Zymeworks Inc. — Director's Dealing 2025

Jan 7, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Zymeworks Inc. (ZYME)
CIK: 0001937653
Period of Report: 2025-01-06

Reporting Person: Galbraith Kenneth (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-01-06	Common Stock	M	47666	—	Acquired	71428	Direct
2025-01-06	Common Stock	S	23885	$14.9241	Disposed	47543	Direct
2025-01-06	Common Stock	M	66666	—	Acquired	114209	Direct
2025-01-06	Common Stock	S	33406	$14.9241	Disposed	80803	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-01-06	Restricted Stock Unit	$	M	47666	Disposed		Common Stock (47666)	Direct
2025-01-06	Restricted Stock Unit	$	M	66666	Disposed		Common Stock (66666)	Direct

Footnotes

F1: Represents shares of common stock issued upon vesting of one third of the restricted stock units ("RSUs") granted on January 5, 2023.

F2: Represents shares of common stock sold to cover tax withholding obligations and other applicable fees in connection with the vesting of RSUs pursuant to mandatory "sell to cover" provisions contained in the Reporting Person's applicable RSU grant agreement, and does not represent a discretionary sale by the Reporting Person. The Reporting Person did not sell or otherwise dispose of any of the shares reported on this Form 4 for any reason other than to cover required taxes and fees.

F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $14.44 to $15.14, inclusive. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

F4: Represents shares of common stock issued upon vesting of one third of the RSUs granted on January 5, 2024.

F5: Each RSU represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.

F6: The RSUS were granted on January 5, 2023 and vest in three equal annual installments beginning on the first anniversary of January 5, 2023.

F7: The RSUS were granted on January 5, 2024 and vest in three equal annual installments beginning on the first anniversary of January 5, 2024.