Management's discussion and analysis of financial condition and results of operation

The following discussion and analysis of our financial condition and results of operations should be read together with our unaudited condensed consolidated financial statements and related notes appearing elsewhere in this Quarterly Report on Form 10-Q and our audited consolidated financial statements and related notes for the year ended December 31, 2021 included in our Annual Report on Form 10-K filed with the SEC. Some of the information contained in this discussion includes forward-looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in the Special note regarding forward-looking statements included in this Quarterly Report on Form 10-Q, and the "Risk factors" section of this Quarterly Report on Form 10-Q, our actual results could differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis.

Overview

We are a clinical-stage biopharmaceutical company pioneering the discovery and development of a new generation of highly differentiated immuno-oncology therapeutics for people living with cancer. We leverage our deep understanding of tumor immunology and immunosuppressive pathways to design novel product candidates with the aim of restoring the immune response against cancer. Our innovative pipeline includes two clinical-stage programs targeting novel, de-risked immuno-oncology pathways. Each of our therapies in development has optimized pharmacologic properties designed to improve clinical outcomes.

Our lead antibody product candidate, EOS-448, also known as GSK4428859A, is an antagonist of TIGIT, or T-cell immunoreceptor with lg and ITIM domains, an immune checkpoint with multiple mechanisms of action. EOS-448 was selected for its affinity for TIGIT, its potency and its potential to engage the Fc gamma receptor, or Fc?R, to activate dendritic cells, natural killer cells and macrophages and to promote cytokine release, activation of antigen presenting cells and antibody-dependent cellular cytotoxicity, or ADCC, activity. In 2020, we started an open-label Phase 1/2a clinical trial of EOS-448 in adult cancer patients with advanced solid tumors. In April 2021, we reported preliminary safety, pharmacokinetic, and pharmacodynamic data, indicating target engagement and early evidence of clinical activity as a single agent.

On June 11, 2021, our wholly owned subsidiary, iTeos Belgium S.A., and GlaxoSmithKline Intellectual Property (No. 4) Limited, or GSK, executed a Collaboration and License Agreement, or the GSK Collaboration Agreement, which became effective on July 26, 2021. Pursuant to the GSK Collaboration Agreement, we agreed to grant GSK a license under certain of our intellectual property rights to develop, manufacture, and commercialize products comprised of or containing EOS-448, which license is exclusive in all countries outside of the United States and co-exclusive, with iTeos, in the United States. GSK and iTeos intend to develop EOS-448 in combination, including with other oncology assets of GSK, and iTeos and GSK will jointly own the intellectual property created under the GSK Collaboration Agreement that fcovers such combinations. In partnership with GSK, we have dosed the first patients in a clinical trial assessing the doublet of GSK's anti-PD-1 (dostarlimab) with EOS-448. We and GSK also are initiating Phase 1b trials with novel triplets, including dostarlimab with EOS-448 and inupadenant as well as EOS-448 with dostarlimab and GSK's anti-CD96 antibody, GSK'608.

In September 2021, we dosed the first patients in a Phase 1/2 clinical trial of EOS-448 in combination with pembrolizumab and in combination with our A2AR antagonist inupadenant in patients with solid tumors. We continue to explore EOS-448 in combination with pembrolizumab, dostarlimab or inupadenant in patients with solid tumors in ongoing Phase 1b trials.

Based on favorable preclinical data generated in collaboration with Fred Hutchinson Cancer Research Center, we are enrolling patients in an open-label dose-escalation/expansion Phase 1/2 trial evaluating the safety, tolerability and preliminary activity of EOS-448 as monotherapy and in combination with Bristol Myers Squibb's iberdomide - a novel, potent oral cereblon E3 ligase modulator (CELMoD®) compound with enhanced tumoricidal and immune-stimulatory effects compared with immunomodulatory (IMiD®) agents - with or without dexamethasone, in adults with relapsed or refractory multiple myeloma.

