X0306 4 2020-07-21 0 0001810182 ALX ONCOLOGY HOLDINGS INC ALXO 0001688269 Lettmann Jason C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 1 0 1 0 Common Stock 2020-07-21 4 C 0 88704 A 107220 D Common Stock 2020-07-21 4 C 0 1831027 A 2268087 I See footnote Common Stock 2020-07-21 4 C 0 249632 A 309222 I See footnote Common Stock 2020-07-21 4 P 0 378000 19.00 A 378000 I See footnote Common Stock 2020-07-21 4 C 0 1498984 A 2023469 I See footnote Common Stock 2020-07-21 4 P 0 22000 19.00 A 22000 I See footnote Common Stock 2020-07-21 4 C 0 111528 A 120212 I See footnote Series A Convertible Preferred Stock 2020-07-21 4 C 0 78175 D Common Stock 78175 0 D Series A Convertible Preferred Stock 2020-07-21 4 C 0 1633743 D Common Stock 1633743 0 I See footnote Series A Convertible Preferred Stock 2020-07-21 4 C 0 222752 D Common Stock 222752 0 I See footnote Series A Convertible Preferred Stock 2020-07-21 4 C 0 683523 D Common Stock 683523 0 I See footnote Series A Convertible Preferred Stock 2020-07-21 4 C 0 39758 D Common Stock 39758 0 I See footnote Series B Convertible Preferred Stock 2020-07-21 4 C 0 59998 D Common Stock 59998 0 I See footnote Series B Convertible Preferred Stock 2020-07-21 4 C 0 8175 D Common Stock 8175 0 I See footnote Series B Convertible Preferred Stock 2020-07-21 4 C 0 150801 D Common Stock 150801 0 I See footnote Series B Convertible Preferred Stock 2020-07-21 4 C 0 11110 D Common Stock 11110 0 I See footnote Series C Convertible Preferred Stock 2020-07-21 4 C 0 10529 D Common Stock 10529 0 D Series C Convertible Preferred Stock 2020-07-21 4 C 0 137286 D Common Stock 137286 0 I See footnote Series C Convertible Preferred Stock 2020-07-21 4 C 0 18705 D Common Stock 18705 0 I See footnote Series C Convertible Preferred Stock 2020-07-21 4 C 0 664660 D Common Stock 664660 0 I See footnote Series C Convertible Preferred Stock 2020-07-21 4 C 0 38660 D Common Stock 38660 0 I See footnote Each share of Series A Convertible Preferred Stock automatically converted into Common Stock on a 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date. Each share of Series C Convertible Preferred Stock automatically converted into Common Stock on a 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date. Includes 18,516 shares of Common Stock issued as payment of accrued dividends upon conversion of the preferred stock on July 21, 2020. Each share of Series B Convertible Preferred Stock automatically converted into Common Stock on a 1:1 basis immediately prior to the completion of the Issuer's initial public offering of Common Stock and had no expiration date. Includes 437,060 shares of Common Stock issued as payment of accrued dividends upon conversion of the preferred stock on July 21, 2020. The shares are held of record by shares held of record by Lightstone Ventures, LP (LV LP) for which LSV Associates, LLC (LSV Associates) is the General Partner. The reporting person shares voting and dispositive power with respect to the shares held of record by LV LP but disclaims beneficial ownership of such shares except to the extent of his individual pecuniary interest therein. Includes 59,590 shares of Common Stock issued as payment of accrued dividends upon conversion of the preferred stock on July 21, 2020. The shares are held of record by shares held of record by Lightstone Ventures (A), LP (LV(A) LP) for which LSV Associates is the General Partner. The reporting person shares voting and dispositive power with respect to the shares held of record by LV(A) LP but disclaims beneficial ownership of such shares except to the extent of his individual pecuniary interest therein. The shares are held of record by Lightstone Ventures II, LP (LV II LP). As a managing director of LSV Associates II, LLC (LSV Associates II), the General Partner of LV II LP, the reporting person shares voting and dispositive power with respect to the shares held of record by LV II LP but disclaims beneficial ownership of such shares except to the extent of his individual pecuniary interest therein. Includes 146,485 shares of Common Stock issued as payment of accrued dividends upon conversion of the preferred stock on July 21, 2020. The shares are held of record by Lightstone Ventures II(A), LP (LV II(A) LP). As a managing director of LSV Associates II, the reporting person shares voting and dispositive power with respect to the shares held of record by LV II(A) LP but disclaims beneficial ownership of such shares except to the extent of his individual pecuniary interest therein. Includes 8,684 shares of Common Stock issued as payment of accrued dividends upon conversion of the preferred stock on July 21, 2020. /s/ Peter Garcia, by power of attorney 2020-07-21