Definium Therapeutics, Inc. (DFTX)

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with the unaudited condensed consolidated financial statements and notes thereto included elsewhere in this Quarterly Report. This Quarterly Report, including the following sections, contains forward-looking statements. These statements are subject to risks and uncertainties that could cause actual results and events to differ materially from those expressed or implied by such forward-looking statements. For a detailed discussion of these risks and uncertainties, see Item 1A “Risk Factors” in our 2025 Annual Report and this Quarterly Report. See also “Special Note Regarding Forward-Looking Statements.” We caution the reader not to place undue reliance on these forward-looking statements, which reflect management’s analysis only as of the date of this Quarterly Report. We undertake no obligation to update forward-looking statements, which reflect events or circumstances occurring after the date of this Quarterly Report, except as required by law.

Our U.S. GAAP accounting policies are referred to in Note 2 of the Condensed Consolidated Financial Statements in this Quarterly Report as well as the Consolidated Financial Statements included in our 2025 Annual Report. All amounts are in United States dollars, unless otherwise indicated.

Overview

We are a late-stage clinical biopharmaceutical company developing a new generation of therapeutics intended to address underlying causes of psychiatric and neurological disorders. Our mission is to forge a new era of psychiatry by applying scientific rigor to psychedelics, with the goal of developing accessible treatments that unlock healing at scale. This specifically includes pharmaceutically optimized product candidates derived from the psychedelic and empathogen drug classes, including DT120 and DT402, respectively, our lead product candidates.

Our lead product candidate, DT120 (Lysergide) orally disintegrating tablet (“ODT”), is a proprietary, pharmaceutically optimized form of lysergide D-tartrate that we are developing for the treatment of adults with generalized anxiety disorder (“GAD”), major depressive disorder (“MDD”) and posttraumatic stress disorder (“PTSD”). In December 2023, we announced positive topline results from our Phase 2b clinical trial of DT120 for the treatment of GAD. The trial met its primary endpoint, with DT120 demonstrating statistically significant and clinically meaningful dose-dependent improvements on the Hamilton Anxiety Rating Scale (“HAM-A”) compared to placebo at Week 4. In March 2024, we announced that the U.S. Food and Drug Administration (“FDA”) granted breakthrough designation to our DT120 program for the treatment of GAD. We also announced in March 2024 that our Phase 2b clinical trial of DT120 in GAD met its key secondary endpoint, and 12-week topline data demonstrated clinically and statistically significant durability of activity observed through Week 12. In September 2025, we announced that the full results from our Phase 2b clinical trial of DT120 in GAD had been published in the Journal of the American Medical Association.

In June 2024, we announced the completion of our End-of-Phase 2 meeting with the FDA, supporting the advancement of DT120 ODT into pivotal trials for the treatment of adults with GAD. Our Phase 3 clinical program for DT120 ODT consists of two clinical trials: the Voyage study (DT120-300) and the Panorama study (DT120-301). Both trials are comprised of two parts: Part A, which is a 12-week, randomized, double-blind, placebo-controlled, parallel-group trial assessing the efficacy and safety of DT120 ODT versus placebo; and Part B, which is a 40-week extension period during which participants will be eligible for open-label treatment with DT120 ODT, subject to certain conditions for treatment eligibility. Both trials use an adaptive trial design with a blinded interim sample size re-estimation (“SSRE”), allowing for an increase in sample size by up to 50% in each trial or, in the case of Panorama, a decrease in sample size, depending on the observed values for certain nuisance parameters. In February 2026, we announced that the SSRE for Voyage has been completed and it was determined that no increase in the sample size of the trial was required. In April 2026, we announced that Voyage was fully enrolled with 214 participants randomized 1:1 to receive DT120 ODT 100 µg or placebo. In April 2026, we also announced that the SSRE for Panorama has been completed and it was determined that the sample size of the trial would be updated to a target of 200 participants. Panorama is fully enrolled with 245 participants randomized 2:1:2 to receive DT120 ODT 100 µg, DT120 ODT 50 µg or placebo. The primary endpoint for each trial is the change from baseline in HAM-A score at Week 12 between DT120 ODT 100 µg and placebo. We anticipate a topline readout (Part A results) for Voyage in mid-August 2026 and a topline readout (Part A results) for Panorama in September 2026.

