X0306 4 2020-07-08 0001581280 Twist Bioscience Corp TWST 0001753670 Banyai William C/O TWIST BIOSCIENCE CORPORATION 681 GATEWAY BLVD. SOUTH SAN FRANCISCO CA 94080 true true false false See Remarks Common Stock 2020-07-08 4 S false 957 50.4419 D 539635 D Common Stock 2020-07-08 4 S false 4200 52.4533 D 535435 D Common Stock 2020-07-08 4 S false 12734 52.9709 D 522701 D Common Stock 2020-07-08 4 S false 6309 54.1538 D 516392 D Common Stock 2020-07-08 4 S false 800 55.0360 D 515592 D The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on May 23, 2019. Represents the weighted average sales price per share. The shares sold at prices ranging from $50.02 to $50.95 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 $51.66 to $52.65 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 $52.66 to $53.65 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 $53.68 to $54.62 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 $54.74 to $55.34 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. Senior Vice President of Advanced Development and General Manager of Data Storage /s/ William Solis, as Attorney-in-Fact for William Banyai 2020-07-10