MDU Resources Group, Inc.
MX ˙ BMV ˙ US5526901096
SecurityMX:MDU / MDU Resources Group, Inc.
InstitutionFrontier Capital Management Co Llc
Latest Disclosed Ownership2,506,549 shares
Latest Disclosed Value $ 51,935,695
Frontier Capital Management Co Llc reports 4.18% decrease in ownership of MDU / MDU Resources Group, Inc.

On May 15, 2026 - Frontier Capital Management Co Llc filed a 13F-HR form disclosing ownership of 2,506,549 shares of MDU Resources Group, Inc. (MX:MDU) valued at $51,935,695 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,615,969 shares of MDU Resources Group, Inc.. This represents a change in shares of -4.18% 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)
2026-05-15 2026-03-31 13F MDU RES GROUP COM 552690109 2,506,549 -109,420 -4.18 51,936 1.71 0.5338
2026-02-17 2025-12-31 13F MDU RES GROUP COM 552690109 2,615,969 -376,007 -12.57 51,064 -4.17 0.5419
2025-11-14 2025-09-30 13F MDU RES GROUP COM 552690109 2,991,976 201,162 7.21 53,287 14.54 0.4777
2025-08-14 2025-06-30 13F MDU RES GROUP COM 552690109 2,790,814 460,180 19.74 46,523 18.04 0.4307
2025-05-15 2025-03-31 13F MDU RES GROUP COM 552690109 2,330,634 213,694 10.09 39,411 3.31 0.4310
2025-02-14 2024-12-31 13F MDU RES GROUP COM 552690109 2,116,940 -17,914 -0.84 38,147 -34.81 0.3625
2024-11-14 2024-09-30 13F MDU RES GROUP COM 552690109 2,134,854 -74 -0.00 58,516 9.20 0.5508
2024-08-14 2024-06-30 13F MDU RES GROUP COM 552690109 2,134,928 6,549 0.31 53,587 -0.09 0.5306
2024-05-15 2024-03-31 13F MDU RES GROUP COM 552690109 2,128,379 -13,135 -0.61 53,635 26.49 0.5013
2024-02-14 2023-12-31 13F MDU RES GROUP COM 552690109 2,141,514 67,273 3.24 42,402 4.40 0.4283
2023-11-14 2023-09-30 13F MDU RES GROUP COM 552690109 2,074,241 420,504 25.43 40,614 17.28 0.4464
2023-08-14 2023-06-30 13F MDU RES GROUP COM 552690109 1,653,737 302,075 22.35 34,629 -15.94 0.3318
2023-05-15 2023-03-31 13F MDU RES GROUP COM 552690109 1,351,662 -35,358 -2.55 41,199 -2.10 0.4261
2023-02-14 2022-12-31 13F MDU RES GROUP COM 552690109 1,387,020 -37,904 -2.66 42,082 7.98 0.4583
2022-11-14 2022-09-30 13F MDU RES GROUP COM 552690109 1,424,924 130,508 10.08 38,972 11.55 0.4569
2022-07-20 2022-06-30 13F MDU RES GROUP COM 552690109 1,294,416 15,333 1.20 34,936 2.49 0.4022
2022-04-14 2022-03-31 13F MDU RES GROUP COM 552690109 1,279,083 -43,139 -3.26 34,088 -16.40 0.3087
2022-01-19 2021-12-31 13F MDU RES GROUP COM 552690109 1,322,222 -12,364 -0.93 40,777 2.98 0.3223
2021-10-19 2021-09-30 13F MDU RES GROUP COM 552690109 1,334,586 -35,985 -2.63 39,597 -7.82 0.3112
2021-08-09 2021-06-30 13F MDU RES GROUP COM 552690109 1,370,571 24,008 1.78 42,954 0.91 0.3146
2021-05-13 2021-03-31 13F MDU RES GROUP COM 552690109 1,346,563 -505,157 -27.28 42,565 -12.73 0.3220
2021-01-19 2020-12-31 13F MDU RES GROUP COM 552690109 1,851,720 -71,761 -3.73 48,774 12.70 0.3610
2020-11-16 2020-09-30 13F MDU RES GROUP COM 552690109 1,923,481 63,590 3.42 43,278 4.91 0.3779
2020-07-17 2020-06-30 13F MDU RES GROUP COM 552690109 1,859,891 65,751 3.66 41,252 6.94 0.3651
2020-04-16 2020-03-31 13F MDU RES GROUP COM 552690109 1,794,140 -58,506 -3.16 38,574 -29.92 0.4333
2020-02-14 2019-12-31 13F MDU RES GROUP COM 552690109 1,852,646 -5,950 -0.32 55,042 5.05 0.4066
2019-11-14 2019-09-30 13F MDU RES GROUP COM 552690109 1,858,596 -233,816 -11.17 52,394 -2.95 0.4103
2019-08-14 2019-06-30 13F MDU Resources Group COM 552690109 2,092,412 -145,503 -6.50 53,984 -6.61 0.4072
2019-05-07 2019-03-31 13F MDU Resources Group COM 552690109 2,237,915 82,726 3.84 57,805 12.50 0.4111
2019-01-25 2018-12-31 13F MDU Resources Group COM 552690109 2,155,189 368,396 20.62 51,380 11.93 0.4148
2018-10-30 2018-09-30 13F MDU Resources Group COM 552690109 1,786,793 149,073 9.10 45,903 -2.27 0.2956
2018-08-03 2018-06-30 13F MDU Resources Group COM 552690109 1,637,720 -61,621 -3.63 46,970 -1.85 0.3328
2018-04-30 2018-03-31 13F MDU Resources Group COM 552690109 1,699,341 59,458 3.63 47,853 8.56 0.3483
2018-01-18 2017-12-31 13F MDU Resources Group COM 552690109 1,639,883 -173,150 -9.55 44,080 -6.31 0.3222
2017-10-31 2017-09-30 13F MDU Resources Group COM 552690109 1,813,033 20,260 1.13 47,048 0.16 0.3394
2017-08-04 2017-06-30 13F MDU Resources Group COM 552690109 1,792,773 -5,345 -0.30 46,971 -4.56 0.3430
2017-05-10 2017-03-31 13F MDU Resources Group COM 552690109 1,798,118 48,910 2.80 49,214 -2.21 0.3635
2017-02-03 2016-12-31 13F MDU Resources Group COM 552690109 1,749,208 212,616 13.84 50,325 28.74 0.3870
2016-11-14 2016-09-30 13F MDU Resources Group COM 552690109 1,536,592 87,009 6.00 39,091 12.36 0.3132
2016-08-02 2016-06-30 13F MDU Resources Group COM 552690109 1,449,583 100,095 7.42 34,790 32.48 0.2858
2016-05-04 2016-03-31 13F MDU Resources Group COM 552690109 1,349,488 218,282 19.30 26,261 26.72 0.2090
2016-01-27 2015-12-31 13F MDU Resources Group COM 552690109 1,131,206 313,572 38.35 20,724 47.37 0.1716
2015-10-23 2015-09-30 13F MDU Resources Group COM 552690109 817,634 222,115 37.30 14,063 20.92 0.1183
2015-07-24 2015-06-30 13F MDU Resources Group COM 552690109 595,519 595,519 11,630 0.0835
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.