STOCK TITAN

Twist Bioscience (TWST) CAO sells 167 shares in mandated tax sell-to-cover

(Neutral)
(Negative)
Form Type
4

Rhea-AI Filing Summary

Twist Bioscience Corp’s Chief Accounting Officer, Robert F. Werner, sold 167 shares of common stock on 2026-08-03 at $85.3212 per share. According to the company’s equity incentive plans, this mandated “sell to cover” transaction funded tax withholding on vesting Restricted Stock Units and was not discretionary. Following the sale, Werner directly held 46,160 shares.

Positive

  • None.

Negative

  • None.
Insider WERNER ROBERT F.
Role Chief Accounting Officer
Sold 167 shs ($14K)
Type Security Shares Price Value
Sale Common Stock F1 167 $85.3212 $14K
Holdings After Transaction: Common Stock — 46,160 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.
Shares sold 167 shares Common stock sold on 2026-08-03 in a mandated sell-to-cover
Sale price per share $85.3212 per share Price received for the 167 common shares sold
Post-transaction holdings 46,160 shares Directly owned Twist Bioscience common stock after the sale
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
"under its equity incentive plans to require the satisfaction"
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.
tax withholding obligations financial
"sold by the Reporting Person to cover tax withholding obligations"

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google
Add on Google
Learn about SEC filing dates

FAQ

What insider stock transaction did TWST report for Robert F. Werner?

Robert F. Werner, Chief Accounting Officer of Twist Bioscience, sold 167 shares of common stock at $85.3212 per share. The 2026-08-03 sale was a mandated sell-to-cover to satisfy tax withholding on vesting Restricted Stock Units, rather than a discretionary trade.

How many TWST shares does Robert F. Werner hold after this Form 4 sale?

After the reported transaction, Robert F. Werner held 46,160 shares of Twist Bioscience common stock directly. The Form 4 shows only 167 shares sold, executed solely to cover tax withholding obligations from Restricted Stock Unit vesting under the company’s equity incentive plans.

Was the TWST insider sale by Robert F. Werner a discretionary trade?

No. The filing states the 167 shares sold by Robert F. Werner were required to cover tax withholding obligations tied to Restricted Stock Unit vesting. These “sell to cover” transactions are mandated under Twist Bioscience’s equity incentive plans and are not discretionary trades by the officer.

What price did the TWST insider receive for the shares sold?

The reported transaction lists a sale price of $85.3212 per share for the 167 Twist Bioscience shares sold on 2026-08-03. The sale was executed as a sell-to-cover to fund tax withholding on Restricted Stock Units rather than as a voluntary open-market liquidation.

Does the TWST Form 4 mention a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not affirmed, and a pre-arranged trading plan is not cited. Instead, the footnote explains the 167-share sale was mandated under Twist Bioscience’s equity incentive plans solely to satisfy tax withholding from Restricted Stock Unit vesting.
SEC Form 4
FORM 4UNITED 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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Accounting Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/03/2026S167(1)D$85.321246,160D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 Robert F. Werner08/05/2026
** Signature of Reporting PersonDate
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)