On December 20, 2023, Dr. Hermann Eul, a member of the Board of Directors (the "Board") of Knowles Corporation (the "Company") informed the Company of his decision to resign as a member of the Board and as a member of the Company's Compensation Committee (the "Committee"), effective January 1, 2024. Dr. Eul's resignation is not the result of any dispute or disagreement with the Company on any matter related to the Company's operations, policies, or practices. In connection with Dr. Eul's resignation and in recognition of his service and contributions to the Company, the Committee approved the accelerated vesting of 6,915 outstanding and unvested restricted stock units previously granted to Dr. Eul under the Company's 2018 Equity and Cash Incentive Plan.