491
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2016-12-31	$84,305,552
Contract administrator fees	2016-12-31	$297,533
Did the plan have assets held for investment	2016-12-31	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	2016-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2016-12-31	No
Aggregate proceeds on sale of assets	2016-12-31	$32,530,316
Aggregate carrying amount (costs) on sale of assets	2016-12-31	$25,430,518
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2016-12-31	No
Opinion of an independent qualified public accountant for this plan	2016-12-31	Unqualified
Accountancy firm name	2016-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2016-12-31	390859910
2015 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2015 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2015-12-31	$-41,461,401
Total unrealized appreciation/depreciation of assets	2015-12-31	$-41,461,401
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2015-12-31	$55,430
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2015-12-31	$72,615
Total income from all sources (including contributions)	2015-12-31	$41,861,487
Total loss/gain on sale of assets	2015-12-31	$-1,374,456
Total of all expenses incurred	2015-12-31	$73,140,381
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2015-12-31	$72,792,874
Expenses. Certain deemed distributions of participant loans	2015-12-31	$63,910
Value of total corrective distributions	2015-12-31	$3,653
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2015-12-31	$76,568,066
Value of total assets at end of year	2015-12-31	$777,260,682
Value of total assets at beginning of year	2015-12-31	$808,556,761
Total of administrative expenses incurred including professional, contract, advisory and management fees	2015-12-31	$279,944
Total interest from all sources	2015-12-31	$883,778
Total dividends received (eg from common stock, registered investment company shares)	2015-12-31	$13,451,863
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2015-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2015-12-31	$7,217,211
Administrative expenses professional fees incurred	2015-12-31	$21,500
Was this plan covered by a fidelity bond	2015-12-31	Yes
Value of fidelity bond cover	2015-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2015-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2015-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2015-12-31	No
Contributions received from participants	2015-12-31	$39,434,890
Participant contributions at end of year	2015-12-31	$22,333,703
Participant contributions at beginning of year	2015-12-31	$21,647,829
Participant contributions at end of year	2015-12-31	$358,141
Participant contributions at beginning of year	2015-12-31	$964,026
Income. Received or receivable in cash from other sources (including rollovers)	2015-12-31	$1,571,805
Value of other receiveables (less allowance for doubtful accounts) at end of year	2015-12-31	$1,629,151
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2015-12-31	$1,497,305
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2015-12-31	$3,849
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2015-12-31	$7,798
Liabilities. Value of operating payables at end of year	2015-12-31	$51,581
Liabilities. Value of operating payables at beginning of year	2015-12-31	$64,817
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2015-12-31	No
Value of net income/loss	2015-12-31	$-31,278,894
Value of net assets at end of year (total assets less liabilities)	2015-12-31	$777,205,252
Value of net assets at beginning of year (total assets less liabilities)	2015-12-31	$808,484,146
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2015-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2015-12-31	No
Were any leases to which the plan was party in default or uncollectible	2015-12-31	No
Investment advisory and management fees	2015-12-31	$9,500
Value of interest in registered invesment companies (eg mutual funds) at end of year	2015-12-31	$454,816,333
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2015-12-31	$461,766,077
Value of interest in pooled separate accounts at end of year	2015-12-31	$88,806,420
Value of interest in pooled separate accounts at beginning of year	2015-12-31	$91,410,080
Interest on participant loans	2015-12-31	$883,432
Value of interest in common/collective trusts at end of year	2015-12-31	$31,430,271
Value of interest in common/collective trusts at beginning of year	2015-12-31	$22,767,093
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2015-12-31	$2,572,088
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2015-12-31	$3,482,710
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2015-12-31	$3,482,710
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2015-12-31	$346
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2015-12-31	$-6,685,859
Net investment gain/loss from pooled separate accounts	2015-12-31	$899,500
Net investment gain or loss from common/collective trusts	2015-12-31	$-420,004
