Form 8-K

8-K — Definium Therapeutics, Inc.

Accession: 0001104659-26-107275

Filed: 2026-09-14

Period: 2026-09-14

CIK: 0001813814

SIC: 2833 (MEDICINAL CHEMICALS & BOTANICAL PRODUCTS)

Item: Regulation FD Disclosure

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — tm2625365d1_8k.htm (Primary)

EX-99.1 — EXHIBIT 99.1 (tm2625365d1_ex99-1.htm)

EX-99.2 — EXHIBIT 99.2 (tm2625365d1_ex99-2.htm)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 14, 2026

Definium Therapeutics, Inc.

(Exact name of Registrant as Specified in Its

Charter)

British Columbia

001-40360

98-1582438

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

One World Trade Center

Suite 8500

New York, New York

10007

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: (212) 220-6633

(Former Name or Former Address, if Changed Since

Last Report)

Check the appropriate box below if the Form 8-K filing is intended

to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨Written

communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨Soliciting

material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of

the Act:

Title

of each class

Trading

Symbol(s)

Name

of each exchange on which registered

Common Shares

DFTX

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth

company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities

Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company x

If

an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying

with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 7.01 Regulation FD Disclosure.

On September 14, 2026, Definium Therapeutics, Inc. (the “Company”)

issued a press release (the “Press Release”) announcing positive topline data from the Company’s Phase 3 Panorama study

of DT120 ODT for the treatment of generalized anxiety disorder. A copy of the Press Release is attached as Exhibit 99.1 hereto, and is

incorporated by reference into this Item 7.01.

The information furnished pursuant to this Item 7.01, including Exhibit

99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the

“Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed to be incorporated by reference

into any of the Company’s filings with the SEC under the Exchange Act or the Securities Act of 1933, as amended, whether made before

or after the date hereof, regardless of any general incorporation language in such a filing, except as expressly set forth by specific

reference in such a filing.

Item 8.01 Other Events.

On September 14, 2026, the Company posted a presentation discussing

the Panorama topline data (the “Presentation”) to its website. A copy of the Presentation is attached as Exhibit 99.2 hereto,

and is incorporated by reference into this Item 8.01.

Item 9.01 Financial Statements and Exhibits.

Exhibit No.

Description

99.1

Press Release, dated September 14, 2026

99.2

Panorama Topline Data Presentation, dated September 14, 2026

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934,

the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

DEFINIUM THERAPEUTICS, INC.

Date:

September 14, 2026

By:

/s/

Robert Barrow

Name: Robert Barrow

Title:   Chief Executive Officer

EX-99.1 — EXHIBIT 99.1

EX-99.1

Filename: tm2625365d1_ex99-1.htm · Sequence: 2

Exhibit 99.1

Definium

Therapeutics Announces Positive Topline Results from Phase 3

Panorama

Study of DT120 ODT in Generalized Anxiety Disorder

Study met primary

and all key secondary efficacy endpoints; Panorama is the second positive Phase 3 trial for DT120 ODT in GAD and the third positive Phase

3 trial for DT120 ODT

Participants

receiving DT120 ODT 100 µg achieved

a statistically significant reduction in Hamilton Anxiety Rating Scale (HAM-A) score, with a placebo-adjusted change of 5.1 points from

baseline at Week 12 (p<0.0001, Cohen’s d=0.64)

DT120

ODT 100 µg was generally well

tolerated, with a safety profile consistent with prior clinical experience

Pre-NDA meeting

scheduled in 4Q 2026; NDA filing anticipated in 1H 2027

Company to host

webcast today at 8 am EDT

NEW YORK, September 14, 2026 --

Definium Therapeutics, Inc. (Nasdaq: DFTX) (“Definium” or the “Company”), a late-stage clinical biopharmaceutical

company developing a new generation of therapeutics intended to address underlying causes of psychiatric and neurological disorders,

today announced positive topline results from Panorama, the Company’s second Phase 3 study of DT120 (lysergide) Orally Disintegrating

Tablet (ODT) in adults with generalized anxiety disorder (GAD). This is the Company’s third positive Phase 3 readout for DT120

ODT, following the positive Emerge results in major depressive disorder (MDD) announced in June and the positive Voyage results

in GAD announced in August.

