X0306 4 2021-12-08 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 94025 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 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 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 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 2021-12-08 4 S 0 35836 33.23 D 2232251 I By Lightstone Ventures, L.P. Common Stock 2021-12-08 4 S 0 4883 33.23 D 304339 I By Lightstone Ventures (A), L.P. Common Stock 2021-12-08 4 S 0 1531 33.80 D 2230720 I By Lightstone Ventures, L.P. Common Stock 2021-12-08 4 S 0 208 33.80 D 304131 I By Lightstone Ventures (A), L.P. Common Stock 2021-12-09 4 S 0 11452 31.08 D 2219268 I By Lightstone Ventures, L.P. Common Stock 2021-12-09 4 S 0 1560 31.08 D 302571 I By Lightstone Ventures (A), L.P. Common Stock 2021-12-09 4 S 0 42203 32.06 D 2177065 I By Lightstone Ventures, L.P. Common Stock 2021-12-09 4 S 0 5751 32.06 D 296820 I By Lightstone Ventures (A), L.P. Common Stock 2021-12-09 4 S 0 14028 32.73 D 2163037 I By Lightstone Ventures, L.P. Common Stock 2021-12-09 4 S 0 1911 32.73 D 294909 I By Lightstone Ventures (A), L.P. Common Stock 2021-12-10 4 S 0 7093 30.77 D 2155944 I By Lightstone Ventures, L.P. Common Stock 2021-12-10 4 S 0 967 30.77 D 293942 I By Lightstone Ventures (A), L.P. Common Stock 2021-12-10 4 S 0 15942 31.55 D 2140002 I By Lightstone Ventures, L.P. Common Stock 2021-12-10 4 S 0 2172 31.55 D 291770 I By Lightstone Ventures (A), L.P. Common Stock 2021-12-10 4 S 0 88 32.16 D 2139914 I By Lightstone Ventures, L.P. Common Stock 2021-12-10 4 S 0 12 32.16 D 291758 I By Lightstone Ventures (A), L.P. Common Stock 2023469 I By Lightstone Ventures II, L.P. Common Stock 120212 I By Lightstone Ventures II (A), L.P. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.70 to $33.69 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Shares are held directly by Lightstone Ventures, L.P. ("LV LP"). LSV Associates, LLC (LSV Associates), is the general partner of LV LP and may be deemed to beneficially own the shares held by LV LP. Michael A. Carusi, Jean M. George and Henry A. Plain, Jr. are the managing directors of LSV Associates and may be deemed to share voting and investment power over the shares held by LV LP. Each of LSV Associates and Messrs. Carusi, George and Plain disclaims beneficial ownership of these shares except to the extent of its, his or her respective pecuniary interest therein. Shares are held directly by Lightstone Ventures (A), L.P. ("LV(A) LP"). LSV Associates is the general partner of LV(A) LP and may be deemed to beneficially own the shares held by LV(A) LP. Michael A. Carusi, Jean M. George and Henry A. Plain, Jr. are the managing directors of LSV Associates and may be deemed to share voting and investment power over the shares held by LV(A) LP. Each of LSV Associates and Messrs. Carusi, George and Plain disclaims beneficial ownership of these shares except to the extent of its, his or her respective pecuniary interest therein. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.70 to $33.92 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.50 to $31.49 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.50 to $32.49 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.50 to $33.25 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.12 to $31.09 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.15 to $32.01 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Shares are held directly by Lightstone Ventures II, L.P. ("LV II LP"). LSV Associates II, LLC (LSV Associates II), is the general partner of LV II LP and may be deemed to beneficially own the shares held by LV II LP. Michael A. Carusi, Jean M. George, Jason W. Lettmann and Henry A. Plain, Jr. are the managing directors of LSV Associates II and may be deemed to share voting and investment power over the shares held by LV II LP. Each of LSV Associates II and Messrs. Carusi, George and Plain disclaims beneficial ownership of these shares except to the extent of its, his or her respective pecuniary interest therein. Mr. Lettmann is a director of the Issuer and files separate Section 16 reports. Shares are held directly by Lightstone Ventures II (A), L.P. ("LV II(A) LP"). LSV Associates II, is the general partner of LV II(A) LP and may be deemed to beneficially own the shares held by LV II(A) LP. Michael A. Carusi, Jean M. George, Jason W. Lettmann and Henry A. Plain, Jr. are the managing directors of LSV Associates II and may be deemed to share voting and investment power over the shares held by LV II(A) LP. Each of LSV Associates II and Messrs. Carusi, George and Plain disclaims beneficial ownership of these shares except to the extent of its, his or her respective pecuniary interest therein. Mr. Lettmann is a director of the Issuer and files separate Section 16 reports. LSV Associates, LLC, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 Lightstone Ventures, L.P., By: LSV Associates, LLC, its general partner, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 Lightstone Ventures (A), L.P., By: LSV Associates, LLC, its general partner, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 LSV Associates II, LLC, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 Lightstone Ventures II, L.P., By: LSV Associates II, LLC, its general partner, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 Lightstone Ventures II (A), L.P., By: LSV Associates II, LLC, its general partner, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 Michael A. Carusi, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 Jean M. George, By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10 Henry A. Plain, Jr., By /s/ Travis Boettner, Attorney-in-Fact 2021-12-10