On December 31, 1999, Amazon (AMZN) had a market capitalization of $25.7B, based on 6.76B shares at a price of $3.81.

amazon market cap in 1999
DATE CLOSE VOLUME OUTSTANDING MARKET CAP
December 31 1999 $3.81 145,411,998 6,756,400,000 $25,716,885,320.00
December 30 1999 $3.95 185,099,997 6,756,400,000 $26,708,724,840.00
December 29 1999 $4.18 118,253,998 6,756,400,000 $28,207,970,000.00
December 28 1999 $4.12 206,079,997 6,756,400,000 $27,806,639,840.00
December 27 1999 $4.06 330,389,955 6,756,400,000 $27,405,985,320.00
December 23 1999 $4.50 258,247,996 6,756,400,000 $30,403,800,000.00
December 22 1999 $4.88 118,397,998 6,756,400,000 $33,000,960,160.00
December 21 1999 $4.99 190,115,997 6,756,400,000 $33,740,110,320.00
December 20 1999 $4.85 211,073,997 6,756,400,000 $32,768,540,000.00
December 17 1999 $4.70 119,029,998 6,756,400,000 $31,776,024,840.00
December 16 1999 $4.74 140,047,998 6,756,400,000 $32,051,010,320.00
December 15 1999 $4.83 202,595,997 6,756,400,000 $32,599,630,000.00
December 14 1999 $4.78 202,085,997 6,756,400,000 $32,304,375,320.00
December 13 1999 $5.13 173,049,998 6,756,400,000 $34,626,550,000.00
December 10 1999 $5.33 298,433,976 6,756,400,000 $36,041,340,160.00
December 09 1999 $5.18 827,049,988 6,756,400,000 $35,006,935,320.00
December 08 1999 $4.43 257,303,996 6,756,400,000 $29,918,014,840.00
December 07 1999 $4.30 134,525,998 6,756,400,000 $29,073,464,840.00
December 06 1999 $4.39 183,929,997 6,756,400,000 $29,643,705,000.00
December 03 1999 $4.33 222,977,997 6,756,400,000 $29,242,374,840.00
December 02 1999 $4.45 190,767,997 6,756,400,000 $30,086,924,840.00
December 01 1999 $4.25 213,201,997 6,756,400,000 $28,714,700,000.00
November 30 1999 $4.25 268,543,996 6,756,400,000 $28,735,644,840.00
November 29 1999 $4.52 360,589,995 6,756,400,000 $30,551,765,160.00
November 26 1999 $4.66 229,751,997 6,756,400,000 $31,459,825,320.00
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