On April 17, 2023, Susan Silbermann notified HilleVax, Inc. (the “Company”) that she will resign from the Company's board of directors (the “Board”), effective April 18, 2023. Ms. Silbermann received and accepted a new position of employment that will render her unavailable to fulfill her responsibilities as a director for the term expiring at the Company's 2023 annual meeting of stockholders. Ms. Silbermann's decision to resign from the Board did not result from any disagreement with the Company concerning any matter relating to its operations, policies or practices.