Sorry, available market cap data for MDU Resources (MDU) starts on July 1, 1985. MDU Resources (MDU) has a market capitalization of $4.2B, based on 209.01M shares at a price of $19.97 (down 0.2% today).

DATE	OPEN	HIGH	LOW	CLOSE	VOLUME
December 30 1983	$0.001	$0.001	$0.001	$0.001	181,068
December 29 1983	$0.001	$0.001	$0.001	$0.001	141,126
December 28 1983	$0.001	$0.001	$0.001	$0.001	122,487
December 27 1983	$0.001	$0.001	$0.001	$0.001	114,499
December 23 1983	$0.001	$0.001	$0.001	$0.001	119,824
December 22 1983	$0.001	$0.001	$0.001	$0.001	90,534
December 21 1983	$0.001	$0.001	$0.001	$0.001	53,255
December 20 1983	$0.001	$0.001	$0.001	$0.001	125,150
December 19 1983	$0.001	$0.001	$0.001	$0.001	255,625
December 16 1983	$0.001	$0.001	$0.001	$0.001	74,557
December 15 1983	$0.001	$0.001	$0.001	$0.001	79,883
December 14 1983	$0.001	$0.001	$0.001	$0.001	26,628
December 13 1983	$0.001	$0.001	$0.001	$0.001	133,138
December 12 1983	$0.001	$0.001	$0.001	$0.001	66,569
December 09 1983	$0.001	$0.001	$0.001	$0.001	103,848
December 08 1983	$0.001	$0.001	$0.001	$0.001	138,463
December 07 1983	$0.001	$0.001	$0.001	$0.001	258,288
December 06 1983	$0.001	$0.001	$0.001	$0.001	111,836
December 05 1983	$0.001	$0.001	$0.001	$0.001	191,719
December 02 1983	$0.001	$0.001	$0.001	$0.001	95,859
December 01 1983	$0.001	$0.001	$0.001	$0.001	170,417
November 30 1983	$0.001	$0.001	$0.001	$0.001	95,859
November 29 1983	$0.001	$0.001	$0.001	$0.001	133,138
November 28 1983	$0.001	$0.001	$0.001	$0.001	45,267
November 25 1983	$0.001	$0.001	$0.001	$0.001	34,616