In addition to our Phase 3 clinical program for GAD, we are developing DT120 ODT for the treatment of adults with MDD. In the first quarter of 2024, we held a pre-IND meeting with FDA to discuss the initiation of our Phase 3 clinical program for DT120 ODT in MDD and the trial design for the Emerge study (DT120-310), which like our pivotal trials in GAD, will be comprised of two parts: Part A, which is a 12-week, randomized, double-blind, placebo-controlled, parallel group trial assessing the efficacy and safety of DT120 ODT versus placebo; and Part B, which is a 40-week extension

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period during which participants will be eligible for open-label treatment with DT120 ODT, subject to certain conditions for treatment eligibility. Emerge is fully enrolled with 149 participants randomized 1:1 to receive DT120 ODT 100 µg or placebo. The primary endpoint is the change from baseline in Montgomery Åsberg Depression Rating Scale (“MADRS”) score at Week 6 between DT120 ODT 100 µg and placebo. In June 2026, we announced topline data (Part A results) for Emerge, which is described below under Recent Developments.

We activated the initial sites in our second Phase 3 clinical trial of DT120 ODT in MDD, Ascend (DT120-311), in the first quarter of 2026 and announced that the first patient was dosed in May 2026. Ascend has a similar design to Emerge, with a 12-week, randomized, double-blind, placebo-controlled, parallel group design assessing the efficacy and safety of DT120 ODT versus placebo (Part A); and Part B, which is a 40-week extension period during which participants will be eligible for open-label treatment with DT120 ODT. Ascend is anticipated to enroll approximately 165 participants (randomized 2:1:2 to receive DT120 ODT 100 µg, DT120 ODT 50 µg or placebo). The primary endpoint is the change from baseline in MADRS score at Week 6 between DT120 ODT 100 µg and placebo. We anticipate a topline readout (Part A results) for Ascend in 2027.

In April 2026, we announced the Haven study as part of our planned Phase 3 clinical program for DT120 ODT for the treatment of adults with PTSD. The Haven study is anticipated to be comprised of two parts: Part A, which is a 12-week, randomized, double-blind, placebo-controlled, parallel group trial assessing the efficacy and safety of DT120 ODT versus placebo; and Part B, which is a 40-week extension period during which participants will be eligible for open-label treatment with DT120 ODT, subject to certain conditions for treatment eligibility. Haven is anticipated to enroll approximately 200 participants randomized 1:1 to receive DT120 ODT 100 µg or placebo. The primary endpoint is anticipated to be the change from baseline in Clinician-Administered PTSD Scale for DSM-5 (CAPS-5) at Week 8 between DT120 ODT 100 µg and placebo. Haven is expected to initiate in 2027.

Our second lead product candidate, DT402, also referred to as R(-)-MDMA, is our proprietary form of the R-enantiomer of 3,4-methylenedioxymethamphetamine, which we are developing for the treatment of adults with ASD. MDMA is a synthetic molecule that is often referred to as an empathogen because it is reported to increase feelings of connectedness and compassion. Preclinical studies of R(-)-MDMA demonstrated its acute pro-social and empathogenic effects, while its diminished dopaminergic activity suggests that it has the potential to exhibit less stimulant activity, neurotoxicity, hyperthermia and abuse liability compared to racemic MDMA or the S(+)-enantiomer. In October 2024, we completed our first clinical trial of DT402, a single-ascending dose trial in adult healthy volunteers. The data from this Phase 1 clinical trial helped to characterize the tolerability, pharmacokinetics and pharmacodynamics of DT402.

We initiated a Phase 2a trial of DT402 in ASD in the fourth quarter of 2025. This study is a single-dose, open-label study to assess early signals of efficacy of DT402 in treating core socialization and communication symptoms in adults with ASD. This study is anticipated to enroll up to 20 participants. The objectives and endpoints of the study are designed to characterize the pharmacodynamics and clinical effects of DT402 in adults with ASD, including on multiple functional measures. We anticipate initial data from our Phase 2a study in 2026.

