September 28, 2022

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This presentation contains forward-looking statements that involve substantial risks and uncertainties. Forward-looking statements include statements regarding future results of operations and financial position, business strategy, product candidates, planned preclinical studies and clinical trials, results of clinical trials, research and development costs, regulatory approvals, timing and likelihood of success, plans and objectives of management for future operations, as well as statements regarding industry trends. Such forward-looking statements are based on ALX Oncology's beliefs and assumptions and on information currently available to it on the date of this presentation. Forward-looking statements may involve known and unknown risks, uncertainties and other factors that may cause ALX Oncology's actual results, performance or achievements to be materially different from those

expressed or implied by the forward-looking statements. These and other risks are described more fully in ALX Oncology's filings with

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ALX ONCOLOGY (NASDAQ: ALXO) ADVANCING A HIGHLY DIFFERENTIATED IMMUNO-ONCOLOGY PIPELINE LED BY EVORPACEPT, A CD47 INNATE IMMUNE SYSTEM CHECKPOINT INHIBITOR

Evorpacept: designed to maximize a patient's immune response

Acts on CD47 as a checkpoint inhibitor, a key mechanism tumors use to evade the immune system

  • Activates the immune system without eliminating healthy cells that express CD47

Demonstrated activity in both solid and liquid tumors

  • Three ongoing randomized Phase 2 studies underway in solid tumors
  • Two studies underway in combination with antibody drug conjugates (ADCs)
  • Hematology studies ongoing

Potential cornerstone treatment for a broad range of cancers

Continuing to build a pipeline based on expertise in protein engineering and oncology

2023 IND planned for ALTA-002*

  • Early preclinical development of ADC platform.

Strong financial position

  • Expected cash runway through

the fourth quarter of 2024.

  • Cash, cash equivalents and investments of $324.2M as of June 30, 2022.

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* Through 50/50 joint collaboration.

EVORPACEPT'S DESIGN ENABLES BROAD POTENTIAL UTILITY IN COMBINATION WITH MANY TYPES OF CANCER THERAPY

Modality

Target

Evorpacept clinical trials

HNSCC

I/O

PD(L)1

CRC*

Ovarian*

HER2

Gastric

Breast

Targeted mAbs

CD20

NHL

Follicular*

EGFR

CRC*

ADCs

Nectin-4

Urothelial

HER2

Breast

Chemo

AZA

MDS

AML

*Investigator sponsored trial

Ongoing early and late stage clinical trials designed to demonstrate expansive clinical opportunity in many tumor types

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ALX PIPELINE

Indication

HNSCC

Head AndNeck Squamous Cell

Studies

TUMORS

Carcinoma

Junction Cancer

GC

Combination

Gastric/Gastroesophageal

SOLID

Urothelial Cancer

Evorpacept

HEMATOLOGY

Breast Cancer

NHL

MDS

Myelodysplastic Syndromes

AML

Acute Myeloid Leukemia

Non-Hodgkin's Lymphoma

ALTA 002*

Advanced Cancer

Combination Agent

Discovery

IND Enabling

Phase 1

Phase 2

Phase 3

Fast Track

Collaboration

Partner

Keytruda

(ASPEN-03)

Keytruda + 5FU + Platinum

(ASPEN-04)

Herceptin

(ASPEN-01)

Herceptin + Cyramza +

Paclitaxel (ASPEN-06)

Padcev

(ASPEN-07)

Zanidatamab

Enhertu

(I-SPY)

Azacitidine

(ASPEN-02)

Azacitidine + Venclexta

(ASPEN-05)

Rituximab

(ASPEN-01)

*SIRPα Toll-like receptor agonist antibody conjugate (TRAAC)

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ALX Oncology Holdings Inc. published this content on 28 September 2022 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 28 September 2022 11:15:05 UTC.