Twist Bioscience (TWST) officer sells 1,642 shares to cover RSU taxes

Rhea-AI Filing Summary

Twist Bioscience Corp officer Dennis Cho reported an open-market sale of 1,642 shares of Common Stock at $53.257 per share. According to the filing, these shares were sold solely to satisfy tax withholding obligations arising from the vesting of Restricted Stock Units under the company’s equity incentive plans, pursuant to a mandated “sell to cover” election rather than a discretionary trade. After this transaction, Cho directly holds 134,299 shares of Twist Bioscience common stock.

Insider Trade Summary

Net Seller: 1,642 shares ($87,448)

Net Sell 1 txn

Insider Cho Dennis

Role See Remarks

Sold 1,642 shs ($87K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,642	$53.257	$87K

Holdings After Transaction: Common Stock — 134,299 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 1,642 shares Sale price: $53.257 per share Shares owned after: 134,299 shares +1 more

4 metrics

Shares sold 1,642 shares Open-market sale on 2026-05-21

Sale price $53.257 per share Price for 1,642 shares sold

Shares owned after 134,299 shares Direct holdings following transaction

Net shares sold 1,642 shares Net-sell direction per 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

"to cover tax withholding obligations in connection with the vesting"

sell to cover financial

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

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

"the 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.

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^*

Cho Dennis

(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)
	See Remarks

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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	05/21/2026		S		1,642(1)	D	$53.257	134,299	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:

Senior Vice President, Chief Legal Officer & Corporate Secretary

	/s/ Kendra Fox, as Attorney-in-Fact for Dennis Cho	05/26/2026
	** 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 Dennis Cho?

Twist Bioscience reported that officer Dennis Cho sold 1,642 shares of Common Stock. The sale was to cover tax withholding on vested Restricted Stock Units and was required under the company’s equity incentive plans rather than a discretionary trade.

At what price did Dennis Cho’s Twist Bioscience (TWST) shares sell?

Dennis Cho’s 1,642 Twist Bioscience shares were sold at $53.257 per share. The transaction was structured as a mandated “sell to cover” to satisfy tax withholding on RSU vesting, not as an optional open-market sale for portfolio rebalancing.

How many Twist Bioscience (TWST) shares does Dennis Cho hold after this transaction?

Following the sale, Dennis Cho directly holds 134,299 shares of Twist Bioscience common stock. This context shows the 1,642 shares sold for tax withholding represent a small portion of his overall reported ownership position in the company.

Why were Dennis Cho’s Twist Bioscience (TWST) shares sold according to the Form 4?

The filing states the shares were sold to cover tax withholding obligations from Restricted Stock Unit vesting. Twist Bioscience’s equity incentive plans require a “sell to cover” transaction for these taxes, so the sale does not reflect a discretionary trading decision.

Does Dennis Cho’s Twist Bioscience (TWST) Form 4 indicate a discretionary sale?

No. The footnote explains the 1,642 shares were sold under a mandated “sell to cover” arrangement. This means the transaction was executed to fund tax withholding on RSU vesting, rather than a voluntary timing decision by the reporting person.