MDU Resources Group, Inc.
MX ˙ BMV ˙ US5526901096
SecurityMX:MDU / MDU Resources Group, Inc.
InstitutionWashington Trust Bank
Latest Disclosed Ownership99,619 shares
Latest Disclosed Value $ 2,064,105
Washington Trust Bank ownership in MDU / MDU Resources Group, Inc.

On May 7, 2026 - Washington Trust Bank filed a 13F-HR form disclosing ownership of 99,619 shares of MDU Resources Group, Inc. (MX:MDU) valued at $2,064,105 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 99,619 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)
2026-05-07 2026-03-31 13F MDU RES GROUP COM 552690109 99,619 0 0.00 2,064 6.17 0.1256
2026-02-04 2025-12-31 13F MDU RES GROUP COM 552690109 99,619 -722 -0.72 1,945 8.79 0.1362
2025-10-24 2025-09-30 13F MDU RES GROUP COM 552690109 100,341 0 0.00 1,787 6.88 0.1310
2025-08-06 2025-06-30 13F MDU RES GROUP COM 552690109 100,341 0 0.00 1,673 -1.42 0.1409
2025-04-30 2025-03-31 13F MDU RES GROUP COM 552690109 100,341 0 0.00 1,697 -6.19 0.1700
2025-02-11 2024-12-31 13F MDU RES GROUP COM 552690109 100,341 -528 -0.52 1,808 -34.59 0.1737
2024-10-31 2024-09-30 13F MDU RES GROUP COM 552690109 100,869 0 0.00 2,765 9.21 0.2647
2024-07-29 2024-06-30 13F MDU RES GROUP COM 552690109 100,869 0 0.00 2,532 -0.39 0.2504
2024-05-14 2024-03-31 13F MDU RES GROUP COM 552690109 100,869 0 0.00 2,542 27.24 0.2423
2024-02-14 2023-12-31 13F MDU RES GROUP COM 552690109 100,869 -542 -0.53 1,997 0.60 0.1770
2023-11-06 2023-09-30 13F MDU RES GROUP COM 552690109 101,411 0 0.00 1,986 -6.50 0.2074
2023-08-10 2023-06-30 13F MDU RES GROUP COM 552690109 101,411 0 0.00 2,124 -31.32 0.2168
2023-05-15 2023-03-31 13F MDU RES GROUP COM 552690109 101,411 0 0.00 3,091 102,933.33 0.3307
2023-02-06 2022-12-31 13F MDU RES GROUP COM 552690109 101,411 -291 -0.29 3 -99.89 0.3489
2022-11-16 2022-09-30 13F MDU RES GROUP COM 552690109 101,702 0 0.00 2,781 1.35 0.3535
2022-08-04 2022-06-30 13F MDU RES GROUP COM 552690109 101,702 0 0.00 2,744 1.25 0.3524
2022-05-13 2022-03-31 13F MDU RES GROUP COM 552690109 101,702 0 0.00 2,710 -13.58 0.3135
2022-02-09 2021-12-31 13F MDU RES GROUP COM 552690109 101,702 -17,682 -14.81 3,136 -11.49 0.3033
2021-10-27 2021-09-30 13F MDU RES GROUP COM 552690109 119,384 0 0.00 3,543 -5.32 0.4138
2021-07-28 2021-06-30 13F MDU RES GROUP COM 552690109 119,384 0 0.00 3,742 -0.82 0.4433
2021-04-22 2021-03-31 13F MDU RES GROUP COM 552690109 119,384 0 0.00 3,773 20.01 0.4648
2021-02-08 2020-12-31 13F MDU RES GROUP COM 552690109 119,384 -336 -0.28 3,144 16.75 0.4101
2020-11-12 2020-09-30 13F MDU RES GROUP COM 552690109 119,720 -28,630 -19.30 2,693 -18.15 0.3984
2020-07-29 2020-06-30 13F MDU RES GROUP COM 552690109 148,350 0 0.00 3,290 3.17 0.5233
