Zymeworks officer proposes $349K share sale

The shares are identified as coming from restricted stock unit vesting, with Morgan Stanley Wealth Management Canada listed as broker and Nasdaq as the exchange.

Rhea-AI Filing Summary

Zymeworks Inc. officer Adam Schayowitz reported a proposed sale of 13,832 common shares, with an aggregate market value of $349,396.32. The approximate sale date is October 9, 2026; Morgan Stanley Wealth Management Canada is listed as broker, and Nasdaq as the exchange. The shares are identified as originating from vesting of restricted stock units.

Key Figures

Common shares proposed for sale: 13,832 shares Aggregate market value: $349,396.32 Approximate sale date: October 9, 2026

3 metrics

Common shares proposed for sale 13,832 shares Approximate sale date: October 9, 2026

Aggregate market value $349,396.32 Proposed sale

Approximate sale date October 9, 2026 Proposed sale

Key Terms

Rule 144, Restricted Stock Units, Vesting of Award

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 Units financial

"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.

Vesting of Award financial

"Vesting of Award"

FAQ

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

How many Zymeworks (ZYME) shares did Adam Schayowitz propose to sell?

Adam Schayowitz reported a proposed sale of 13,832 Zymeworks common shares, with an aggregate market value of $349,396.32. The approximate sale date is October 9, 2026.

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

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Available on EDGAR 10/09/2026 - 11:17 AM Accepted by SEC EDGAR 10/09/2026 - 11:16 AM 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	0002127119
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	Zymeworks Inc.
SEC File Number	001-41535
Address of Issuer	108 Patriot Drive, Suite A Middletown DELAWARE 19709
Phone	604-764-7904
Name of Person for Whose Account the Securities are To Be Sold	Adam Schayowitz
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

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 Stock	Morgan Stanley Wealth Management Canada 140 4th Ave. SW, Suite 2740 Calgary A0 T2P 3N3	13832	349396.32	70959241	10/09/2026	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 Stock	10/09/2026	Vesting of Restricted Stock Units	Issuer			13832	10/09/2026	Vesting of Award

* 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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	10/09/2026
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	Adam Schayowitz
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)