Achilles Therapeutics

AI-Powered Precision Cell Therapy Targeting All Tumor Cells

March 2023

Non-Confidential

© Achilles Therapeutics plc 2023

Forward-Looking Statements / Disclaimers

This presentation contains "forward-looking statements," including statements regarding the proposed development plans and timelines for the Company's product candidates and the success, cost and timing of its research activities and clinical trials. Forward-looking statements can generally be identified by the use of words such as "anticipate," "believe," "continue," "could," "estimate," "expect," "forecast," "intend," "may," "plan," "project," "potential," "seek," "should," "think," "will," "would" and similar expressions, or they may use future dates.

Such forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from any future results, performance or achievements expressed or implied by such statements. These and other risks which may impact management's expectations are described in greater detail under the heading "Risk Factors" in the Company's quarterly report on Annual Report on Form 20-F and in any subsequent periodic or current report that the Company files with the SEC.

All forward-looking statements reflect the Company's estimates only as of the date of this release (unless another date is indicated) and should not be relied upon as reflecting the Company's views, expectations or beliefs at any date subsequent to the date of this release.

Non-Confidential

© Achilles Therapeutics plc 2023

1

Transforming the treatment of solid tumors with precision T cell therapy

Company

Nasdaq IPO:

Early clinical

Clinical

founded

ACHL

proof of concept

update

2016

2021

2022

2023

Global Headquarters

U.S. Headquarters

London, UK

Philadelphia, PA

Two active clinical

programs

~200 employees

$173M cash

Non-Confidential

© Achilles Therapeutics plc 2023

2

Targeting clonal neoantigens with patented technology, linking mechanism and potency

Clonal neoantigens

Sub-clonal neoantigens

T cells

Clonal neoantigens:

Only target present on

a novel and ideal cancer

all cancer cells, absent

target

from healthy tissue

Unique and world leading

Only neoantigen

capability to identify

platform validated on

clonal neoantigens

real world data

Clonal neoantigens

Tumor

World class scientific

Demonstrated target

engagement supporting

platform

mechanism of action

Non-Confidential

© Achilles Therapeutics plc 2023

3

Clinical-stage precision targeting for solid tumors using clonal neoantigen-reactive T cells (cNeT)

Targeting clonal neoantigens: a novel class of cancer target present on all tumor cells

We have developed a proprietary patent protected AI platform (PELEUS®) that is validated on real world patient data (TRACERx) and which can be used to identify personal clonal neoantigens

Controlled precision therapy

Scientific platform that can quantify, characterize and track tumor reactive T cells, target engagement and mechanism of action

Emerging PoC for cNeT in NSCLC

Durable disease control achieved with cNeT monotherapy, 71% (5/7) NSCLC patients (including 1 PR and 4 SDs) with encouraging safety and tolerability

Near-term clinical milestones

Clinical and translational updates in 2023: 15-20 new patients across NSCLC (CHIRON) monotherapy and melanoma (THETIS) monotherapy and in combination with check-point inhibitor (anti-PD-1)

Strong cash position supports all planned operations into mid-2025

Cash runway of $173M (£143M) as of December 31, 2022

Non-Confidential

© Achilles Therapeutics plc 2023

4

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Achilles Therapeutics plc published this content on 07 March 2023 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 07 March 2023 12:13:04 UTC.