Panorama met its primary endpoint, demonstrating

a statistically significant and clinically meaningful improvement from baseline compared with placebo, as measured by the change in Hamilton

Anxiety Rating Scale (HAM-A) total score at Week 12. The Least Squares (LS) mean change from baseline in HAM-A total score at Week 12

in participants who received DT120 ODT 100 µg was -9.8 compared with -4.7 for participants who received placebo, an LS mean difference

of -5.1 points (p<0.0001), corresponding to a standardized effect size of d=0.64. Efficacy was rapid, with changes seen as

early as Day 2 and sustained at all post-baseline timepoints in Part A.

“The Panorama results again met

our high expectations and confirmed the unprecedented efficacy of DT120 in GAD,” said Rob Barrow, Chief Executive Officer of Definium

Therapeutics. “With strong positive results across four complementary studies, we have built a compelling body of evidence that

increases our confidence in the potential best-in-class profile of DT120. Building on this momentum, we are advancing toward an NDA submission

and look forward to aligning with the FDA at our upcoming pre-NDA meeting. We are deeply grateful to the participants, investigators,

site personnel, and our team whose commitment and hard work made this progress possible.”

Participants were monitored for a minimum

of 8 hours on dosing day and were assessed hourly beginning 5 hours after dosing on a structured end-of-session checklist (EoSC). The

average time to meet EoSC criteria was 6.2 hours for participants receiving DT120 ODT 100 μg, with a median of 6.0 hours and 94% of

participants meeting EoSC criteria by hour 8. Across over 1,000 treatment sessions in the Phase 3 program through September 10,

2026, 97% of participants met EoSC criteria by hour 8.

Definium Therapeutics Announces Positive Topline Results from Phase 3 Panorama Study of DT120 ODT in Generalized Anxiety Disorder

1

"Patients with generalized anxiety

disorder often work through two or three medications before finding one they can tolerate, and even then, daily dosing brings its own

burden, sedation, weight change, sexual side effects, and for some classes of medications, real dependence risk," said Scott Aaronson,

MD, Chief Science Officer, Institute for Advanced Diagnostics and Therapeutics at Sheppard Pratt, and a Panorama investigator. "What

stands out about DT120 ODT is that a single dose has the potential to hold a response for months without the patient managing a pill

every day. For a condition this chronic and this undertreated, a treatment that removes daily adherence with a novel mechanism of action

and a unique effect on cognitive processes underlying anxiety could change how we think about long-term management, not just acute relief."

Highlights from Panorama Topline

Results

The mean baseline HAM-A score at study

entry was 28.3 in the DT120 ODT 100 µg treatment group (n=96) and 28.0 in the placebo group (n=97).

Primary

Endpoint

DT120

ODT 100 µg

Placebo

ODT

Placebo-Adjusted

Difference

HAM-A:

LS mean change at Week 12

-9.8

-4.7

-5.1

(p<0.0001)

Key

Secondary Endpoints

CGI-S:

LS mean change at Week 12

-1.0

-0.5

-0.6

(p<0.0001)

HAM-A:

LS mean change at Week 1

-9.8

-4.5

-5.3

(p<0.0001)

CGI-S:

LS mean change at Day 2

-1.1

-0.3

-0.8

(p<0.0001)

Other

Secondary Endpoints

HAM-A:

response rate (≥50%) at Week 12

32%

14%

18%

(p<0.05)

HAM-A:

remission rate (≤7) at Week 12

15%

4%

12%

(p<0.05)

HAM-A:

mild or better (<16) at Week 12

35%

17%

19%

(p<0.01)

HAM-A = Hamilton

Anxiety Rating Scale; CGI-S = Clinical Global Impression-Severity Scale; LS = least squares; LS mean difference = difference in LS means

of change from baseline between DT120 and placebo groups; Calculated differences may not equal the arithmetic differences between displayed

values due to rounding.

Panorama included a DT120 ODT 50 µg

control arm (n=52) that was not designed or powered for statistical comparisons. Consistent with the dose-response profile demonstrated

in our Phase 2b trial, DT120 ODT 50 µg demonstrated a placebo-adjusted change of -3.5 and -3.6 at Weeks 4 and 12, approximately

50% and 29% lower than was observed for DT120 ODT 100 µg.

