X0306 4/A 2017-02-21 2017-02-22 0 0001082923 STAMPS.COM INC STMP 0000949119 MILLER LLOYD I III 3300 SOUTH DIXIE HIGHWAY SUITE 1-365 WEST PALM BEACH FL 33405 1 0 0 0 Common Stock 2017-02-21 4 S 0 20250 134.00 D 64665 I By Milfam II L.P. This sale was executed pursuant to a pre-arranged trading plan compliant with Rule 10b5-1. The price in Column 4 is a weighted average price. The prices actually paid ranged from $133.00 to $135.00 per share. The reporting person will provide the Issuer, any security holder of the Issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. This filing shall not be deemed an admission that the reporting person is, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the beneficial owner of any equity securities covered by this filing. Due to a mathematical error, the amount of securities beneficially owned following reported transaction was inadvertently listed as 105,165 instead of 64,665. /s/ Paul N. Silverstein Attorney-in-fact 2017-02-27