SEC Filings for ALX ONCOLOGY HOLDINGS INC (ALXO)

Last updated: 2026-03-23 21:09 UTC | Total filings: 397

Browse the latest SEC filings and forms submitted by ALX ONCOLOGY HOLDINGS INC (ALXO). Access annual reports, quarterly statements, and other official disclosures.

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Form Filing Date Description Link
4 March 23, 2026 4 View Document
4 March 23, 2026 4 View Document
10-K March 9, 2026 10-K View Document
3 March 5, 2026 3 View Document
4 March 5, 2026 4 View Document
8-K Feb. 27, 2026 8-K View Document
4 Feb. 20, 2026 4 View Document
4 Feb. 19, 2026 4 View Document
SCHEDULE 13G Feb. 9, 2026 - View Document
SCHEDULE 13G Feb. 6, 2026 - View Document
SCHEDULE 13D/A Feb. 4, 2026 - View Document
4 Feb. 4, 2026 - View Document
8-K Jan. 30, 2026 8-K View Document
8-K Jan. 30, 2026 8-K View Document
424B5 Jan. 30, 2026 424B5 View Document
4 Jan. 28, 2026 4 View Document
4 Jan. 28, 2026 4 View Document
4 Jan. 28, 2026 4 View Document
S-8 Jan. 21, 2026 S-8 View Document
4 Jan. 21, 2026 4 View Document
4 Jan. 21, 2026 4 View Document
4 Jan. 21, 2026 4 View Document
4 Jan. 21, 2026 4 View Document
4 Jan. 21, 2026 4 View Document
4 Jan. 21, 2026 4 View Document
8-K Jan. 21, 2026 8-K View Document
4 Jan. 7, 2026 4 View Document
SCHEDULE 13G/A Nov. 14, 2025 - View Document
SCHEDULE 13G/A Nov. 14, 2025 - View Document
10-Q Nov. 7, 2025 10-Q View Document
8-K Nov. 7, 2025 8-K View Document
SCHEDULE 13G/A Oct. 22, 2025 - View Document
4 Oct. 16, 2025 4 View Document
4 Oct. 16, 2025 4 View Document
4 Oct. 16, 2025 4 View Document
SCHEDULE 13G Oct. 8, 2025 - View Document
4 Sept. 19, 2025 4 View Document
4 Sept. 18, 2025 4 View Document
8-K Sept. 12, 2025 8-K View Document
4 Aug. 20, 2025 4 View Document
4 Aug. 19, 2025 4 View Document
4 Aug. 19, 2025 4 View Document
SCHEDULE 13G/A Aug. 14, 2025 - View Document
3 Aug. 13, 2025 3 View Document
4 Aug. 13, 2025 4 View Document
10-Q Aug. 12, 2025 10-Q View Document
8-K Aug. 12, 2025 8-K View Document
4 July 8, 2025 4 View Document
4 July 1, 2025 4 View Document
8-K June 12, 2025 8-K View Document
SCHEDULE 13G/A May 15, 2025 - View Document
SCHEDULE 13G/A May 15, 2025 - View Document
10-Q May 8, 2025 10-Q View Document
8-K May 8, 2025 8-K View Document
8-K April 25, 2025 8-K View Document
EFFECT April 24, 2025 - View Document
CORRESP April 23, 2025 - View Document
ARS April 21, 2025 ARS View Document
DEF 14A April 21, 2025 DEF 14A View Document
4 April 15, 2025 - View Document
4 April 15, 2025 - View Document
4 April 15, 2025 - View Document
4 April 15, 2025 - View Document
4 March 18, 2025 - View Document
4 March 18, 2025 - View Document
UPLOAD March 11, 2025 - View Document
10-K March 6, 2025 10-K View Document
S-3 March 6, 2025 S-3 View Document
8-K March 6, 2025 8-K View Document
8-K March 5, 2025 8-K View Document
4 Feb. 21, 2025 - View Document
4 Feb. 21, 2025 - View Document
4 Feb. 21, 2025 - View Document
SCHEDULE 13G/A Feb. 14, 2025 - View Document
