Twist Bioscience: Leproust proposes $131K share sale

The notice also records a September 17, 2026 sale of 356,546 common shares for $56,330,878.38.

Rhea-AI Filing Summary

Twist Bioscience Corp (TWST) director and officer Emily M. Leproust is named in a Rule 144 notice for a proposed sale of 655 common shares through Fidelity Brokerage Services LLC. The proposed sale has an aggregate market value of $131,000.00 and an approximate sale date of October 1, 2026. The listed prior sales include 356,546 shares for $56,330,878.38 on September 17, 2026.

Key Figures

Common shares proposed for sale: 655 shares Aggregate market value: $131,000.00 Common shares sold: 356,546 shares +1 more

4 metrics

Common shares proposed for sale 655 shares Approximate sale date: October 1, 2026

Aggregate market value $131,000.00 Proposed sale

Common shares sold 356,546 shares September 17, 2026

Sale proceeds $56,330,878.38 Sale dated September 17, 2026

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact

3 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Restricted Stock Vesting"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for Emily M. Leproust"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many TWST shares does Emily M. Leproust propose to sell?

The notice lists 655 common shares for proposed sale, with an aggregate market value of $131,000.00 and an approximate sale date of October 1, 2026. Fidelity Brokerage Services LLC is listed as the broker, and NASDAQ is listed as the exchange.

What recent TWST sale did Emily M. Leproust report?

One listed transaction was a sale of 356,546 common shares on September 17, 2026, for $56,330,878.38. Other listed sales are dated August 3 through September 24, 2026.

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

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Available on EDGAR 10/01/2026 - 04:28 PM Accepted by SEC EDGAR 10/01/2026 - 04:27 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001753655
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Twist Bioscience Corp
SEC File Number	001-38720
Address of Issuer	681 GATEWAY BLVD. SOUTH SAN FRANCISCO CALIFORNIA 94080
Phone	800-719-0671
Name of Person for Whose Account the Securities are To Be Sold	Leproust Emily M.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	655	131000.00	62707424	10/01/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/19/2026	Restricted Stock Vesting	Issuer			100	06/19/2026	Compensation
Common	08/02/2026	Restricted Stock Vesting	Issuer			136	08/02/2026	Compensation
Common	08/20/2026	Restricted Stock Vesting	Issuer			251	08/20/2026	Compensation
Common	09/05/2026	Restricted Stock Vesting	Issuer			68	09/05/2026	Compensation
Common	09/19/2026	Restricted Stock Vesting	Issuer			100	09/19/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	08/03/2026	5101	435223.44
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	08/10/2026	113318	14183062.19
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	08/12/2026	19952	2495508.37
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	08/21/2026	6639	923261.83
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	08/25/2026	41570	6317760.97
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	09/08/2026	2302	282280.22
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	09/17/2026	356546	56330878.38
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	09/21/2026	1687	279183.99
Emily M. Leproust 681 Gateway Blvd South San Francisco CA 94080	Common	09/24/2026	5203	922906.47

144: Remarks and Signature

Remarks
Date of Notice	10/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/15/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Emily M. Leproust
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)