Break Boundaries. Ignite Change.

Nasdaq: IOBT

Corporate Presentation

April 2024

© 2024 IO Biotech, Inc.

Non-confidential Overview

DISCLAIMER | Forward Looking Statements

Certain information contained in this presentation includes "forward-looking statements", within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, related to our business plan, clinical trials and regulatory submissions. We may, in some cases, use terms such as "may," "should," "would," "expects," "plans," "anticipates," "could," "intends," "target," "projects," "contemplates," "believes," "estimates," "predicts," "potential" or "continue" or other words that convey uncertainty of the future events or outcomes to identify these forward-looking statements. Our forward- looking statements are based on current beliefs and expectations of our management team that involve risks, potential changes in circumstances, assumptions, and uncertainties. Any or all of the forward-looking statements may turn out to be wrong or be affected by inaccurate assumptions we might make or by known or unknown risks and uncertainties. These forward-looking statements are subject to risks and uncertainties including risks related to the execution of our business plan, success and timing of our clinical trials or other studies and the other risks set forth in our filings with the U.S. Securities and Exchange Commission. For all these reasons, actual results and developments could be materially different from those expressed in or implied by our forward-looking statements. You are cautioned not to place undue reliance on these forward-looking statements, which are made only as of the date of this presentation. We undertake no obligation to publicly update such forward-looking statements to reflect subsequent events or circumstances.

Non-confidential Overview

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HIGHLIGHTS | Break Boundaries. Ignite Change.

1

3

3

Indications:

17

T-win

Melanoma

platform

SCCHN

Pipeline programs

NSCLC

Patent Families

Focused on improving clinical

effect without adding systemic 80%toxicity 50%

Providing rapid

and durable

responses

25.5

Months mPFS*

ORR*CRR*

IO102-IO103

3Q24

in Ph. 3

Pivotal trial in advanced

Ph. 3 interim analysis

melanoma fully enrolled

outcome

2025

Potential US market entry

* Results from phase 1/2 MM1636 Melanoma

© 2024 IO Biotech, Inc.

Non-confidential Overview

CONTENT

PATIENT AND MARKET PERSPECTIVE

1

Non-confidential Overview

4

MARKET | Solid tumors are often detected at advanced stages, or progressing quickly to advanced stage, increasing the mortality rate

Squamous Cell Carcinoma of

Non-Small Cell Lung Cancer

Melanoma

the Head and Neck* (SCCHN)

Treatment** (NSCLC)

~325,000

New cases in 2020,

worldwide

~57,000

~744,000

Deaths in 2020,

New cases in 2020,

worldwide

worldwide

~364,000

~1,875,000

~1,526,000

Deaths in 2020,

New cases in 2020,

Deaths in 2020,

worldwide

worldwide

worldwide

Global

Worldwide, melanoma is the 17th most

Worldwide, SCCHN is the 6th most diagnosed

Worldwide, lung cancer is the 2nd most diagnosed

cancer

diagnosed cancer and 5th most common

cancer

cancer and NSCLC is estimated to account for

incidence

85% of all lung cancer diagnoses

cancer in the US

Stages at

Stage I/II and III/IV melanoma accounts for 84%

Stage I/II, III and IV SCCHN accounts for 28%, 55%

Stage I, II, III and IV lung cancer accounts for 21%,

diagnosis

and 16% of the new cases, respectively

and 17% of the new cases, respectively

5%, 23% and 44% of the new cases, respectively

5-year

The 5-year survival rate for patients in stage IV is

The 5-year survival rate is 50%2

The 5-year relative survival rate for patients in

survival rate

22.5%1

stage IV is 28% 3

*Data represented here is a sum of incidence of Lip, Oral Cavity, Larynx, Hypopharynx, and Oropharynx cancer ** Data represented here corresponds to 85% of

the incidence of trachea, bronchus and lung.Non-confidentialOverview5 Source: International agency for research on cancer 1. Melanoma Research Alliance; 2. National Library of Medicine, The Journal of Pain3. Cancer.Net

MARKET | Melanoma, SCCHN, and NSCLC are worldwide cancer threats, but especially present in Europe, North America and Oceania

Melanoma, SCCHN, and NSCLC incidence in 2020, age standardized rate (ASR) per 100,000

