Zymeworks (ZYME) insider plans Rule 144 sale of 128,548 shares

Rhea-AI Filing Summary

Zymeworks Inc. insider plans to sell up to 128,548 shares of common stock through Morgan Stanley Smith Barney on or about 02/13/2026 on Nasdaq, with an aggregate market value of $2,978,457.16. These shares relate mainly to an option exercise for 117,255 shares, vesting of 10,834 restricted stock units, and purchase of 459 shares under an employee stock purchase plan, all acquired in early 2026. Shares of common stock outstanding were 74,836,534 as of the time referenced, which serves as a baseline figure for the company’s capital structure.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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 Smith Barney 1 New York Plaza, 38th Floor New York NY 10004	128548	2978457.16	74836534	02/13/2026	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	02/13/2026	Exercise of options	Issuer			117255	02/13/2026	Exercise and sell to cover
Common Stock	01/12/2026	Vesting of Restricted Stock Units	Issuer			10834	01/12/2026	Compensation
Common Stock	01/06/2026	Purchased pursuant to Employee Stock Purchase Plan	Issuer			459	01/06/2026	Cash payment pursuant to Employee Stock Purchase Plan

* 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
Leone Patterson c/o Zymeworks Inc. 108 Patriot Drive, Suite A Middletown DE 19709	Common Stock	01/12/2026	6832	154905.35

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the ZYME Form 144 filing disclose about planned share sales?

The notice shows a plan to sell 128,548 Zymeworks common shares. The planned sale, routed through Morgan Stanley Smith Barney on Nasdaq, has an aggregate market value of $2,978,457.16 and is targeted for approximately 02/13/2026, subject to market conditions and Rule 144 requirements.

How many Zymeworks (ZYME) shares are outstanding in this Form 144?

The document lists 74,836,534 Zymeworks common shares outstanding. This figure provides a baseline for understanding the company’s overall equity capitalization relative to the 128,548 shares that are planned for sale under this specific Rule 144 notice.

How were the ZYME shares being sold under Rule 144 originally acquired?

The shares were acquired through options, RSUs, and an employee plan. Specifically, 117,255 shares came from option exercise, 10,834 from vested restricted stock units, and 459 from purchases under an employee stock purchase plan, all during January and February 2026.

Which broker is handling the planned ZYME share sale in the notice?

Morgan Stanley Smith Barney is listed as the broker. The address provided is 1 New York Plaza, 38th Floor, New York, NY 10004, and the shares are expected to be sold on the Nasdaq exchange, subject to applicable Rule 144 conditions.

What prior Zymeworks (ZYME) share sales are disclosed in the last 3 months?

The notice reports a prior sale of 6,832 common shares. Leone Patterson sold 6,832 Zymeworks common shares on 01/12/2026, with gross proceeds of $154,905.35, as part of the required three‑month sale history disclosure under Rule 144.

Who is named as seller in the recent ZYME share transaction history?

Leone Patterson is named as a recent seller of ZYME shares. The address is given as c/o Zymeworks Inc., 108 Patriot Drive, Suite A, Middletown, DE 19709, tied to the 6,832-share common stock sale on 01/12/2026 with $154,905.35 in gross proceeds.