X0306 4 2019-05-20 0 0001667633 Forty Seven, Inc. FTSV 0001390798 McCamish Mark Anthony C/O FORTY SEVEN, INC. 1490 O'BRIEN DRIVE, SUITE A MENLO PARK CA 94025 1 1 0 0 President and CEO Common Stock 2019-05-20 4 M 0 15209 4.8825 A 75928 D Common Stock 2019-05-20 4 S 0 15209 12.0748 D 60719 D Common Stock 2019-05-20 4 M 0 1291 4.8825 A 62010 D Common Stock 2019-05-20 4 S 0 1291 12.4555 D 60719 D Stock Option (right to buy) 4.8825 2019-05-20 4 M 0 15209 0.00 D 2027-06-07 Common Stock 15209 362396 D Stock Option (right to buy) 4.8825 2019-05-20 4 M 0 1291 0.00 D 2027-06-07 Common Stock 1291 361105 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $11.38 to $12.36, inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $12.42 to $12.49, inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. 1/4th of the shares subject to the option vested on May 1, 2018 and the balance of the shares subject to the option vest in a series of 36 successive equal monthly installments thereafter, subject to the Reporting Person's continuous service as of each such date. /s/ John T. McKenna, Attorney-in-Fact for Mark A. McCamish 2019-05-22