As of November 10, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Mercer International Inc. The largest reported stake is Peter R. Kellogg's, at 40.25%. 11 filings are on record since July 23, 2025 (Schedule 13D/A, July 31, 2026).
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Key facts
- · Reporting person: Redwood Capital Management LLC · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13D, 2026-11-09
- · Reporting person: Barclays PLC · Sole voting: 2,685,256 · Shared voting: 0 · Sole dispositive: 2,685,256 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-11-06
- · Reporting person: Whitebox Advisors LLC · Sole voting: 0 · Shared voting: 3,590,350 · Sole dispositive: 0 · Shared dispositive: 3,590,350 · SCHEDULE 13G, 2026-08-14
- · Reporting person: Peter R. Kellogg · Sole voting: 8,730,672 · Shared voting: 18,220,000 · Sole dispositive: 8,730,672 · Shared dispositive: 18,220,000 · SCHEDULE 13D/A, 2026-07-31
- · Holder: Peter R. Kellogg · Percent: 37.9% · SCHEDULE 13D/A
Mercer International Inc. has 11 Schedule 13D or 13G filings on record since 2025-07-23. 2 holders' latest filing reports 5% or more of common stock, par value $1.00 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 40.25% | 26,950,672 | SCHEDULE 13D/A, 2026-07-31 | 2021-01-19 | |
| Whitebox Advisors LLC | 5.4% | 3,590,350 | SCHEDULE 13G, 2026-08-14 | 2026-08-07 |
| Barclays PLC | 4% | 2,685,256 | SCHEDULE 13G/A, 2026-11-06 | 2026-09-30 |
| Redwood Capital Management LLC | 0% | 0 | SCHEDULE 13D, 2026-11-09 | 2026-11-02 |
| Boundary Creek Advisors LP | 0% | 0 | SCHEDULE 13G/A, 2025-11-07 | 2025-09-30 |
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More on Mercer International Inc. and the records around it.
Mercer International Inc. elsewhere on the record
Companies that share a holder
- Boundary Creek Advisors LP also filed stake reports on 1 other company: Mativ Holdings, Inc. (Aug 2025)
- Peter R. Kellogg also filed stake reports on 2 other companies: Scully Royalty Ltd. (Sep 2026), NAM TAI PROPERTY INC. (Jul 2026)
- REDWOOD CAPITAL MANAGEMENT LLC also filed stake reports on 5 other companies: Office Properties Income Trust (Aug 2026), Xponential Fitness, Inc. (Feb 2026), EchoStar CORP (Nov 2025)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Peter R. Kellogg | 8,730,672 | 18,220,000 | 8,730,672 | 18,220,000 | SCHEDULE 13D/A, 2026-07-31 |
| Charles K. Kellogg | 0 | 20,220,000 | 0 | 20,220,000 | SCHEDULE 13D/A, 2026-07-31 |
| Goose Creek Capital, Inc. | 0 | 18,220,000 | 0 | 18,220,000 | SCHEDULE 13D/A, 2026-07-31 |
| IAT Reinsurance Company Ltd. | 0 | 11,920,000 | 0 | 11,920,000 | SCHEDULE 13D/A, 2026-07-31 |
| IAT Insurance Group, Inc. | 0 | 6,217,000 | 0 | 6,217,000 | SCHEDULE 13D/A, 2026-07-31 |
| Harco National Insurance Company | 0 | 6,217,000 | 0 | 6,217,000 | SCHEDULE 13D/A, 2026-07-31 |
| Whitebox Advisors LLC | 0 | 3,590,350 | 0 | 3,590,350 | SCHEDULE 13G, 2026-08-14 |
| Whitebox General Partner LLC | 0 | 3,590,350 | 0 | 3,590,350 | SCHEDULE 13G, 2026-08-14 |
| Barclays PLC | 2,685,256 | 0 | 2,685,256 | 0 | SCHEDULE 13G/A, 2026-11-06 |
| Redwood Capital Management LLC | 0 | 0 | 0 | 0 | SCHEDULE 13D, 2026-11-09 |
| Redwood Capital Management Holdings, LP | 0 | 0 | 0 | 0 | SCHEDULE 13D, 2026-11-09 |
| Double Twins K, LLC | 0 | 0 | 0 | 0 | SCHEDULE 13D, 2026-11-09 |
| Redwood Master Fund, Ltd. | 0 | 0 | 0 | 0 | SCHEDULE 13D, 2026-11-09 |
| Ruben Kliksberg | 0 | 0 | 0 | 0 | SCHEDULE 13D, 2026-11-09 |
The latest filing identifies Mercer International Inc. by CUSIP 588056101 and gives its principal executive office as 700 West Pender Street, Suite 1120, Vancouver (SCHEDULE 13D, 2026-11-09).