Beyond our clinical stage product candidates, we are exploring additional programs, including through external collaborations, which we seek to expand our drug development pipeline and broaden the potential applications of our lead product candidates. These research and development programs may include nonclinical, preclinical and human clinical trials of current and new product candidates and research compounds with our collaborators.

As previously disclosed, in April 2020, we entered into a License and Collaboration Agreement (the “License Agreement”) with Dr. Matthias Liechti’s lab (the “Liechti Lab”) at the University Hospital Basel (“UHB”), a leading pharmacology and clinical research group studying psychedelic substances based in Basel, Switzerland. Pursuant to the License Agreement, we acquired exclusive worldwide rights to data, compounds, and patent rights associated with the Liechti Lab’s research with lysergide and other psychedelic compounds, including data from preclinical studies and completed or ongoing clinical trials of lysergide and MDMA. In exchange, UHB was entitled to receive milestone payments and royalties on commercially marketed products developed through the collaboration, subject to certain terms and conditions. In June 2026, we terminated the License Agreement. As part of the termination, we received a non-exclusive, worldwide, fully paid-up license to the applicable data, compounds, and patent rights. In addition, there are no future milestone or royalty payments owed to UHB.

Our business is premised on a growing body of research supporting the use of novel psychoactive compounds to treat a myriad of brain health disorders. For all product candidates, we intend to proceed through research and development, and with marketing of the product candidates that may ultimately be approved pursuant to the regulations of the FDA and the regulations in other jurisdictions. This entails, among other things, conducting clinical trials with research

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scientists, using internal and external clinical drug development teams, producing and supplying product candidates according to current Good Manufacturing Practices (“cGMP”), and conducting all trials and development in accordance with the regulations of the FDA, and other regulations in other jurisdictions.

On January 9, 2026, we changed our corporate name from Mind Medicine (MindMed) Inc. to Definium Therapeutics, Inc. On January 12, 2026, we changed the name of our wholly-owned subsidiary from Mind Medicine, Inc. to Definium Therapeutics US, Inc. In conne

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with the consolidated financial statements and notes thereto included elsewhere in this Annual Report. This Annual Report, including the following section, contains forward-looking statements. These statements are subject to risks and uncertainties that could cause actual results and events to differ materially from those expressed or implied by such forward-looking statements. For a detailed discussion of these risks and uncertainties, see Item 1A “Risk Factors” in this Annual Report. See also “Special Note Regarding Forward-Looking Statements.” We caution the reader not to place undue reliance on these forward-looking statements, which reflect management’s analysis only as of the date of this Annual Report. We undertake no obligation to update forward-looking statements, which reflect events or circumstances occurring after the date of this Annual Report, except as required by law.

Our U.S. GAAP accounting policies are referred to in Note 2 of the Consolidated Financial Statements. All amounts are in United States dollars, unless otherwise indicated.

Overview

We are a late-stage clinical biopharmaceutical company developing novel product candidates to treat brain health disorders. Our mission is to forge a new era of psychiatry by applying scientific rigor to psychedelics, with the goal of developing accessible treatments that unlock healing at scale. This specifically includes pharmaceutically optimized product candidates derived from the psychedelic and empathogen drug classes including DT120 and DT402, our lead product candidates.

Our lead product candidate, DT120 ODT, is a proprietary, pharmaceutically optimized form of lysergide D-tartrate that we are developing for the treatment of adults with generalized anxiety disorder and major depressive disorder. In December 2023, we announced positive topline results from our Phase 2b clinical trial of DT120 for the treatment of GAD. The trial met its primary endpoint, with DT120 demonstrating statistically significant and clinically meaningful dose-dependent improvements on the Hamilton Anxiety Rating Scale ("HAM-A") compared to placebo at Week 4. In March 2024, we announced that the U.S. Food and Drug Administration ("FDA") granted breakthrough designation to our DT120 program for the treatment of GAD. We also announced in March 2024 that our Phase 2b clinical trial of DT120 in GAD met its key secondary endpoint, and 12-week topline data demonstrated clinically and statistically significant durability of activity observed through Week 12. In September 2025, we announced that the full results from our Phase 2b clinical trial of DT120 in GAD had been published in the Journal of the American Medical Association.