We are also advancing inupadenant, a next-generation adenosine A2A receptor antagonist tailored to overcome the specific adenosine-mediated immunosuppression found in tumor microenvironment, into proof-of concept trials in several indications following encouraging single-agent activity in Phase 1. We are investigating inupadenant in an open-label



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multi-arm Phase 1/2a clinical trial in adult cancer patients with advanced solid tumors. The single-agent dose-escalation and expansion portions of our Phase 1/2a clinical trial of inupadenant have demonstrated durable monotherapy antitumor activity in patients with advanced solid tumors and safety consistent with previously reported results. As part of this monotherapy assessment of inupadenant, we identified a potential predictive biomarker and we are enrolling patients in the biomarker cohort of the ongoing Phase 1b/2a trial. In 2022, we plan to initiate a randomized Phase 2 trial in a solid tumor indication to evaluate the combination of inupadenant with chemotherapy compared to standard of care chemotherapy alone. We have completed enrollment in the safety evaluation portion of the clinical trial of inupadenant in combination with chemotherapy and with pembrolizumab, as well as the monotherapy expansion cohort in prostate cancer. We have initiated an expansion arm evaluating inupadenant in combination with pembrolizumab in patients with PD-1-resistant melanoma, currently in an ongoing trial. In addition, we are evaluating a salt form of inupadenant in a Phase 1 study.

Our internal research and development team has extensive expertise in tumor immunology, characterization of immunosuppressive mechanisms in the tumor microenvironment, pharmacology and translational medicine. We have also built discovery capabilities to develop both small molecules and antibodies with differentiated and optimized product profiles for targets validated by a strong scientific rationale. We continue to progress research programs focused on additional targets that complement our TIGIT and A2AR programs or address additional immunosuppressive pathways. In September 2021, we nominated a product candidate in the adenosine pathway for Investigational New Drug, or IND, enabling studies. Our expertise also allows us to integrate a biomarker-rich strategy into our clinical programs to measure the activity of a product candidate in patients, seek to optimize combination agents and identify patients we deem most likely to benefit from treatment.

Since our inception in August 2011, we have devoted substantially all of our resources to organizing and staffing our company, business planning, raising capital, conducting discovery and research activities, filing patent applications, identifying potential product candidates, undertaking preclinical studies and clinical trials and establishing arrangements with third parties for the manufacture of initial quantities of our product candidates and component materials. To date, we have financed our operations primarily through license and collaboration revenue generated through the GSK Collaboration Agreement and through our IPO. Through March 31, 2022, we had raised an aggregate of $210.6 million of net proceeds from the IPO and $177.1 million from the sale of preferred stock and received an up-front payment of $625.0 million with respect to the GSK Collaboration Agreement. As of March 31, 2022, our principal source of liquidity was cash and cash equivalents, which totaled $824.0 million.

We expect to continue to incur significant expenses in connection with ongoing development activities, particularly if and as we:

continue preclinical studies and clinical trials and initiate new clinical trials for our product candidates;

pursue regulatory approvals for our product candidates;

advance the development of our product candidate pipeline;

continue research activities as we seek to discover and develop additional product candidates;

obtain, maintain, expand and protect our intellectual property portfolio;

hire additional research and development, clinical and commercial personnel;

scale up our clinical and regulatory capabilities; and

add operational, financial and management information systems and personnel, including personnel to support our research and development programs, any future commercialization efforts and our transition to operating as a public company.

Impact of COVID-19

With the ongoing concern related to the COVID-19 pandemic during 2021 and the first three months of 2022, we have maintained our business continuity plans to address and mitigate the impact of the COVID-19 pandemic on our business. In March 2020, to protect the health of our employees and their families and communities, we restricted access to our offices to personnel who performed critical activities that must be completed on-site, limited the number of such personnel that could be present at its facilities at any one time, and requested that most of our employees work remotely. In May 2020, as certain states eased restrictions, we established new protocols to better allow its full laboratory staff access to our facilities. These protocols included several shifts working over a seven-day-week protocol. With increased availability of vaccines and public health guidelines evolving to reflect their availability, we have shifted to a hybrid model



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for all our employees. We will continue to monitor and make adjustments in response to the public health environment, together with local, state and federal guidance regarding workplace protective measures. We expect to continue incurring additional costs to ensure we adhere to the guidelines instituted by the Centers for Disease Control and Prevention, or CDC, and to provide a safe working environment to our onsite employees.