DT120 ODT 100 μg was generally well

tolerated, with most treatment-emergent adverse events (TEAEs) mild to moderate in severity, transient, and predominantly occurring on

the day of dosing. No new safety signals were identified, including no suicidality signal or suicidal behavior. There were no drug-related

serious adverse events. Overall discontinuation rates were similar between DT120 ODT 100 μg, DT120 50 μg, and placebo groups (10.4%,

11.5%, and 10.3%). The overall TEAE rate for DT120 ODT 100 μg, DT120 50 μg, and placebo was 94.8%, 96.1%, and 62.9%. The most common

TEAEs (>10%) in the DT120 ODT 100 μg and 50 μg arms on dosing day were illusion (68%, 61%), nausea (37%, 26%), and headache

(24%, 28%). Adverse events were collected in accordance with the FDA Guidance for Psychedelic Drug Development, which includes expected

effects of the drug that can be characterized as positive or neutral.

Webcast Details

Definium Therapeutics management will

host a webcast at 8:00 a.m. EDT to review the Panorama topline results. Listeners can register for the webcast via this link.

Analysts wishing to participate in the question-and-answer session should use this link. A replay of the webcast will be available

via the Investor Relations section of the Definium Therapeutics website, ir.definiumtx.com, and archived for at least 30 days

after the webcast. Those who plan to participate are advised to join 15 minutes before the start time.

Definium Therapeutics Announces Positive Topline Results from Phase 3 Panorama Study of DT120 ODT in Generalized Anxiety Disorder

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About Panorama

Panorama (MM120-301) is a Phase 3, multicenter,

randomized, double-blind, placebo-controlled study evaluating the efficacy and safety of DT120 Orally Disintegrating Tablet (ODT) in

adults with generalized anxiety disorder (GAD). The study enrolled participants 18 to 74 years of age with a DSM-5-confirmed primary

diagnosis of GAD and a minimum Hamilton Anxiety Rating Scale (HAM-A) total score of 20 at screening and baseline. Eligible participants

were randomized 2:1:2 to receive a single dose of DT120 ODT 100 µg, DT120 ODT 50 µg, or matching placebo, with the 50 µg

arm included to help mitigate functional unblinding. The study consists of a 12-week double-blind treatment period (Part A) followed

by a 40-week open-label extension (Part B), during which participants may be eligible to receive up to four additional doses of

DT120 ODT 100 μg based on symptom severity, for a total study duration of approximately 56 weeks. The primary endpoint is change from

baseline in HAM-A total score at Week 12. Key secondary multiplicity-controlled endpoints are change from baseline in Clinical Global

Impression-Severity (CGI-S) scale score at Week 12, change from baseline in HAM-A total score at Week 1, and change from baseline in

CGI-S score at Day 2. Panorama enrolled 245 participants across approximately 32 study centers.

About Generalized Anxiety Disorder

(GAD)

GAD is one of the most common psychiatric

disorders, affecting approximately 26 million U.S. adults.1,2 People

with GAD experience constant, overwhelming worry that is hard to control. Common symptoms include fatigue, muscle tension, trouble concentrating,

and difficulty sleeping.3 GAD is associated with the

development of other chronic physical illnesses, as well as depression, other anxiety disorders, and trauma-related conditions. Together,

these issues can seriously impact a person’s daily life, including substantial functional, economic, and quality-of-life burdens,

and are associated with increased healthcare utilization and costs.4,5,6 Despite

the significant personal and societal burden of GAD, there has been little innovation in the treatment of GAD in the past several decades,

with the last new drug approval occurring in 2007.7

About DT120 Orally Disintegrating

Tablet (ODT)

DT120 ODT is an ergoline derivative

belonging to the group of classic serotonergic psychedelics, which acts as a partial agonist at 5-hydroxytryptamine serotonin-2A (5-HT2A)

receptors. DT120 ODT is Definium's proprietary and pharmaceutically optimized formulation of Lysergide (LSD). DT120 ODT is an advanced

formulation incorporating Catalent's Zydis® ODT fast-dissolve technology, designed to deliver several unique advantages, including

faster absorption and onset of transient cognitive, perceptual, and affective changes, improved bioavailability, and a lower incidence

of gastrointestinal side effects. Definium is developing DT120 ODT, the tartrate salt form of lysergide, for generalized anxiety disorder