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2015-12-31	No
Was there a failure to transmit to the plan any participant contributions	2015-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2015-12-31	No
Assets. Invements in employer securities at end of year	2015-12-31	$159,297,200
Assets. Invements in employer securities at beginning of year	2015-12-31	$190,266,340
Contributions received in cash from employer	2015-12-31	$35,561,371
Employer contributions (assets) at end of year	2015-12-31	$16,017,375
Employer contributions (assets) at beginning of year	2015-12-31	$14,755,301
Income. Dividends from common stock	2015-12-31	$6,234,652
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2015-12-31	$72,792,874
Contract administrator fees	2015-12-31	$248,944
Did the plan have assets held for investment	2015-12-31	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	2015-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2015-12-31	No
Aggregate proceeds on sale of assets	2015-12-31	$8,557,551
Aggregate carrying amount (costs) on sale of assets	2015-12-31	$9,932,007
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2015-12-31	No
Opinion of an independent qualified public accountant for this plan	2015-12-31	Unqualified
Accountancy firm name	2015-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2015-12-31	390859910
2014 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2014 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2014-12-31	$-57,322,086
Total unrealized appreciation/depreciation of assets	2014-12-31	$-57,322,086
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2014-12-31	$72,615
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2014-12-31	$43,348
Total income from all sources (including contributions)	2014-12-31	$52,356,896
Total loss/gain on sale of assets	2014-12-31	$788,790
Total of all expenses incurred	2014-12-31	$76,870,559
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2014-12-31	$76,614,583
Expenses. Certain deemed distributions of participant loans	2014-12-31	$20,994
Value of total corrective distributions	2014-12-31	$11,699
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2014-12-31	$71,757,243
Value of total assets at end of year	2014-12-31	$808,556,761
Value of total assets at beginning of year	2014-12-31	$833,041,157
Total of administrative expenses incurred including professional, contract, advisory and management fees	2014-12-31	$223,283
Total interest from all sources	2014-12-31	$795,514
Total dividends received (eg from common stock, registered investment company shares)	2014-12-31	$13,177,590
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2014-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2014-12-31	$7,319,811
Was this plan covered by a fidelity bond	2014-12-31	Yes
Value of fidelity bond cover	2014-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2014-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2014-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2014-12-31	No
Contributions received from participants	2014-12-31	$36,610,681
Participant contributions at end of year	2014-12-31	$21,647,829
Participant contributions at beginning of year	2014-12-31	$20,000,516
Participant contributions at end of year	2014-12-31	$964,026
Participant contributions at beginning of year	2014-12-31	$869,031
Income. Received or receivable in cash from other sources (including rollovers)	2014-12-31	$1,903,788
Value of other receiveables (less allowance for doubtful accounts) at end of year	2014-12-31	$1,497,305
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2014-12-31	$1,521,752
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2014-12-31	$7,798
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2014-12-31	$0
Administrative expenses (other) incurred	2014-12-31	$459
Liabilities. Value of operating payables at end of year	2014-12-31	$64,817
Liabilities. Value of operating payables at beginning of year	2014-12-31	$43,348
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2014-12-31	No
Value of net income/loss	2014-12-31	$-24,513,663
Value of net assets at end of year (total assets less liabilities)	2014-12-31	$808,484,146
Value of net assets at beginning of year (total assets less liabilities)	2014-12-31	$832,997,809
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2014-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2014-12-31	No
Were any leases to which the plan was party in default or uncollectible	2014-12-31	No
Investment advisory and management fees	2014-12-31	$12,648
Value of interest in registered invesment companies (eg mutual funds) at end of year	2014-12-31	$461,766,077
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2014-12-31	$420,986,695
Value of interest in pooled separate accounts at end of year	2014-12-31	$91,410,080
Value of interest in pooled separate accounts at beginning of year	2014-12-31	$93,292,503
Interest on participant loans	2014-12-31	$794,742
Value of interest in common/collective trusts at end of year	2014-12-31	$22,767,093
