MDU Resources Group, Inc.
MX ˙ BMV ˙ US5526901096
SecurityMX:MDU / MDU Resources Group, Inc.
InstitutionWellington Management Group Llp
Latest Disclosed Ownership64,798 shares
Latest Disclosed Value $ 1,342,614
Wellington Management Group Llp ownership in MDU / MDU Resources Group, Inc.

On May 15, 2026 - Wellington Management Group Llp filed a 13F-HR form disclosing ownership of 64,798 shares of MDU Resources Group, Inc. (MX:MDU) valued at $1,342,614 USD as of March 31, 2026. The entity filed a previous 13F-HR on May 16, 2022 disclosing 0 shares of MDU Resources Group, Inc..

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F MDU RES GROUP COM 552690109 64,798 64,798 1,343 0.0000
2022-05-16 2022-03-31 13F MDU RES GROUP COM 552690109 0 -10,835 -100.00 0 -100.00
2022-02-11 2021-12-31 13F MDU RES GROUP COM 552690109 10,835 0 0.00 334 4.05 0.0001
2021-11-15 2021-09-30 13F MDU RES GROUP COM 552690109 10,835 0 0.00 321 -5.59 0.0001
2021-08-16 2021-06-30 13F MDU RES GROUP COM 552690109 10,835 -999 -8.44 340 -9.09 0.0001
2021-05-17 2021-03-31 13F MDU RES GROUP COM 552690109 11,834 -10,975 -48.12 374 -37.67 0.0001
2021-02-12 2020-12-31 13F MDU RES GROUP COM 552690109 22,809 -343 -1.48 600 15.16 0.0001
2020-11-16 2020-09-30 13F MDU RES GROUP COM 552690109 23,152 23,152 521 0.0001
2020-08-14 2020-06-30 13F MDU RES GROUP COM 552690109 0 -19,759 -100.00 0 -100.00
2020-05-14 2020-03-31 13F MDU RES GROUP COM 552690109 19,759 -40,221 -67.06 425 -76.16 0.0001
2020-02-11 2019-12-31 13F MDU RES GROUP COM 552690109 59,980 59,980 1,783 0.0004
2019-11-13 2019-09-30 13F MDU RES GROUP COM 552690109 0 -10,347 -100.00 0 -100.00
2019-08-14 2019-06-30 13F MDU RES GROUP COM 552690109 10,347 0 0.00 267 0.00 0.0001
2019-05-15 2019-03-31 13F MDU RES GROUP COM 552690109 10,347 -113,557 -91.65 267 -90.96 0.0001
2019-02-14 2018-12-31 13F MDU RES GROUP COM 552690109 123,904 103,129 496.41 2,954 453.18 0.0007
2018-11-14 2018-09-30 13F MDU RES GROUP COM 552690109 20,775 20,775 534 0.0001
2018-05-15 2018-03-31 13F MDU RES GROUP COM 552690109 0 -17,609 -100.00 0 -100.00
2018-02-13 2017-12-31 13F MDU RES GROUP COM 552690109 17,609 -9,566 -35.20 473 -32.91 0.0001
2017-11-13 2017-09-30 13F MDU RES GROUP COM 552690109 27,175 27,175 705 0.0002
2017-05-11 2017-03-31 13F MDU RES GROUP COM 552690109 0 -16,410 -100.00 0 -100.00
2017-02-14 2016-12-31 13F MDU RES GROUP COM 552690109 16,410 344 2.14 472 15.40 0.0001
2016-11-14 2016-09-30 13F MDU RES GROUP COM 552690109 16,066 16,066 0.00 409 0.0001
2016-05-13 2016-03-31 13F MDU RES GROUP COM 552690109 0 -26,413 -100.00 0 -100.00
2016-02-12 2015-12-31 13F MDU RES GROUP COM 552690109 26,413 -1,904,953 -98.63 484 -98.54 0.0001
2015-11-16 2015-09-30 13F MDU RES GROUP COM 552690109 1,931,366 -249,702 -11.45 33,220 -22.01 0.0093
2015-08-14 2015-06-30 13F MDU RES GROUP COM 552690109 2,181,068 2,181,068 0.00 42,596 0.0110
2014-11-14 2014-09-30 13F MDU RES GROUP COM 552690109 0 -18,063 -100.00 0 -100.00
2014-08-14 2014-06-30 13F MDU RES GROUP COM 552690109 18,063 7,790 75.83 634 80.11 0.0002
2014-05-15 2014-03-31 13F MDURESGROUP COM 552690109 10,273 10,273 352 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.