(GAD), major depressive disorder (MDD), and posttraumatic stress disorder (PTSD), and is exploring its potential applications in other

serious brain health disorders. DT120 has received Breakthrough Therapy designation from the FDA for GAD and MDD. Definium maintains

a strong foundation to protect and extend the long-term value of the DT120 ODT franchise through a multi-layered intellectual property

strategy spanning composition, formulation, and methods-of-use patents.

About Lysergide (LSD)

Lysergide (LSD) is one of the most extensively

studied psychopharmaceuticals in history, with over 1,000 published reports.8 First synthesized in 1938 by Swiss chemist Albert

Hofmann in his search for active principles from ergot fungus, its profound psychological effects were discovered in 1943, which transformed

psychiatric research.8 LSD, a definitional classic

psychedelic, temporarily alters perception, cognition, and emotion, is physiologically safe and non-addictive, and is not associated

with withdrawal.8 While its precise mechanism of action

in the treatment of psychiatric illness is unknown, its acute perceptual, cognitive, and affective effects are mediated by agonism of

the serotonin 5-hydroxytryptamine 2A (5-HT2A) receptor, and mechanistic hypotheses suggest that it causes sustained increases in neuroplasticity

in a variety of brain regions.9,10

Definium Therapeutics Announces Positive Topline Results from Phase 3 Panorama Study of DT120 ODT in Generalized Anxiety Disorder

3

About Definium Therapeutics

The mission of Definium Therapeutics

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. Guided by a recognition that patients deserve more than better, Definium is relentlessly advancing a new generation

of therapeutics intended to address underlying causes of psychiatric and neurological disorders. By turning evidence into impact, Definium

aims to change the trajectory of today's mental health care crisis and enable a healthier future. Headquartered in New York, Definium

Therapeutics trades on Nasdaq under the symbol DFTX.

Forward-Looking Statements

Certain statements in this news release

related to the Company constitute "forward-looking information" within the meaning of applicable securities laws and are prospective

in nature. Forward-looking information is not based on historical facts, but rather on current expectations and projections about future

events and are therefore subject to risks and uncertainties which could cause actual results to differ materially from the future results

expressed or implied by the forward-looking statements. These statements generally can be identified by the use of forward-looking words

such as "will", "may", "should", "could", "intend", "estimate", "plan",

"anticipate", "expect", "believe", "potential" or "continue", or the negative thereof

or similar variations. Forward-looking information in this news release includes, but is not limited to, statements regarding the Company’s

planned pre-NDA meeting in 4Q 2026; the Company’s anticipated NDA filing in 1H 2027; the potential best in class profile of DT120

ODT; the potential for DT120 ODT to hold a response for months without the patient managing a pill every day; DT120 ODT’s potential

to change how we think about long-term management; and potential applications for DT120 ODT in other serious brain health disorders.

There are numerous risks and uncertainties that could cause actual results and the Company's plans and objectives to differ materially

from those expressed in the forward-looking information, including history of negative cash flows; limited operating history; incurrence

of future losses; availability of additional capital; compliance with laws and regulations; legislative and regulatory developments,

including decisions by the Drug Enforcement Administration and states to reschedule any of the Company's product candidates, if approved,

containing Schedule I controlled substances, before they may be legally marketed in the U.S.; difficulty associated with research and

development; risks associated with clinical studies or studies; heightened regulatory scrutiny; early stage product development; clinical

study risks; regulatory approval processes; novelty of the psychedelic inspired medicines industry; ability to maintain effective patent

rights and other intellectual property protection for the Company's product candidates, the Company's expectations regarding the size

of the eligible patient populations for its lead product candidates, if approved and commercialized; the Company's ability to identify

third-party treatment sites to conduct its trials and its ability to identify and train appropriate qualified healthcare practitioners

to administer its treatments; the pricing, coverage and reimbursement of the Company's lead product candidates, if approved and commercialized;

the rate and degree of market acceptance and clinical utility of the Company's lead product candidates, in particular, and controlled

substances, in general as well as those risk factors discussed or referred to herein and the risks, uncertainties and other factors described

in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2025 and its Quarterly Reports on Form 10-Q

for the fiscal quarters ended March 31, 2026 and June 30, 2026, under headings such as "Special Note Regarding Forward-Looking

