Mercer director granted 41,250 deferred stock units

MCCARTNEY WILLIAM reported acquisition or exercise transactions in this Form 4 filing.

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Form Type

Rhea-AI Filing Summary

MCCARTNEY WILLIAM reported acquisition or exercise transactions in this Form 4 filing.

Mercer International Inc. reported that director William McCartney received a grant of 41,250 Deferred Stock Units (DSUs) as part of the non‑employee director compensation program under the Amended and Restated 2022 Stock Incentive Plan. Following this award, he holds 106,156 DSUs directly.

Each DSU represents the right to receive one share of Mercer common stock and related dividend equivalents after he ceases to be a director, unless further deferred. The DSUs vest on the earlier of the one‑year anniversary of the grant date or the company’s 2027 annual general meeting.

Insider Trade Summary

Grant/Award: 41,250 shares

Grant/Award 1 txn

Insider MCCARTNEY WILLIAM

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Deferred Stock Units	41,250	$0.00	$0.00

Holdings After Transaction: Deferred Stock Units — 106,156 contracts (Direct)

Footnotes (1)

F1. Represents deferred stock units ("DSUs") issued by Mercer International Inc. ("Mercer") as a grant to the Reporting Person under Mercer's non-employee director compensation program and the Amended and Restated 2022 Stock Incentive Plan in connection with his role as a director and Chairperson of Mercer's board of directors and in respect of the board term commencing June 1, 2026 and ending at its next regularly scheduled annual general meeting in 2027 (the "2027 AGM"). Each DSU vests on the earlier of the one year anniversary of the grant date or the date of the 2027 AGM and represents the right to receive one share of Mercer's common stock and dividend equivalents after the Reporting Person ceases to be a director of Mercer, unless deferred in accordance with its terms.

Key Figures

Deferred Stock Units granted: 41,250 units Total DSUs after transaction: 106,156 units Grant price per DSU: $0.0000 per unit +1 more

4 metrics

Deferred Stock Units granted 41,250 units Grant to William McCartney on the reported transaction date

Total DSUs after transaction 106,156 units William McCartney’s Deferred Stock Unit holdings following the grant

Grant price per DSU $0.0000 per unit Accounting grant price for Deferred Stock Units

Underlying common shares 41,250 shares Each DSU represents one share of Mercer common stock

Key Terms

Deferred Stock Units, non-employee director compensation program, Amended and Restated 2022 Stock Incentive Plan, dividend equivalents

4 terms

Deferred Stock Units financial

"Represents deferred stock units ("DSUs") issued by Mercer International Inc."

Deferred stock units are promises from a company to give an employee shares of stock at a future date, often after certain conditions are met or after leaving the company. They function like a form of delayed compensation, allowing employees to earn shares over time. For investors, they represent potential future ownership in the company, but do not provide immediate voting rights or dividends until the shares are actually received.

non-employee director compensation program financial

"issued by Mercer ... as a grant ... under Mercer's non-employee director compensation program"

Amended and Restated 2022 Stock Incentive Plan financial

"under Mercer's non-employee director compensation program and the Amended and Restated 2022 Stock Incentive Plan"

dividend equivalents financial

"represents the right to receive one share of Mercer's common stock and dividend equivalents"

Payments tied to employee or contractor equity awards that mirror the cash dividends paid on the company’s stock; they give the holder the same economic benefit as owning the shares without transferring actual shares—often paid in cash or additional award units when the award becomes payable. Investors care because these payments affect a company’s compensation costs, cash flow and potential share dilution, and they signal how management is being rewarded and aligned with shareholders.

FAQ

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What insider transaction did MERCER INTERNATIONAL INC. (MERC) report for William McCartney?

MERCER INTERNATIONAL INC. reported that director William McCartney received a grant of 41,250 Deferred Stock Units. These DSUs are part of his non-employee director compensation and increase his total DSU holdings to 106,156, tied to future delivery of common stock.

How many Deferred Stock Units does William McCartney hold in MERC after this grant?

After the latest grant, William McCartney holds 106,156 Deferred Stock Units in MERCER INTERNATIONAL INC. These units reflect compensation for board service and each DSU represents the right to receive one share of MERC common stock after board service ends.

When do William McCartney’s newly granted MERC Deferred Stock Units vest?

The newly granted MERC Deferred Stock Units vest on the earlier of the one-year anniversary of the grant date or the company’s 2027 annual general meeting. This schedule links vesting to both time served and the upcoming board term cycle.

What does each MERC Deferred Stock Unit granted to William McCartney represent?

Each MERC Deferred Stock Unit granted to William McCartney represents the right to receive one share of Mercer’s common stock plus dividend equivalents. Delivery occurs after he ceases to be a director, unless he elects to defer further under the plan’s terms.

Under which plan were William McCartney’s MERC Deferred Stock Units granted?

William McCartney’s Deferred Stock Units were granted under Mercer’s Amended and Restated 2022 Stock Incentive Plan. This plan governs non-employee director compensation, including DSU grants that convert into shares of common stock after board service ends.

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Accepted by SEC EDGAR 06/02/2026 - 07:53 PM EDT

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^*

MCCARTNEY WILLIAM

(Last)

(First)

(Middle)

SUITE 1120-700 WEST PENDER STREET

(Street)

VANCOUVER

BRITISH COLUMBIA

V6C 1G8

(City)

(State)

(Zip)

BRITISH COLUMBIA, CANADA

(Country)

2. Issuer Name and Ticker or Trading Symbol
MERCER INTERNATIONAL INC. [ MERC ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/02/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Deferred Stock Units⁽¹⁾	⁽¹⁾	06/02/2026		A⁽¹⁾		41,250⁽¹⁾		⁽¹⁾	⁽¹⁾	Common Stock⁽¹⁾	41,250⁽¹⁾	⁽¹⁾	106,156	D

Explanation of Responses:

1. Represents deferred stock units ("DSUs") issued by Mercer International Inc. ("Mercer") as a grant to the Reporting Person under Mercer's non-employee director compensation program and the Amended and Restated 2022 Stock Incentive Plan in connection with his role as a director and Chairperson of Mercer's board of directors and in respect of the board term commencing June 1, 2026 and ending at its next regularly scheduled annual general meeting in 2027 (the "2027 AGM"). Each DSU vests on the earlier of the one year anniversary of the grant date or the date of the 2027 AGM and represents the right to receive one share of Mercer's common stock and dividend equivalents after the Reporting Person ceases to be a director of Mercer, unless deferred in accordance with its terms.

	/s/William McCartney	06/02/2026
	** 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)

Source: View Original Filing on SEC EDGAR