JDS1, LLC/Julian D. Singer Sent A Letter To Stockholders Of Catalyst Biosciences, Inc.

Dear Fellow Catalyst Biosciences, Inc. Stockholder:

Enclosed you will find the proxy materials of JDS1, LLC for the 2022 Annual Meeting of the Stockholders of Catalyst Biosciences, Inc. to be held in person on August 15, 2022, at 8:00 a.m., Pacific Time, at 611 Gateway Boulevard, Suite 710, South San Francisco, California 94080.

We, together with the othe…