Twist Bioscience officer executed sell-to-cover of 23,747 shares

Rhea-AI Filing Summary

Insider sale to cover taxes: The Form 4 shows that Patrick John Finn, President and COO of Twist Bioscience Corp (TWST), had 23,747 shares of common stock sold on 10/06/2025 at $32.187 per share. The filing states these sales were mandatory "sell to cover" transactions to meet tax‑withholding obligations tied to vested Performance Stock Units (PSUs) and were not discretionary trades. After the transaction, the reporting person beneficially owned 208,735 shares. The sale was reported on 10/08/2025 and signed by an attorney‑in‑fact.

Positive

• Transaction was non-discretionary and executed to satisfy tax withholding from vested PSUs
• Reporting shows substantial retained ownership with 208,735 shares remaining after the sale

Negative

• Insider sold 23,747 shares, which modestly reduces immediate insider-held shares

Insights

Corporate Insider Transactions Analyst

Mandatory sell-to-cover tax sale reduced holdings by 23,747 shares.

The reported disposition on 10/06/2025 reflects a non-discretionary sale tied to tax withholding for vested PSUs, not an open-market diversification decision. The transaction price was $32.187 and the filing notes the company requires "sell to cover" under its equity plans.

Key near-term items to watch include any future PSU vesting schedules and additional Form 4 filings that would show discretionary sales or further mandatory withholdings; those would modify insider ownership trends over the next vesting cycles.

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^*

Finn Patrick John

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and COO

3. Date of Earliest Transaction (Month/Day/Year)
10/06/2025

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	10/06/2025		S		23,747(1)	D	$32.187	208,735	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

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 Performance Stock Units ("PSUs"). 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.

Remarks:

	/s/ Kendra Fox, as Attorney-in-Fact for Patrick John Finn	10/08/2025
	** 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.

FAQ

What did TWST insider Patrick John Finn report on Form 4?

He reported a sale of 23,747 shares on 10/06/2025 at $32.187 per share to cover tax withholding from vested PSUs.

Was the share sale by the TWST executive discretionary?

No. The filing states the sales were mandated by the issuer's "sell to cover" election under its equity incentive plans and do not represent discretionary trades.

How many shares does the reporting person own after the transaction?

208,735 shares of TWST common stock are reported as beneficially owned following the transaction.

When was the Form 4 filed and who signed it?

The Form 4 was dated and signed on 10/08/2025 by an attorney-in-fact, indicating timely reporting of the 10/06/2025 transaction.

What triggered the sale of shares on TWST Form 4?

Tax withholding obligations associated with the vesting of Performance Stock Units triggered a mandatory "sell to cover" sale.