Statements," and "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations"

and other filings and furnishings made by the Company with the securities regulatory authorities in all provinces and territories of

Canada which are available under the Company's profile on SEDAR+ at www.sedarplus.ca and with the U.S. Securities and Exchange

Commission on EDGAR at www.sec.gov. Except as required by law, the Company undertakes no duty or obligation to update any forward-looking

statements contained in this release as a result of new information, future events, changes in expectations, or otherwise.

Definium Therapeutics Announces Positive Topline Results from Phase 3 Panorama Study of DT120 ODT in Generalized Anxiety Disorder

4

References

1. Ringeisen, H., et al. (2023). Mental

and substance use disorders prevalence study (MDPS): Findings report. RTI International and current U.S. Census data and internal company

estimates.

2. Ferries, E., et al. The Prevalence

and Burden of Generalized Anxiety Disorder in the United States Healthcare System: Real-World Prevalence and Incidence from 2020-2023.

Journal of Mood and Anxiety Disorders. 2026;13.

3. Patriquin, M. A., & Mathew,

S. J. (2017). The neurobiological mechanisms of generalized anxiety disorder and chronic stress. Chronic Stress. Mar 2017;1:1-10.

4. Barrera, T. L., & Norton,

P. J. (2009). Quality of life impairment in generalized anxiety disorder, social phobia, and panic disorder. Journal of Anxiety Disorders.

2009;23(8):1086–1090.

5. Armbrecht, E., Shah, R., Poorman,

G. W., et al. (2021). Economic and humanistic burden associated with depression and anxiety among adults with non-communicable chronic

diseases (NCCDs) in the United States. Journal of Multidisciplinary Healthcare. 2021;14;887–896.

6. Newman, M. G., Llera, S. J., Erickson,

T. M., Przeworski, A., & Castonguay, L. G. (2013). Worry and generalized anxiety disorder: A review and theoretical synthesis

of evidence on nature, etiology, mechanisms, and treatment. Annual Review of Clinical Psychology, 2013;9:275–297.

7. U.S. Food and Drug Administration.

(2007, August 9). FDA approves Cymbalta for treatment of generalized anxiety disorder [Press release]. https://investor.lilly.com/static-files/499f0aa3-281f-49f4-9655-049aae179593.

8. Nichols, DE. “Psychedelics.”

Pharmacological Reviews. 2016;68(2):264-355.

9. Passie, T, Halpern, JH, Stichtenoth,

DO, et al. “The Pharmacology of Lysergic Acid Diethylamide: A Review.” CNS Neuroscience & Therapeutics. 2008;14:295-314.

10. Liechti, ME. “Modern clinical

research on LSD.” Neuropsychopharmacology. 2017;42:2114-2127.

Investors:

Gitanjali Jain

VP, Head of Investor Relations

ir@definiumtx.com

Media:

media@definiumtx.com

Definium Therapeutics Announces Positive Topline Results from Phase 3 Panorama Study of DT120 ODT in Generalized Anxiety Disorder