On June 20, 2024, we announced the completion of our End-of-Phase 2 meeting with the FDA, supporting the advancement of DT120 into pivotal trials for the treatment of adults with GAD. Our Phase 3 clinical program for DT120 ODT is expected to consist of two clinical trials: the Voyage study (DT120-300) and the Panorama study (DT120-301). Both trials are comprised of two parts: Part A, which is a 12-week, randomized, double-blind, placebo-controlled, parallel-group trial assessing the efficacy and safety of DT120 ODT versus placebo; and Part B, which is a 40-week extension period during which participants will be eligible for open-label treatment with DT120 ODT, subject to certain conditions for treatment eligibility. Voyage is anticipated to enroll approximately 200 participants (randomized 1:1 to receive DT120 ODT 100 µg or placebo) and Panorama is anticipated to enroll approximately 250 participants (randomized 2:1:2 to receive DT120 ODT 100 µg, DT120 ODT 50 µg or placebo). Both trials use an adaptive trial design with a blinded interim sample size re-estimation (“SSRE”), allowing for an increase in sample size by up to 50% in each trial depending on the observed values for certain nuisance parameters. The SSRE for Voyage has been completed and it was determined that no increase in the sample size of the trial is required. The primary endpoint for each trial is the change from baseline in HAM-A score at Week 12 between DT120 ODT 100 µg and placebo. In December 2024, we announced the initiation of Voyage, and we anticipate a topline readout (Part A results) in early third quarter 2026. On January 2025, we announced the initiation of Panorama, with an anticipated topline readout (Part A results) in the second half of 2026.

In addition to our Phase 3 clinical program for GAD, we are developing DT120 ODT for the treatment of adults with MDD. In the first quarter of 2024, we held a pre-IND meeting with FDA to discuss the initiation of our Phase 3 clinical program for DT120 ODT in MDD and the trial design for the Emerge study (DT120-310), which like our pivotal trials in GAD, we anticipate will be comprised of two parts: Part A, which is a 12-week, randomized, double-blind, placebo-controlled, parallel group trial assessing the efficacy and safety of DT120 ODT versus placebo; and Part B, which is a 40-week extension period during which participants will be eligible for open-label treatment with DT120 ODT, subject to certain conditions for treatment eligibility. Emerge is fully enrolled with 149 participants randomized 1:1 to receive DT120 ODT 100 µg or placebo. The primary endpoint is the change from baseline in Montgomery Åsberg Depression Rating Scale ("MADRS") score at Week 6 between DT120 ODT 100 µg and placebo. In April 2025, we announced the initiation of Emerge, and we anticipate a topline readout (Part A results) in late second quarter 2026.

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We activated initial sites in our second Phase 3 clinical trial of DT120 ODT in MDD, Ascend (DT120-311), in the first quarter of 2026 and we expect to dose our first patient in this trial by early second quarter 2026. Ascend has a similar design to Emerge, with a 12-week, randomized, double-blind, placebo-controlled, parallel group design assessing the efficacy and safety of DT120 ODT versus placebo (Part A); and Part B, which includes a 40-week extension period during which participants will be eligible for open-label treatment with DT120 ODT. Ascend is anticipated to enroll approximately 175 participants (randomized 2:1:2 to receive DT120 ODT 100 µg, DT120 ODT 50 µg or placebo). The primary endpoint is the change from baseline in MADRS score at Week 6 between DT120 ODT 100 µg and placebo.