While the ongoing COVID-19 pandemic has not significantly impacted our business or results of operations, the future impact of the COVID-19 pandemic on our industry, the healthcare system, our development timelines for EOS-448 and inupadenant, our preclinical research and development, and our current and future operations and financial condition will depend on future developments, which are highly uncertain and cannot be predicted with confidence. These developments include the scope, severity and duration of the COVID-19 pandemic, the identification of additional variants of COVID-19, the availability and utilization of vaccines and treatments for COVID-19, the actions taken to contain the pandemic or mitigate its impact, and the direct and indirect economic effects of the pandemic and containment measures, among others particularly in the geographies where we, our third party manufacturers, contract research organizations (CROs) or current and planned clinical trial sites operate. Disruptions to the global economy, disruption of global healthcare systems, and other significant impacts of the COVID-19 pandemic could have a material adverse effect on our business, financial condition, results of operations and growth prospects. See "Risk factors" for a discussion of the potential adverse impact of COVID-19 on our business, results of operations and financial condition.

Components of our results of operations

Revenue

To date, our revenues have been derived from the upfront payment associated with the GSK Collaboration Agreement.

For all collaboration agreements, no development or commercial milestones were included in the transaction price at inception, as all milestone amounts were fully constrained. As part of our evaluation of the constraint, we considered numerous factors, including that receipt of the milestones is outside our control and contingent upon success in future clinical trials and the licensee's efforts. Any consideration related to sales-based milestones will be recognized when the related sales occur as they were determined to relate predominantly to the license granted to GSK and therefore have also been excluded from the transaction price. We are applying the royalty exception for sales-based royalties and will not recognize revenue until the subsequent sale of product occurs.

Research and development expenses

Research and development expenses consist primarily of costs incurred for the development of our product candidates, which include:

costs to obtain licenses to intellectual property and related future payments should certain success, development and regulatory milestones be achieved;

employee-related expenses, including salaries, benefits and stock-based compensation expense;

expenses incurred under agreements with CROs, contract manufacturing organizations, or CMOs, and independent contractors that conduct research and development, preclinical and clinical activities on our behalf;

costs of purchasing lab supplies and non-capital equipment used in our preclinical activities and in manufacturing clinical study materials through CMOs;

consulting and professional fees related to research and development activities; and

facility costs, depreciation, and other expenses, which include direct and allocated expenses for rent and maintenance of facilities, insurance, and other supplies.

We expense research and development costs as incurred. We recognize costs for certain development activities, such as preclinical studies and clinical trials, based on an evaluation of the progress to completion of specific tasks using information provided to us by our vendors, such as patient enrollment or clinical site activations for services received and efforts expended.

Research and development activities are central to our business model. We expect research and development costs to increase significantly for the foreseeable future as our current development programs progress and new programs are added.

Because of the numerous risks and uncertainties associated with product development, we cannot determine with certainty the duration and completion costs of the current or future preclinical studies and clinical trials or if, when, or to



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what extent we will generate revenues from the commercialization and sale of any product candidates that receive regulatory approval. We may never succeed in achieving regulatory approval for our product candidates. The duration, costs and timing of preclinical studies and clinical trials and development of our product candidates will depend on a variety of factors, which could all be impacted by the ongoing COVID-19 pandemic, including, but not limited to:

successful enrollment in, and completion of, clinical trials;

receipt of marketing approvals from applicable regulatory authorities;

successful completion of preclinical studies and IND-enabling studies;

establishing commercial manufacturing capabilities or making arrangements with third-party manufacturers;

obtaining and maintaining patent and trade secret protection and non-patent exclusivity;

launching commercial sales of the product, if and when approved, whether alone or in collaboration with others;

acceptance of a product, if and when approved, by patients, the medical community and third-party payors;

effectively competing with other therapies and treatment options;

a continued acceptable safety profile following approval;

enforcing and defending intellectual property and proprietary rights and claims; and

A change in the outcome of any of these factors could mean a significant change in the costs and timing associated with the development of our current and future preclinical and clinical product candidates. For example, if the FDA or comparable foreign regulatory authority were to require us to conduct clinical trials beyond those that we currently anticipate will be required for the completion of clinical development, or if we experience significant delays in execution of or enrollment in any of our preclinical studies or clinical trials, we could be required to expend significant additional financial resources and time on the completion of preclinical and clinical development.



