Forward Looking Statements

This Quarterly Report on Form 10-Q contains certain "forward-looking" statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 (the "Exchange Act"). You can identify these forward-looking statements by the fact they use words such as "could," "expect," "anticipate," "estimate," "target," "may," "project," "guidance," "intend," "plan," "believe," "will," "potential," "opportunity," "future" and other words and terms of similar meaning and expression in connection with any discussion of future operating or financial performance. Certain forward-looking statements can be identified by the fact that they do not relate strictly to historical or current facts. Such forward-looking statements are based on current expectations and involve inherent risks and uncertainties, including factors that could delay, divert or change any of them, and could cause actual outcomes to differ materially from current expectations. These statements relate to, among other things, our business strategy, our research and development, our product development efforts, our ability to commercialize our product candidates, our prospects for initiating partnerships or collaborations, the timing of the introduction of products, the effect of new accounting pronouncements, uncertainty regarding our future operating results and our profitability, anticipated sources of funds as well as our plans, objectives, expectations, and intentions.

We have included more detailed descriptions of these risks and uncertainties and other risks and uncertainties applicable to our business that we believe could cause actual results to differ materially from any forward-looking statements in Part II-Item 1A "Risk Factors" of this Quarterly Report on Form 10-Q. We encourage you to read those descriptions carefully. Although we believe we have been prudent in our plans and assumptions, no assurance can be given that any goal or plan set forth in forward-looking statements can be achieved. We caution investors not to place significant reliance on forward-looking statements contained in this document; such statements need to be evaluated in light of all the information contained in this document. Furthermore, the statements speak only as of the date of this document, and we undertake no obligation to update or revise these statements.

Overview

We are a clinical stage biopharmaceutical company pioneering the discovery, development and commercialization of allogeneic, off-the-shelf, invariant natural killer T (iNKT) cell therapies to treat cancer and other immune-mediated diseases. iNKT cells are a distinct T cell population that combine durable memory responses with the rapid cytolytic features of natural killer (NK) cells. iNKT cells offer distinct therapeutic advantages as a platform for allogeneic therapy in that the cells naturally home to tissues, aid clearance of tumors and infected cells and suppress graft-versus-host-disease (GvHD). Our proprietary platform is designed to facilitate scalable and reproducible manufacturing for off-the-shelf delivery. As such, we believe that our approach represents a highly versatile application for therapeutic development in cancer and immune diseases. We have leveraged our platform and manufacturing capabilities to develop a wholly owned or exclusively licensed pipeline for both native and engineered iNKT cells and have multiple preclinical and clinical readouts expected in 2021 and 2022.

Our business activities include product research and development, manufacturing, regulatory and clinical development, corporate finance and support of our collaborations. To be successful, our product candidates require clinical trials and approvals from regulatory agencies, as well as acceptance in the marketplace. We are a party to an Intercompany General & Administrative Services Agreement and an Intellectual Property Assignment and License Agreement with Agenus. Under the Intercompany General & Administrative Services Agreement, Agenus provides us with administrative support, including, without limitation, financial, legal, information technology and human resources administrative support. Additional non-administrative services and use of certain facilities are available as may be agreed to between the parties from time to time. Under the Intellectual Property Assignment and License Agreement, Agenus exclusively assigned patent rights and know-how related to our technology to us. We also have a field-limited exclusive license under certain Agenus patents and know-how; and we retain the rights to expand a proprietary pipeline of products and technologies.

