MDU Resources Group, Inc.
MX ˙ BMV ˙ US5526901096
SecurityMX:MDU / MDU Resources Group, Inc.
InstitutionRobeco Institutional Asset Management B.V.
Latest Disclosed Ownership25,002 shares
Latest Disclosed Value $ 518,042
Robeco Institutional Asset Management B.V. ownership in MDU / MDU Resources Group, Inc.

On April 21, 2026 - Robeco Institutional Asset Management B.V. filed a 13F-HR form disclosing ownership of 25,002 shares of MDU Resources Group, Inc. (MX:MDU) valued at $518,042 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 25,002 shares of MDU Resources Group, Inc.. This represents a change in shares of 0.00% during the quarter.

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)
2026-04-21 2026-03-31 13F MDU RES GROUP COM 552690109 25,002 0 0.00 518 6.15 0.0007
2026-01-23 2025-12-31 13F MDU RES GROUP COM 552690109 25,002 -44,444 -64.00 488 -60.52 0.0007
2025-10-22 2025-09-30 13F MDU RES GROUP COM 552690109 69,446 0 0.00 1,237 6.83 0.0018
2025-07-18 2025-06-30 13F MDU RES GROUP COM 552690109 69,446 0 0.00 1,158 -1.45 0.0019
2025-04-23 2025-03-31 13F MDU RES GROUP COM 552690109 69,446 9,846 16.52 1,174 9.41 0.0023
2025-01-23 2024-12-31 13F MDU RES GROUP COM 552690109 59,600 0 0.00 1,074 -34.29 0.0020
2024-10-29 2024-09-30 13F MDU RES GROUP COM 552690109 59,600 0 0.00 1,634 9.23 0.0032
2024-07-23 2024-06-30 13F MDU RES GROUP COM 552690109 59,600 -18,096 -23.29 1,496 -23.61 0.0032
2024-04-24 2024-03-31 13F MDU RES GROUP COM 552690109 77,696 -15,001 -16.18 1,958 6.65 0.0043
2024-02-14 2023-12-31 13F/A-1 MDU RES GROUP COM 552690109 92,697 275 0.30 1,835 1.44 0.0044
2024-02-08 2023-12-31 13F MDU RES GROUP COM 552690109 92,214 -208 93 0.0174
2023-10-24 2023-09-30 13F MDU RES GROUP COM 552690109 92,422 92,422 1,810 0.0048
2022-12-01 2022-03-31 13F/A-1 MDU RES GROUP COM 552690109 0 -87,602 -100.00 0 -100.00
2022-04-25 2022-03-31 13F MDU RES GROUP COM 552690109 0 -87,602 0
2022-12-01 2021-12-31 13F/A-1 MDU RES GROUP COM 552690109 87,602 -507,625 -85.28 2,702 -84.70 0.0058
2022-01-31 2021-12-31 13F MDU RES GROUP COM 552690109 87,602 -507,625 2,702 0.0057
2022-12-01 2021-09-30 13F/A-1 MDU RES GROUP COM 552690109 595,227 86,536 17.01 17,659 10.76 0.0392
2021-10-20 2021-09-30 13F MDU RES GROUP COM 552690109 595,227 86,536 17,659 0.0387
2022-12-01 2021-06-30 13F/A-1 MDU RES GROUP COM 552690109 508,691 92,028 22.09 15,943 21.06 0.0353
2021-07-28 2021-06-30 13F MDU RES GROUP COM 552690109 508,691 92,028 15,943 0.0349
2022-12-01 2021-03-31 13F/A-1 MDU RES GROUP COM 552690109 416,663 -42,748 -9.30 13,170 8.82 0.0325
2021-04-23 2021-03-31 13F MDU RES GROUP COM 552690109 416,663 -42,748 13,170 0.0320
2022-12-01 2020-12-31 13F/A-1 MDU RES GROUP COM 552690109 459,411 -97,243 -17.47 12,102 -3.37 0.0318
2021-01-28 2020-12-31 13F MDU RES GROUP COM 552690109 459,411 -97,243 12,102 0.0314
2021-01-19 2020-09-30 13F/A-1 MDU RES GROUP COM 552690109 556,654 50,164 9.90 12,524 11.50 0.0387
2020-10-29 2020-09-30 13F MDU RES GROUP COM 552690109 556,654 50,164 12,524 38,678.1881
