ImageneBio (IMA) Risk Analysis

On July 25, 2025, immediately prior to consummation of the Merger, Legacy Inmagene consummated the Non-OX40 Divestiture controlled by Legacy Inmagene immediately prior to the Merger. Accordingly, our business is entirely dependent on the success of IMG-007 for the treatment of AD and other potential indications. IMG-007 is currently in Phase 2 development for the treatment of moderate-to-severe AD. We may also develop IMG-007 for other immunological, autoimmune and inflammatory diseases such as AA, asthma, rheumatoid arthritis, and hidradenitis suppurativa. We cannot give any assurance that we will generate preclinical, clinical or other data for IMG-007 for the treatment of AD or other immunological, autoimmune and inflammatory diseases sufficiently supportive to receive regulatory approval, which will be required before IMG-007 can be commercialized. We may, among other things, experience difficulties with patient recruitment, enrollment and retention, quality and provision of materials and supplies necessary to manufacture sufficient quantities of drug product to meet our current or future preclinical study and clinical trial needs on a timely basis, or safety signals or pharmacodynamic, pharmacokinetic or efficacy data that does not align with our target profile for IMG-007. IMG-007 will require significant further clinical development, regulatory review and approval, substantial investment, access to sufficient commercial manufacturing capacity, and significant marketing efforts before we can generate any revenue from product sales. The success of our business, including our ability to finance our company and generate any revenue in the future, will primarily depend on the successful development, regulatory approval and commercialization of IMG-007, which may never occur. If we are unable to develop, or obtain regulatory approval for, or, if approved, successfully commercialize IMG-007, we may not be able to generate sufficient revenue to continue our business and our business would be materially harmed.

From time to time, we may publicly disclose interim, topline or preliminary data from our preclinical studies, clinical trials or planned clinical trials, which is based on a preliminary analysis of then-available data. The results and related findings and conclusions are subject to change following a more comprehensive review of the data related to the particular study or trial. We also make assumptions, estimations, calculations and conclusions as part of our analyses of data, and we may not have received or had the opportunity to fully and carefully evaluate all data. As a result, the interim, topline or preliminary results that we report may differ from future results of the same studies, or different conclusions or considerations may qualify such results, once additional data have been received and fully evaluated. Interim, topline and preliminary data also remain subject to audit and verification procedures that may result in the final data being materially different from the preliminary data we previously published. As a result, such data should be viewed with caution until the final data are available. From time to time, we may also disclose interim data from our clinical trials. Interim, topline, or preliminary data from clinical trials that we may complete are subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment continues and more patient data become available. Adverse differences between interim, topline or preliminary data and final data could significantly harm our business prospects. Further, others, including regulatory authorities, may not accept or agree with our assumptions, estimates, calculations, conclusions or analyses or may interpret or weigh the importance of data differently, which could impact the value, approvability or commercialization of IMG-007 or any future product candidate, and our company in general. In addition, the information we choose to publicly disclose regarding a particular study or clinical trial is based on what is typically extensive information, and others may not agree with what we determine is the material or otherwise appropriate information to include in our disclosure, and any information we determine not to disclose may ultimately be deemed significant with respect to future decisions, conclusions, views, activities or otherwise regarding a particular product, product candidate or our business. If the interim, topline or preliminary data that we report differ from actual results, or if others including comparable foreign regulatory authorities, disagree with the conclusions reached, our ability to obtain approval for, and commercialize, IMG-007 or any future product candidates may be harmed, which could harm our business, operating results, prospects or financial condition. Moreover, results from previous preclinical studies or clinical trials are not necessarily predictive of future clinical trial results, and interim results of a clinical trial are not necessarily indicative of final results. IMG-007 or any future product candidates may fail to show the desired safety and efficacy in clinical development despite positive results in preclinical studies of such product candidates or having successfully advanced through initial clinical trials.

