Twist Bioscience HR chief sells 907 shares

Twist Bioscience’s SVP of Human Resources executed a small, non-discretionary share sale to cover tax withholding on vested RSUs.

Rhea-AI Filing Summary

Twist Bioscience Corp (TWST) reported an insider tax-related sale by Paula Green, its SVP of Human Resources. On September 8, 2026, she sold 907 shares of common stock at $122.624 per share. According to the company, this sale was a mandatory "sell to cover" for tax withholding on vesting Restricted Stock Units and was not a discretionary trade. After the transaction, she held 117,014 shares directly.

Insider Trade Summary

Net Seller: 907 shares

Net Sell 1 txn

Insider Green Paula

Role SVP of Human Resources

Sold 907 shs ($111K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	907	$122.624	$111K

Holdings After Transaction: Common Stock — 117,014 shares (Direct)

Footnotes (1)

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.

Key Figures

Shares sold: 907 shares Sale price per share: $122.624 per share Shares held after transaction: 117,014 shares +1 more

4 metrics

Shares sold 907 shares Common stock sold by Paula Green on September 8, 2026

Sale price per share $122.624 per share Price for the 907 shares of Twist Bioscience common stock

Shares held after transaction 117,014 shares Direct holdings of Paula Green after the September 8, 2026 sale

Net shares sold in filing 907 shares Net sell direction for this Form 4

Key Terms

sell to cover, Restricted Stock Units, equity incentive plans

3 terms

sell to cover financial

"to be funded by a "sell to cover" transaction and do not"

Sell to cover is when a person who receives company stock through options or awards sells just enough shares immediately to pay required taxes, exercise costs, or fees, keeping the rest. Think of it like cashing part of a bonus to cover the tax bill so you can keep the remainder. For investors, it can create predictable small selling pressure and slightly change the number of shares actually held by insiders without increasing long‑term dilution.

Restricted Stock Units financial

"tax withholding obligations in connection with the vesting of Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

equity incentive plans financial

"Issuer's election under its equity incentive plans to require"

Equity incentive plans are company programs that pay employees, executives, or directors with company stock, stock options, or share units instead of or in addition to cash, aiming to align their interests with shareholders—like giving team members a stake in the house they help build. For investors this matters because such plans can motivate better company performance but also dilute existing ownership and increase reported compensation costs, so they affect future earnings, voting power, and share value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did TWST disclose for Paula Green?

The filing reports that Paula Green, SVP of Human Resources, sold 907 shares of Twist Bioscience common stock on September 8, 2026 at $122.624 per share in a tax-related transaction.

Why did the TWST insider sell 907 shares?

The company states the 907 shares were sold to cover tax withholding obligations arising from the vesting of Restricted Stock Units, under a mandated “sell to cover” election in its equity incentive plans.

Were the TWST insider’s share sales discretionary trades?

No. The filing explains these sales were mandated by the issuer under its equity incentive plans as a “sell to cover” tax-withholding mechanism and do not represent discretionary trades by Paula Green.

How many TWST shares does Paula Green hold after the transaction?

Following the September 8, 2026 sale, Paula Green directly holds 117,014 shares of Twist Bioscience common stock, as reported in the Form 4.

Was a Rule 10b5-1 trading plan used in this TWST Form 4?

The document-level checkbox for Rule 10b5-1 is not checked, and the footnote describes the sale as a mandatory “sell to cover” for tax withholding, rather than as part of a Rule 10b5-1 trading plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/10/2026 - 04:00 PM EDT Accepted by SEC EDGAR 09/10/2026 - 04:00 PM EDT 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^*

Green Paula

(Last) (First) (Middle)

C/O TWIST BIOSCIENCE CORPORATION

681 GATEWAY BLVD.

(Street)

SOUTH SAN FRANCISCO CALIFORNIA 94080

(City) (State) (Zip)

UNITED STATES

(Country)

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)
	SVP of Human Resources

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/08/2026

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

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

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

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	09/08/2026		S		907(1)	D	$122.624	117,014	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 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.

Remarks:

	/s/ Kendra Fox, as Attorney-in-Fact for Paula Green	09/10/2026
	** 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.
* Form 4: SEC 1474 (03-26)