Octave Specialty Announces Auditor Change

About this update from Octave Specialty Group, Inc.

Audit Committee Appoints Ernst & Young LLP as Auditor for the Year Ended December 31, 2026 KPMG to Remain the Auditor for the Year Ended December 31, 2025 NEW YORK, December 15, 2025 --( BUSINESS WIRE )--Octave Specialty Group, Inc. (NYSE: OSG) today announced that as a result of a review process, the Audit Committee of its Board of Directors has approved the engagement of Ernst & Young LLP ("EY") as the Company’s independent registered public accounting firm for the Company’s fiscal year ended December 31, 2026, subject to completion of EY’s client acceptance procedures and the execution of an engagement letter. KPMG LLP ("KPMG"), the Company’s current independent registered public accounting firm, will continue as the Company’s independent registered public accounting firm until the filing of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025. The review process was not related to any disagreement between the Company and KPMG. About Octave Octave Specialty Group, Inc. is a global specialty insurance firm that builds, buys, and scales niche insurance distribution and underwriting businesses. With a focus on operational excellence, disciplined growth, and innovation, Octave is creating a harmonized portfolio of companies that deliver exceptional performance and long-term value for shareholders. For more information, visit www.octavegroup.com . View source version on businesswire.com: https://www.businesswire.com/news/home/20251215589221/en/ Contacts Investors: Karen Beyer Managing Director, Investor Relations [email protected] Media: Kate Smith Director, Corporate Communications [email protected]

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