4 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
3 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
3 Jan. 23, 2025 - View Document
3 Jan. 23, 2025 - View Document
4 Jan. 23, 2025 - View Document
8-K Jan. 22, 2025 8-K View Document
S-8 Jan. 17, 2025 S-8 View Document
8-K Jan. 17, 2025 8-K View Document
4 Jan. 8, 2025 - View Document
4 Jan. 2, 2025 - View Document
4 Jan. 2, 2025 - View Document
SC TO-I/A Dec. 31, 2024 SC TO-I/A View Document
SCHEDULE 13G Dec. 27, 2024 - View Document
SCHEDULE 13G/A Dec. 6, 2024 - View Document
4 Dec. 4, 2024 - View Document
4 Dec. 4, 2024 - View Document
4 Dec. 4, 2024 - View Document
SC TO-I Dec. 2, 2024 SC TO-I View Document
4 Nov. 19, 2024 - View Document
SC 13G/A Nov. 14, 2024 - View Document
8-K Nov. 14, 2024 8-K View Document
SC 13G/A Nov. 14, 2024 AMENDMENT NO. 1 TO SCHEDULE 13G View Document
SC 13G/A Nov. 14, 2024 AMENDMENT NO. 2 View Document
SC 13G/A Nov. 12, 2024 - View Document
8-K Nov. 7, 2024 8-K View Document
10-Q Nov. 7, 2024 10-Q View Document
SC 13G/A Oct. 10, 2024 - View Document
8-K Oct. 4, 2024 8-K View Document
SC 13G Aug. 22, 2024 - View Document
4 Aug. 16, 2024 - View Document
4 Aug. 16, 2024 - View Document
4 Aug. 16, 2024 - View Document
4 Aug. 16, 2024 - View Document
4 Aug. 16, 2024 - View Document
SC 13G Aug. 13, 2024 - View Document
10-Q Aug. 12, 2024 10-Q View Document
8-K Aug. 8, 2024 8-K View Document
4 Aug. 7, 2024 - View Document
3 Aug. 7, 2024 - View Document
8-K Aug. 6, 2024 8-K View Document
4 July 15, 2024 - View Document
144 July 11, 2024 - View Document
4 July 9, 2024 - View Document
4 July 3, 2024 - View Document
4 July 3, 2024 - View Document
4 July 3, 2024 - View Document
4 July 2, 2024 - View Document
4/A June 24, 2024 - View Document
4 June 17, 2024 - View Document
8-K June 17, 2024 8-K View Document
4 June 14, 2024 - View Document
4 June 14, 2024 - View Document
4 June 14, 2024 - View Document
4 June 6, 2024 - View Document
144 June 4, 2024 - View Document
4 May 15, 2024 - View Document
144 May 13, 2024 - View Document
10-Q May 9, 2024 10-Q View Document
8-K May 9, 2024 8-K View Document
4 May 8, 2024 - View Document
144 May 6, 2024 - View Document
8-K May 2, 2024 8-K View Document
DEFA14A May 2, 2024 DEFA14A View Document
ARS April 23, 2024 ARS View Document
DEF 14A April 22, 2024 DEF 14A View Document
4 April 18, 2024 - View Document
144 April 16, 2024 - View Document
4 April 5, 2024 - View Document
144 April 4, 2024 - View Document
4 March 18, 2024 - View Document
S-8 March 8, 2024 S-8 View Document
10-K March 7, 2024 10-K View Document
8-K March 7, 2024 8-K View Document
4 Feb. 16, 2024 - View Document
4 Feb. 16, 2024 - View Document
4 Feb. 16, 2024 - View Document
4 Feb. 16, 2024 - View Document
4 Feb. 16, 2024 - View Document
SC 13G/A Feb. 14, 2024 AMENDMENT NO. 1 View Document
SC 13D/A Feb. 14, 2024 SC 13D/A View Document
SC 13G/A Feb. 14, 2024 SC 13G/A View Document
SC 13G/A Feb. 9, 2024 - View Document
4 Jan. 5, 2024 FORM 4 SUBMISSION View Document