Our most advanced product candidate, AGENT-797, is an off-the-shelf, allogeneic, native iNKT cell therapy. We have commenced a Phase 1 clinical trial of AGENT-797 for the treatment of multiple myeloma and expect to report top-line data from this trial in the fourth quarter of 2021. In addition, in August 2021, we received FDA clearance to initiate a Phase 1 a clinical trial for the treatment of solid tumors, which we intend to advance as our lead indication for AGENT-797 as a monotherapy and in combination with checkpoint inhibitors. We currently expect to have preliminary readouts from this clinical trial in the first half of 2022 in indications that may lead to an accelerated path to marketing approval. We also intend to initiate a Phase 1 clinical trial of AGENT-797 in GvHD in the fourth quarter of 2021, and we currently expect to report top-line data from this trial in the second half of 2022. Finally, with the unique circumstances of the COVID-19 pandemic, we were able to employ this variant-agnostic therapy for patients with ARDS secondary to COVID-19 and recently published top-line data from this Phase 1 clinical trial in the fourth quarter of 2021, reporting a 77% Survival Rate in older, mechanically ventilated patients with COVID-19 respiratory failure. We are expanding the clinical trial to include patients with viral ARDS (secondary to COVID-19 and influenza) and expect to report expanded clinical trial data in the second half of 2022.



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In addition, we are advancing a pipeline of next-generation allogeneic, engineered iNKT programs. Our two most advanced engineered programs are (1) a CAR-iNKT program targeting B-cell maturation antigen (BCMA), which we refer to as BCMA-CAR-iNKT, and (2) a tumor stromal targeting CAR-iNKT program, which we refer to as stromal target-CAR-iNKT. These programs are both in preclinical development and we expect to initiate our investigational new drug (IND) filings for these candidates in 2022.

Our research and development expenses for the nine months ended September 30, 2021 and 2020 were $10.0 million and $8.7 million, respectively. We have incurred losses since our inception. As of September 30, 2021, we had an accumulated deficit of $77.2 million.

Until the completion of our initial public offering, we were reliant on Agenus to finance our operations. We expect to continue to incur operating losses and negative cash flows for the foreseeable future. Based on our current plans and projections, we believe our quarter end cash balance, plus the proceeds received subsequently from our initial public offering, will be sufficient to satisfy our liquidity requirements for more than one year from when these financial statements were issued. Management continues to address our liquidity position and will adjust spending as needed in order to preserve liquidity. Our future liquidity needs will be determined primarily by the success of our operations with respect to the progress of our product candidates and key development and regulatory events in the future. Potential sources of additional funding include: (1) pursuing collaboration, out-licensing and/or partnering opportunities for our portfolio programs and product candidates with one or more third parties, (2) selling assets, (3) securing additional debt financing and/or (4) selling equity securities.

Historical Results of Operations

Three Months Ended September 30, 2021 Compared to the Three Months Ended September 30, 2020

Research and development expense

Research and development (R&D) expense includes compensation and other direct costs plus an allocation of indirect costs, based on certain assumptions. R&D expense increased 33% to $3.3 million for the three months ended September 30, 2021 from $2.5 million for the three months ended September 30, 2020. This increase is primarily due to the increased costs associated with an increase in preclinical activities, the initiation of our clinical trials late in 2020, increased personnel costs and increased costs associated with the allocation of Agenus services, partially offset by reduced activity of our UK subsidiary.

General and administrative expense

General and administrative (G&A) expense consists primarily of personnel costs, facility expenses, and professional fees. G&A expense increased 75% to $0.8 million for the three months ended September 30, 2021 from $0.5 million for the three months ended September 30, 2020. This increase results primarily from increased stock-based compensation expense and increased costs associated with the allocation of Agenus services.

Change in fair value of convertible affiliated note

Change in fair value of convertible affiliated note reflects the result of our fair value measurement of our note at the balance sheet date.

Interest expense

Interest expense relates to our outstanding convertible affiliated note and increased 38%, to $0.9 million for the three months ended September 30, 2021 from $0.6 million for the three months ended September 30, 2020, due to the increased principal amount outstanding period over period.

Nine Months Ended September 30, 2021 Compared to the Nine Months Ended September 30, 2020

Research and development expense

R&D expense includes compensation and other direct costs plus an allocation of indirect costs, based on certain assumptions. R&D expense increased 15% to $10.0 million for the nine months ended September 30, 2021 from $8.7 million for the nine months ended September 30, 2020. This increase is primarily due to the increased costs associated with an increase in preclinical activities, the initiation of our clinical trials late in 2020 and increased costs associated with the allocation of Agenus services, partially offset by reduced payroll costs and the reduced activity of our UK and Belgium subsidiaries.



