Zymeworks COO adds 939 ESPP shares at $22.22

Zymeworks Inc. executive Mark Hollywood, EVP & Chief Operating Officer, acquired 939 shares of common stock through the company’s Employee Stock Purchase Plan.

Rhea-AI Filing Summary

Zymeworks Inc. executive Mark Hollywood, EVP & Chief Operating Officer, acquired 939 shares of common stock through the company’s Employee Stock Purchase Plan. The shares were bought for $22.22 each, reflecting a 15% discount to the closing price on June 30, 2026. After this ESPP purchase, he holds 133,852 common shares directly, so the new shares represent a small addition to his existing position.

Insider Trade Summary

Grant/Award: 939 shares

Grant/Award 1 txn

Insider Hollywood Mark

Role EVP & Chief Operating Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	939	$22.22	$21K

Holdings After Transaction: Common Stock — 133,852 shares (Direct)

Footnotes (2)

1. F1. The shares were acquired under the Issuer's Employee Stock Purchase Plan (the "ESPP") for the ESPP purchase period of January 1, 2026 to June 30, 2026.
2. F2. The purchase price reflects a 15% discount to the closing price of the Issuer's Common Stock on June 30, 2026 pursuant to the provisions of the ESPP.

Key Figures

ESPP shares acquired: 939 shares ESPP purchase price: $22.22 per share Post-transaction holdings: 133,852 shares +3 more

6 metrics

ESPP shares acquired 939 shares Common Stock acquired on July 6, 2026

ESPP purchase price $22.22 per share Price under Employee Stock Purchase Plan

Post-transaction holdings 133,852 shares Common Stock directly owned after ESPP purchase

ESPP discount 15% Discount to June 30, 2026 closing price

ESPP purchase period start January 1, 2026 Start of ESPP purchase period

ESPP purchase period end June 30, 2026 End of ESPP purchase period tied to discount

Key Terms

Employee Stock Purchase Plan, ESPP, closing price, Grant, award, or other acquisition

4 terms

Employee Stock Purchase Plan financial

"The shares were acquired under the Issuer's Employee Stock Purchase Plan (the "ESPP")"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

ESPP financial

"for the ESPP purchase period of January 1, 2026 to June 30, 2026"

An Employee Stock Purchase Plan (ESPP) is a company program that lets employees buy the company’s shares at a reduced price, usually by setting aside a small portion of their pay over time. It matters to investors because it encourages employees to own part of the business—like giving staff a discounted membership— which can boost commitment and performance, while also potentially increasing the number of shares available and affecting shareholder value.

closing price financial

"discount to the closing price of the Issuer's Common Stock on June 30, 2026"

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

FAQ

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

What insider transaction did ZYME executive Mark Hollywood report?

Mark Hollywood reported acquiring 939 Zymeworks Inc. shares. The acquisition came through the Employee Stock Purchase Plan at a discounted price, adding modestly to his existing direct ownership of 133,852 common shares after the transaction.

At what price did Mark Hollywood acquire Zymeworks (ZYME) shares?

He acquired the shares at $22.22 per share. This price reflects a 15% discount to Zymeworks’ common stock closing price on June 30, 2026, as provided under the company’s Employee Stock Purchase Plan.

How many Zymeworks shares does Mark Hollywood own after this Form 4?

After the reported transaction, he directly owns 133,852 Zymeworks common shares. The filing shows this total following the 939-share ESPP acquisition, which was recorded as a grant or award-type acquisition rather than an open-market purchase.

Was the Zymeworks (ZYME) insider transaction an open-market buy or an ESPP purchase?

The transaction was an ESPP purchase, not an open-market buy. Shares were acquired under Zymeworks’ Employee Stock Purchase Plan for the January 1, 2026 to June 30, 2026 purchase period at a plan-defined 15% discount.

What does the 15% discount in Zymeworks’ ESPP transaction mean?

The 15% discount means the ESPP purchase price was 15% below the June 30, 2026 closing price. For this period, that produced a purchase price of $22.22 per share for Mark Hollywood’s 939-share acquisition under the Employee Stock Purchase Plan.

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

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Accepted by SEC EDGAR 07/06/2026 - 05:29 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Hollywood Mark

(Last) (First) (Middle)

C/O ZYMEWORKS INC.

108 PATRIOT DRIVE, SUITE A

(Street)

MIDDLETOWN DELAWARE 19709

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & Chief Operating Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/06/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/06/2026		A(1)		939	A	$22.22(2)	133,852	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The shares were acquired under the Issuer's Employee Stock Purchase Plan (the "ESPP") for the ESPP purchase period of January 1, 2026 to June 30, 2026.

2. The purchase price reflects a 15% discount to the closing price of the Issuer's Common Stock on June 30, 2026 pursuant to the provisions of the ESPP.

Remarks:

	/s/ Catherine Graham, Attorney-in-Fact	07/06/2026
	** 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 4 (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 4: SEC 1474 (03-26)