Mercer COO awarded 30,505 restricted stock units

Koppensteiner Adolf reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Koppensteiner Adolf reported acquisition or exercise transactions in this Form 4 filing.

Mercer International Inc. reported that COO, Pulp Products, Adolf Koppensteiner received a grant of 30,505 restricted stock units. Each unit represents a right to receive one share of Mercer common stock, or cash of equal value, vesting on January 1, 2029 if he remains in service.

Insider Trade Summary

Grant/Award: 30,505 shares

Grant/Award 1 txn

Insider Koppensteiner Adolf

Role COO, Pulp Products

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	30,505	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 30,505 contracts (Direct)

Footnotes (2)

1. F1. Each restricted stock unit represents a contingent right to receive one share of Mercer International Inc. ("Mercer") common stock, or, at the company's election, the cash value thereof. The restricted stock units vest on January 1, 2029 subject to the Reporting Person's continued service to Mercer.
2. F2. Not applicable.

Key Figures

RSUs granted: 30,505 units Vesting date: January 1, 2029 Underlying shares: 30,505 shares +2 more

5 metrics

RSUs granted 30,505 units Restricted stock units awarded to COO, Pulp Products

Vesting date January 1, 2029 RSUs vesting contingent on continued service

Underlying shares 30,505 shares Each RSU linked to one share of common stock

Exercise/Conversion price $0.00 per unit Equity award granted at no cash cost to executive

Post-grant derivative holdings 30,505 units Total RSUs held following the transaction

Key Terms

Restricted Stock Units, contingent right, vest, grant, award, or other acquisition

4 terms

Restricted Stock Units financial

"Each restricted stock unit represents a contingent right to receive one share of Mercer International Inc. common stock"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

contingent right financial

"represents a contingent right to receive one share of Mercer International Inc. common stock"

vest financial

"The restricted stock units vest on January 1, 2029 subject to the Reporting Person's continued service"

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.

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 MERC report for Adolf Koppensteiner?

Mercer International Inc. reported that COO, Pulp Products, Adolf Koppensteiner received a grant of 30,505 restricted stock units. These units are a form of equity compensation tied to Mercer’s common stock, subject to future vesting conditions.

How many restricted stock units did MERC grant to its COO, Pulp Products?

Mercer granted Adolf Koppensteiner 30,505 restricted stock units. Each unit is linked to one share of Mercer common stock or its cash value, providing long-term incentive aligned with shareholder interests once the vesting conditions are satisfied.

When do Adolf Koppensteiner’s MERC restricted stock units vest?

The restricted stock units vest on January 1, 2029. Vesting is conditioned on Adolf Koppensteiner’s continued service with Mercer International Inc., meaning he generally must remain employed through that date to receive the underlying shares or cash value.

What does each MERC restricted stock unit represent in this Form 4?

Each restricted stock unit represents a contingent right to receive one share of Mercer common stock or, at the company’s election, the cash value of that share. This structure gives Mercer flexibility in how it ultimately settles the award at vesting.

Is Adolf Koppensteiner’s MERC Form 4 transaction an open-market buy or sell?

No, the transaction is a grant of restricted stock units classified as an acquisition under code A. It reflects equity compensation awarded by Mercer International Inc., rather than an open-market purchase or sale of existing shares by the executive.

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

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Accepted by SEC EDGAR 06/05/2026 - 01:53 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^*

Koppensteiner Adolf

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	COO, Pulp Products

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

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

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
Restricted Stock Units	(1)	06/04/2026		A		30,505(1)		(1)	(2)	Common Stock	30,505	$0	30,505	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of Mercer International Inc. ("Mercer") common stock, or, at the company's election, the cash value thereof. The restricted stock units vest on January 1, 2029 subject to the Reporting Person's continued service to Mercer.

2. Not applicable.

	/s/Adolf Koppensteiner	06/05/2026
	** 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)