The following table summarizes our principal product development programs,
including direct research and development expenses allocated to each clinical
product candidate:


                                                 Three Months Ended
                                                      March 31,
(in thousands)                                    2022          2021

Direct research and development expenses by

program:


EOS-448                                        $    7,172     $  2,428
Inupadenant                                         6,173        4,323
Other non-clinical programs                         2,822        1,551

Indirect research and development expenses (1) 4,929 3,341 Total research and development expense $ 21,096 $ 11,643

(1)

The substantial majority of these costs relate to the EOS-448 and inupadenant programs. The majority of these costs are payroll and related costs for our employees performing in-house research and development activities and the remainder represents other research and development costs.

General and administrative expenses

General and administrative expenses consist primarily of employee-related expenses, including salaries, benefits and stock-based compensation, for personnel in executive, finance, business development, facility operations and administrative functions. Other significant costs include facility costs not otherwise included in research and development expenses, legal fees relating to patent and corporate matters and fees for accounting, tax and consulting services.

Grant income

We have agreements with granting agencies whereby we receive funding under grants that partially or fully reimburse us for eligible research and development expenditures. Certain grant agreements require us to repay the funding depending on whether we decide to pursue commercial development or out-licensing of any drug candidate that is produced from the research program. The repayment provision includes a portion that is fixed (corresponding to 30% of the grant), payable in annual installments, which is effective unless we decide not to pursue commercial development or



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out licensing of the drug candidate. The repayment provision also includes a potential obligation to pay a royalty that is contingent upon achieving sales of a product developed through the program. The maximum amount payable to the granting agency under each grant, including the fixed repayments, the royalty on revenue and the interest thereon, is twice the amount of funding received.

Research and development tax credits

Our wholly owned subsidiary iTeos Belgium S.A., as a Belgian biotechnology company, qualifies for a cash-based tax credit on research and development expenses. The credit is calculated based on a percentage of eligible research and development expenses defined by the Belgian government for each fiscal year (13.5% for 2022 and 2021) and then applying the effective tax rate to that result. The research and development tax credits are refundable to us if we are unable to use the credits to offset income taxes for the five subsequent tax years. We record a receivable and other income as the qualified expenses are incurred, as we are reasonably assured that the credit will be received, based upon our history of filing for the tax credits. Research and development tax credits receivable where we expect to receive refunds more than one year after the balance sheet date are classified as noncurrent in the condensed consolidated balance sheet.

Other income (expense), net

Other income (expense), net includes income and expenses that do not fall within other categories of the statement of operations and comprehensive income (loss). Items included are interest income, bank fees and gain or loss on foreign currency transactions.

Income taxes

We are subject to income taxes in the U.S. and Belgium. Belgium has a statutory tax rate different from the U.S. Accordingly, our effective tax rates will vary depending on the relative proportion of foreign to U.S. income, the utilization of foreign tax credits and changes in tax laws. Deferred tax assets are reduced through the establishment of a valuation allowance, if, based upon available evidence, it is determined that it is more likely than not that the deferred tax assets will not be realized.

Results of operations

Comparison of the three months ended March 31, 2022 and 2021

The following table summarizes our results of operations for the three months ended March 31, 2022 and 2021, together with the dollar change in those items:



                                         Three Months Ended        Period to
                                              March 31,              period
(in thousands)                           2022          2021          change

Revenue:

License and collaboration revenue $ 152,522 $ - $ 152,522 Total revenue

                            152,522             -        152,522

Operating expenses: Research and development expenses 21,096 11,643 9,453 General and administrative expenses 10,615 7,046 3,569 Total operating expenses

                  31,711        18,689         13,022
Income (loss) from operations            120,811       (18,689 )      139,500
Other income and expenses:
Grant income                                 491         4,915         (4,424 )
Research and development tax credits         254             -            254
Other (expense) income, net               (2,023 )         240         (2,263 )
Income (loss) before income taxes        119,533       (13,534 )      133,067
Income tax expense                       (49,951 )           -        (49,951 )
Net income (loss)                      $  69,582     $ (13,534 )   $   83,116




License revenue

License and collaboration revenue equaled $152.5 million for the three months ended March 31, 2022, resulting from a portion of the GSK upfront payment that was recognized in the first quarter of 2022.



