ANAPTYSBIO INC

Under rules adopted by the Securities and Exchange Commission (“SEC”), we are furnishing proxy materials to our stockholders primarily via the Internet, instead of mailing printed copies to each stockholder. On or about April 29, 2025, we expect to send to our stockholders a Notice of Internet Availability of Proxy Materials containing instructions on how to access our proxy materials, including our proxy statement and our annual report on Form 10-K. The Notice of Internet Availability of Proxy Materials also provides instructions on how to vote through the Internet or by telephone and includes instructions on how to receive paper copies of the proxy materials by mail or an electronic copy of the proxy materials by email.

This process is designed to reduce our environmental impact and lower the costs of printing and distributing our proxy materials without impacting our stockholders’ timely access to this important information. However, if you would prefer to receive printed proxy materials, please follow the instructions included in the Notice of Internet Availability.