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General and administrative expense

G&A expense consists primarily of personnel costs, facility expenses, and professional fees. G&A expense increased 43% to $2.3 million for the nine months ended September 30, 2021 from $1.6 million for the nine months ended September 30, 2020. This increase results primarily from increased stock-based compensation expense and increased costs associated with the allocation of Agenus services, partially offset by the reduced activity of our Belgium subsidiary.

Change in fair value of convertible affiliated note

Change in fair value of convertible affiliated note reflects the result of our fair value measurement of our note at the balance sheet date.

Interest expense

Interest expense relates to our outstanding convertible affiliated note and increased 39%, to $2.4 million for the nine months ended September 30, 2021 from $1.8 million for the nine months ended September 30, 2020, due to the increased principal amount outstanding period over period.

Research and Development Programs

R&D program costs include compensation and other direct costs plus an allocation of indirect costs, based on certain assumptions.



                               For the nine months
                               ended September 30,          For the years ended December 31,
                                      2021                    2020                    2019
Payroll and personnel costs    $         2,197,598      $       3,007,044       $       4,823,197
Professional fees                        4,914,634              5,025,282              12,051,677
Allocated services                       1,034,298                758,549                 430,038
Other                                    1,869,919                718,180               2,349,223
Total                          $        10,016,449      $       9,509,055       $      19,654,135

Our product candidates are in various stages of development and significant additional expenditures will be required if we start new clinical trials, encounter delays in our programs, apply for regulatory approvals, continue development of our technologies, expand our operations and/or bring our product candidates to market. The total cost of any particular clinical trial is dependent on a number of factors such as trial design, length of the trial, number of clinical sites, number of patients and trial sponsorship. The process of obtaining and maintaining regulatory approvals for new products is lengthy, expensive and uncertain. Because of the current stage of our product candidates, among other factors, we are unable to reliably estimate the cost of completing our research and development programs or the timing for bringing such programs to various markets or substantial partnering or out-licensing arrangements, and, therefore, when, if ever, material cash inflows are likely to commence.

Liquidity and Capital Resources

We have incurred annual operating losses since inception, and we had an accumulated deficit of $77.2 million as of September 30, 2021. We expect to incur losses over the next several years as we continue development of our technologies and product candidates, manage our regulatory processes, initiate and continue clinical trials, and prepare for potential commercialization of products. Through September 30, 2021, we had been reliant on Agenus to finance our operations. From our inception through September 30, 2021, we received funding of $45.5 million from Agenus.

As of September 30, 2021, we had a convertible affiliated note (the Note) outstanding of $45.5 million in principal plus accrued and unpaid interest of $6.8 million. In October 2021, in connection of the completion of our initial public offering, the Note was automatically converted into 5,451,958 shares of our common stock.

In December 2018, we entered into an agreement with the Belgium Walloon Region Government (the Walloon Region) in which the Walloon Region agreed to provide a grant of €1.3 million and a repayable advance of €8.3 million for the development of one of our research programs. As of September 30, 2021, we received $881,000 of the grant portion and $5.4 million of the repayable advance. During 2020, we discontinued research efforts related to this program and are evaluating our options in accordance with the terms of the agreement. We recognized the grant portion received as income during the years ended December 31, 2019 and 2020 and



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have included the repayable advance balance of $5.4 million in other current liabilities in our condensed consolidated balance sheet at September 30, 2021, while we finalize the termination of the agreement with the Walloon Region. We received a notice from the Walloon Region in February 2021 informing us that, pursuant to the terms of the agreement, they have assumed we plan to exploit the results of our research under the program and as such expect us to reimburse the repayable advance, and we have responded to the Walloon Region that we do not plan to exploit the results of such research. It is uncertain at this time if we will be obligated to repay any or all of this advance.

