Mercer International : 2026 Proxy Materials Notice of Internet Availability (2026 Proxy Materials Notice of Internet Availability)

About this update from Mercer International Inc.

Online Go to https://www.investorvote.com/merc or scan the QR code - login details are located in the shaded bar below. Shareholder Meeting Notice Important Notice Regarding the Availability of Proxy Materials for the Mercer International Inc. Shareholder Meeting to be Held on June 1, 2026 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual shareholders' meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all the important information contained in the proxy materials before voting. The Notice, Proxy Statement and 2025 Annual Report on Form 10-K are available at: www.investorvote.com/merc Easy Online Access - View your proxy materials and vote. Step 1: Go to www.investorvote.com/merc. Step 2: Click on the icon on the right to view meeting materials. Step 3: Return to the investorvote.com window and follow the instructions on the screen to log in. Step 4: Make your selections as instructed on each screen for your delivery preferences. Step 5: Vote your shares. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials - If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before May 15, 2026 to facilitate timely delivery. 2 N O T 049FPD Shareholder Meeting Notice The 2026 Annual Meeting of Shareholders of Mercer International Inc. will be held on Monday, June 1, 2026 at 10:00 A.M. (Vancouver Time), both virtually via the Internet at www.meetnow.global/MP7FK25 and in person at Suite 1120, 700 West Pender Street, Vancouver, British Columbia, Canada. To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. Proposals to be voted on at the meeting are listed below along with the Board of Directors' recommendations. The Board of Directors recommend a vote FOR all the nominees listed, FOR Proposals 2 and 3: Election of Directors: 01 - Juan Carlos Bueno 02 - William D. McCartney 03 - James Shepherd 04 - Linda J. Welty 05 - Rainer Rettig 06 - Alice Laberge 07 - Janine North 08 - Thomas Kevin Corrick 09 - Markwart von Pentz Approval of the advisory (non-binding) resolution to approve executive compensation. Ratification of the selection of PricewaterhouseCoopers LLP as independent registered public accounting firm for fiscal year 2026. In his or her discretion, the proxyholder is authorized to vote upon such other business as may properly come before the meeting. PLEASE NOTE - YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. Here's how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. Internet - Go to www.investorvote.com/merc. Phone - Call us free of charge at 1-866-641-4276. Email - Send an email to [email protected] with "Proxy Materials Mercer International Inc." in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, requests for a paper copy of proxy materials must be received by May 15, 2026.

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