X0306 4 2020-09-16 0001581280 Twist Bioscience Corp TWST 0001753672 Green Paula C/O TWIST BIOSCIENCE CORPORATION 681 GATEWAY BLVD. SOUTH SAN FRANCISCO CA 94080 false true false false VP of Human Resources Common Stock 2020-09-16 4 M false 17843 5.95 A 46458 D Common Stock 2020-09-16 4 S false 15663 63.3280 D 30795 D Common Stock 2020-09-16 4 S false 2180 63.8412 D 28615 D Common Stock 2020-09-16 4 M false 9145 8.82 A 37760 D Common Stock 2020-09-16 4 S false 9145 63.3154 D 28615 D Employee Stock Option (right to buy) 5.95 2020-09-16 4 M false 17843 0 D 2026-03-21 Common Stock 17843 17843 D Employee Stock Option (right to buy) 8.82 2020-09-16 4 M false 9145 0 D 2027-09-28 Common Stock 9145 3398 D Represents the weighted average sales price per share. The shares sold at prices ranging from $62.72 to $63.71 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. Represents the weighted average sales price per share. The shares sold at prices ranging from $63.72 to $64.01 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. Represents the weighted average sales price per share. The shares sold at prices ranging from $63.32 to $63.40 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. The option is immediately exercisable. 25% of the shares subject to the option vested on March 21, 2017 and 1/48th of the shares subject to the option vest on each monthly anniversary thereafter, subject to the Reporting Person's continuous service through each vesting date. The option is immediately exercisable. 10% of the shares subject to the option vested on September 28, 2017, 15% of the shares subject to the option vested on September 28, 2018, and 1/48th of the shares subject to the option vest on each monthly anniversary thereafter, subject to the Reporting Person's continuous service through each vesting date. /s/ William Solis, as Attorney-in-Fact for Paula Green 2020-09-18