Northern 16,1

9,0

11,4

11,0

Europe

America

25,0

0,4

8,1

27,71

Asia

19,5

0,9

3,7

Latin America and 2,3

5,8

Africa

5,3

the Caribbean

30,1

11,2

10,2

Oceania

Melanoma

20,4

SCCHN

NSCLC

Key takeaways:

  • Worldwide, melanoma is the 17th most diagnosed cancer and 5th most common cancer in the US
  • Worldwide, SCCHN is the
    6th most diagnosed cancer (sum of Lip, Oral Cavity, Larynx, Hypopharynx, and Oropharynx cancer)
  • Worldwide, lung is the 2nd most diagnosed cancer and NSCLC is estimated to account for 85% of all lung cancer diagnoses

*Germany, France, Italy, Spain, UK

Non-confidential Overview

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Sources: GLOBOCAN, International Agency for Research Cancer, 2020

MARKET | Expected growth in global cancer drug sales for 2028 indicates a need for new and effective treatments

Forecast global Melanoma

Drug Sales

in USD billions

16

US

+11%

14.3

14

12

5.4

10

7.6

8

6

3.3

8.9

4

4.3

2

2022

2028

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

Forecast global SCCHN Drug Sales

in USD billions

US

+9% 4.7

2.2

2.8

1.5

2.5

1.4

20222028

60

50

40

30

20

10

0

Forecast global NSCLC Drug Sales

in USD billions

US

+11% 54.4

27.2

29.8

15.5

27.3

14.4

20222028

Key takeaways:

  • All three indications are projected to grow at a similar rate (CAGR between 9% and 11%) with Melanoma having the fastest estimated growth rate.
  • NSCLC has the highest projected market value and given its large market size, even a small market share could be substantial.

Non-confidential Overview

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CONTENT

OUR UNIQUE VALUE PROPOSITION

2

Non-confidential Overview

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UNIQUE VALUE PROPOSITION | T-Win®investigational IO102-IO103cancer vaccine with dual mechanism of action and POC with high clinical efficacy

Clinical POC

  • Enhanced activity outcomes when administered in combination with anti PD-1 therapy
    high ORR of 80%, with 50% of patients reaching a CR
  • Duration of response demonstrated rapid and durable responses

No added systemic toxicity

Favorable safety & tolerability Safety profile of IO102-IO103combined with anti PD-1in Ph 1/2 comparable to anti-PD-1mono therapy

Broad applicability

PROOF POINTS

Clinical data showing

T-win® cancer

vaccine technology

activity without

platform with a dual

added toxicity

mechanism of

Unique Value

action

Proposition

PROOF POINTS

T-win® platform with a dual mechanism of action

  • Targets both
    the tumor and the immuno- suppressive cells in the TME
  • Enhanced activity
    by modulating the TME and creating a more pro-inflammatoryenvironment

Multi-dimensional level

  • Potential to broad application to different cancer indications
  • Advances
    the oncology treatment paradigm
  • Responses across patient subgroups BRAF mutation, PD-L1status, LDH.

Time to treatment

Off-the-shelf

therapeutic cancer

vaccines

PROOF POINTS

Minimized time to treatment

  • Preparation and administration designed as readily available off-theshelf vaccine providing immediate treatment

*HCPs = healthcare professionals

Non-confidential Overview

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Sources: Munir et al. 2012; Munir et al. 2013; Ahmad et al. 2014 ;Andersen 2019 ; Kjeldsen et al, 2021

UNIQUE VALUE PROPOSITION | Preliminary physician feedback from market research highlights the potential of IO Biotech's vaccine IO102-IO103

(if) the ORR is superior to ipi + nivo, this product will become the new standard of care

I would probably use this for all my patients regardless of BRAF or PD-L1status

- US KOL

- US KOL

Encouraging that there are no trade-offsbetween AEs and efficacy

- KOL

Excited to help more patients and see how benefit would be in long term

- KOL

It can be broadly expanded to a larger subset of patients and deliver great efficacy

- KOL

Source: Physician market research , Q4 2023 ; Brainsurgery and IO Biotech (2023); reactions to Ph1/2 data and target product profile

Non-confidential Overview

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Disclaimer

IO Biotech Inc. published this content on 16 April 2024 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 17 April 2024 11:09:04 UTC.