Value of interest in common/collective trusts at beginning of year	2014-12-31	$21,651,678
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2014-12-31	$3,482,710
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2014-12-31	$2,924,943
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2014-12-31	$2,924,943
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2014-12-31	$772
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2014-12-31	$20,184,985
Net investment gain/loss from pooled separate accounts	2014-12-31	$1,645,913
Net investment gain or loss from common/collective trusts	2014-12-31	$1,328,947
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2014-12-31	No
Was there a failure to transmit to the plan any participant contributions	2014-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2014-12-31	No
Assets. Invements in employer securities at end of year	2014-12-31	$190,266,340
Assets. Invements in employer securities at beginning of year	2014-12-31	$257,504,422
Contributions received in cash from employer	2014-12-31	$33,242,774
Employer contributions (assets) at end of year	2014-12-31	$14,755,301
Employer contributions (assets) at beginning of year	2014-12-31	$14,289,617
Income. Dividends from common stock	2014-12-31	$5,857,779
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2014-12-31	$76,614,583
Contract administrator fees	2014-12-31	$210,176
Did the plan have assets held for investment	2014-12-31	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	2014-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2014-12-31	No
Aggregate proceeds on sale of assets	2014-12-31	$24,148,825
Aggregate carrying amount (costs) on sale of assets	2014-12-31	$23,360,035
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2014-12-31	No
Opinion of an independent qualified public accountant for this plan	2014-12-31	Unqualified
Accountancy firm name	2014-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2014-12-31	390859910
2013 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2013 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2013-12-31	$76,665,538
Total unrealized appreciation/depreciation of assets	2013-12-31	$76,665,538
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2013-12-31	$43,348
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2013-12-31	$73,090
Total income from all sources (including contributions)	2013-12-31	$247,628,934
Total loss/gain on sale of assets	2013-12-31	$6,047,126
Total of all expenses incurred	2013-12-31	$71,678,890
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2013-12-31	$71,274,829
Expenses. Certain deemed distributions of participant loans	2013-12-31	$122,022
Value of total corrective distributions	2013-12-31	$0
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2013-12-31	$66,209,827
Value of total assets at end of year	2013-12-31	$833,041,157
Value of total assets at beginning of year	2013-12-31	$657,120,855
Total of administrative expenses incurred including professional, contract, advisory and management fees	2013-12-31	$282,039
Total interest from all sources	2013-12-31	$747,340
Total dividends received (eg from common stock, registered investment company shares)	2013-12-31	$11,162,134
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2013-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2013-12-31	$5,087,794
Was this plan covered by a fidelity bond	2013-12-31	Yes
Value of fidelity bond cover	2013-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2013-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2013-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2013-12-31	No
Contributions received from participants	2013-12-31	$33,174,622
Participant contributions at end of year	2013-12-31	$20,000,516
Participant contributions at beginning of year	2013-12-31	$18,434,378
Participant contributions at end of year	2013-12-31	$869,031
Participant contributions at beginning of year	2013-12-31	$952,840
Income. Received or receivable in cash from other sources (including rollovers)	2013-12-31	$1,625,542
Value of other receiveables (less allowance for doubtful accounts) at end of year	2013-12-31	$1,521,752
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2013-12-31	$227
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2013-12-31	$0
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2013-12-31	$10,755
Liabilities. Value of operating payables at end of year	2013-12-31	$43,348
Liabilities. Value of operating payables at beginning of year	2013-12-31	$62,335
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2013-12-31	No
Value of net income/loss	2013-12-31	$175,950,044
Value of net assets at end of year (total assets less liabilities)	2013-12-31	$832,997,809
Value of net assets at beginning of year (total assets less liabilities)	2013-12-31	$657,047,765
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2013-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2013-12-31	No
Were any leases to which the plan was party in default or uncollectible	2013-12-31	No
