Twist Bioscience (TWST) HR chief’s share sale is tax-driven

Rhea-AI Filing Summary

Twist Bioscience Corp (TWST) reported that officer Paula Green, SVP of Human Resources, had 1,360 shares of common stock sold on 2026-08-21 at $139.066 per share. According to the company’s equity incentive plan, this was a mandatory “sell to cover” transaction to satisfy tax withholding on vesting RSUs, not a discretionary trade. After this tax-related sale, Green directly holds 117,921 shares of Twist Bioscience common stock.

Insider Trade Summary

Net Seller: 1,360 shares

Net Sell 1 txn

Insider Green Paula

Role SVP of Human Resources

Sold 1,360 shs ($189K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	1,360	$139.066	$189K

Holdings After Transaction: Common Stock — 117,921 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: 1,360 shares of Common Stock Sale price per share: $139.066 per share Shares held after transaction: 117,921 shares

3 metrics

Shares sold 1,360 shares of Common Stock Tax-related sale on 2026-08-21 to cover withholding on vesting RSUs

Sale price per share $139.066 per share Price for the 1,360 shares sold on 2026-08-21

Shares held after transaction 117,921 shares Direct holdings of Paula Green following the reported sale

Key Terms

sell to cover, Restricted Stock Units, equity incentive plans

3 terms

sell to cover financial

"require the satisfaction of a tax withholding obligation to be funded by a "sell to cover" transaction"

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

"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

"mandated by the Issuer's election under its equity incentive plans"

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

What insider transaction did TWST disclose for Paula Green?

Twist Bioscience disclosed that Paula Green had 1,360 shares of common stock sold on 2026-08-21 at $139.066 per share. The sale was to cover tax withholding obligations from vested Restricted Stock Units under the company’s equity incentive plans.

Was Paula Green’s TWST stock sale a discretionary trade?

No. The filing states the sale was mandated by Twist Bioscience’s equity incentive plans as a “sell to cover” transaction to fund tax withholding on vesting RSUs and does not represent discretionary trades by Paula Green.

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

After the tax-related sale, Paula Green directly holds 117,921 shares of Twist Bioscience common stock. This figure is reported as the total number of shares following the transaction in the Form 4.

What price was received per TWST share in Paula Green’s reported sale?

The reported sale price was $139.066 per share for the 1,360 shares of Twist Bioscience common stock sold on 2026-08-21 in the mandatory tax withholding transaction.

Why were TWST shares sold in connection with Paula Green’s RSUs?

The shares were sold to cover tax withholding obligations arising from the vesting of Restricted Stock Units. Twist Bioscience’s equity incentive plans require tax withholding to be funded through a “sell to cover” transaction in such cases.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/25/2026 - 04:05 PM Accepted by SEC EDGAR 08/25/2026 - 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^*

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)
08/21/2026

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	08/21/2026		S		1,360(1)	D	$139.066	117,921	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	08/25/2026
	** 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)