4 Jan. 3, 2024 FORM 4 SUBMISSION View Document
4 Jan. 3, 2024 FORM 4 SUBMISSION View Document
4 Jan. 3, 2024 FORM 4 SUBMISSION View Document
4 Jan. 3, 2024 FORM 4 SUBMISSION View Document
8-K Dec. 26, 2023 8-K View Document
SC 13D/A Dec. 20, 2023 SC 13D/A View Document
8-K Nov. 13, 2023 8-K View Document
10-Q Nov. 13, 2023 10-Q View Document
SC 13G Oct. 16, 2023 SC 13G View Document
SC 13G Oct. 13, 2023 - View Document
424B5 Oct. 6, 2023 424B5 View Document
8-K Oct. 6, 2023 8-K View Document
8-K Oct. 4, 2023 8-K View Document
424B5 Oct. 4, 2023 424B5 View Document
8-K Oct. 4, 2023 8-K View Document
4 Sept. 12, 2023 FORM 4 SUBMISSION View Document
EFFECT Sept. 8, 2023 - View Document
424B3 Sept. 8, 2023 424B3 View Document
CORRESP Sept. 7, 2023 - View Document
8-K Sept. 6, 2023 8-K View Document
UPLOAD Sept. 6, 2023 - View Document
S-3 Sept. 1, 2023 S-3 View Document
424B5 Aug. 25, 2023 424B5 View Document
8-K Aug. 10, 2023 8-K View Document
10-Q Aug. 10, 2023 10-Q View Document
4 July 27, 2023 FORM 4 SUBMISSION View Document
4 July 27, 2023 FORM 4 SUBMISSION View Document
4 July 27, 2023 FORM 4 SUBMISSION View Document
4 July 27, 2023 FORM 4 SUBMISSION View Document
4 July 7, 2023 FORM 4 SUBMISSION View Document
4 July 5, 2023 FORM 4 SUBMISSION View Document
4 July 5, 2023 FORM 4 SUBMISSION View Document
4 July 5, 2023 FORM 4 SUBMISSION View Document
4 July 5, 2023 FORM 4 SUBMISSION View Document
4 June 22, 2023 FORM 4 SUBMISSION View Document
4 June 22, 2023 FORM 4 SUBMISSION View Document
4 June 22, 2023 FORM 4 SUBMISSION View Document
4 June 22, 2023 FORM 4 SUBMISSION View Document
4 June 22, 2023 FORM 4 SUBMISSION View Document
4 June 22, 2023 FORM 4 SUBMISSION View Document
8-K June 20, 2023 8-K View Document
4 June 13, 2023 FORM 4 SUBMISSION View Document
8-K May 11, 2023 8-K View Document
10-Q May 11, 2023 10-Q View Document
ARS April 24, 2023 ARS View Document
DEF 14A April 24, 2023 DEF 14A View Document
8-K March 13, 2023 8-K View Document
S-8 March 9, 2023 S-8 View Document
8-K March 9, 2023 8-K View Document
10-K March 9, 2023 10-K View Document
SC 13G Feb. 14, 2023 SCHEDULE 13G View Document
SC 13G/A Feb. 9, 2023 - View Document
4 Jan. 3, 2023 FORM 4 SUBMISSION View Document
4 Jan. 3, 2023 FORM 4 SUBMISSION View Document
4 Jan. 3, 2023 FORM 4 SUBMISSION View Document
4 Jan. 3, 2023 FORM 4 SUBMISSION View Document
4 Dec. 20, 2022 FORM 4 SUBMISSION View Document
8-K Nov. 29, 2022 8-K View Document
4 Nov. 29, 2022 FORM 4 SUBMISSION View Document
3 Nov. 29, 2022 FORM 3 SUBMISSION View Document
10-Q Nov. 8, 2022 10-Q View Document
8-K Nov. 8, 2022 8-K View Document
8-K Oct. 31, 2022 8-K View Document
SC 13G/A Aug. 10, 2022 - View Document
4 Aug. 9, 2022 FORM 4 SUBMISSION View Document
4 Aug. 9, 2022 FORM 4 SUBMISSION View Document
4 Aug. 9, 2022 FORM 4 SUBMISSION View Document
4 Aug. 9, 2022 FORM 4 SUBMISSION View Document
8-K Aug. 8, 2022 8-K View Document
10-Q Aug. 8, 2022 10-Q View Document
4 June 16, 2022 FORM 4 SUBMISSION View Document
8-K June 16, 2022 8-K View Document
