On December 31, 1990, Microsoft (MSFT) had a market capitalization of $4.9B, based on 7.53B shares at a price of $0.65.

microsoft market cap 1990
DATE CLOSE VOLUME OUTSTANDING MARKET CAP
December 31 1990 $0.65 23,702,400 7,526,666,700 $4,872,011,354.91
December 28 1990 $0.65 20,268,000 7,526,666,700 $4,856,205,354.84
December 27 1990 $0.64 22,629,600 7,526,666,700 $4,839,646,688.10
December 26 1990 $0.65 16,214,400 7,526,666,700 $4,856,205,354.84
December 24 1990 $0.65 13,550,400 7,526,666,700 $4,872,011,354.91
December 21 1990 $0.65 33,472,800 7,526,666,700 $4,904,376,021.72
December 20 1990 $0.65 46,994,400 7,526,666,700 $4,887,817,354.98
December 19 1990 $0.64 34,264,800 7,526,666,700 $4,847,173,354.80
December 18 1990 $0.65 51,876,000 7,526,666,700 $4,872,011,354.91
December 17 1990 $0.64 27,288,000 7,526,666,700 $4,790,723,354.55
December 14 1990 $0.63 48,636,000 7,526,666,700 $4,766,638,021.11
December 13 1990 $0.63 50,709,600 7,526,666,700 $4,710,188,020.86
December 12 1990 $0.62 71,560,800 7,526,666,700 $4,693,629,354.12
December 11 1990 $0.62 61,768,800 7,526,666,700 $4,669,544,020.68
December 10 1990 $0.64 55,526,400 7,526,666,700 $4,790,723,354.55
December 07 1990 $0.64 81,921,600 7,526,666,700 $4,807,282,021.29
December 06 1990 $0.64 108,201,600 7,526,666,700 $4,839,646,688.10
December 05 1990 $0.65 68,630,400 7,526,666,700 $4,872,011,354.91
December 04 1990 $0.64 54,547,200 7,526,666,700 $4,823,088,021.36
December 03 1990 $0.64 68,241,600 7,526,666,700 $4,782,444,021.18
November 30 1990 $0.62 72,165,600 7,526,666,700 $4,677,823,354.05
November 29 1990 $0.61 65,865,600 7,526,666,700 $4,613,094,020.43
November 28 1990 $0.61 77,623,200 7,526,666,700 $4,555,891,353.51
November 27 1990 $0.62 63,417,600 7,526,666,700 $4,653,738,020.61
November 26 1990 $0.60 47,577,600 7,526,666,700 $4,548,364,686.81
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