Investment advisory and management fees	2013-12-31	$32,233
Value of interest in registered invesment companies (eg mutual funds) at end of year	2013-12-31	$420,986,695
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2013-12-31	$313,685,688
Value of interest in pooled separate accounts at end of year	2013-12-31	$93,292,503
Value of interest in pooled separate accounts at beginning of year	2013-12-31	$89,789,905
Interest on participant loans	2013-12-31	$747,025
Value of interest in common/collective trusts at end of year	2013-12-31	$21,651,678
Value of interest in common/collective trusts at beginning of year	2013-12-31	$24,424,004
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2013-12-31	$2,924,943
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2013-12-31	$3,832,391
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2013-12-31	$3,832,391
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2013-12-31	$315
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2013-12-31	$86,930,153
Net investment gain/loss from pooled separate accounts	2013-12-31	$347,893
Net investment gain or loss from common/collective trusts	2013-12-31	$-481,077
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2013-12-31	No
Was there a failure to transmit to the plan any participant contributions	2013-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2013-12-31	No
Assets. Invements in employer securities at end of year	2013-12-31	$257,504,422
Assets. Invements in employer securities at beginning of year	2013-12-31	$195,418,132
Contributions received in cash from employer	2013-12-31	$31,409,663
Employer contributions (assets) at end of year	2013-12-31	$14,289,617
Employer contributions (assets) at beginning of year	2013-12-31	$10,583,290
Income. Dividends from common stock	2013-12-31	$6,074,340
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2013-12-31	$71,274,829
Contract administrator fees	2013-12-31	$249,806
Did the plan have assets held for investment	2013-12-31	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	2013-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2013-12-31	No
Aggregate proceeds on sale of assets	2013-12-31	$31,929,254
Aggregate carrying amount (costs) on sale of assets	2013-12-31	$25,882,128
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2013-12-31	No
Opinion of an independent qualified public accountant for this plan	2013-12-31	Unqualified
Accountancy firm name	2013-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2013-12-31	390859910
2012 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2012 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2012-12-31	$-2,400,729
Total unrealized appreciation/depreciation of assets	2012-12-31	$-2,400,729
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2012-12-31	$73,090
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2012-12-31	$200,494
Total income from all sources (including contributions)	2012-12-31	$110,491,975
Total loss/gain on sale of assets	2012-12-31	$429,341
Total of all expenses incurred	2012-12-31	$72,886,250
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2012-12-31	$72,550,522
Expenses. Certain deemed distributions of participant loans	2012-12-31	$69,383
Value of total corrective distributions	2012-12-31	$730
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2012-12-31	$58,122,724
Value of total assets at end of year	2012-12-31	$657,120,855
Value of total assets at beginning of year	2012-12-31	$619,642,534
Total of administrative expenses incurred including professional, contract, advisory and management fees	2012-12-31	$265,615
Total interest from all sources	2012-12-31	$722,903
Total dividends received (eg from common stock, registered investment company shares)	2012-12-31	$11,858,322
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2012-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2012-12-31	$5,400,662
Administrative expenses professional fees incurred	2012-12-31	$18,500
Was this plan covered by a fidelity bond	2012-12-31	Yes
Value of fidelity bond cover	2012-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2012-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2012-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2012-12-31	No
Contributions received from participants	2012-12-31	$30,451,503
Participant contributions at end of year	2012-12-31	$18,434,378
Participant contributions at beginning of year	2012-12-31	$18,085,584
Participant contributions at end of year	2012-12-31	$952,840
Participant contributions at beginning of year	2012-12-31	$762,362
Income. Received or receivable in cash from other sources (including rollovers)	2012-12-31	$899,848
Value of other receiveables (less allowance for doubtful accounts) at end of year	2012-12-31	$227
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2012-12-31	$1,627,919
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2012-12-31	$10,755
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year	2012-12-31	$158,750