The clinical trials and manufacturing of IMG-007 and any future product candidates are subject to extensive and rigorous review and regulation by numerous government authorities in the United States and in other countries where we intend to test and market IMG-007 and any future product candidates. Before obtaining regulatory approvals for the commercial sale of any of IMG-007 or any future product candidates, we must demonstrate through lengthy, complex and expensive preclinical testing and clinical trials that such product candidates are both safe and effective for use in each target indication. In particular, because IMG-007 is subject to regulation as a biological drug product, we will need to demonstrate that it is safe, pure and potent for use in its target indications. IMG-007 and each future product candidates must demonstrate an adequate risk versus benefit profile in its intended patient population and for its intended use. Clinical testing is expensive and takes many years to complete, and is subject to uncertainty. Our planned clinical trials may not be conducted as planned or completed on schedule, if at all. Delays and failures can occur at any time during the clinical trial process. Even if our future clinical trials are completed as planned, their results may not support the safety and effectiveness of IMG-007 or any future product candidates for their targeted indications or support continued clinical development of such product candidates. Our future clinical trial results may not be successful. In addition, even if our planned trials are successfully completed, the FDA or comparable foreign regulatory authorities may not interpret the results as we do, and more trials could be required before we submit IMG-007 or any future product candidates for approval. To the extent that the results of the trials are not satisfactory to the FDA or comparable foreign regulatory authorities for support of a marketing application, we may be required to expend significant resources, which may not be available to us, to conduct additional trials in support of potential approval of IMG-007 or any future product candidates. To date, we have not completed any pivotal clinical trials required for the approval of IMG-007. We may experience delays in conducting any clinical trials, and we do not know whether our clinical trials will begin on time, will need to be redesigned, will recruit and enroll patients on time or have data readouts or be completed on schedule, or at all. Events that may prevent successful or timely commencement, readouts, and completion of clinical development and preclinical studies include: - inability to generate sufficient preclinical, toxicology, or other in vivo or in vitro data to support the initiation of clinical trials;- delays in sufficiently developing, characterizing or controlling a manufacturing process suitable for advanced clinical trials, or failure to do so;- delays in reaching agreement with the FDA, or other comparable foreign regulatory authorities as to the design or implementation of our clinical trials, or failure to do so;- delays in or failure to obtain regulatory approval to commence a clinical trial;- delays in or failure to reach an agreement on acceptable terms with clinical trial sites or prospective CROs the terms of which can be subject to extensive negotiation and may vary significantly among different clinical trial sites;- delays in or failure to obtain institutional review board ("IRB") approval or positive ethics committee opinion at each site;- delays in or failure to recruit suitable patients to participate in a clinical trial;- delays in or failure to have patients complete a clinical trial or return for post-treatment follow-up;- clinical sites, CROs or other third parties deviating from trial protocol or dropping out of a trial;- failure to perform in accordance with the FDA's Good Clinical Practice ("GCP") requirements, or applicable regulatory guidelines in other countries;- delays or failure due to restrictions or other mandated requirements imposed by FDA or other regulatory bodies on the conduct of the clinical development program based on either internal or external data, such as emerging data with other molecules, either in development or approved, that target the same immunological pathway as IMG-007;- the serious, life-threatening diseases of the patients enrolled in our clinical trials, who may die or suffer adverse medical events during the course of the trials for reasons that may not be related to IMG-007 or any future product candidates;- failure in addressing patient safety concerns that arise during the course of a trial, including occurrence of adverse events associated with IMG-007 or any future product candidate that are viewed to outweigh its potential benefits;- failure to add a sufficient number of clinical trial sites; or - failure to manufacture sufficient quantities of IMG-007 or any future product candidates for use in clinical trials. We may experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to receive marketing approval or commercialize IMG-007 or any future product candidates or significantly increase the cost of such trials, including: - we may experience changes in regulatory requirements or guidance, or receive feedback from regulatory authorities that requires us to modify the design of our clinical trials;- clinical trials of IMG-007 or any future product candidates may produce negative or inconclusive results, and we may decide, or regulators may require us, to conduct additional clinical trials or abandon development programs;- the number of patients required for clinical trials of IMG-007 or any future product candidates may be larger than we anticipate, enrollment in these clinical trials may be slower than we anticipate or participants may drop out of these clinical trials at a higher rate than we anticipate;- the ability to monitor patients adequately during or after treatment;- our third-party contractors may fail to comply with regulatory requirements or meet their contractual obligations to us in a timely manner, or at all;- we or our investigators might have to suspend or terminate clinical trials of IMG-007 or any future product candidates for various reasons, including non-compliance with regulatory requirements, a finding that IMG-007 or any future product candidates have undesirable side effects or other unexpected characteristics, a finding that the participants are being exposed to unacceptable health risks;- adverse events suffered by clinical trial participants that may ultimately be determined to be unrelated to IMG-007 or any future product candidates;- the cost of clinical trials of IMG-007 or any future product candidates may be greater than we anticipate and we may elect not to cover the costs;- the supply or quality of IMG-007 or any future product candidates or other materials necessary to conduct clinical trials of IMG-007 or any future product candidates may be insufficient or inadequate;- regulators may revise the requirements for