5

EX-99.2 — EXHIBIT 99.2

EX-99.2

Filename: tm2625365d1_ex99-2.htm · Sequence: 3

Exhibit 99.2

Phase 3 Panorama Study Topline Data Readout

This presentation (the “Presentation”) has been prepared by Definium Therapeutics, Inc. (“Definium”, the “Company”, “we”, “ou r” or “us") solely for informational purposes. This Presentation does not constitute an offering of, or a solicitation of an off er to purchase, securities of Definium and under no circumstances is it to be construed as a prospectus or advertisement or public offering of securitie s. Any trademarks included herein are the property of the owners thereof and are used for reference purposes only. Such use shou ld not be construed as an endorsement of the products or services of Definium. Any amounts are in USD unless otherwise noted. Definium’s securities hav e not been approved or disapproved by the U.S. Securities and Exchange Commission (the "SEC") or by any state, provincial or oth er securities regulatory authority, nor has the SEC or any state, provincial or other securities regulatory authority passed on the accurac y o r adequacy of this Presentation. Any representation to the contrary is a criminal offense. Cautionary Note Regarding Forward - Looking Statements This Presentation contains, and our officers and representatives may from time to time make, “forward - looking statements” within the meaning of applicable securities laws and are prospective in nature. Forward - looking statements are not based on historical facts, but rather on current expectations and projections about future events and are therefore subject to risks and uncertainties which could cau se actual results to differ materially from the future results expressed or implied by the forward - looking statements. These sta tements generally can be identified by the use of forward - looking words such as “will”, “may", “should”, “could”, “intend”, “estimate”, “plan”, “antic ipate”, “expect”, “believe”, “potential”, “continue”, “budget”, “scheduled”, “forecasts”, “intends”, “anticipates”, “projects ” o r the negative thereof or similar variations. Forward - looking statements in this Presentation include, but are not limited to, statements regarding the an ticipated design, timing, progress and results of our investigational programs for DT120 oral disintegrating tablet (“ODT”), a p roprietary, pharmaceutically optimized form of lysergide tartrate for the treatment of generalized anxiety disorder, major depressive dis ord er and posttraumatic stress disorder (including the anticipated topline readout for the Ascend study); the timing of our pre - NDA meeting scheduled for the fourth quarter of 2026; our anticipated NDA filing in the first half of 2027; the success and timing of our development activities; our ability to meet the milestones set forth herein; the likelihood of success of any clinical trials or of obtai nin g U.S. Food and Drug Administration (“FDA”) or other regulatory approvals; our beliefs regarding potential benefits and side effects (or lack ther eof ) of DT120 ODT; our belief that DT120 ODT represents a best - in - class profile; the potential commercial opportunity for DT120 ODT , if approved, including total addressable market and revenue opportunity; our plans to continue to advance commercial readiness activities, including pa tient education, access and support, and site of care readiness; our cash runway; our ability to successfully execute on our pla nned clinical, regulatory and commercial preparation activities; and the potential for psychedelics as a class of treatment options in psych iat ry. There are numerous risks and uncertainties that could cause actual results, plans and objectives to differ materially from th ose expressed in forward - looking statements, including history of negative cash flows, limited operating history, incurrence of fut ure losses, availability of additional capital, compliance with laws and regulations, difficulty associated with research and development, risks associat ed with clinical trials or studies, heightened regulatory scrutiny, early stage product development, clinical trial risks, regul ato ry approval processes, novelty of the psychedelic inspired medicines industry, our ability to maintain effective patent rights and other intellectua l p roperty protection for our product candidates, our expectations regarding the size of the eligible patient populations for ou r l ead product candidates, if approved and commercialized; our ability to identify third - party treatment sites to conduct our trials and our ability to identi fy and train appropriate qualified healthcare practitioners to administer our treatments; the pricing, coverage and reimburse men t of our lead product candidates, if approved and commercialized; the rate and degree of market acceptance and clinical utility of our lead product ca ndidates, in particular, and controlled substances, in general; as well as those risk factors described in the Company's Annu al Report on Form 10 - K for the fiscal year ended December 31, 2025, the Company’s Quarterly Report on Form 10 - Q for the quarterly period ended March 31, 20 26, and the Company’s Quarterly Report on Form 10 - Q for the quarterly period ended June 30, 2026, under headings such as “Specia l Note Regarding Forward - Looking Statements,” and “Risk Factors” and “Management's Discussion and Analysis of Financial Condition and R esults of Operations” and other filings and furnishings made by the Company with the securities regulatory authorities in all pr ovinces and territories of Canada which are available under the Company's profile on SEDAR+ at www.sedarplus.ca and with the SEC on EDGAR at www.sec.gov. Any forward - looking statement made by Definium in this Presentation is based only on information currently available to the Comp any and speaks only as of the date on which it is made. Except as required by law, the Company undertakes no duty or obligati on to update any forward - looking statements contained in this Presentation as a result of new information, future events, changes in expectations or otherwise. Cautionary Note Regarding Regulatory Matters The United States federal government regulates drugs through the Controlled Substances Act. DT120 ODT is a proprietary, pharm ace utically optimized form of lysergide D - tartrate and DT402, or R( - ) - MDMA, is our proprietary form of the R - enantiomer of MDMA (3, 4 - methylenedioxymethamphetamine). Lysergide and MDMA are Schedule I substances under the Controlled Substances Act. While the C omp any is focused on programs using psychedelic or hallucinogenic compounds and non - hallucinogenic derivatives of these compounds, including in DT120 ODT, DT402 and its other product candidates, the Company does not have any direct or indirect involvement wit h the illegal selling, production or distribution of any substances in the jurisdictions in which it operates. The Company is a neuro - pharmaceutical drug development company and does not deal with psychedelic or hallucinogenic substances except within laboratory and clinica l t rial settings conducted within approved regulatory frameworks. The Company's products will not be commercialized prior to app lic able regulatory approval, which will only be granted if clinical evidence of safety and efficacy for the intended uses is successfully develo ped . Market and Industry Data This Presentation includes market and industry data that has been obtained from third party sources, including industry publi cat ions. Definium believes that the industry data is accurate and that the estimates and assumptions are reasonable, but there i s n o assurance as to the accuracy or completeness of this data. Third party sources generally state that the information contained therein has been ob tai ned from sources believed to be reliable, but there is no assurance as to the accuracy or completeness of included informatio n. Although the data is believed to be reliable, Definium has not independently verified any of the data from third party sources referred to in this Pr esentation or ascertained the underlying economic assumptions relied upon by such sources. References in this Presentation to re search reports or to articles and publications should not be construed as depicting the complete findings of the entire referenced report or artic le. Definium does not make any representation as to the accuracy of such information. Panorama Topline Results | September 2026 2 Disclaimer

