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GAMCO INVESTORS, INC. ET AL
> MDU
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | MDU RESOURCES GROUP INC | MDU | 20,100 | 20,100 | 420,894,000 | 420,894,000 | $20,940.00 |
| 12/31/2014 | MDU RESOURCES GROUP INC | MDU | 0 | -8,000 | 0 | -222,000 | |
| 09/30/2014 | MDU RESOURCES GROUP INC | MDU | 8,000 | 0 | 222,000 | -59,000 | $27.75 |
| 06/30/2014 | MDU RESOURCES GROUP INC | MDU | 8,000 | 0 | 281,000 | 7,000 | $35.13 |
| 03/31/2014 | MDU RESOURCES GROUP INC | MDU | 8,000 | 0 | 274,000 | 30,000 | $34.25 |
| 12/31/2013 | MDU RESOURCES GROUP INC | MDU | 8,000 | 8,000 | 244,000 | 244,000 | $30.50 |
| 09/30/2013 | MDU RESOURCES GROUP INC | MDU | 8,000 | 8,000 | 224,000 | 224,000 | $28.00 |
| 06/30/2013 | MDU RESOURCES GROUP INC | MDU | 10,125 | 0 | 262,000 | 9,000 | $25.88 |
| 03/31/2013 | MDU RESOURCES GROUP INC | MDU | 10,125 | 0 | 253,000 | 38,000 | $24.99 |
| 12/31/2012 | MDU RESOURCES GROUP INC | MDU | 10,125 | 10,125 | 215,000 | 215,000 | $21.23 |
| 03/31/2011 | MDU RESOURCES GROUP INC | MDU | 0 | -30,000 | 0 | -608,000 | |
| 12/31/2010 | MDU RESOURCES GROUP INC | MDU | 30,000 | 0 | 608,000 | 9,000 | $20.27 |
| 09/30/2010 | MDU RESOURCES GROUP INC | MDU | 30,000 | 0 | 599,000 | 58,000 | $19.97 |
| 06/30/2010 | MDU RESOURCES GROUP INC | MDU | 30,000 | 30,000 | 541,000 | 541,000 | $18.03 |
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