Barney David C

4

MDU Resources Group Inc.

02/21/23

4

MDU Resources Group Inc.

02/28/22

4

MDU Resources Group Inc.

02/22/22

4

MDU Resources Group Inc.

02/16/21

4

MDU Resources Group Inc.

05/14/20

4

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02/18/20

4

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02/19/19

4

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02/20/18

4/A

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02/21/17

4

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02/21/17

3

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05/20/13

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