Sorry, available market cap data for McKesson (MCK) starts on April 4, 1994. McKesson (MCK) has a market capitalization of $92.6B, based on 120.2M shares at a price of $770.31 (up 0.7% today).

DATE	OPEN	HIGH	LOW	CLOSE	VOLUME
December 31 1992	$15.09	$15.31	$15.09	$15.22	179,600
December 30 1992	$15.13	$15.18	$15.04	$15.09	124,400
December 29 1992	$15.13	$15.18	$15.04	$15.18	207,400
December 28 1992	$15.18	$15.22	$15.09	$15.22	119,000
December 24 1992	$15.13	$15.13	$15.04	$15.13	174,000
December 23 1992	$15.18	$15.27	$15.13	$15.13	144,400
December 22 1992	$15.13	$15.27	$15.13	$15.27	93,200
December 21 1992	$15.22	$15.36	$15.13	$15.22	91,000
December 18 1992	$15.22	$15.27	$15.13	$15.27	270,400
December 17 1992	$15.00	$15.13	$15.00	$15.09	125,000
December 16 1992	$15.13	$15.18	$15.00	$15.00	164,200
December 15 1992	$15.13	$15.36	$15.09	$15.18	240,800
December 14 1992	$14.91	$15.13	$14.87	$15.13	91,600
December 11 1992	$14.96	$14.96	$14.87	$14.91	160,400
December 10 1992	$15.04	$15.09	$14.78	$15.04	212,000
December 09 1992	$15.18	$15.18	$14.87	$15.04	150,200
December 08 1992	$15.27	$15.27	$15.22	$15.27	68,400
December 07 1992	$15.40	$15.45	$15.27	$15.31	63,000
December 04 1992	$15.22	$15.49	$15.13	$15.49	124,200
December 03 1992	$15.22	$15.36	$15.04	$15.22	1,299,600
December 02 1992	$15.18	$15.22	$15.04	$15.18	374,600
December 01 1992	$15.18	$15.36	$15.13	$15.27	78,400
November 30 1992	$15.13	$15.40	$15.13	$15.27	367,600
November 27 1992	$15.13	$15.27	$15.09	$15.13	29,000
November 25 1992	$15.36	$15.36	$15.13	$15.13	70,000