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SC 13G ·Filed Oct 8, 2026

MDU

MDU RESOURCES GROUP INC
NEUTRAL
Impact 3/10
Horizondays Processed18d 19h ago SEC0000354204-26-001079
Passive investor 5%+ stake
Actionable Insight • Neutral

Dimensional Fund Advisors LP filed a Schedule 13G disclosing a 5.1% passive stake in MDU Resources Group Inc as of September 30, 2026. This is an amendment to a prior 13G filing, indicating a continued passive position by a major index-oriented asset manager. The filing is routine for a large passive investor and carries no activist intent.

DirectionNeutral
Confidencehigh
Horizondays
Latest settled — T+5d
MDU ▼ -1.06% at T+5d
NEUTRAL call -1.06% · α vs SPY -0.79% · entry $18.81 → $18.61
Next anchor: T+20d in 9d
Latest observation: T+11 +5.00% FF3 residual α
Entry = T+0 close
Oct 8, 2026
via day close
T+1d
-0.37%
call -0.37% · α -0.97%
$18.74
settled 18d ago
T+5d
-1.06%
call -1.06% · α -0.79%
$18.61
settled 12d ago
T+20d
Pending
in 9d
T+60d
Pending
in 2mo

Price Chart

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Executive Summary

Dimensional Fund Advisors LP filed a Schedule 13G disclosing a 5.1% passive stake in MDU Resources Group Inc as of September 30, 2026. This is an amendment to a prior 13G filing, indicating a continued passive position by a major index-oriented asset manager. The filing is routine for a large passive investor and carries no activist intent.

Key Facts

  • Dimensional Fund Advisors LP disclosed beneficial ownership of 10,679,046 shares of MDU Resources Group Inc common stock.
  • The stake represents 5.1% of shares outstanding as of September 30, 2026.
  • Dimensional Fund Advisors LP is a registered investment adviser and files as a passive investor under Rule 13d-1(b).
  • The filing is an amendment to a prior Schedule 13G, confirming a continued passive position.
  • Dimensional Fund Advisors LP disclaims beneficial ownership of the securities, stating all shares are held by client funds and accounts.

Financial Impact

Passive 5.1% stake valued at approximately $10.7 million based on 10,679,046 shares held.

ownership percentage

Investment Themes

Materials & Mining

Documents Analyzed

This report is based on 3 SEC documents filed with EDGAR.

DocumentAccession Number
SC 13G Filing (Primary)0000354204-26-001079
Document: 0000354204-26-001079-index.html0000354204-26-001079
Document: 0000354204-26-001079.txt0000354204-26-001079
4 reports for MDU
Performance horizon
Filters
Rows
Reports for MDU — sortable, filterable
TypeNow
Oct 15, 2026
11d ago
Press Release
NEUTRAL ★ 1/10
$19.00awaiting T+20—$19.43 (+2.29%)
Oct 8, 2026
18d ago
SC 13G
NEUTRAL ★ 3/10
$18.81awaiting T+20—$19.43 (+3.32%)
May 13, 2026
23w ago
8-K
NEUTRAL ★ 3/10
$22.57 $21.11▼ −6.47%▼ −5.61%$19.43 (−13.89%)
Apr 1, 2026
29w ago
DEFA14A
NEUTRAL ★ 3/10
$21.03 $21.95▲ +4.37%▼ −5.35%$19.43 (−7.58%)
Showing 4 of 4

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Report published Oct 8, 2026