Twist Bioscience CEO sells shares for taxes

Twist Bioscience Corp Chief Executive Officer Emily M. Leproust reported selling 2,423 shares of common stock on 2026-03-06 at an average price of $46.426 per share.

Rhea-AI Filing Summary

Twist Bioscience Corp Chief Executive Officer Emily M. Leproust reported selling 2,423 shares of common stock on 2026-03-06 at an average price of $46.426 per share. After this transaction, she directly holds 860,629 shares.

According to the disclosure, these shares were sold to cover tax withholding obligations triggered by the vesting of restricted stock units, under a mandated "sell to cover" arrangement, rather than as discretionary trades. She also continues to hold employee stock options, including an award exercisable for 64,950 shares of common stock at an exercise price of $67.8500 per share expiring on 2030-08-31.

Insider Trade Summary

Net Seller: 2,423 shares

Net Sell 6 txns

Insider Leproust Emily M.

Role Chief Executive Officer

Sold 2,423 shs ($112K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,423	$46.426	$112K
holding	Employee Stock Option (right to buy)	--	--	--
holding	Employee Stock Option (right to buy)	--	--	--
holding	Employee Stock Option (right to buy)	--	--	--
holding	Employee Stock Option (right to buy)	--	--	--
holding	Employee Stock Option (right to buy)	--	--	--

Holdings After Transaction: Common Stock — 860,629 shares (Direct); Employee Stock Option (right to buy) — 64,950 contracts (Direct)

Footnotes (6)

1. F1. Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of Restricted Stock Units. These sales are mandated by the Issuer's election under its equity incentive plans to require the satisfaction of a tax withholding obligation to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.
2. F2. The option is immediately exercisable. 25% of the shares subject to the option vested on September 1, 2016 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.
3. F3. 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.
4. F4. 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.
5. F5. 25% of the shares subject to the option vested on October 24, 2020, 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.
6. F6. Represents performance stock options granted to the reporting person on September 1, 2020, that vested and became exercisable on December 19, 2022 as a result of the reporting person having met the applicable performance criteria.

FAQ

What did Twist Bioscience (TWST) CEO Emily Leproust report on this Form 4?

Emily M. Leproust reported selling 2,423 shares of Twist Bioscience common stock on March 6, 2026, at an average price of $46.426 per share. Following the transaction, she directly holds 860,629 shares of the company’s common stock.

Why did the Twist Bioscience (TWST) CEO sell 2,423 shares?

The 2,423 shares were sold to cover tax withholding obligations tied to vesting restricted stock units. The sale was mandated under Twist Bioscience’s equity incentive plans as a required “sell to cover” transaction, rather than a discretionary open-market decision by the CEO.

How many Twist Bioscience (TWST) shares does the CEO hold after the sale?

After the March 6, 2026 sale, CEO Emily Leproust directly holds 860,629 shares of Twist Bioscience common stock. This filing shows the updated ownership position following a tax-related sale connected to restricted stock unit vesting obligations.

At what price were the Twist Bioscience (TWST) shares sold by the CEO?

The 2,423 Twist Bioscience shares were sold at an average price of $46.426 per share. The transaction was reported as common stock sold to satisfy tax withholding obligations, rather than a discretionary trade initiated for portfolio management reasons.

What stock options does the Twist Bioscience (TWST) CEO continue to hold?

The CEO continues to hold employee stock options, including a grant with an exercise price of $67.8500 per share, expiring August 31, 2030, covering 64,950 underlying shares of Twist Bioscience common stock, in addition to her direct common stock holdings.

Was the Twist Bioscience (TWST) CEO’s share sale part of a routine tax withholding?

Yes. The filing states the sale represents shares required to be sold to cover tax withholding from restricted stock unit vesting. Twist Bioscience’s equity plans mandate using a “sell to cover” transaction, so the sale was not a discretionary trade by the CEO.

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Accepted by SEC EDGAR 03/10/2026 - 04:05 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Leproust Emily M.

(Last) (First) (Middle)

C/O TWIST BIOSCIENCE CORPORATION

681 GATEWAY BLVD.

(Street)

SOUTH SAN FRANCISCO CA 94080

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Twist Bioscience Corp [ TWST ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/06/2026		S		2,423(1)	D	$46.426	860,629	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	$5.95							(2)	09/28/2025	Common Stock	0		0	D
Employee Stock Option (right to buy)	$8.82							(3)	09/28/2027	Common Stock	0		150,879	D
Employee Stock Option (right to buy)	$26.66							(4)	11/18/2028	Common Stock	0		266,539	D
Employee Stock Option (right to buy)	$23.33							(5)	10/23/2029	Common Stock	0		131,290	D
Employee Stock Option (right to buy)	$67.85							12/19/2022	08/31/2030	Common Stock	64,950		64,950(6)	D

Explanation of Responses:

1. Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of Restricted Stock Units. These sales are mandated by the Issuer's election under its equity incentive plans to require the satisfaction of a tax withholding obligation to be funded by a "sell to cover" transaction and do not represent discretionary trades by the Reporting Person.

2. The option is immediately exercisable. 25% of the shares subject to the option vested on September 1, 2016 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.

3. 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.

4. 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.

5. 25% of the shares subject to the option vested on October 24, 2020, 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.

6. Represents performance stock options granted to the reporting person on September 1, 2020, that vested and became exercisable on December 19, 2022 as a result of the reporting person having met the applicable performance criteria.

Remarks:

	/s/ Kendra Fox, as Attorney-in-Fact for Emily M. Leproust	03/10/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.