4 June 16, 2022 FORM 4 SUBMISSION View Document
4 June 16, 2022 FORM 4 SUBMISSION View Document
4 June 16, 2022 FORM 4 SUBMISSION View Document
4 June 16, 2022 FORM 4 SUBMISSION View Document
SC 13G/A June 10, 2022 SEC SCHEDULE 13G View Document
EFFECT May 31, 2022 - View Document
POS AM May 27, 2022 POS AM View Document
EFFECT May 25, 2022 - View Document
CORRESP May 24, 2022 - View Document
S-3/A May 13, 2022 S-3/A View Document
8-K May 9, 2022 8-K View Document
10-Q May 9, 2022 10-Q View Document
DEF 14A April 22, 2022 DEF 14A View Document
3 April 14, 2022 FORM 3 SUBMISSION View Document
4 April 14, 2022 FORM 4 SUBMISSION View Document
8-K April 12, 2022 8-K View Document
UPLOAD March 29, 2022 - View Document
S-3 March 25, 2022 S-3 View Document
S-8 Feb. 28, 2022 S-8 View Document
10-K Feb. 28, 2022 10-K View Document
8-K Feb. 28, 2022 Q4'21 8-K/PR View Document
SC 13G Feb. 9, 2022 - View Document
4 Feb. 8, 2022 FORM 4 SUBMISSION View Document
4 Feb. 7, 2022 FORM 4 SUBMISSION View Document
SC 13G/A Feb. 4, 2022 SEC SCHEDULE 13G View Document
4 Feb. 1, 2022 FORM 4 SUBMISSION View Document
424B5 Dec. 17, 2021 424B5 View Document
8-K Dec. 17, 2021 8-K View Document
4 Dec. 16, 2021 FORM 4 SUBMISSION View Document
4 Dec. 15, 2021 FORM 4 SUBMISSION View Document
4 Dec. 15, 2021 FORM 4 SUBMISSION View Document
4 Dec. 10, 2021 FORM 4 SUBMISSION View Document
4 Dec. 10, 2021 FORM 4 SUBMISSION View Document
4 Nov. 23, 2021 FORM 4 SUBMISSION View Document
10-Q Nov. 12, 2021 Q3'21 10-Q View Document
8-K Nov. 12, 2021 Q3'21 8-K View Document
4 Oct. 20, 2021 FORM 4 SUBMISSION View Document
4 Oct. 20, 2021 FORM 4 SUBMISSION View Document
4 Oct. 19, 2021 FORM 4 SUBMISSION View Document
4 Oct. 12, 2021 FORM 4 SUBMISSION View Document
8-K Oct. 7, 2021 SCALMIBIO ACQUISITION View Document
4 Sept. 21, 2021 FORM 4 SUBMISSION View Document
4 Sept. 17, 2021 FORM 4 SUBMISSION View Document
4 Sept. 13, 2021 FORM 4 SUBMISSION View Document
SC 13G Sept. 10, 2021 SEC SCHEDULE 13G View Document
8-K Aug. 27, 2021 8-K View Document
4 Aug. 24, 2021 FORM 4 SUBMISSION View Document
4 Aug. 20, 2021 FORM 4 SUBMISSION View Document
4 Aug. 18, 2021 FORM 4 SUBMISSION View Document
S-3ASR Aug. 13, 2021 S-3ASR View Document
10-Q Aug. 12, 2021 10-Q View Document
8-K Aug. 12, 2021 8-K View Document
4 Aug. 11, 2021 FORM 4 SUBMISSION View Document
4 Aug. 3, 2021 FORM 4 SUBMISSION View Document
4 Aug. 3, 2021 FORM 4 SUBMISSION View Document
4 Aug. 3, 2021 FORM 4 SUBMISSION View Document
4 Aug. 3, 2021 FORM 4 SUBMISSION View Document
4 July 20, 2021 FORM 4 SUBMISSION View Document
4 July 14, 2021 FORM 4 SUBMISSION View Document
4 June 22, 2021 FORM 4 SUBMISSION View Document
4 June 15, 2021 FORM 4 SUBMISSION View Document
4 June 15, 2021 FORM 4 SUBMISSION View Document
8-K June 15, 2021 8-K View Document
4 June 15, 2021 FORM 4 SUBMISSION View Document
SC 13D/A June 15, 2021 - View Document
4 June 15, 2021 FORM 4 SUBMISSION View Document
4 June 15, 2021 FORM 4 SUBMISSION View Document
