X0306 4 2021-06-11 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 0 0 Stock Option (right to buy) 59.66 2021-06-11 4 A 0 12004 0.00 A 2031-06-10 Common Stock 12004 12004 D Shares subject to the option vest in 12 equal monthly installments on the same day of the month as the grant date, or if earlier, the day immediately before the day of the next annual meeting of stockholders. /s/ Peter Garcia, by power of attorney 2021-06-15