What the percentages are based on
As of the date hereof, each of WA and WGP is deemed to beneficially own approximately 5.4% of the shares of Common Stock outstanding. Percent of class was calculated based on 67,018,033 shares of Common Stock outstanding as of August 4, 2026, as reported in the Issuer's quarterly report on Form 10-Q filed with the Securities and Exchange Commission on August 6, 2026.Whitebox Advisors LLC, SCHEDULE 13G, 2026-08-14
Source of funds (Item 3)
The 6,300,000 Shares held directly by Goose Creek Capital, Inc. were acquired using its general working capital. The 5,703,000 Shares held directly by IAT Reinsurance Company Ltd. were acquired using its general working capital. The 889,141 Shares held directly by Harco National Insurance Company, and its direct and indirect subsidiaries -- TransGuard Insurance Company of America, Inc.Peter R. Kellogg, SCHEDULE 13D/A, 2026-07-31
The funds for the purchase of the Shares by the Reporting Persons came from the working capital of the Fund and other private funds managed by Redwood, over which the Reporting Persons, through their roles described above in Item 2(c), exercise investment discretion. No borrowed funds were used to purchase the Shares, other than borrowed funds used for working capital purposes in the ordinary course of business.Redwood Capital Management LLC, SCHEDULE 13D, 2026-11-09
Purpose of Transaction (Item 4)
Peter R. Kellogg
On December 2, 2019, Peter Kellogg (as seller) and Charles Kellogg (as buyer) entered into a Stock Purchase Agreement (the "Purchase Agreement") pursuant to which Peter Kellogg sold to Charles Kellogg all 100,005 issued and outstanding shares of Class A Voting Preferred Stock, par value $1.00 per share, of Goose Creek Capital, Inc., representing all of the voting equity of Goose Creek Capital, Inc. The transaction closed on January 19, 2021, at which time, subject to the oral agreement described in Item 6 below, Charles Kellogg indirectly acquired voting control over the Shares held by Goose Creek Capital, Inc. and its direct and indirect subsidiaries, including IAT Reinsurance Company Ltd., IAT Insurance Group, Inc., Harco National Insurance Company, and Harco's direct and indirect insurance subsidiaries. This Amendment also reflects the addition as Reporting Persons of IAT Reinsurance Company Ltd., IAT Insurance Group, Inc., and Harco National Insurance Company, each of which was omitted as a named Reporting Person from prior filings notwithstanding that the Shares held through each such entity were included in the aggregate beneficial ownership figures reported therein. The Reporting Persons acquired their respective Shares in the ordinary course of business and/or for investment purposes. The Reporting Persons intend to review their investment in the Issuer on a continuing basis and, depending upon the price and availability of Shares, subsequent developments affecting …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-07-31; the filing has the rest
Redwood Capital Management LLC
The Reporting Persons acquired the Shares for investment purposes. On November 2, 2026, certain funds managed by Redwood, in their capacity as holders of the Issuer's 12.875% Senior Notes due 2028 and 5.125% Senior Notes due 2029 (together, the "Senior Notes"), entered into the RSA and the Backstop Commitment Letter described in Item 6. On November 3, 2026, the Reporting Persons sold all of the Shares held by them. If consummated, the Restructuring described in Item 6 would result in one or more of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D, as described in the Issuer's Current Report on Form 8-K filed on November 3, 2026. Except as set forth in this Schedule 13D, the Reporting Persons have no present plans or proposals that relate to or would result in any of the matters set forth in clauses (a) through (j) of Item 4 of Schedule 13D. The foregoing description of the outstanding 12.875% Senior Notes due October 1, 2028 (the "2028 Senior Notes") and the 5.125% Senior Notes due February 1, 2029 (the "2029 Senior Notes" and collectively with the 2028 Senior Notes, the "Senior Notes") do not purport to be complete and are subject to and qualified in their entirety by the Form of 12.875% Senior Note due 2028 included as Exhibit 4.2 of the Issuer's 8-K filed on September 21, 2023 and the Form of 5.125% Senior Note due 2029 included as Exhibit 4.2 of the Issuer's 8-K filed on January 26, 2021, each of which are incorporated by reference. The …The first part of Item 4 of the SCHEDULE 13D filed 2026-11-09; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-23 | Peter R. Kellogg | 35.1% | SCHEDULE 13D/A |
| 2025-08-14 | Redwood Capital Management LLC | 5% | SCHEDULE 13G |
| 2025-11-07 | Boundary Creek Advisors LP | 0% | SCHEDULE 13G/A |
| 2025-11-14 | Redwood Capital Management LLC | 6.9% | SCHEDULE 13G/A |
| 2025-12-09 | Peter R. Kellogg | 36.5% | SCHEDULE 13D/A |
| 2026-05-14 | Barclays PLC | 5.75% | SCHEDULE 13G |
| 2026-05-21 | Peter R. Kellogg | 37.9% | SCHEDULE 13D/A |
| 2026-07-31 | Peter R. Kellogg | 40.25% | SCHEDULE 13D/A |
| 2026-08-14 | Whitebox Advisors LLC | 5.4% | SCHEDULE 13G |
| 2026-11-06 | Barclays PLC | 4% | SCHEDULE 13G/A |
| 2026-11-09 | Redwood Capital Management LLC | 0% | SCHEDULE 13D |
Questions about who owns Mercer International Inc.
Who owns Mercer International Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Mercer International Inc.: Peter R. Kellogg (40.25%, Schedule 13D/A, filed 2026-07-31) and Whitebox Advisors LLC (5.4%, Schedule 13G, filed 2026-08-14).
Who are the largest shareholders of Mercer International Inc.?
By the share each holder's latest filing reports, the largest holders of Mercer International Inc. on this page are Peter R. Kellogg (40.25%) and Whitebox Advisors LLC (5.4%).
When did Peter R. Kellogg buy into Mercer International Inc.?
The filings give report dates, not purchase dates. The earliest filing from Peter R. Kellogg on this page is the Schedule 13D/A, filed 2025-07-23, reporting 35.1%; its latest, Schedule 13D/A filed 2026-07-31, reports 40.25%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 11 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.