Zymeworks (ZYME) executive reports significant option and RSU awards

Rhea-AI Filing Summary

Zymeworks Inc. disclosed initial equity holdings for executive Adam Schayowitz. He holds stock options covering 167,000 shares of common stock with an exercise price of $16.92 per share, expiring on October 8, 2035. These options were granted on October 9, 2025 and vest 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments thereafter.

Schayowitz also holds 111,111 restricted stock units (RSUs) granted on October 9, 2025. These RSUs vest in three equal annual installments beginning October 9, 2026. Each RSU represents the contingent right to receive one share of Zymeworks common stock upon vesting.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Schayowitz Adam

Role See Remarks

Type	Security	Shares	Price	Value
holding	Stock Option (Right to Buy)	--	--	--
holding	Restricted Stock Unit	--	--	--
holding	No securities are beneficially owned	--	--	--

Holdings After Transaction: Stock Option (Right to Buy) — 167,000 shares (Direct); Restricted Stock Unit — 111,111 shares (Direct); No securities are beneficially owned — 0 shares (Direct)

Footnotes (1)

1. Stock option granted October 9, 2025. Stock options vest as follows: (i) 25% of underlying shares of common stock on first anniversary of grant date and (ii) remainder of underlying shares of common stock in 36 equal monthly installments on last day of month following first anniversary of grant date. Restricted stock units ("RSUs") granted October 9, 2025; vest in three equal annual installments beginning October 9, 2026. Each RSU represents the contingent right to receive, upon vesting of the RSU, one share of common stock.

Key Figures

Stock options underlying shares: 167,000 shares Option exercise price: $16.92 per share Option expiration: October 8, 2035 +2 more

5 metrics

Stock options underlying shares 167,000 shares Stock Option (Right to Buy) on common stock

Option exercise price $16.92 per share Exercise price for stock options expiring October 8, 2035

Option expiration October 8, 2035 Expiration date of stock options on common stock

RSU underlying shares 111,111 shares Restricted Stock Units granted October 9, 2025

RSU vesting start October 9, 2026 First vesting date for RSUs in three equal annual installments

Key Terms

Stock Option (Right to Buy), Restricted Stock Unit, vest, underlying shares of common stock, +1 more

5 terms

Stock Option (Right to Buy) financial

"security_title: Stock Option (Right to Buy)"

Restricted Stock Unit financial

"security_title: Restricted Stock Unit"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

vest financial

"Stock options vest as follows: (i) 25% of underlying shares"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

underlying shares of common stock financial

"25% of underlying shares of common stock on first anniversary"

contingent right financial

"Each RSU represents the contingent right to receive, upon vesting"

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Schayowitz Adam

(Last) (First) (Middle)

C/O ZYMEWORKS INC.

108 PATRIOT DRIVE, SUITE A

(Street)

MIDDLETOWN DELAWARE 19709

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
04/09/2026

3. Issuer Name and Ticker or Trading Symbol
Zymeworks Inc. [ ZYME ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	See Remarks

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
No securities are beneficially owned	0	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	(1)(2)	10/08/2035	Common Stock	167,000	$16.92	D
Restricted Stock Unit	(3)	(3)	Common Stock	111,111	(4)	D

Explanation of Responses:

1. Stock option granted October 9, 2025.

2. Stock options vest as follows: (i) 25% of underlying shares of common stock on first anniversary of grant date and (ii) remainder of underlying shares of common stock in 36 equal monthly installments on last day of month following first anniversary of grant date.

3. Restricted stock units ("RSUs") granted October 9, 2025; vest in three equal annual installments beginning October 9, 2026.

4. Each RSU represents the contingent right to receive, upon vesting of the RSU, one share of common stock.

Remarks:

Exhibit List - Exhibit 24 - Power of Attorney EVP, Head of Research & Development

	/s/ Catherine Graham, Attorney-in-Fact	04/10/2026
	** Signature of Reporting Person	Date
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 5 (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 3: SEC 1473 (03-26)

FAQ

What insider equity holdings does Zymeworks (ZYME) report for Adam Schayowitz?

Adam Schayowitz holds stock options for 167,000 Zymeworks common shares at $16.92 per share, expiring October 8, 2035, plus 111,111 restricted stock units that convert into common shares as they vest over time.

How do Adam Schayowitz’s Zymeworks stock options vest?

His stock options vest 25% of the underlying common shares on the first anniversary of the October 9, 2025 grant date. The remaining 75% then vests in 36 equal monthly installments on the last day of each month that follows.

What is the vesting schedule for Adam Schayowitz’s RSUs at Zymeworks (ZYME)?

His 111,111 restricted stock units were granted October 9, 2025 and vest in three equal annual installments beginning October 9, 2026. Each vested RSU delivers one share of Zymeworks common stock to the holder.

What does each restricted stock unit represent for Zymeworks executive Adam Schayowitz?

Each restricted stock unit represents a contingent right to receive one share of Zymeworks common stock upon vesting. This means Schayowitz only receives the underlying shares if and when the specified vesting conditions are satisfied.

What is the exercise price and expiration date of Adam Schayowitz’s Zymeworks stock options?

His Zymeworks stock options have an exercise price of $16.92 per share and expire on October 8, 2035. They were granted October 9, 2025 and vest over four years, subject to the detailed schedule disclosed.