Administrative expenses (other) incurred	2012-12-31	$3,000
Liabilities. Value of operating payables at end of year	2012-12-31	$62,335
Liabilities. Value of operating payables at beginning of year	2012-12-31	$41,744
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2012-12-31	No
Value of net income/loss	2012-12-31	$37,605,725
Value of net assets at end of year (total assets less liabilities)	2012-12-31	$657,047,765
Value of net assets at beginning of year (total assets less liabilities)	2012-12-31	$619,442,040
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2012-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2012-12-31	No
Were any leases to which the plan was party in default or uncollectible	2012-12-31	No
Investment advisory and management fees	2012-12-31	$30,668
Value of interest in registered invesment companies (eg mutual funds) at end of year	2012-12-31	$313,685,688
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2012-12-31	$260,173,086
Value of interest in pooled separate accounts at end of year	2012-12-31	$89,789,905
Value of interest in pooled separate accounts at beginning of year	2012-12-31	$87,770,586
Interest on participant loans	2012-12-31	$721,678
Value of interest in common/collective trusts at end of year	2012-12-31	$24,424,004
Value of interest in common/collective trusts at beginning of year	2012-12-31	$25,491,338
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2012-12-31	$3,832,391
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2012-12-31	$2,734,981
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2012-12-31	$2,734,981
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2012-12-31	$1,225
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2012-12-31	$36,077,786
Net investment gain/loss from pooled separate accounts	2012-12-31	$4,656,789
Net investment gain or loss from common/collective trusts	2012-12-31	$1,024,839
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2012-12-31	No
Was there a failure to transmit to the plan any participant contributions	2012-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2012-12-31	No
Assets. Invements in employer securities at end of year	2012-12-31	$195,418,132
Assets. Invements in employer securities at beginning of year	2012-12-31	$207,635,372
Contributions received in cash from employer	2012-12-31	$26,771,373
Employer contributions (assets) at end of year	2012-12-31	$10,583,290
Employer contributions (assets) at beginning of year	2012-12-31	$15,361,306
Income. Dividends from common stock	2012-12-31	$6,457,660
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2012-12-31	$72,550,522
Contract administrator fees	2012-12-31	$213,447
Did the plan have assets held for investment	2012-12-31	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	2012-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2012-12-31	No
Aggregate proceeds on sale of assets	2012-12-31	$25,555,487
Aggregate carrying amount (costs) on sale of assets	2012-12-31	$25,126,146
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2012-12-31	No
Opinion of an independent qualified public accountant for this plan	2012-12-31	Unqualified
Accountancy firm name	2012-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2012-12-31	390859910
2011 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2011 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2011-12-31	$11,339,768
Total unrealized appreciation/depreciation of assets	2011-12-31	$11,339,768
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2011-12-31	$200,494
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2011-12-31	$0
Total income from all sources (including contributions)	2011-12-31	$68,927,142
Total loss/gain on sale of assets	2011-12-31	$1,159,165
Total of all expenses incurred	2011-12-31	$59,517,980
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2011-12-31	$59,294,687
Expenses. Certain deemed distributions of participant loans	2011-12-31	$87,824
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2011-12-31	$54,392,475
Value of total assets at end of year	2011-12-31	$619,642,534
Value of total assets at beginning of year	2011-12-31	$610,032,878
Total of administrative expenses incurred including professional, contract, advisory and management fees	2011-12-31	$135,469
Total interest from all sources	2011-12-31	$749,412
Total dividends received (eg from common stock, registered investment company shares)	2011-12-31	$11,435,226
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2011-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2011-12-31	$4,965,508
Was this plan covered by a fidelity bond	2011-12-31	Yes
Value of fidelity bond cover	2011-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2011-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2011-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2011-12-31	No
Contributions received from participants	2011-12-31	$27,299,518
Participant contributions at end of year	2011-12-31	$18,085,584
Participant contributions at beginning of year	2011-12-31	$17,270,039
