MDU Resources Group, Inc.
MX ˙ BMV ˙ US5526901096
SecurityMX:MDU / MDU Resources Group, Inc.
InstitutionMassmutual Trust Co Fsb/adv
Latest Disclosed Ownership79 shares
Latest Disclosed Value $ 1,637
Massmutual Trust Co Fsb/adv reports 58.85% decrease in ownership of MDU / MDU Resources Group, Inc.

On April 13, 2026 - Massmutual Trust Co Fsb/adv filed a 13F-HR form disclosing ownership of 79 shares of MDU Resources Group, Inc. (MX:MDU) valued at $1,637 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 7, 2026 disclosing 192 shares of MDU Resources Group, Inc.. This represents a change in shares of -58.85% 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)
2026-04-13 2026-03-31 13F MDU Resources Group Common / Ordinary Stock 552690109 79 -113 -58.85 2 -66.67 0.0000
2026-01-07 2025-12-31 13F MDU Resources Group Common / Ordinary Stock 552690109 192 0 0.00 4 0.00 0.0001
2025-10-22 2025-09-30 13F MDU Resources Group Common / Ordinary Stock 552690109 192 113 143.04 3 200.00 0.0001
2025-07-09 2025-06-30 13F MDU Resources Group Common / Ordinary Stock 552690109 79 0 0.00 1 0.00 0.0000
2025-04-01 2025-03-31 13F MDU Resources Group Common / Ordinary Stock 552690109 79 0 0.00 1 0.00 0.0000
2025-01-16 2024-12-31 13F MDU Resources Group Common / Ordinary Stock 552690109 79 34 75.56 1 0.00 0.0000
2024-10-02 2024-09-30 13F MDU Resources Group Common / Ordinary Stock 552690109 45 17 60.71 1 0.0000
2024-07-02 2024-06-30 13F MDU Resources Group Common / Ordinary Stock 552690109 28 0 0.00 1 0.0000
2024-04-09 2024-03-31 13F MDU Resources Group Common / Ordinary Stock 552690109 28 0 0.00 1 0.0000
2024-01-03 2023-12-31 13F MDU Resources Group Common / Ordinary Stock 552690109 28 -1,342 -97.96 1 -100.00 0.0000
2023-10-04 2023-09-30 13F MDU Resources Group Common / Ordinary Stock 552690109 1,370 170 14.17 27 4.00 0.0010
2023-08-02 2023-06-30 13F MDU Resources Group Common / Ordinary Stock 552690109 1,200 55 4.80 25 -26.47 0.0009
2023-04-11 2023-03-31 13F MDU Resources Group Common / Ordinary Stock 552690109 1,145 0 0.00 35 0.0013
2023-01-06 2022-12-31 13F MDU Resources Group Common / Ordinary Stock 552690109 1,145 0 0.00 0 0.0014
2022-10-07 2022-09-30 13F MDU Resources Group Common / Ordinary Stock 552690109 1,145 0 0.00 0 0.0014
2022-07-07 2022-06-30 13F MDU Resources Group Common / Ordinary Stock 552690109 1,145 0 0.00 0 0.0013
2022-04-08 2022-03-31 13F MDU Resources Group Common / Ordinary Stock 552690109 1,145 28 2.51 0 0.0012
2022-02-09 2021-12-31 13F MDU Resources Group Common / Ordinary Stock 552690109 1,117 -252 -18.41 0 0.0013
2021-11-12 2021-09-30 13F MDU Resources Group Common / Ordinary Stock 552690109 1,369 252 22.56 0 0.0017
2021-08-16 2021-06-30 13F MDU Resources Group Common / Ordinary Stock 552690109 1,117 1,117 0 0.0015
2020-05-15 2020-03-31 13F MDU Resources Group Common / Ordinary Stock 552690109 0 -340 -100.00 0 -100.00
2020-05-15 2019-12-31 13F MDU Resources Group Common / Ordinary Stock 552690109 340 -523 -60.60 10 -56.52 0.0006
2018-03-01 2017-12-31 13F/A-1 MDU Resources Group Common / Ordinary Stock 552690109 863 863 153.82 23 130.00 0.0019
2016-05-10 2016-03-31 13F MDU RESOURCES GROUP common 552690109 0 0 0 0.0000
2015-11-04 2015-09-30 13F MDU RESOURCES GROUP common 552690109 0 -394 -100.00 0 -100.00
2015-07-29 2015-06-30 13F MDU RESOURCES GROUP common 552690109 394 394 14 0.0031
2014-11-04 2014-09-30 13F MDU RESOURCES GROUP COMMON STOCK 552690109 0 -394 -100.00 0 -100.00
2014-07-09 2014-06-30 13F MDU RESOURCES GROUP COMMON STOCK 552690109 394 394 14 0.0055
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.