Sorry, available market cap data for International Business Machines (IBM) starts on July 1, 1985. International Business Machines (IBM) has a market capitalization of $244.4B, based on 924.64M shares at a price of $264.36 (up 1.7% yesterday).

DATE	OPEN	HIGH	LOW	CLOSE	VOLUME
December 31 1963	$1.35	$1.37	$1.35	$1.36	1,820,040
December 30 1963	$1.33	$1.35	$1.33	$1.34	1,796,505
December 27 1963	$1.33	$1.34	$1.33	$1.33	1,129,680
December 26 1963	$1.31	$1.32	$1.31	$1.32	541,305
December 24 1963	$1.30	$1.31	$1.30	$1.30	494,235
December 23 1963	$1.30	$1.31	$1.30	$1.30	627,600
December 20 1963	$1.30	$1.30	$1.29	$1.30	470,700
December 19 1963	$1.30	$1.31	$1.30	$1.30	502,080
December 18 1963	$1.30	$1.32	$1.30	$1.30	651,135
December 17 1963	$1.29	$1.30	$1.29	$1.30	470,700
December 16 1963	$1.28	$1.29	$1.28	$1.28	258,885
December 13 1963	$1.28	$1.29	$1.27	$1.28	360,870
December 12 1963	$1.29	$1.30	$1.28	$1.28	251,040
December 11 1963	$1.29	$1.30	$1.29	$1.29	258,885
December 10 1963	$1.30	$1.30	$1.29	$1.29	313,800
December 09 1963	$1.30	$1.31	$1.29	$1.30	643,290
December 06 1963	$1.31	$1.32	$1.30	$1.30	455,010
December 05 1963	$1.30	$1.32	$1.30	$1.31	572,685
December 04 1963	$1.32	$1.32	$1.30	$1.30	658,980
December 03 1963	$1.32	$1.33	$1.31	$1.32	706,050
December 02 1963	$1.31	$1.32	$1.31	$1.32	713,895
November 29 1963	$1.29	$1.31	$1.29	$1.31	713,895
November 27 1963	$1.27	$1.29	$1.27	$1.29	980,625
November 26 1963	$1.25	$1.27	$1.25	$1.27	1,106,145
November 22 1963	$1.25	$1.27	$1.24	$1.25	839,415