Twist Bioscience Corp

Rule 10b5-1 Trading Plans

On May 7, 2025, Dennis Cho, the Company's Chief Legal Officer and Corporate Secretary, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act (a “10b5-1 Plan”). Mr. Cho’s 10b5-1 Plan provides for the potential sale of up to 31,945 shares of the Company’s common stock and will expire on the earlier of May 15, 2026 or the date when all shares under Mr. Cho’s 10b5-1 Plan are sold.

On May 8, 2025, Adam Laponis, the Company's Chief Financial Officer, adopted a 10b5-1 Plan. Mr. Laponis’ 10b5-1 Plan provides for the potential sale of up to 24,000 shares of the Company’s common stock and will expire on the earlier of August 20, 2026 or the date when all shares under Mr. Laponis’ 10b5-1 Plan are sold.

On May 13, 2025, Patrick Finn, the Company's President & Chief Operating Officer, adopted a 10b5-1 Plan. Mr. Finn’s 10b5-1 Plan provides for the potential sale of up to 97,496 shares of the Company’s common stock and will expire on the earlier of May 13, 2026 or the date when all shares under Mr. Finn’s 10b5-1 Plan are sold.

On May 27, 2025, Emily M. Leproust, the Company's Chief Executive Officer, adopted a 10b5-1 Plan. Dr. Leproust’s 10b5-1 Plan provides for the potential sale of up to 458,276 shares of the Company’s common stock and will expire on the earlier of September 16, 2026 or the date when all shares under Dr. Leproust’s 10b5-1 Plan are sold.