approving IMG-007 or any future product candidates, or such requirements may not be as we anticipate; and - any future collaborators that conduct clinical trials may face any of the above issues, and may conduct clinical trials in ways they view as advantageous to them but that are suboptimal for us. If we are required to conduct additional clinical trials or other testing of IMG-007 or any future product candidates beyond those that we currently contemplate, if we are unable to successfully complete clinical trials of IMG-007 or any future product candidates or other testing, if the results of these trials or tests are not positive or are only modestly positive or if there are safety concerns, we may: - incur unplanned costs;- be delayed in obtaining marketing approval for IMG-007 or any future product candidates or not obtain marketing approval at all;- obtain marketing approval in some countries and not in others;- obtain marketing approval for indications or patient populations that are not as broad as intended or desired;- obtain marketing approval with labeling that includes significant use or distribution restrictions or safety warnings, including boxed warnings;- be subject to additional post-marketing testing requirements; or - have the product removed from the market after obtaining marketing approval. We could encounter delays if a clinical trial is suspended or terminated by us, by the IRBs or ethics committees of the institutions in which such trials are being conducted, by the Data Safety Monitoring Board ("DSMB") for such trial or by the FDA or comparable foreign regulatory authorities. These authorities may impose such a suspension or termination due to a number of factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or comparable foreign regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a drug, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial. IMG-007 will require extensive clinical testing before we are prepared to submit a biologics license application ("BLA") or marketing authorization application ("MAA") for regulatory approval. We cannot predict with any certainty if or when we might complete the clinical development for IMG-007 or any future product candidates and submit a BLA or MAA for regulatory approval of IMG-007 or any future product candidates or whether any such BLA or MAA will be approved. We may also seek feedback from the FDA, or other comparable foreign regulatory authorities on our clinical development program, and the FDA or such other comparable foreign regulatory authorities may not provide such feedback on a timely basis, or such feedback may not be favorable, which could further delay our development of IMG-007 or any future product candidates. We also cannot predict with any certainty whether or when we might complete a given clinical trial. If we experience delays in the commencement or completion of our clinical trials, or if we terminate a clinical trial prior to completion, the commercial prospects of IMG-007 or any future product candidates could be harmed, and our ability to generate revenue from IMG-007 or any future product candidates may be delayed. In addition, any delays in our clinical trials could increase our costs, slow down the development and approval process and jeopardize our ability to commence product sales and generate revenue. Any of these occurrences may harm our business, financial condition and results of operations. In addition, many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval of IMG-007 or any future product candidates.

Manipulation of the immune system via therapeutic agents can result in a spectrum of immunosuppression depending on the target and the disease being treated. In general terms immunosuppression has been associated with increased risk of infection and, with long term immunosuppression, malignancies. The risk of these types of events is dependent both on the breadth of immunosuppression as well as the disease and population in which it is being used. As with all protein-based therapies administered either intravenously or subcutaneously there is also the risk of injection site reactions and systemic hypersensitivity reactions, with cases of anaphylaxis reported with some such agents. The incidence and severity of these reactions vary depending on the characteristics of both the therapeutic agent, its target, and the vehicle solution in which the therapy is administered. When considering other therapies that target the OX40-OX40L pathway, infections including serious infections, injection site reactions, chills and pyrexia, hypersensitivity reactions, oral and gastrointestinal ulceration, and malignancies including Kaposi Sarcoma have been reported. To date, a causal association between the therapies targeting the pathway and the events has not been established. There may be undesirable side effects and adverse events associated with IMG-007 or any future product candidates. Undesirable side effects or adverse events that may be caused by IMG-007 or any future product candidates could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label than anticipated or the delay or denial of regulatory approval by the FDA or comparable foreign regulatory authorities. Results of our clinical trials could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics. While the data reported to date from our Phase 1 and Phase 2a clinical trials indicate that IMG-007 was generally well tolerated, there remains a risk that clinical trial results could reveal high and unacceptable severity and prevalence of previously unreported side effects or unexpected characteristics. Any such findings could cause delays in completion or cancellation of our clinical trials or require us to abandon or limit our development of IMG-007. If unacceptable treatment-related side effects or deaths arise in the development of IMG-007 or any future product candidates, we, the FDA, the IRBs or ethics committees at the institutions in which our studies are conducted, DSMB or comparable foreign regulatory authorities could suspend or terminate our clinical trials or the FDA or comparable foreign regulatory authorities could order us to cease clinical trials or deny approval of IMG-007 or any future product candidates for any or all targeted indications. Further undesirable side effects, dose-limiting toxicity events, or deaths in clinical trials with IMG-007 or any future product candidates may cause the FDA or comparable foreign regulatory authorities to place a clinical hold on the associated clinical trials, to require additional studies, dose de-escalation, or additional protocol amendments, or otherwise to delay or deny approval of IMG-007 or any future product candidates for any or all targeted indications. Treatment-related side effects could also affect site initiation, patient recruitment or the ability of enrolled patients to complete the trial or result in potential product liability claims. Any of these occurrences may harm our business, financial condition and prospects significantly.