Our cash balance as of September 30, 2021 was $0.8 million. Based on our current plans and projections, we believe this cash balance, plus the net proceeds of $42.8 million received subsequently from our initial public offering, will be sufficient to satisfy our liquidity requirements for more than one year from when these financial statements were issued.

Management continues to address our liquidity position and will adjust spending as needed in order to preserve liquidity. Our future liquidity needs will be determined primarily by the success of our operations with respect to the progression of our product candidates and key development and regulatory events in the future. Potential sources of additional funding include: (1) pursuing collaboration, out-licensing and/or partnering opportunities for our portfolio programs and product candidates with one or more third parties, (2) selling assets, (3) securing additional debt financing and/or (4) selling equity securities.

Net cash used in operating activities for the nine months ended September 30, 2021 was $11.1 million. Our future ability to generate cash from operations will depend on achieving regulatory approval and market acceptance of our product candidates, and our ability to enter into collaborations. See "Management's Discussion and Analysis of Financial Condition and Results of Operations-Forward Looking Statements" in Part I, Item 2, and the risks highlighted under Part II, Item 1A. "Risk Factors", of this Quarterly Report on Form 10-Q.

Critical Accounting Policies and Estimates

The SEC defines "critical accounting policies" as those that require the application of management's most difficult, subjective, or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain and may change in subsequent periods.

The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (U.S. GAAP) requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. We base those estimates on historical experience and on various assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.

The following is not intended to represent all of our accounting policies. Our significant accounting policies are described in Note 2 of the notes to our audited consolidated financial statements included in our Amended Registration Statement on Form S-1 filed with the Securities and Exchange Commission (SEC) on October 12, 2021. In many cases, the accounting treatment of a particular transaction is dictated by U.S. GAAP, with no need for our judgment in its application. There are also areas in which our judgment in selecting an available alternative would not produce a materially different result. We have identified the following as our critical accounting policy.

Fair Value Measurements

In accordance with the Fair Value Option subsection of Accounting Standards Codification (ASC) 825, Financial Instruments - Overall, we measure the Note at fair value. In accordance with ASC 820, Fair Value Measurements and Disclosures, we measure fair value based on a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. We measured the Note using a scenario based present value methodology which was derived by evaluating the nature and terms of each note and considering the prevailing economic and market conditions at the balance sheet date.

Recent Accounting Pronouncements

Refer to Note 12 to our unaudited interim condensed consolidated financial statements included within this Quarterly Report on Form 10-Q for a description of recent accounting pronouncements applicable to our business.



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JOBS Act

We qualify as an "emerging growth company" as defined in the JOBS Act. As an emerging growth company, we may take advantage of specified reduced disclosure and other requirements that are otherwise applicable generally to public companies, including reduced disclosure about our executive compensation arrangements, exemption from the requirements to hold non-binding advisory votes on executive compensation and golden parachute payments and exemption from the auditor attestation requirement in the assessment of our internal control over financial reporting.

We may take advantage of these exemptions until the last day of the fiscal year following the fifth anniversary of our initial public offering or such earlier time that we are no longer an emerging growth company. We would cease to be an emerging growth company earlier if we have more than $1.07 billion in annual revenue, we have more than $700.0 million in market value of our stock held by non-affiliates (and we have been a public company for at least 12 months and have filed one annual report on Form 10-K) or we issue more than $1.0 billion of non-convertible debt securities over a three-year period. For so long as we remain an emerging growth company, we are permitted, and intend, to rely on exemptions from certain disclosure requirements that are applicable to other public companies that are not emerging growth companies. We may choose to take advantage of some, but not all, of the available exemptions.

In addition, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This allows an emerging growth company to delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have elected not to "opt out" of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, we will adopt the new or revised standard at the time private companies adopt the new or revised standard and will do so until such time that we either (i) irrevocably elect to "opt out" of such extended transition period or (ii) no longer qualify as an emerging growth company. Therefore, the reported results of operations contained in our consolidated financial statements may not be directly comparable to those of other public companies.





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