4 June 14, 2021 FORM 4 SUBMISSION View Document
4 May 20, 2021 FORM 4 SUBMISSION View Document
4/A May 19, 2021 FORM 4/A SUBMISSION View Document
10-Q May 17, 2021 10-Q View Document
8-K May 17, 2021 8-K View Document
4 May 11, 2021 FORM 4 SUBMISSION View Document
4 May 5, 2021 FORM 4 SUBMISSION View Document
3 May 5, 2021 FORM 3 SUBMISSION View Document
8-K May 4, 2021 8-K View Document
DEF 14A April 29, 2021 DEFINITIVE PROXY STATEMENT View Document
4 April 21, 2021 FORM 4 SUBMISSION View Document
4 April 13, 2021 FORM 4 SUBMISSION View Document
4 March 26, 2021 FORM 4 SUBMISSION View Document
8-K March 25, 2021 8-K PAO RESIGNATION View Document
4 March 24, 2021 FORM 4 SUBMISSION View Document
10-K March 18, 2021 10-K View Document
S-8 March 18, 2021 S-8 View Document
8-K March 18, 2021 8-K View Document
8-K March 15, 2021 8-K View Document
4 March 12, 2021 FORM 4 SUBMISSION View Document
4 Jan. 29, 2021 FORM 4 SUBMISSION View Document
4 Jan. 28, 2021 FORM 4 SUBMISSION View Document
8-K Dec. 23, 2020 8-K View Document
4 Dec. 15, 2020 FORM 4 SUBMISSION View Document
424B4 Dec. 11, 2020 424B4 View Document
S-1MEF Dec. 9, 2020 S-1MEF View Document
EFFECT Dec. 9, 2020 - View Document
S-1 Dec. 7, 2020 S-1 View Document
CORRESP Dec. 7, 2020 - View Document
CORRESP Dec. 7, 2020 - View Document
UPLOAD Nov. 25, 2020 - View Document
DRS Nov. 24, 2020 - View Document
10-Q Nov. 12, 2020 10-Q View Document
8-K Nov. 12, 2020 8-K View Document
SC 13D Oct. 1, 2020 - View Document
8-K Aug. 27, 2020 8-K View Document
10-Q Aug. 27, 2020 10-Q View Document
SC 13D Aug. 26, 2020 - View Document
SC 13D July 31, 2020 SC 13D View Document
SC 13G July 29, 2020 SCHEDULE 13G View Document
4 July 22, 2020 FORM 4 SUBMISSION View Document
3/A July 22, 2020 FORM 3/A SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
4 July 21, 2020 FORM 4 SUBMISSION View Document
8-K July 21, 2020 8-K View Document
4 July 21, 2020 - View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
424B4 July 17, 2020 424B4 View Document
S-8 July 17, 2020 S-8 View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
4 July 17, 2020 FORM 4 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 - View Document
S-1MEF July 16, 2020 S-1MEF View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
EFFECT July 16, 2020 - View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
CERT July 16, 2020 - View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
3 July 16, 2020 FORM 3 SUBMISSION View Document
CORRESP July 14, 2020 - View Document
CORRESP July 14, 2020 - View Document
S-1/A July 13, 2020 AMENDMENT NO. 1 TO FORM S-1 View Document
8-A12B July 13, 2020 8-A12B View Document
CORRESP July 2, 2020 - View Document
CORRESP June 26, 2020 - View Document
S-1 June 26, 2020 FORM S-1 View Document
UPLOAD June 24, 2020 - View Document
DRS/A June 12, 2020 - View Document
DRSLTR June 12, 2020 - View Document
UPLOAD June 2, 2020 - View Document
DRSLTR May 5, 2020 - View Document
DRS May 5, 2020 - View Document