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Research and development expenses

Research and development expenses increased by $9.5 million to $21.1 million for the three months ended March 31, 2022, from $11.6 million for the three months ended March 31, 2021. This increase was primarily related to an increase of $1.1 million of payroll and related costs, a $7.5 million increase CRO/CMO fees and internal laboratory expenses, a $0.3 million increase in stock-based compensation, an increase of $0.3 million in professional fees and an increase of $0.1 million related to facilities. In addition, there was also a $0.2 million increase related to various other reserach and development expenses. The overall increase was due to an increase in activities related to EOS-448 and inupadenant clinical trials. In addition, there was an increase in spending related to our preclinical programs during the three months ended March 31, 2022.

General and administrative expenses

General and administrative expenses increased by $3.6 million to $10.6 million for the three months ended March 31, 2022 from $7.0 million for the three months ended March 31, 2021.

The increase was primarily attributable to an increase of $1.0 million of payroll and related costs resulting from additional executives and finance and administrative employees added to support our continuous growth in operations, a $1.3 million increase in stock-based compensation, an increase of $0.8 million in professional fees, an increase of $0.2 million related to facilities and an increase of $0.1 million for directors' and officers' insurance. In addition, there was also a $0.2 million increase related to various other general and administrative expenses. The overall increase in professional fees can be primarily attributed to SEC reporting, SOX compliance, and consulting costs related to our corporate structure in Belgium.

Grant income

Grant income decreased by $4.4 million to $0.5 million for the three months ended March 31, 2022 from $4.9 million for the three months ended March 31, 2021. The overall decrease in grant income, driven by spending on qualified research and development activities, was primarily attributable to the significant preclinical activities in 2021 and certain grant programs reaching their maturity. For the three months ended March 31, 2022, grant income relating to preclinical activities decreased by $3.6 million and the grant income relating to the inupadenant program decreased by $0.9 million.

Research and development tax credits

Research and development tax credits increased by $0.3 million as no research and development tax credits were recognized as income for the three months ended March 31, 2021.

Other income (expense), net

The other income (expense), net for the three months ended March 31, 2022 primarily relates to foreign exchange losses recorded as a result of the change in euro to U.S. dollar exchange rate that occurred in the first three months of 2022.

Income tax expense

Our effective tax rates were 41.8% and 0.0% for the three months ended March 31, 2022 and 2021, respectively. The effective tax rate for the three months ended March 31, 2022 was higher than the federal and foreign statutory rates of 21% and 25%, respectively, primarily due to the mix of income between the U.S. and Belgium, the Innovation Income Deduction in Belgium, which excludes 85% of the net revenue generated from qualifying intellectual property from taxation, the taxation in the U.S. from the inclusion of foreign earnings under the Global Intangible Low-Taxed Income ("GILTI") regime, and capitalized research and development expenses under Section174 of the Internal Revenue Code. In addition, the Company recorded an additional $22.3 million liability as of March 31, 2022, related to an uncertain tax position regarding the Company's allocation of revenue between Belgium and the U.S.

Liquidity and capital resources

In June, 2021, the Company's wholly owned subsidiary, iTeos Belgium S.A., and GSK executed the GSK Collaboration Agreement, pursuant to which we agreed to grant GSK a license under certain of our intellectual property rights to develop, manufacture, and commercialize products comprised of or containing our antibody product, EOS-448. Under the GSK Collaboration Agreement, GSK made an upfront payment of $625.0 million on August 5, 2021.

To date, we have funded our operations primarily with proceeds from the IPO, the sales of preferred stock, grants and licenses and the upfront payment from the GSK Collaboration Agreement. As of March 31, 2022, we had $824.0



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million in cash and cash equivalents. To date we have not generated any revenue from product sales and do not expect to generate revenue from the sales of products for the foreseeable future.

In addition, in the event that we receive revenue from products or services related to the intellectual property developed arising from the programs, we must pay to the Walloon Region a 0.33% royalty on revenue related to the inupadenant grant and a 0.15% royalty on revenue on the EOS-448 grant (increased from 0.12% effectively December 2021). The maximum amount payable to the Walloon Region under each grant, including the fixed annual repayments, the royalty on revenue, and the interest thereon, is twice the amount of grant received. The Company recorded a royalty accrual of $0.9 million as of March 31, 2022, due to the upfront payment received pursuant to the GSK Collaboration Agreement.

Under the GSK Collaboration Agreement and as part of the Global Development Plan, the Company and GSK agree to spend an aggregate amount of at least $900 million. GSK is responsible for 60% of the cost, while the Company is responsible for the remaining 40% of the cost related to the Global Development Plan. We have not included such potential expenditures, as the timing of the obligations are not known with certainty.