Our second lead product candidate, DT402, also referred to as R(-)-MDMA, is our proprietary form of the R-enantiomer of 3,4-methylenedioxymethamphetamine, which we are developing for the treatment of adults with ASD. MDMA is a synthetic molecule that is often referred to as an empathogen because it is reported to increase feelings of connectedness and compassion. Preclinical studies of R(-)-MDMA demonstrated its acute pro-social and empathogenic effects, while its diminished dopaminergic activity suggests that it has the potential to exhibit less stimulant activity, neurotoxicity, hyperthermia and abuse liability compared to racemic MDMA or the S(+)-enantiomer. In October 2024, we completed our first clinical trial of DT402, a single-ascending dose trial in adult healthy volunteers. The data from this Phase 1 clinical trial helped to characterize the tolerability, pharmacokinetics and pharmacodynamics of DT402.

We initiated a Phase 2a trial of DT402 in ASD in the fourth quarter of 2025. This study is a single-dose, open-label study to assess early signals of efficacy of DT402 in treating core socialization and communication symptoms in adults with ASD. This study is anticipated to enroll up to 20 participants. The objectives and endpoints of the study are designed to characterize the pharmacodynamics and clinical effects of DT402 in adults with ASD, including on multiple functional biomarkers. We anticipate initial data from our Phase 2a study in 2026.

Beyond our clinical stage product candidates, we are exploring additional programs, including through external collaborations, which we seek to expand our drug development pipeline and broaden the potential applications of our lead product candidates. These research and development programs include non-clinical, pre-clinical and human clinical trials of current and new product candidates and research compounds with our collaborators.

Our business is premised on a growing body of research supporting the use of novel psychoactive compounds to treat a myriad of brain health disorders. For all product candidates, we intend to proceed through research and development, and with marketing of the product candidates that may ultimately be approved pursuant to the regulations of the FDA and the regulations in other jurisdictions. This entails, among other things, conducting clinical trials with research scientists, using internal and external clinical drug development teams, producing and supplying product candidates according to current Good Manufacturing Practices (“cGMP”), and conducting all trials and development in accordance with the regulations of the FDA, and other regulations in other jurisdictions.

On January 9, 2026, we changed our corporate name from Mind Medicine (MindMed) Inc. to Definium Therapeutics, Inc. On January 12, 2026, we changed the name of our wholly-owned subsidiary from Mind Medicine, Inc. to Definium Therapeutics US, Inc. In connection with our name change, we began trading on Nasdaq under the symbol “DFTX” on January 15, 2026.

We were incorporated under the laws of the Province of British Columbia in 2010. Our wholly-owned subsidiary, Definium Therapeutics US, Inc. (“Definium US”), was incorporated in Delaware in 2019. Prior to February 27, 2020, our operations were conducted through Definium US.

Since inception, we have incurred losses while advancing the research and development of our products and processes. Our net losses were $183.8 million for the year ended December 31, 2025, and $108.7 million for the year ended December 31, 2024. As of December 31, 2025, we had an accumulated deficit of $582.7 million and cash, cash equivalents and investments of $411.6 million.

Components of Operating Results

Operating Expenses

Research and Development

Research and development expenses account for a significant portion of our operating expenses. Research and development expenses consist primarily of direct and indirect costs incurred for the development of our product candidates.

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External expenses include:

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payments to third parties in connection with the clinical development of our product candidates, including licensing fees and fees to contract research organizations and consultants;

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the cost of manufacturing products for use in our preclinical studies and clinical trials, including payments to contract manufacturing organizations and consultants;

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payments to third parties in connection with the preclinical development of our product candidates, including outsourced professional scientific development services, consulting research fees and sponsored research arrangements with third parties; and

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allocated operational expenses, which include direct or allocated expenses for information technologies and human resources.

We may also incur in-process research and development expenses as we acquire or in-license assets from other parties. Technology acquisitions are expensed or capitalized based upon the asset achieving technological feasibility in accordance with management’s assessment regarding the ultimate recoverability of the amounts paid and the potential for alternative future use. Acquired in-process research and development costs that have no alternative future use are immediately expensed.

Internal expenses include employee-related costs such as salaries, related benefits and non-cash stock-based compensation expense for employees en

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