Gregory Ciongoli Files Form 3 Reporting 73,500 Direct Shares at Zymeworks

Rhea-AI Filing Summary

Zymeworks director Gregory Austin Ciongoli filed an initial Form 3 reporting beneficial ownership in the issuer. He directly owns 73,500 shares of common stock and, as manager of 4 Arrows Holdings, LLC, exercises sole voting and dispositive power over an additional 5,000 shares while disclaiming beneficial ownership except for his pecuniary interest. The Form 3 lists the event date as 08/10/2025 and includes a signature by an attorney-in-fact dated 08/12/2025.

Positive

• Director reported direct ownership of 73,500 common shares
• Disclosure of indirect holdings via 4 Arrows Holdings, LLC (5,000 shares) with sole voting and dispositive power
• No derivative securities were reported in Table II

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine initial insider disclosure showing direct and limited indirect holdings, with voting power noted.

The filing is a standard initial Form 3 for a company director. It reports 73,500 shares held directly and 5,000 shares held in an entity (4 Arrows Holdings, LLC) for which the reporting person is manager and exercises sole voting and dispositive power. The reporting person explicitly disclaims beneficial ownership of the LLC shares except for any pecuniary interest. This disclosure documents ownership and control facts required under Section 16.

Securities Analyst

TL;DR: No derivatives reported; filing records basic insider holdings and control details without material transaction activity.

Table II indicates no derivative securities are beneficially owned. The submission provides clear counts for common stock holdings and the nature of indirect ownership, and it is signed via attorney-in-fact. As an initial statement, it notifies the market of insider holdings but does not disclose purchases, sales, or option grants.

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

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1. Name and Address of Reporting Person^*

Ciongoli Gregory Austin

(Last) (First) (Middle)

C/O ZYMEWORKS INC.

108 PATRIOT DRIVE, SUITE A

(Street)

MIDDLETOWN DE 19709

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
08/10/2025

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

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

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

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

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)
Common Stock	73,500	D
Common Stock	5,000	I	See footnote(1)

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
No securities are beneficially owned	(2)	(2)	Not applicable	0	(2)	D

Explanation of Responses:

1. Represents shares held by 4 Arrows Holdings, LLC, for which the reporting person is the manager. The reporting person exercises sole voting and dispositive power over these shares and disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

2. Not applicable.

Remarks:

Exhibit List - Exhibit 24 - Power of Attorney

	/s/ Daniel Dex, Attorney-in-Fact	08/12/2025
	** 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.

FAQ

What did the ZYME Form 3 filed by Gregory Austin Ciongoli report?

The Form 3 reports 73,500 shares held directly and 5,000 shares held indirectly through 4 Arrows Holdings, LLC; relationship: Director.

Were any derivative securities reported on the Form 3 for ZYME?

No. Table II states there are no derivative securities beneficially owned.

What is the nature of the indirect ownership reported?

The 5,000 shares are held by 4 Arrows Holdings, LLC; the reporting person is the manager and exercises sole voting and dispositive power but disclaims beneficial ownership except for pecuniary interest.

When is the event date and who signed the Form 3?

The event requiring the statement is dated 08/10/2025 and the form is signed by /s/ Daniel Dex, Attorney-in-Fact with the signature date 08/12/2025.

What relationship to Zymeworks does the reporting person have?

The reporting person is listed as a Director of Zymeworks Inc.