Patrick Weiss - 19 May 2021 Form 4 Insider Report for Twist Bioscience Corp (TWST)

Role: Chief Operating Officer
Signature: /s/ William Solis, as Attorney-in-Fact for Patrick Weiss
Issuer symbol: TWST
Transactions as of: 19 May 2021
Net transactions value: -$341,677
Form type: 4
Filing time: 21 May 2021, 17:52:21 UTC
Next filing: 24 May 2021
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	TWST	Common Stock	Options Exercise	$18,557	+2,104	+4%	$8.82	54,308	19 May 2021	Direct
transaction	TWST	Common Stock	Options Exercise	$52,627	+1,974	+3.6%	$26.66	56,282	19 May 2021	Direct
transaction	TWST	Common Stock	Options Exercise	$20,692	+827	+1.5%	$25.02	57,109	19 May 2021	Direct
transaction	TWST	Common Stock	Sale	$433,553	-4,905	-8.6%	$88.39	52,204	19 May 2021	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	TWST	Employee Stock Option (right to buy)	Options Exercise	$0	-2,104	-17%	$0.000000	10,521	19 May 2021	Common Stock	2,104	$8.82	Direct	F2
transaction	TWST	Employee Stock Option (right to buy)	Options Exercise	$0	-1,974	-3.1%	$0.000000	61,194	19 May 2021	Common Stock	1,974	$26.66	Direct	F3
transaction	TWST	Employee Stock Option (right to buy)	Options Exercise	$0	-827	-3.1%	$0.000000	25,648	19 May 2021	Common Stock	827	$25.02	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on December 15, 2020.
F2	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.
F3	20% of the shares subject to the option vested and became exercisable on October 31, 2019 and 1/60th of the shares subject to the option vest and become exercisable on each monthly anniversary thereafter, subject to the Reporting Person's continuous service through each vesting date.
F4	25% of the shares subject to the option vested and became exercisable on October 24, 2020 and 1/48th of the shares subject to the option vest and become exercisable on each monthly anniversary thereafter, subject to the Reporting Person's continuous service through each vesting date.