We enter into contracts in the normal course of business with CROs and clinical sites for the conduct of clinical trials, professional consultants for expert advice and other vendors for clinical supply manufacturing or other services. These contracts are not included in the table above as they provide for termination on notice, and therefore are cancelable contracts and do not include any minimum purchase commitments.

Cash flows

The following table provides information regarding our cash flows for the three months ended March 31, 2022 and 2021:



                                                              Three Months Ended
                                                                   March 31,
(in thousands)                                               2022            2021
Net cash provided by (used in):
Operating activities                                      $   (24,002 )   $   (14,790 )
Investing activities                                             (323 )           (91 )
Financing activities                                              333             667
Effects of exchange rate changes on cash, cash
equivalents and
  restricted cash                                                (563 )          (717 )
Net decrease in cash, cash equivalents and restricted
cash                                                      $   (24,555 )   $   (14,931 )

Net cash used in operating activities

Net cash used in operating activities was $24.0 million during the three months ended March 31, 2022. The decrease was due to the $31.7 million in operating expenses, that was partially off-set by stock based compensation, equaling $4.2 million and various prepayments made in 2022. Net cash used in operating activities was $14.8 million during the three months ended March 31, 2021, was primarily due to our net loss of $13.5 million.

Net cash used in investing activities

Net cash used in investing activities increased by $0.2 million for the three months ended March 31, 2022 compared to the three months ended March 31, 2021. The increase in cash used in investing activities was primarily due to higher investments in laboratory and other equipment and software during the three months ended March 31, 2022.

Net cash provided by financing activities

Net cash provided by financing activities was $0.3 million and $0.7 million during the three months ended March 31, 2022 and 2021. This was due to the proceeds received from the exercise of stock options during those periods.

Effects of exchange rate changes on cash, cash equivalents and restricted cash

The $0.6 million and $0.7 million reduction of cash, cash equivalents and restricted cash for the three months ended March 31, 2022 and 2021, respectively, was primarily caused by the reduction of the euro to dollar exchange rate during those periods.



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Funding requirements

We expect our expenses to increase in connection with our ongoing activities, particularly as we continue our Phase 1/2 trials for both EOS-448 and inupadenant and move to larger randomized and registration-directed trials for both programs, advance the development of pipeline programs, initiate new research and preclinical development efforts and seek marketing approval for any product candidates that we successfully develop. In addition, if we obtain marketing approval for any of our product candidates, we expect to incur significant commercialization expenses related to establishing sales, marketing, distribution and other commercial infrastructure to commercialize such products.

In June, 2021, the Company's wholly owned subsidiary, iTeos Belgium S.A., and GSK executed the GSK Collaboration Agreement, pursuant to which we agreed to grant GSK a license under certain of our intellectual property rights to develop, manufacture, and commercialize products comprised of or containing our antibody product, EOS-448. Under the GSK Collaboration Agreement, GSK made an upfront payment of $625.0 million on August 5, 2021. Additionally, we are eligible to receive up to $1.45 billion in milestone payments, contingent upon the EOS-448 program achieving certain development and commercial milestones.

As of March 31, 2022, we had cash and cash equivalents of $824.0 million. The significant increase in cash and cash equivalents is due to the $625.0 million upfront payment from GSK received on August 5, 2021. We believe our existing cash and cash equivalents could enable us to fund our operating expenses and capital expenditure requirements into 2026.

We have based our projections of operating capital requirements on assumptions that may prove to be incorrect and we may use all of our available capital resources sooner than we expect. Because of the numerous risks and uncertainties associated with the development and commercialization of EOS-448 and inupadenant, and the research, development and commercialization of other potential product candidates, we are unable to estimate the exact amount of our operating capital requirements. Our future capital requirements will depend on many factors, including:

the scope, progress, timing, costs and results of clinical trials of product candidates;

research and preclinical development efforts for any future product candidates that we may develop;

our ability to enter into and the terms and timing of any collaborations, licensing agreements or other arrangements;

the number of future product candidates that we pursue and their development requirements;

the outcome, timing and costs of seeking regulatory approvals;

the costs of commercialization activities for any of our product candidates that receive marketing approval to the extent such costs are not the responsibility of any future collaborators, including the costs and timing of establishing product sales, marketing, distribution and manufacturing capabilities;

subject to receipt of marketing approval, revenue, if any, received from commercial sales of our current and future product candidates;

our headcount growth and associated costs as we expand our research and development and establish a commercial infrastructure;

the costs of preparing, filing and prosecuting patent applications, maintaining and protecting our intellectual property rights and defending against intellectual property related claims;

the costs of operating as a public company; and

the emergence of competing therapies and other adverse market developments.