Participant contributions at end of year	2011-12-31	$762,362
Participant contributions at beginning of year	2011-12-31	$723,508
Assets. Other investments not covered elsewhere at beginning of year	2011-12-31	$0
Income. Received or receivable in cash from other sources (including rollovers)	2011-12-31	$1,018,511
Value of other receiveables (less allowance for doubtful accounts) at end of year	2011-12-31	$1,627,919
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2011-12-31	$1,648,748
Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year	2011-12-31	$158,750
Liabilities. Value of operating payables at end of year	2011-12-31	$41,744
Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser	2011-12-31	No
Value of net income/loss	2011-12-31	$9,409,162
Value of net assets at end of year (total assets less liabilities)	2011-12-31	$619,442,040
Value of net assets at beginning of year (total assets less liabilities)	2011-12-31	$610,032,878
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2011-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2011-12-31	No
Were any leases to which the plan was party in default or uncollectible	2011-12-31	No
Investment advisory and management fees	2011-12-31	$26,234
Value of interest in registered invesment companies (eg mutual funds) at end of year	2011-12-31	$260,173,086
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2011-12-31	$289,935,503
Value of interest in pooled separate accounts at end of year	2011-12-31	$87,770,586
Value of interest in pooled separate accounts at beginning of year	2011-12-31	$81,131,450
Interest on participant loans	2011-12-31	$749,126
Value of interest in common/collective trusts at end of year	2011-12-31	$25,491,338
Value of interest in common/collective trusts at beginning of year	2011-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2011-12-31	$2,734,981
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2011-12-31	$2,435,978
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2011-12-31	$2,435,978
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2011-12-31	$286
Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year	2011-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2011-12-31	$-12,801,434
Net investment gain/loss from pooled separate accounts	2011-12-31	$2,137,996
Net investment gain or loss from common/collective trusts	2011-12-31	$514,534
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2011-12-31	No
Was there a failure to transmit to the plan any participant contributions	2011-12-31	Yes
Has the plan failed to provide any benefit when due under the plan	2011-12-31	No
Assets. Invements in employer securities at end of year	2011-12-31	$207,635,372
Assets. Invements in employer securities at beginning of year	2011-12-31	$204,476,605
Contributions received in cash from employer	2011-12-31	$26,074,446
Employer contributions (assets) at end of year	2011-12-31	$15,361,306
Employer contributions (assets) at beginning of year	2011-12-31	$12,411,047
Income. Dividends from common stock	2011-12-31	$6,469,718
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2011-12-31	$59,294,687
Contract administrator fees	2011-12-31	$109,235
Did the plan have assets held for investment	2011-12-31	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	2011-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2011-12-31	No
Aggregate proceeds on sale of assets	2011-12-31	$19,898,293
Aggregate carrying amount (costs) on sale of assets	2011-12-31	$18,739,128
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2011-12-31	No
Opinion of an independent qualified public accountant for this plan	2011-12-31	Unqualified
Accountancy firm name	2011-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2011-12-31	390859910
2010 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2010 401k financial data
Unrealized appreciation/depreciation of other (non real estate) assets	2010-12-31	$-31,868,548
Total unrealized appreciation/depreciation of assets	2010-12-31	$-31,868,548
Total transfer of assets to this plan	2010-12-31	$0
Total transfer of assets from this plan	2010-12-31	$0
Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2010-12-31	$0
Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities)	2010-12-31	$0
Total income from all sources (including contributions)	2010-12-31	$61,741,902
Total loss/gain on sale of assets	2010-12-31	$-3,397,230
Total of all expenses incurred	2010-12-31	$57,531,780
Benefit payments and payments to participlants,beneficiaries,insurance carriers and others	2010-12-31	$57,405,409
Expenses. Certain deemed distributions of participant loans	2010-12-31	$17,540
Value of total corrective distributions	2010-12-31	$13,354
Total contributions o plan (from employers,participants, others, non cash contrinutions)	2010-12-31	$51,794,631
Value of total assets at end of year	2010-12-31	$610,032,878
Value of total assets at beginning of year	2010-12-31	$605,822,756
Total of administrative expenses incurred including professional, contract, advisory and management fees	2010-12-31	$95,477
