X0306 4 2019-02-19 0 0001667633 Forty Seven, Inc. FTSV 0001743780 Takimoto Chris H C/O FORTY SEVEN, INC. 1490 O'BRIEN DRIVE, SUITE A MENLO PARK CA 94025 0 1 0 0 Chief Medical Officer Common Stock 2019-02-19 4 S 0 2500 15.0485 D 0 D The sale reported in this Form 4 was effected pursuant to a 10b5-1 trading plan. Reflects shares acquired under the Forty Seven, Inc. 2018 Employee Stock Purchase Plan on February 15, 2019. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.91 to $15.55, 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 this footnote. /s/ John T. McKenna, Attorney-in-Fact for Chris H. Takimoto 2019-02-21