Twist Bioscience legal chief sells 1,598 shares

Twist Bioscience Corp (TWST) reported an insider transaction by Dennis Cho, Senior Vice President, Chief Legal Officer & Corporate Secretary.

Rhea-AI Filing Summary

Twist Bioscience Corp (TWST) reported an insider transaction by Dennis Cho, Senior Vice President, Chief Legal Officer & Corporate Secretary. On 2026-08-21, he sold 1,598 shares of common stock at $139.066 per share. A footnote states these shares were sold under a mandated "sell to cover" arrangement to satisfy tax withholding obligations upon vesting of Restricted Stock Units, and are not discretionary trades. Following this transaction, Cho directly held 74,063 shares of Twist Bioscience common stock.

Insider Trade Summary

Net Seller: 1,598 shares

Net Sell 1 txn

Insider Cho Dennis

Role See Remarks

Sold 1,598 shs ($222K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	1,598	$139.066	$222K

Holdings After Transaction: Common Stock — 74,063 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: 1,598 shares of Common Stock Sale price per share: $139.066 per share Shares owned after transaction: 74,063 shares of Common Stock +1 more

4 metrics

Shares sold 1,598 shares of Common Stock Sale on 2026-08-21 to cover tax withholding obligations

Sale price per share $139.066 per share Price for the 1,598-share sale on 2026-08-21

Shares owned after transaction 74,063 shares of Common Stock Direct holdings reported following the sale

Net insider share change 1,598 shares sold (net-sell) transactionSummary netBuySellShares for this Form 4

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"

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

"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 report for Dennis Cho?

Twist Bioscience reported that Dennis Cho sold 1,598 shares of common stock on 2026-08-21 at $139.066 per share. The company states the sale was to cover tax withholding obligations related to vesting Restricted Stock Units under its equity incentive plans.

Was the Dennis Cho sale of TWST stock a discretionary trade?

No. A footnote explains the 1,598 shares were sold to cover tax withholding obligations from Restricted Stock Unit vesting under a mandated "sell to cover" election in Twist Bioscience’s equity incentive plans and does not represent a discretionary trade by Dennis Cho.

How many TWST shares does Dennis Cho hold after this transaction?

After the 1,598-share tax-related sale, Dennis Cho directly holds 74,063 shares of Twist Bioscience common stock. This post-transaction holding is reported as the total shares beneficially owned following the transaction.

What price was received in the reported TWST insider sale?

The reported sale by Dennis Cho of 1,598 TWST shares on 2026-08-21 was executed at a price of $139.066 per share, characterized as a sale in an open market or private transaction, and linked to tax withholding for RSU vesting.

Is the reported TWST insider sale under a Rule 10b5-1 trading plan?

No. The Rule 10b5-1 checkbox is not marked as being pursuant to a trading plan, and the footnote instead attributes the sale to a mandated "sell to cover" transaction for tax withholding on Restricted Stock Unit vesting.

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

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Available on EDGAR 08/25/2026 - 04:06 PM EDT Accepted by SEC EDGAR 08/25/2026 - 04:05 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^*

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)
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		1,598(1)	D	$139.066	74,063	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	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)