Total interest from all sources	2010-12-31	$747,324
Total dividends received (eg from common stock, registered investment company shares)	2010-12-31	$10,947,063
Has a resolution to terminate the plan been adopted during the plan year or any prior plan year	2010-12-31	No
Total dividends received from registered investment company shares (eg mutual funds)	2010-12-31	$4,364,759
Administrative expenses professional fees incurred	2010-12-31	$0
Was this plan covered by a fidelity bond	2010-12-31	Yes
Value of fidelity bond cover	2010-12-31	$10,000,000
If this is an individual account plan, was there a blackout period	2010-12-31	No
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2010-12-31	$0
Were there any nonexempt tranactions with any party-in-interest	2010-12-31	No
Contributions received from participants	2010-12-31	$27,366,554
Participant contributions at end of year	2010-12-31	$17,270,039
Participant contributions at beginning of year	2010-12-31	$15,125,322
Participant contributions at end of year	2010-12-31	$723,508
Participant contributions at beginning of year	2010-12-31	$774,967
Assets. Other investments not covered elsewhere at end of year	2010-12-31	$0
Income. Received or receivable in cash from other sources (including rollovers)	2010-12-31	$737,271
Value of other receiveables (less allowance for doubtful accounts) at end of year	2010-12-31	$1,648,748
Value of other receiveables (less allowance for doubtful accounts) at beginning of year	2010-12-31	$1,664,687
Other income not declared elsewhere	2010-12-31	$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	2010-12-31	No
Value of net income/loss	2010-12-31	$4,210,122
Value of net assets at end of year (total assets less liabilities)	2010-12-31	$610,032,878
Value of net assets at beginning of year (total assets less liabilities)	2010-12-31	$605,822,756
Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond)	2010-12-31	No
Were any loans by the plan or fixed income obligations due to the plan in default	2010-12-31	No
Were any leases to which the plan was party in default or uncollectible	2010-12-31	No
Investment advisory and management fees	2010-12-31	$22,977
Value of interest in registered invesment companies (eg mutual funds) at end of year	2010-12-31	$289,935,503
Value of interest in registered invesment companies (eg mutual funds) at beginning of year	2010-12-31	$251,055,935
Value of interest in pooled separate accounts at end of year	2010-12-31	$81,131,450
Value of interest in pooled separate accounts at beginning of year	2010-12-31	$78,745,052
Interest on participant loans	2010-12-31	$746,966
Value of interest in common/collective trusts at end of year	2010-12-31	$0
Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year	2010-12-31	$2,435,978
Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year	2010-12-31	$3,938,268
Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year	2010-12-31	$3,938,268
Interest earned from interest bearing cash (including money market accounts and certificates of deposit)	2010-12-31	$358
Value of funds held in insurance company general accounts (unallocated contracts) at end of year	2010-12-31	$0
Net investment gain/loss from registered investment companies (e.g. mutual funds)	2010-12-31	$28,375,181
Net investment gain/loss from pooled separate accounts	2010-12-31	$5,143,481
Net investment gain or loss from common/collective trusts	2010-12-31	$0
Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets	2010-12-31	No
Was there a failure to transmit to the plan any participant contributions	2010-12-31	No
Has the plan failed to provide any benefit when due under the plan	2010-12-31	No
Assets. Invements in employer securities at end of year	2010-12-31	$204,476,605
Assets. Invements in employer securities at beginning of year	2010-12-31	$247,519,821
Contributions received in cash from employer	2010-12-31	$23,690,806
Employer contributions (assets) at end of year	2010-12-31	$12,411,047
Employer contributions (assets) at beginning of year	2010-12-31	$6,998,704
Income. Dividends from common stock	2010-12-31	$6,582,304
Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers	2010-12-31	$57,405,409
Contract administrator fees	2010-12-31	$72,500
Did the plan have assets held for investment	2010-12-31	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	2010-12-31	No
Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC	2010-12-31	No
Aggregate proceeds on sale of assets	2010-12-31	$21,160,077
Aggregate carrying amount (costs) on sale of assets	2010-12-31	$24,557,307
Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d)	2010-12-31	No
Opinion of an independent qualified public accountant for this plan	2010-12-31	Unqualified
Accountancy firm name	2010-12-31	BAKER TILLY VIRCHOW KRAUSE, LLP
Accountancy firm EIN	2010-12-31	390859910
2009 : MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2009 401k financial data
Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities	2009-12-31	$0

