Tax-withholding share sale by Twist Bioscience (TWST) HR executive

Rhea-AI Filing Summary

Twist Bioscience Corp SVP of Human Resources Paula Green reported a small mandated share sale tied to tax withholding. She sold 884 shares of common stock at an average price of $69.8442 per share to cover taxes due on vesting Restricted Stock Units, under a required “sell to cover” election in the company’s equity incentive plans. After this non-discretionary transaction, she directly holds 120,705 shares.

Insider Trade Summary

Net Seller: 884 shares ($61,742)

Net Sell 1 txn

Insider Green Paula

Role SVP of Human Resources

Sold 884 shs ($62K)

Type	Security	Shares	Price	Value
Sale	Common Stock	884	$69.8442	$62K

Holdings After Transaction: Common Stock — 120,705 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 884 shares Average sale price: $69.8442 per share Shares held after transaction: 120,705 shares +1 more

4 metrics

Shares sold 884 shares Open-market sale on 2026-06-08

Average sale price $69.8442 per share Tax-withholding sell-to-cover

Shares held after transaction 120,705 shares Direct ownership following Form 4 sale

Net buy/sell shares -884 shares Net-sell direction in transaction summary

Key Terms

Restricted Stock Units, tax withholding obligations, sell to cover, equity incentive plans

4 terms

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.

tax withholding obligations financial

"shares required to be sold ... to cover tax withholding obligations"

sell to cover financial

"funded by a "sell to cover" transaction and do not represent discretionary trades"

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.

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.

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Form 4 Insider Transactions: What Each Field Means →

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)
06/08/2026

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	06/08/2026		S		884(1)	D	$69.8442	120,705	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	06/10/2026
	** 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)

FAQ

What insider transaction did Twist Bioscience (TWST) report for Paula Green?

Twist Bioscience reported that SVP of Human Resources Paula Green sold 884 common shares. The sale was an automatic “sell to cover” transaction to satisfy tax withholding obligations arising from the vesting of Restricted Stock Units under the company’s equity incentive plans.

Was Paula Green’s Twist Bioscience (TWST) share sale discretionary?

No. The filing states the 884-share sale was mandated to cover tax withholding on vesting Restricted Stock Units. The issuer’s equity incentive plans require a “sell to cover” arrangement, so this transaction does not represent a discretionary trade or market-timing decision.

How many Twist Bioscience (TWST) shares did Paula Green sell and at what price?

Paula Green sold 884 shares of Twist Bioscience common stock at an average price of $69.8442 per share. The transaction was reported as an open-market sale but specifically designated as a tax-withholding “sell to cover” related to RSU vesting.

How many Twist Bioscience (TWST) shares does Paula Green hold after the Form 4 transaction?

After the reported transaction, Paula Green directly holds 120,705 shares of Twist Bioscience common stock. This context shows the 884 shares sold for tax withholding represent a small portion of her overall direct equity position with the company.

What is a “sell to cover” transaction in the Twist Bioscience (TWST) filing?

A “sell to cover” transaction automatically sells enough shares to pay required tax withholding when Restricted Stock Units vest. In this case, Twist Bioscience’s equity incentive plans mandate that tax obligations be satisfied through such sales rather than separate cash payments.