# EDGAR Filing Document

**Accession Number:** 0001333274
**File Stem:** 0001193125-25-325130
**Filing Date:** 2025-12
**Character Count:** 9308
**Document Hash:** 5b5adc32fc54e5293dfc6f7da1aa0ce7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-325130.hdr.sgml**: 20251218

**ACCESSION NUMBER**: 0001193125-25-325130

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20251218

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251218

**DATE AS OF CHANGE**: 20251218

**FILER**: 

**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:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-51826
- **FILM NUMBER:** 251584150

**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

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): December 18, 2025

## MERCER INTERNATIONAL INC.

#### (Exact name of Registrant as Specified in Its Charter)

---

| | | |
|:---|:---|:---|
| **Washington** | **000-51826** | **47-0956945** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

#### Suite 1120, 700 West Pender Street, Vancouver, British Columbia, Canada, V6C 1G8

#### (Address of Principal Executive Offices)

#### Registrant's Telephone Number, Including Area Code: (604) 684-1099

#### Not Applicable

#### (Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instructions A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading<br>Symbol(s)** | **Name of each exchange<br>on which registered** |
| Common Stock, par value $1.00 per share | MERC | NASDAQ Global Select Market |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

#### Item 7.01. Regulation FD Disclosure.
The information furnished under Item 7.01 of this Current Report shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall it be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing,

On December 18, 2025, Mercer International Inc. (the "Company") announced by press release an update on its subsidiary's and Svante Technologies Inc.'s carbon dioxide capture demonstration unit. A copy of such press release is furnished as Exhibit 99.1 to this Current Report.

#### Item 9.01. Financial Statements and Exhibits
(d) Exhibits.

---

| | |
|:---|:---|
| **Exhibit**<br> **Number** | **Description** |
| 99.1 | [Press Release dated December 18, 2025](d72517dex991.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **MERCER INTERNATIONAL INC.** | **MERCER INTERNATIONAL INC.** |
| Date: December 18, 2025 | By: | /s/ Richard Short |
|  |  | Richard Short |
|  |  | Chief Financial Officer |

---

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g72517g1219033726874.jpg)

<u>For Immediate Release</u> 

**Mercer Peace River Pulp Ltd. and Svante Co₂ Capture Demonstration Unit** 

NEW YORK, NY, December 18, 2025 - Mercer International Inc. ("Mercer" or the "Company") (Nasdaq: MERC), a global forest products company with operations in Germany, the U.S., and Canada, announces that its subsidiary, Mercer Peace River Pulp Ltd. (MPR), and Svante Technologies Inc. (Svante) have commenced operation of a previously announced carbon dioxide (CO₂) capture demonstration unit at the Mercer Peace River pulp mill in northern Alberta. The pilot project is designed to evaluate Svante's solid sorbent carbon capture technology on biogenic CO₂ emissions from the mill's recovery boiler flue gas.

This stage builds on the previously announced Front-End Engineering and Design Phase 2 (FEL-2 / pre-FEED). That phase evaluated design, site integration, cost and risk assessment, and options for potential future commercial-scale deployment at the mill. The anticipated 6-month demonstration is intended to generate the technical and operational data needed to support the next engineering phase and longer-term planning.

"Commissioning this demonstration unit is an important and cost-efficient step for our Peace River team. It allows us to evaluate carbon capture performance in our operating environment and gather practical data on what would be required for any future scale-up," said Bill Adams, Chief Sustainability Officer and Senior Vice President, Canadian Pulp Operations. Bill continued, "The results from this on-site demonstration will help us evaluate the decarbonization potential of this technology for biogenic emissions and inform longer-term planning across our pulp operations."

"We are pleased to see this project advance into on-site demonstration operations," said Scott Gardner, President of Svante Development Company, Svante's project development business unit. "Testing our technology in an operating pulp mill environment is an important step in gathering the information needed to assess future opportunities for commercial-scale carbon capture in the wider pulp and paper industry."

Any further advancement of the project beyond the demonstration phase will be dependent on a number of factors, including, among other things, the results of the demonstration and further other economic, technical and commercial considerations.

**About Mercer International Inc.**![LOGO](g72517g1219033727036.jpg) 1 of 2

------

![LOGO](g72517g1219033726874.jpg)

Mercer International Inc. is a global forest products company with operations in Germany, the USA, and Canada. Its consolidated annual production capacity is 2.1 million tonnes of pulp (air-dried tonnes, ADTMs), 960 million board feet of lumber, 210 thousand cubic meters of CLT, 45 thousand cubic meters of glulam, 17 million pallets, and 230,000 metric tonnes of biofuels. For further information on the company, please visit its website at <u>mercerint.com</u>.

**Forward-Looking Statements**

*The preceding includes forward-looking statements which involve known and unknown risks and uncertainties which may cause our actual results in future periods to differ materially from forecasted results. Words such as "expects", "anticipates", "are optimistic that", "projects", "intends", "designed", "will", "believes", "estimates", "may", "could" and variations of such words and similar expressions are intended to identify such forward-looking statements. Among those factors which could cause actual results to differ materially are the following: the highly cyclical nature of our business, raw material costs, our level of indebtedness, competition, foreign exchange and interest rate fluctuations, our use of derivatives, expenditures for capital projects, environmental regulation and compliance, disruptions to our production, market conditions and other risk factors listed from time to time in our SEC reports.*

APPROVED BY:

*William D. McCartney*

Chairman of the Board

+1 (604) 684-1099

*Juan Carlos Bueno*

Chief Executive Officer

+1 (604) 684-1099

![LOGO](g72517g1219033727036.jpg) 2 of 2