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MDU Resources Group Inc. common stock is the subject of a Schedule 13G in which Dimensional Fund Advisors reported beneficial ownership of 10,679,046 shares, or 5.1% of the class, as of September 30, 2026. It reported sole voting power over 10,530,532 shares and sole dispositive power over 10,679,046 shares; shared voting and dispositive power were both zero.
The ownership note states that the reported securities are owned by investment companies, trusts and accounts collectively called the Funds, and that Dimensional Fund Advisors LP disclaims beneficial ownership. The Funds have rights to receive or direct dividends and sale proceeds.
Key Figures
Beneficial ownership:10,679,046 sharesOwnership of class:5.1%Sole voting power:10,530,532 shares+1 more
4 metrics
Beneficial ownership10,679,046 sharesAs of September 30, 2026
Ownership of class5.1%As of September 30, 2026
Sole voting power10,530,532 sharesReported in the ownership disclosure
Sole dispositive power10,679,046 sharesReported in the ownership disclosure
Key Terms
beneficial ownership, Sole power to vote or to direct the vote, Sole power to dispose or to direct the disposition
3 terms
beneficial ownershipfinancial
"Amount beneficially owned: 10,679,046"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
Sole power to vote or to direct the votefinancial
"Sole power to vote or to direct the vote"
Sole power to dispose or to direct the dispositionfinancial
"Sole power to dispose or to direct the disposition"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many MDU shares did Dimensional Fund Advisors report?
Dimensional Fund Advisors reported beneficial ownership of 10,679,046 MDU common shares, or 5.1% of the class, as of September 30, 2026.
Who receives dividends from the MDU shares reported by Dimensional?
The Funds have the right to receive or direct dividends and proceeds from sales of the securities held in their respective accounts. Dimensional Fund Advisors stated that, to its knowledge, no individual Fund's interest exceeds 5% of the class.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
MDU Resources Group Inc
(Name of Issuer)
Common Stock
(Title of Class of Securities)
552690109
(CUSIP Number)
09/30/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
552690109
1
Names of Reporting Persons
Dimensional Fund Advisors LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
10,530,532.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
10,679,046.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
10,679,046.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.1 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
MDU Resources Group Inc
(b)
Address of issuer's principal executive offices:
1200 West Century Avenue, Bismarck, ND 58503
Item 2.
(a)
Name of person filing:
Dimensional Fund Advisors LP
(b)
Address or principal business office or, if none, residence:
6300 Bee Cave Road, Building One, Austin, TX 78746
(c)
Citizenship:
Delaware Limited Partnership
(d)
Title of class of securities:
Common Stock
(e)
CUSIP Number(s):
552690109
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
10,679,046 ** see Note 1 **
** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)
Percent of class:
5.1 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
10,530,532** see Note 1 **
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
10,679,046** see Note 1 **
(iv) Shared power to dispose or to direct the disposition of:
0
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
