Sorry, available market cap data for Walmart (WMT) starts on October 1, 1985. Walmart (WMT) has a market capitalization of $731.1B, based on 8.02B shares at a price of $91.19 (down 3% today).

DATE	OPEN	HIGH	LOW	CLOSE	VOLUME
December 31 1980	$0.04	$0.05	$0.04	$0.05	11,443,200
December 30 1980	$0.04	$0.04	$0.04	$0.04	1,036,800
December 29 1980	$0.04	$0.04	$0.04	$0.04	8,217,600
December 26 1980	$0.04	$0.04	$0.04	$0.04	729,600
December 24 1980	$0.04	$0.05	$0.04	$0.04	1,689,600
December 23 1980	$0.04	$0.05	$0.04	$0.04	8,563,200
December 22 1980	$0.04	$0.04	$0.04	$0.04	6,336,000
December 19 1980	$0.04	$0.04	$0.04	$0.04	18,086,400
December 18 1980	$0.04	$0.04	$0.04	$0.04	9,331,200
December 17 1980	$0.04	$0.04	$0.04	$0.04	6,297,600
December 16 1980	$0.04	$0.04	$0.04	$0.04	9,139,200
December 15 1980	$0.04	$0.04	$0.04	$0.04	11,673,600
December 12 1980	$0.04	$0.04	$0.04	$0.04	46,924,800
December 11 1980	$0.04	$0.04	$0.04	$0.04	3,456,000
December 10 1980	$0.04	$0.04	$0.04	$0.04	5,068,800
December 09 1980	$0.04	$0.04	$0.04	$0.04	4,224,000
December 08 1980	$0.04	$0.04	$0.04	$0.04	1,152,000
December 05 1980	$0.04	$0.04	$0.04	$0.04	5,222,400
December 04 1980	$0.04	$0.04	$0.04	$0.04	4,300,800
December 03 1980	$0.04	$0.04	$0.04	$0.04	384,000
December 02 1980	$0.04	$0.04	$0.04	$0.04	3,916,800
December 01 1980	$0.04	$0.04	$0.04	$0.04	9,523,200
November 28 1980	$0.04	$0.04	$0.04	$0.04	34,406,400
November 26 1980	$0.04	$0.04	$0.04	$0.04	998,400
November 25 1980	$0.04	$0.04	$0.04	$0.04	5,529,600