X0407 4 2023-06-09 0 0001828673 HCW Biologics Inc. HCWB 0001866256 Byam Rebecca C/O HCW BIOLOGICS INC 2929 N. COMMERCE PARKWAY MIRAMAR FL 33025 0 1 0 0 Chief Financial Officer 0 Common Stock 2023-06-09 4 P 0 20000 2.0643 A 543946 D The range of prices for the shares of Common Stock is from $1.99 to $2.18. The reporting person undertakes that she will provide, upon request by the staff of the U.S. Securities and Exchange Commission, full information regarding the number of securities purchased at each separate price. /s/ Rebecca A. Byam 2023-06-09