# EDGAR Filing Document

**Accession Number:** 0000897485
**File Stem:** 0001104659-26-064938
**Filing Date:** 2026-5
**Character Count:** 5289
**Document Hash:** f5c388efc44583f0a77ee43e8e8cc698
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-064938.hdr.sgml**: 20260521

**ACCESSION NUMBER**: 0001104659-26-064938

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260521

**DATE AS OF CHANGE**: 20260521

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MERCER INTERNATIONAL INC.
- **CENTRAL INDEX KEY:** 0001333274
- **STANDARD INDUSTRIAL CLASSIFICATION:** PULP MILLS [2611]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 470956945
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-81849
- **FILM NUMBER:** 261006321

**BUSINESS ADDRESS:**
- **STREET 1:** 700 WEST PENDER STREET
- **STREET 2:** SUITE 1120
- **CITY:** VANCOUVER
- **STATE:** A1
- **ZIP:** V6C 1G8
- **BUSINESS PHONE:** 206-674-4639

**MAIL ADDRESS:**
- **STREET 1:** 14900 INTERURBAN AVENUE SOUTH
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98168

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MERCER INTERNATIONAL REGCO INC.
- **DATE OF NAME CHANGE:** 20050715
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** KELLOGG PETER R
- **CENTRAL INDEX KEY:** 0000897485

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** 48 WALL STREET
- **STREET 2:** C/O IAT REINSURANCE CO LTD
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10005

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 11)**

**MERCER INTERNATIONAL INC.**

*(Name of Issuer)*

**Common Stock, par value $1.00**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Peter R. Kellogg**<br>48 Wall Street, 30th Floor<br>New York NY 10005<br>(212) 389-5841

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**05/19/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Peter R. Kellogg** | Name of reporting person<br>**Peter R. Kellogg** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**25380929.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**25380929.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**24469540.00** | Aggregate amount beneficially owned by each reporting person<br>**24469540.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**37.9%** | Percent of class represented by amount in Row (11)<br>**37.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $1.00

**(b) Name of Issuer:**
MERCER INTERNATIONAL INC.

**(c) Address of Issuer's Principal Executive Offices:**
Suite 1120, 700 West Pender Street, Vancouver, A1, V6C 1G8

**Item 5. Interest in Securities of the Issuer**

**(a)**
As of the close of business on May 19, 2026, Mr. Kellogg beneficially owned an aggregate of 25,380,929 shares, constituting approximately 37.9% of the shares outstanding.

**(b)**
As of the close of business on May 19, 2026, Mr. Kellogg beneficially owned an aggregate of 25,380,929 shares, constituting approximately 37.9% of the shares outstanding.

**(c)**
During May 12, 2026 through May 19, 2026, entities controlled by Mr. Kellogg purchased an aggregate of 1,000,000 shares at prices ranging from approximately $0.84 to $0.96 per share through the Nasdaq Stock Market.
All such transactions have been reported on a Form 4 filed by Mr. Kellogg.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Peter R. Kellogg

**Signature:** /s/ Marguerite Gorman

**Name/Title:** Marguerite Gorman, attorney-in-fact

**Date:** 05/19/2026