2021-01-19 2020-06-30 13F/A-1 MDU RES GROUP COM 552690109 506,490 226,656 81.00 11,232 86.70 0.0381
2020-07-20 2020-06-30 13F MDU RES GROUP COM 552690109 506,490 226,656 11,232 38,112.1794
2021-01-19 2020-03-31 13F/A-1 MDU RES GROUP COM 552690109 279,834 261,045 1,389.35 6,016 980.07 0.0241
2020-04-30 2020-03-31 13F MDU RES GROUP COM 552690109 279,834 261,045 6,016 24,113.4847
2021-01-19 2019-12-31 13F/A-1 MDU RES GROUP COM 552690109 18,789 14,398 327.90 557 349.19 0.0018
2020-02-06 2019-12-31 13F MDU RES GROUP COM 552690109 18,789 14,398 557 1,781.5217
2021-01-19 2019-09-30 13F/A-1 MDU RES GROUP COM 552690109 4,391 0 0.00 124 9.73 0.0004
2019-10-17 2019-09-30 13F MDU RES GROUP COM 552690109 4,391 0 124 437.1510
2021-01-19 2019-06-30 13F/A-1 MDU RES GROUP COM 552690109 4,391 0 0.00 113 0.00 0.0004
2019-07-19 2019-06-30 13F MDU RES GROUP COM 552690109 4,391 0 113 398.4676
2021-01-19 2019-03-31 13F/A-1 MDU RES GROUP COM 552690109 4,391 0 0.00 113 7.62 0.0004
2019-05-02 2019-03-31 13F MDU RES GROUP COM 552690109 4,391 0 113 414.8958
2021-01-19 2018-12-31 13F/A-1 MDU RES GROUP COM 552690109 4,391 0 0.00 105 -7.08 0.0005
2019-02-08 2018-12-31 13F MDU RES GROUP COM 552690109 4,391 0 105 470.6573
2021-01-19 2018-09-30 13F/A-1 MDU RES GROUP COM 552690109 4,391 0 0.00 113 -10.32 0.0004
2018-10-25 2018-09-30 13F MDU RES GROUP COM 552690109 4,391 0 113
2021-01-19 2018-06-30 13F/A-1 MDU RES GROUP COM 552690109 4,391 0 0.00 126 1.61 0.0006
2018-08-03 2018-06-30 13F MDU RES GROUP COM 552690109 4,391 0 126
2021-01-19 2018-03-31 13F/A-1 MDU RES GROUP COM 552690109 4,391 0 0.00 124 5.08 0.0006
2018-05-07 2018-03-31 13F MDU RES GROUP COM 552690109 4,391 0 124 579.8900
2021-01-19 2017-12-31 13F/A-1 MDU RES GROUP COM 552690109 4,391 4,391 118 0.0006
2018-01-25 2017-12-31 13F MDU RES GROUP COM 552690109 4,391 4,391 118 610.2766
2021-01-19 2017-09-30 13F/A-1 MDU RES GROUP COM 552690109 0 -287,018 -100.00 0 -100.00
2021-01-19 2017-06-30 13F/A-1 MDU RES GROUP COM 552690109 287,018 -5,253 -1.80 7,520 -5.99 0.0484
2017-08-07 2017-06-30 13F MDU RES GROUP COM 552690109 287,018 -5,253 7,520 48,961.2563
2021-01-19 2017-03-31 13F/A-1 MDU RES GROUP COM 552690109 292,271 248,831 572.82 7,999 540.43 0.0533
2017-05-15 2017-03-31 13F MDU RES GROUP COM 552690109 292,271 248,831 7,999 53,128.8749
2017-02-09 2016-12-31 13F MDU RES GROUP COM 552690109 43,440 43,440 1,249 0.0098
2015-02-12 2014-12-31 13F MDU RES GROUP COM 552690109 0 -8,636 -100.00 0 -100.00
2014-11-10 2014-09-30 13F MDU RES GROUP COM 552690109 8,636 -21,480 -71.32 240 -77.27 0.0017
2014-08-13 2014-06-30 13F MDU RES GROUP COM 552690109 30,116 23,089 328.58 1,056 338.17 0.0076
2014-05-07 2014-03-31 13F MDU RES GROUP COM 552690109 7,027 0 0.00 241 12.09 0.0018
2014-02-04 2013-12-31 13F MDU RES GROUP COM 552690109 7,027 5,127 269.84 215 305.66 0.0018
2013-11-12 2013-09-30 13F MDU RES GROUP COM 552690109 1,900 0 0.00 53 8.16 0.0005
2013-08-27 2013-06-30 13F MDU Resources Group COM 552690109 1,900 1,900 49 0.0005
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.