Were the TWST insider share sales by Robert F. Werner discretionary trades?

The reported TWST share sales were not discretionary. The filing states they were mandated "sell to cover" transactions to satisfy tax withholding obligations arising from vesting Restricted Stock Units under the company’s equity incentive plans.

What is the nature of the 500-share transaction reported for Twist Bioscience (TWST)?

The 500-share transaction is a bona fide gift to a charitable organization. The filing identifies it as a gift transfer coded as a "G" transaction, separate from the tax-driven "sell to cover" share sales linked to Restricted Stock Unit vesting.

Twist Bioscience (TWST) CAO records tax-driven share sales and 500-share gift

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Twist Bioscience Corp's Chief Accounting Officer, Robert F. Werner, reported routine share movements in common stock. On June 8, 2026, he sold a total of 1,359 shares in two open-market transactions at prices of $69.07 and $69.8442 per share.

According to the disclosure, these sales were required to cover tax withholding obligations tied to vesting Restricted Stock Units under the company’s equity plans, and were not discretionary trades. Werner also made a bona fide gift of 500 shares to a charitable organization and continues to hold 47,954 shares directly.

Insider Trade Summary

Net Seller: 1,359 shares ($94,046)

Net Sell 3 txns

Insider WERNER ROBERT F.

Role Chief Accounting Officer

Sold 1,359 shs ($94K)

Type	Security	Shares	Price	Value
Sale	Common Stock	232	$69.8442	$16K
Sale	Common Stock	1,127	$69.07	$78K
Gift	Common Stock	500	$0.00	--

Holdings After Transaction: Common Stock — 47,954 shares (Direct, null)

Footnotes (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. Represents a bona fide gift of shares to a charitable organization.

Key Figures

Tax-related sales: 1,359 shares First sale tranche: 1,127 shares at $69.07 Second sale tranche: 232 shares at $69.8442 +2 more

5 metrics

Tax-related sales 1,359 shares Total common shares sold on June 8, 2026 to cover tax withholding

First sale tranche 1,127 shares at $69.07 Open-market or private transaction on June 8, 2026

Second sale tranche 232 shares at $69.8442 Open-market or private transaction on June 8, 2026

Charitable gift 500 shares Bona fide gift of common stock to a charitable organization

Post-transaction holdings 47,954 shares Common shares directly held by Robert F. Werner after transactions

Key Terms

Restricted Stock Units, sell to cover, equity incentive plans, bona fide gift

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.

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.

bona fide gift financial

"Represents a bona fide gift of shares to a charitable"

A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.

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Form 4 Insider Transactions: What Each Field Means →

06/10/2026 - 04:05 PM

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^*

WERNER ROBERT F.

(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)
	Chief Accounting Officer

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/08/2026		S		232⁽¹⁾	D	$69.8442	47,954	D
Common Stock	06/08/2026		S		1,127	D	$69.07	46,827	D
Common Stock	06/08/2026		G		500⁽²⁾	D	$0	46,327	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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.

2. Represents a bona fide gift of shares to a charitable organization.

Remarks:

	/s/ Kendra Fox, as Attorney-in-Fact for Robert F. Werner	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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Twist Bioscience (TWST) report for its Chief Accounting Officer?

Twist Bioscience’s Chief Accounting Officer Robert F. Werner reported selling 1,359 common shares and gifting 500 shares. The sales occurred on June 8, 2026, in two tranches and were linked to tax withholding on Restricted Stock Unit vesting.

At what prices did the Twist Bioscience (TWST) Chief Accounting Officer sell shares?

Robert F. Werner sold 1,127 Twist Bioscience common shares at $69.07 and 232 shares at $69.8442. Both tax-related sales took place on June 8, 2026, in open-market or private transactions as described in the disclosure.

How many Twist Bioscience (TWST) shares does Robert F. Werner hold after these transactions?

Following the reported transactions, Robert F. Werner directly holds 47,954 Twist Bioscience common shares. This post-transaction balance reflects both the small mandated tax-withholding sales and the separate bona fide gift of 500 shares to a charitable organization.