The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the trial until its conclusion. We may not be able to initiate or continue clinical trials for IMG-007 or any future product candidates if we are unable to locate and enroll a sufficient number of eligible patients to participate in these trials to such trials' conclusion as required by the FDA or other comparable foreign regulatory authorities. We may experience difficulty in patient enrollment in our clinical trials for a number of reasons. The enrollment of patients depends on many factors, including: - the patient eligibility criteria defined in the protocol;- the size and nature of the patient population required for analysis of the trial's endpoints;- the proximity of patients to study sites;- the design of the trial;- our ability to recruit clinical trial investigators with appropriate competencies and experience;- clinicians' and patients' perceptions as to the potential advantages of the product candidate being studied in relation to other available therapies, including new products that may be approved for the indications we are investigating;- our ability to obtain and maintain patient consents for participation in our clinical trials; and - the risk that patients enrolled in clinical trials will not remain in the trial through the completion of evaluation. Competing with numerous ongoing trials and established therapies poses a challenge in recruiting patients. Our clinical trials may also compete with other clinical trials of product candidates that are targeting the same indications as IMG-007 or any future product candidates, and this competition could reduce the number and types of patients available to us, because some patients who might have opted to enroll in our trials may instead opt to enroll in a trial being conducted by one of our competitors. Additionally, the number of qualified clinical investigators is limited, so we may conduct some of our clinical trials at the same clinical trial sites that some of our competitors use, which will reduce the number of patients who are available for our clinical trials at such clinical trial site. Recent announcements of clinical trial plans by various companies targeting immunological, autoimmune and inflammatory diseases could intensify future competition for investigators and patients. Failure to enroll a sufficient number of patients promptly could lead to delays or failure in completing our trials, hindering the development and commercialization of IMG-007 or any future product candidates within certain patient subgroups or altogether.

Our business depends upon our ability to identify, develop and commercialize product candidates. A key element of our strategy is to develop IMG-007 for the treatment of AD and other potential indications targeting immunological, autoimmune and inflammatory diseases. We are seeking to do so through our internal research and development capabilities and may also explore additional strategic collaborations for the discovery of new product candidates. Research programs to identify product candidates require substantial technical, financial and human resources, whether or not any product candidates are ultimately identified. In addition, targets for different immunological, autoimmune and inflammatory diseases may require changes to the manufacturing processes of our CMOs or require us to identify new CMOs to manufacture our product candidates, which may slow down development of or make it impossible to manufacture our product candidates. Our research programs may initially show promise in identifying potential product candidates, yet fail to yield product candidates for clinical development for many reasons, including the following: - the research methodology or technology platform used may not be successful in identifying potential product candidates;- competitors may develop alternatives that render our product candidates obsolete or less attractive;- choosing to cease development if we determine that clinical results do not show promise;- product candidates we develop may nevertheless be covered by third parties' patents or other exclusive rights;- a product candidate may be shown to have harmful side effects or other characteristics that indicate it is unlikely to be effective or otherwise does not meet applicable regulatory criteria; and - a product candidate may not be accepted as safe and effective by patients, the medical community or third-party payors. Because we have limited resources, we must choose to pursue and fund the development of specific types of treatment, or treatment for a specific type of immunological, autoimmune and inflammatory disease, and we may forego or delay pursuit of opportunities with certain product candidates or for indications that later prove to have greater commercial potential. Our estimates regarding the potential market for IMG-007 or any future product candidates could be inaccurate, and if we do not accurately evaluate the commercial potential for a particular product candidate, we may relinquish valuable rights to that product candidate through strategic collaboration, licensing or other arrangements in cases in which it would have been more advantageous for us to retain sole development and commercialization rights to such product candidate. Alternatively, we may allocate internal resources to a product candidate in a therapeutic area in which it would have been more advantageous to enter into a partnering arrangement. If any of these events occur, we may be forced to abandon or delay our development efforts with respect to a particular product candidate or indication or fail to develop a potentially successful product candidate.