2020-05-01 2020-03-31 13F MDU RES GROUP COM 552690109 148,350 -5,062 -3.30 3,189 -30.04 0.6118
2020-01-29 2019-12-31 13F MDU RES GROUP COM 552690109 153,412 -1,747 -1.13 4,558 4.21 0.6483
2019-10-29 2019-09-30 13F MDU RES GROUP COM 552690109 155,159 0 0.00 4,374 9.27 0.7157
2019-07-26 2019-06-30 13F MDU RES GROUP COM 552690109 155,159 0 0.00 4,003 -0.12 0.6510
2019-04-09 2019-03-31 13F MDU Resources Group COM 552690109 155,159 5,076 3.38 4,008 12.02 0.6388
2019-02-13 2018-12-31 13F MDU Resources Group COM 552690109 150,083 8,490 6.00 3,578 -1.62 0.4698
2018-11-14 2018-09-30 13F MDU Resources Group COM 552690109 141,593 -5,062 -3.45 3,637 -13.53 0.5402
2018-07-03 2018-06-30 13F MDU Resources Group COM 552690109 146,655 0 0.00 4,206 1.84 0.5857
2018-04-03 2018-03-31 13F MDU Resources Group COM 552690109 146,655 -36 -0.02 4,130 4.74 0.5925
2018-01-03 2017-12-31 13F MDU Resources Group COM 552690109 146,691 3,648 2.55 3,943 6.22 0.5766
2017-10-05 2017-09-30 13F MDU Resources Group COM 552690109 143,043 58,141 68.48 3,712 66.91 0.5888
2017-07-20 2017-06-30 13F MDU Resources Group COM 552690109 84,902 0 0.00 2,224 -4.30 0.4771
2017-04-18 2017-03-31 13F MDU Resources Group COM 552690109 84,902 0 0.00 2,324 -4.87 0.5016
2017-01-17 2016-12-31 13F MDU Resources Group COM 552690109 84,902 -1,267 -1.47 2,443 11.45 0.5507
2016-10-04 2016-09-30 13F MDU Resources Group COM 552690109 86,169 27 0.03 2,192 6.05 0.5272
2016-07-07 2016-06-30 13F MDU Resources Group COM 552690109 86,142 0 0.00 2,067 23.33 0.5351
2016-04-25 2016-03-31 13F MDU Resources Group COM 552690109 86,142 5,062 6.24 1,676 12.86 0.4331
2016-01-21 2015-12-31 13F MDU Resources Group COM 552690109 81,080 -2,768 -3.30 1,485 2.98 0.3234
2015-10-07 2015-09-30 13F MDU Resources Group Common Stock 552690109 83,848 0 0.00 1,442 -11.97 0.3833
2015-07-10 2015-06-30 13F MDU Resources Group Common Stock 552690109 83,848 0 0.00 1,638 -8.44 0.3996
2015-04-17 2015-03-31 13F MDU Resources Group Common Stock 552690109 83,848 1,500 1.82 1,789 -7.55 0.4311
2015-01-15 2014-12-31 13F MDU Resources Group Common Stock 552690109 82,348 -62,460 -43.13 1,935 -51.95 0.5050
2014-11-21 2014-09-30 13F MDU Resources Group Common Stock 552690109 144,808 -28,033 -16.22 4,027 -33.62 1.2635
2014-08-08 2014-06-30 13F MDU Resources Group Common Stock 552690109 172,841 -2,887 -1.64 6,067 0.63 1.2334
2014-05-15 2014-03-31 13F MDU Resources Group Common Stock 552690109 175,728 175,728 6,029 1.2732
2014-02-06 2013-12-31 13F MDU RES GROUP COM 552690109 0 -90,000 -100.00 0 -100.00
2013-11-15 2013-09-30 13F MDU RES GROUP COM 552690109 90,000 90,000 2,517 0.6557
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.