Critical accounting policies and significant judgments and estimates

Our management's discussion and analysis of our financial condition and results of operations is based on our financial statements, which we have prepared in accordance with U.S. generally accepted accounting principles. We believe that several accounting policies are important to understanding our historical and future performance. We refer to these policies as critical because these specific areas generally require us to make judgments and estimates about matters that are uncertain at the time we make the estimate, and different estimates-which also would have been reasonable-could have been used. On an ongoing basis, we evaluate our estimates and judgments, including those described in greater detail below. We base our estimates on historical experience and other market-specific or other relevant assumptions that we believe to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.



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There have been no significant changes to our existing critical accounting policies discussed in our Annual Report on Form 10-K for the year ended December 31, 2021. We believe the following accounting policies to be most critical to the judgments and estimates used in the preparation of our financial statements:

Revenue Recognition

We generate revenue from our GSK Collaboration Agreement. We recognize revenue in accordance with ASC 606, which applies to all contracts with customers, except for contracts that are within the scope of other standards. Under ASC 606, we recognize revenue when our customer obtains control of promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that we determine are within the scope of ASC 606, we perform the following five steps:

(i)

identify the contract(s) with a customer;

(ii)

identify the performance obligations in the contract;

(iii)

determine the transaction price;

(iv)

allocate the transaction price to the performance obligations in the contract; and

(v)

recognize revenue when (or as) the entity satisfies a performance obligation.

We only apply the five-step model to contracts when it is probable that the entity will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, we assess the goods or services promised within each contract and determine those that are performance obligations, and assess whether each promised good or service is distinct. We then recognize as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) the performance obligation is satisfied. We do not include a financing component in our estimated transaction price at contract inception unless we estimate that certain performance obligations will not be satisfied within one year. Additionally, we recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that we otherwise would have recognized is one year or less.

Research and development expenses

As part of the process of preparing our financial statements, we are required to estimate our accrued research and development expenses. This process involves reviewing open contracts and purchase orders, communicating with our personnel to identify services that have been performed for us and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of the actual cost. The majority of our service providers invoice us monthly in arrears for services performed or when contractual milestones are met. We make estimates of our accrued expenses as of each balance sheet date in our financial statements based on facts and circumstances known to us at that time, which we periodically confirm with the service providers and make adjustments if necessary. Examples of accrued research and development expenses include fees paid to:

CROs in connection with clinical trials;

CMOs with respect to clinical materials, intermediates, drug substance and drug product;

vendors in connection with research and preclinical development activities; and

vendors related to manufacturing, development and distribution of clinical supplies.

We must develop assumptions that require judgment to determine whether the individual promises should be accounted for as separate performance obligations or as a combined performance obligation, and to determine the stand-alone selling price for each performance obligation identified in the contract. Since the upfront license was bundled with other promises, we utilized judgment to assess the nature of the combined performance obligation and determined that the combined performance obligation is satisfied over time. Revenue is recognized using a percent complete method based on costs incurred compared with the total expected costs to be incurred (cost to cost measure of progress). There are no outputs from the performance obligation. As a result, an input method was appropriate. A cost to cost measure of progress provides a faithful depiction of the transfer of services to the customer since the predominant inputs to the performance obligation are labor costs, research and development supplies and manufacturing supplies related to the Phase 1 Study, clinical manufacturing and know-how transfer.



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The preceding estimates and judgments materially affect our recognition of revenue. Changes in our estimates of forecasted development costs could impact percentage complete and could have a material effect on revenue recorded in the period in which we determine that change occurs.