Form 5500 Responses for MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN

2018: MDU RESOURCES GROUP, INC. 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	Yes
2018-01-01	Plan funding arrangement – Insurance	Yes
2018-01-01	Plan funding arrangement – Trust	Yes
2018-01-01	Plan benefit arrangement - Trust	Yes
2017: MDU RESOURCES GROUP, INC. 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	Yes
2017-01-01	Plan funding arrangement – Insurance	Yes
2017-01-01	Plan funding arrangement – Trust	Yes
2017-01-01	Plan benefit arrangement - Trust	Yes
2016: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2016 form 5500 responses
2016-01-01	Type of plan entity	Mulitple employer plan
2016-01-01	Submission has been amended	No
2016-01-01	This submission is the final filing	No
2016-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2016-01-01	Plan is a collectively bargained plan	Yes
2016-01-01	Plan funding arrangement – Insurance	Yes
2016-01-01	Plan funding arrangement – Trust	Yes
2016-01-01	Plan benefit arrangement - Trust	Yes
2015: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2015 form 5500 responses
2015-01-01	Type of plan entity	Mulitple employer plan
2015-01-01	Submission has been amended	No
2015-01-01	This submission is the final filing	No
2015-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2015-01-01	Plan is a collectively bargained plan	Yes
2015-01-01	Plan funding arrangement – Insurance	Yes
2015-01-01	Plan funding arrangement – Trust	Yes
2015-01-01	Plan benefit arrangement - Trust	Yes
2014: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2014 form 5500 responses
2014-01-01	Type of plan entity	Mulitple employer plan
2014-01-01	Submission has been amended	No
2014-01-01	This submission is the final filing	No
2014-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2014-01-01	Plan is a collectively bargained plan	Yes
2014-01-01	Plan funding arrangement – Insurance	Yes
2014-01-01	Plan funding arrangement – Trust	Yes
2014-01-01	Plan benefit arrangement - Trust	Yes
2013: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2013 form 5500 responses
2013-01-01	Type of plan entity	Mulitple employer plan
2013-01-01	Submission has been amended	No
2013-01-01	This submission is the final filing	No
2013-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2013-01-01	Plan is a collectively bargained plan	Yes
2013-01-01	Plan funding arrangement – Insurance	Yes
2013-01-01	Plan funding arrangement – Trust	Yes
2013-01-01	Plan benefit arrangement - Trust	Yes
2012: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2012 form 5500 responses
2012-01-01	Type of plan entity	Single employer plan
2012-01-01	Submission has been amended	No
2012-01-01	This submission is the final filing	No
2012-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2012-01-01	Plan is a collectively bargained plan	Yes
2012-01-01	Plan funding arrangement – Insurance	Yes
2012-01-01	Plan funding arrangement – Trust	Yes
2012-01-01	Plan benefit arrangement - Trust	Yes
2011: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2011 form 5500 responses
2011-01-01	Type of plan entity	Single employer plan
2011-01-01	Submission has been amended	No
2011-01-01	This submission is the final filing	No
2011-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2011-01-01	Plan is a collectively bargained plan	No
2011-01-01	Plan funding arrangement – Insurance	Yes
2011-01-01	Plan funding arrangement – Trust	Yes
2011-01-01	Plan benefit arrangement - Trust	Yes
2010: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2010 form 5500 responses
2010-01-01	Type of plan entity	Single employer plan
2010-01-01	Submission has been amended	No
2010-01-01	This submission is the final filing	No
2010-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2010-01-01	Plan is a collectively bargained plan	No
2010-01-01	Plan funding arrangement – Insurance	Yes
2010-01-01	Plan funding arrangement – Trust	Yes
2010-01-01	Plan benefit arrangement - Trust	Yes
2009: MDU RESOURCES GROUP, INC. 401(K) RETIREMENT PLAN 2009 form 5500 responses
2009-01-01	Type of plan entity	Single employer plan
2009-01-01	Submission has been amended	No
2009-01-01	This submission is the final filing	No
2009-01-01	This return/report is a short plan year return/report (less than 12 months)	No
2009-01-01	Plan is a collectively bargained plan	No
2009-01-01	Plan funding arrangement – Insurance	Yes
2009-01-01	Plan funding arrangement – Trust	Yes
2009-01-01	Plan benefit arrangement - Trust	Yes

Insurance Providers Used on plan

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	12975
Insurance policy start date	2018-01-01
Insurance policy end date	2018-12-31
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?	No
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

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	11918
Insurance policy start date	2017-01-01
Insurance policy end date	2017-12-31
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?	No
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

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	11420
Insurance policy start date	2015-01-01
Insurance policy end date	2015-12-31
Are there contracts with allocated funds for individual policies?	No
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?	No
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

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	10706
Insurance policy start date	2014-01-01
Insurance policy end date	2014-12-31
Are there contracts with allocated funds for individual policies?	No
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?	No
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

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	10119
Insurance policy start date	2013-01-01
Insurance policy end date	2013-12-31
Are there contracts with allocated funds for individual policies?	No
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?	No
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

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	10077
Insurance policy start date	2012-01-01
Insurance policy end date	2012-12-31
Are there contracts with allocated funds for individual policies?	No
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?	No
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

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	9975
Insurance policy start date	2011-01-01
Insurance policy end date	2011-12-31
Total amount of commissions paid to insurance broker	USD $0
Total amount of fees paid to insurance company	USD $0
Are there contracts with allocated funds for individual policies?	No
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?	No
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

NEW YORK LIFE INSURANCE COMPANY (National Association of Insurance Commissioners NAIC id number: 66915 )

Policy contract number

30500

Policy instance

Insurance contract or identification number	30500
Number of Individuals Covered	9849
Insurance policy start date	2010-01-01
Insurance policy end date	2010-12-31
Total amount of commissions paid to insurance broker	USD $0
Total amount of fees paid to insurance company	USD $0
Are there contracts with allocated funds for individual policies?	No
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?	No
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

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Company Name:	MDU RESOURCES GROUP, INC.
Employer identification number (EIN):	410423660
NAIC Classification:	221100

Jurisdiction of Incorporation:	Texas Secretary of State
Incorporation Date:	2017-06-12
Company Identification Number:	0802743739
Legal Registered Office Address:	PO BOX 5650 BISMARCK United States of America (USA) 58506