Interfor Corporation — Board/Management Information 2025

Dec 19, 2025

Form 51-102F3
Material Change Report

Item 1. Name and Address of Company
Interfor Corporation (the "Company")
1600-4720 Kingsway
Metrotower II
Burnaby, BC V5H 4N2

Item 2. Date of Material Change
December 8, 2025

Item 3. News Release
On December 8, 2025 a news release in respect of the material change was disseminated through GlobeNewswire service and filed under the profile of the Company on SEDAR+ (www.sedarplus.ca).

Item 4. Summary of Material Change
On December 8, 2025, the Company announced that it has made several leadership changes. Mike Mackay has been appointed Executive Vice President & Chief Financial Officer, effective December 8, 2025. Mr. Mackay, who joined Interfor in 2015, has held several leadership roles in the Company's finance organization, most recently serving as Vice President, Corporate Development & Treasury. Mr. Mackay will succeed Rick Pozzebon, who will be leaving Interfor to pursue other opportunities.

Andrew Horahan has been appointed Executive Vice President, Chief Operating Officer, also effective December 8, 2025. Mr. Horahan joined Interfor in 2008 and has since then, held several operations leadership positions in the Company, most recently serving as Executive Vice President, Canadian Operations. In his expanded new role, Mr. Horahan will assume responsibility for leading all of the Company's operations across both the U.S. and Canada.

"The appointments of Mike Mackay and Andrew Horahan to their new roles marks a new chapter for Interfor," said Ian Fillinger, President & Chief Executive Officer. "Their combined experience, deep knowledge of our business, and proven leadership will be critical as we continue to execute on our strategy and adapt to evolving market conditions. I would like to thank Rick Pozzebon for his leadership through several important strategic transactions and for his many contributions over the last 12 years. We wish him continued success in the future."

Item 5.1 Full Description of Material Change
See attached press release.

Item 5.2 Disclosure for Restructuring Transactions
Not applicable.

Item 6. Reliance on subsection 7.1(2) of National Instrument 51-102
Not applicable.

Item 7. Omitted Information

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Not applicable.

Item 8. Executive Officer

For further information regarding this Material Change Report, contact:

Xenia Kritsos
Senior Vice President, General Counsel & Corporate Secretary
604-422-3400

Item 9. Date of Report

December 18, 2025

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INTERFOR Building Value

Interfor Corporation

Burnaby, B.C.

December 8, 2025

Interfor Announces Appointment of Chief Financial Officer; Chief Operating Officer

INTERFOR CORPORATION ("Interfor" or the "Company") (TSX: IFP) announced today that it has made several leadership changes. Mike Mackay has been appointed Executive Vice President & Chief Financial Officer, effective December 8, 2025. Mr. Mackay, who joined Interfor in 2015, has held several leadership roles in the Company's finance organization, most recently serving as Vice President, Corporate Development & Treasury. Mr. Mackay will succeed Rick Pozzebon, who will be leaving Interfor to pursue other opportunities.

Andrew Horahan has been appointed Executive Vice President, Chief Operating Officer, also effective December 8, 2025. Mr. Horahan joined Interfor in 2008 and has since then, held several operations leadership positions in the Company, most recently serving as Executive Vice President, Canadian Operations. In his expanded new role, Mr. Horahan will assume responsibility for leading all of the Company's operations across both the U.S. and Canada.

"The appointments of Mike Mackay and Andrew Horahan to their new roles marks a new chapter for Interfor," said Ian Fillinger, President & Chief Executive Officer. "Their combined experience, deep knowledge of our business, and proven leadership will be critical as we continue to execute on our strategy and adapt to evolving market conditions. I would like to thank Rick Pozzebon for his leadership through several important strategic transactions and for his many contributions over the last 12 years. We wish him continued success in the future."

ABOUT INTERFOR

Interfor is a growth-oriented forest products company with operations in Canada and the United States. The Company has annual lumber production capacity of approximately 4.7 billion board feet and offers a diverse line of lumber products to customers around the world. For more information about Interfor, visit our website at www.interfor.com.

Investor Contacts:

Mike Mackay, Executive Vice President & Chief Financial Officer (604) 689-6846

Media Contact:

Svetlana Kayumova, Vice President, Communications & Government Relations (604) 422-7329 svetlana.kayumova@interfor.com