Stock-based compensation expense

Prior to our IPO in July 2020, there had been no public market for our common stock. The estimated fair value of our common stock was determined by our board of directors as of the date of each option grant, with input from management, considering our most recently available third-party valuations of common stock, and our board of directors' assessment of additional objective and subjective factors that it believed were relevant and which may have changed from the date of the most recent valuation through the date of the grant. These third-party valuations were performed in accordance with the guidance outlined in the American Institute of Certified Public Accountants' Accounting and Valuation Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation. Our common stock valuations were prepared using either an option pricing method, or OPM, or a hybrid method, both of which used market approaches to estimate our enterprise value. In addition to considering the results of these third-party valuations, our board of directors considered both objective and subjective factors, including:

the prices at which we sold preferred stock and the superior rights and preferences of the preferred stock relative to our common stock at the time of each grant;

the progress of our research and development programs, including the status of preclinical studies and planned clinical trials for our product candidates;

our stage of development and our business strategy;

external market conditions affecting the biotechnology industry, and trends within the biotechnology industry;

our financial position, including cash and cash equivalents on hand, and our historical and forecasted performance and operating results;

the lack of an active public market for our common stock and our preferred stock; and

the likelihood of achieving a liquidity event, such as an initial public offering or a sale of our company in light of prevailing market conditions.

The assumptions underlying these valuations represented management's best estimate, which involved inherent uncertainties and the application of management judgement. As a result, if factors or expected outcomes changed and we used significantly different assumptions or estimates, our stock-based compensation could be materially different.

Following our IPO, the fair value of our common stock is determined based on the quoted market price of our common stock.

There were no significant changes to assumptions used to value options using the Black Scholes option pricing model in 2022, with the exception of the stock and exercise prices.

Government grant funding and potential repayment commitments under recoverable cash advance grants (RCAs)

We have agreements with granting agencies whereby we receive funding under grants, which partially or fully conreimburse us for eligible research and development expenditures. Certain grant agreements require us to repay the funding wherein the repayment provision of the grants are predicated on whether we decide to pursue commercial development or out licensing of the drug candidate that is produced from the results of the research program. The repayment provision includes a portion that is fixed (corresponding to 30% of the grant) which is effective after we decide to pursue commercial development or out licensing of the drug candidate. The repayment provision also includes a potential obligation to pay a royalty that is contingent upon achieving sales of a product developed through the program. The maximum amount payable to the granting agency under each grant, including the fixed repayments, the royalty on revenue, and the interest thereon, is twice the amount of funding received.

Grant funding for research and development received under grant agreements where there is a repayment provision is recognized as other income to the extent there is no potential obligation to repay this funding. We record the present value of the liability as a grant repayable in the accompanying condensed consolidated balance sheets. The grant repayable is subsequently recorded at amortized cost. There were no significant changes to assumptions in 2022.



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Income taxes

We are subject to taxes in the U.S. and Belgium. Significant judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and any valuation allowance recorded against our net deferred tax assets. We make these estimates and judgments about our future taxable income that are based on assumptions that are consistent with our future plans. Tax laws, regulations and administrative practices may be subject to change due to economic or political conditions including fundamental changes to the tax laws applicable to corporate multinationals. The U.S. and many countries in the European Union are actively considering changes in this regard. As of March 31, 2022 and December 31, 2021, we had recorded a full valuation allowance on our net deferred tax assets because we expect that it is more likely than not that our deferred tax assets will not be realized. Should the actual amounts differ from our estimates, the amount of our valuation allowance could be materially impacted.

Furthermore, significant judgment is required in evaluating our tax positions. In the ordinary course of business, there are many transactions and calculations for which the ultimate tax settlement is uncertain. As a result, we recognize the effect of this uncertainty on our tax attributes or taxes payable based on our estimates of the eventual outcome. These effects are recognized when, despite our belief that our tax return positions are supportable, we believe that it is more likely than not that some of those positions may not be fully sustained upon review by tax authorities. We are required to file income tax returns in the U.S. and Belgium, which requires us to interpret the applicable tax laws and regulations in effect in such jurisdictions. Such returns are subject to audit by the various federal, state and foreign taxing authorities, who may disagree with respect to our tax positions. We believe that our consideration is adequate for all open audit years based on our assessment of many factors, including past experience and interpretations of tax law. We review and update our estimates in light of changing facts and circumstances, such as the closing of a tax audit, the lapse of a statute of limitations or a change in estimate. To the extent that the final tax outcome of these matters differs from our expectations, such differences may impact income tax expense in the period in which such determination is made. The eventual impact on our income tax expense depends in part if we still have a valuation allowance recorded against our deferred tax assets in the period that such determination is made.

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