MDU Resources Group, Inc.
MX ˙ BMV ˙ US5526901096
SecurityMX:MDU / MDU Resources Group, Inc.
InstitutionOppenheimer Asset Management Inc.
Latest Disclosed Ownership151,989 shares
Latest Disclosed Value $ 3,149,212
Oppenheimer Asset Management Inc. reports 3.83% decrease in ownership of MDU / MDU Resources Group, Inc.

On April 23, 2026 - Oppenheimer Asset Management Inc. filed a 13F-HR form disclosing ownership of 151,989 shares of MDU Resources Group, Inc. (MX:MDU) valued at $3,149,212 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 158,043 shares of MDU Resources Group, Inc.. This represents a change in shares of -3.83% 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)
2026-04-23 2026-03-31 13F MDU RES GROUP COM 552690109 151,989 -6,054 -3.83 3,149 2.07 0.0090
2026-02-02 2025-12-31 13F MDU RES GROUP COM 552690109 158,043 135,602 604.26 3,085 673.18 0.0093
2025-11-06 2025-09-30 13F MDU RES GROUP COM 552690109 22,441 -561 -2.44 400 4.18 0.0044
2025-07-31 2025-06-30 13F MDU RES GROUP COM 552690109 23,002 -554 -2.35 383 -3.77 0.0044
2025-04-23 2025-03-31 13F MDU RES GROUP COM 552690109 23,556 -3,301 -12.29 398 -17.60 0.0049
2025-02-05 2024-12-31 13F MDU RES GROUP COM 552690109 26,857 -1,444 -5.10 484 -37.68 0.0059
2024-11-05 2024-09-30 13F MDU RES GROUP COM 552690109 28,301 182 0.65 776 9.93 0.0093
2024-08-08 2024-06-30 13F MDU RES GROUP COM 552690109 28,119 6,249 28.57 706 27.95 0.0090
2024-05-07 2024-03-31 13F MDU RES GROUP COM 552690109 21,870 1,482 7.27 551 36.72 0.0081
2024-02-13 2023-12-31 13F MDU RES GROUP COM 552690109 20,388 377 1.88 404 3.07 0.0056
2023-11-08 2023-09-30 13F MDU RES GROUP COM 552690109 20,011 94 0.47 392 -6.24 0.0060
2023-08-03 2023-06-30 13F MDU RES GROUP COM 552690109 19,917 19,917 417 0.0061
2022-11-14 2022-09-30 13F MDU RES GROUP COM 552690109 0 -9,231 -100.00 0 -100.00
2022-08-08 2022-06-30 13F MDU RES GROUP COM 552690109 9,231 -8,202 -47.05 249 -46.45 0.0042
2022-05-12 2022-03-31 13F MDU RES GROUP COM 552690109 17,433 709 4.24 465 -9.88 0.0066
2022-02-02 2021-12-31 13F MDU RES GROUP COM 552690109 16,724 4,948 42.02 516 47.85 0.0068
2021-11-12 2021-09-30 13F MDU RES GROUP COM 552690109 11,776 -367 -3.02 349 -8.40 0.0050
2021-08-03 2021-06-30 13F MDU RES GROUP COM 552690109 12,143 -5,247 -30.17 381 -30.73 0.0054
2021-05-17 2021-03-31 13F MDU RES GROUP COM 552690109 17,390 630 3.76 550 24.72 0.0085
2021-02-11 2020-12-31 13F MDU RES GROUP COM 552690109 16,760 3,843 29.75 441 51.55 0.0074
2020-11-13 2020-09-30 13F MDU RES GROUP COM 552690109 12,917 -2,646 -17.00 291 -15.65 0.0057
2020-08-11 2020-06-30 13F MDU RES GROUP COM 552690109 15,563 308 2.02 345 5.18 0.0071
2020-05-08 2020-03-31 13F MDU RES GROUP COM 552690109 15,255 7 0.05 328 -27.59 0.0081
2020-02-07 2019-12-31 13F MDU RES GROUP COM 552690109 15,248 -48 -0.31 453 5.10 0.0096
2019-10-31 2019-09-30 13F MDU RES GROUP COM 552690109 15,296 3,629 31.10 431 43.19 0.0096
2019-08-09 2019-06-30 13F MDU RES GROUP COM 552690109 11,667 11,667 301 0.0067
2019-04-24 2019-03-31 13F MDU RES GROUP COM 552690109 0 -399 -100.00 0 -100.00
2019-01-30 2018-12-31 13F MDU RES GROUP COM 552690109 399 399 10 0.0002
2018-02-07 2017-12-31 13F MDU RES GROUP COM 552690109 0 -399 -100.00 0 -100.00
2017-11-14 2017-09-30 13F MDU RES GROUP COM 552690109 399 0 0.00 10 0.00 0.0003
2017-08-09 2017-06-30 13F MDU RES GROUP COM 552690109 399 399 10 0.0003
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.