X0306 4 2020-07-21 0 0001810182 ALX ONCOLOGY HOLDINGS INC ALXO 0001643828 LSV Associates, LLC C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 0001572522 Lightstone Ventures, L.P. C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 0 0 1 0 0001572523 Lightstone Ventures (A), L.P. C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 0001699565 Lightstone Ventures II, L.P. C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 0001706610 Lightstone Ventures II (A), L.P. C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 0001818388 LSV Associates II, LLC C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 0001306506 Carusi Michael A C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 0001291804 George Jean C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 0001384286 Plain Henry A JR C/O LSV CAPITAL MANAGEMENT, LLC 2884 SAND HILL ROAD, SUITE 121 MENLO PARK CA 94025 0 0 1 0 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 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 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 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. 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 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 Lightstone Ventures, LP (LV LP). LSV Associates, LLC (LSV Associates), the General Partner of LV LP, and Michael A. Carusi, Jean M. George and Henry A. Plain, Jr., the individual managing directors of LSV Associates, share voting and dispositive power with respect to the shares held of record by LV LP, but each disclaims beneficial ownership of such shares except to the extent of his, her or its 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 Lightstone Ventures (A), LP (LV(A) LP). LSV Associates, the General Partner of LV(A) LP, and Mr. Carusi, Ms. George and Mr. Plain, the individual managing directors of LSV Associates, share voting and dispositive power with respect to the shares held of record by LV(A) LP, but each disclaims beneficial ownership of such shares except to the extent of his, her or its individual pecuniary interest therein. The shares are held of record by Lightstone Ventures II, LP (LV II LP). LSV Associates II, LLC (LSV Associates II), the General Partner of LV II LP, and Mr. Carusi, Ms. George, Mr. Plain and Jason W. Lettmann, as the individual managing directors of LSV Associates II, share voting and dispositive power with respect to the shares held of record by LV II LP, but each disclaims beneficial ownership of such shares except to the extent of his, her or its individual pecuniary interest therein. Mr. Lettmann is a director of the Issuer and files separate Section 16 reports. 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, LP (LV II(A) LP). LSV Associates II, LLC (LSV Associates II), the General Partner of LV(A) II LP, and Mr. Carusi, Ms. George, Mr. Plain and Mr. Lettmann, as the individual managing directors of LSV Associates II, share voting and dispositive power with respect to the shares held of record by LV II(A) LP, but each disclaims beneficial ownership of such shares except to the extent of his, her or its individual pecuniary interest therein. Mr. Lettmann is a director of the Issuer and files separate Section 16 reports. Includes 8,684 shares of Common Stock issued as payment of accrued dividends upon conversion of the preferred stock on July 21, 2020. /s/ Travis Boettner, by power of attorney for LSV Associates, LLC, the General Partner of Lightstone Ventures, L.P. 2020-07-21 /s/ Travis Boettner, by power of attorney for LSV Associates, LLC, the General Partner of Lightstone Ventures(A), L.P. 2020-07-21 /s/ Travis Boettner, by power of attorney for LSV Associates, LLC 2020-07-21 /s/ Travis Boettner, by power of attorney for LSV Associates II, LLC, the General Partner of Lightstone Ventures II, L.P. 2020-07-21 /s/ Travis Boettner, by power of attorney for LSV Associates II, LLC, the General Partner of Lightstone Ventures II(A), L.P. 2020-07-21 /s/ Travis Boettner, by power of attorney for LSV Associates II, LLC 2020-07-21 /s/ Travis Boettner, by power of attorney for Michael A. Carusi 2020-07-21 /s/ Travis Boettner, by power of attorney for Jean M. George 2020-07-21 /s/ Travis Boettner, by power of attorney for Henry A. Plain, Jr. 2020-07-21