Opening Remarks Rob Barrow Chief Executive Officer

Thank you to our study participants, investigators and partners who made Panorama possible

Significant need for innovation in the treatment of GAD 5 Population prevalence increased from 3% to 10% over last 20 years 1 No new drugs approved for GAD since 2007 Significant disease burden , with impairment in daily functioning, work productivity and quality of life Panorama Topline Results | September 2026 1. Generalized Anxiety Disorder, https://www.nimh.nih.gov/health/statistics/generalized - anxiety - disorder; Mental and Substance Use Disorders Prevalence Study, https://www.rti.org/publication/mental - substance - use - disorders - prevalence - study - findings - report GAD: generalized anxiety disorder

Panorama Topline Results | September 2026 6 Third Positive Pivotal Readout for DT120 ODT 100 µg 1. Clinical study designs subject to change based on ongoing regulatory discussion and review, including of Phase 3 clinical tri al protocols 2. Includes the primary endpoint and all hierarchically controlled key secondary endpoints. DB: double blind; ODT: orally disintegrating tablet; OL: open - label; RCT: randomized controlled trial Generalized Anxiety Disorder (GAD) Major Depressive Disorder (MDD) n=214 1 :1 randomization DT120 ODT vs. Placebo ▪ Part A: 12 - week DB, RCT ▪ Part B: 40 - week Extension with OL Treatment n=245 2:1:2 randomization DT120 ODT vs. Placebo including 50 µg control ▪ Part A: 12 - week DB, RCT ▪ Part B: 40 - week Extension with OL Treatment n=149 1:1 randomization DT120 ODT vs. Placebo ▪ Part A: 12 - week DB, RCT ▪ Part B: 40 - week Extension with OL Treatment Target n=165 1 2:1:2 randomization DT120 ODT vs. Placebo including 50 µg control ▪ Part A: 12 - week DB, RCT ▪ Part B: 40 - week Extension with OL Treatment Target n=200 1 1:1 randomization DT120 ODT vs. Placebo ▪ Part A: 12 - week DB, RCT ▪ Part B: 40 - week Extension with OL Treatment Posttraumatic Stress Disorder (PTSD) Met All Primary & Key Secondaries 2 Met All Primary & Key Secondaries 2 Enrolling Planning Met All Primary & Key Secondaries 2 Study met all primary and key secondary endpoints & consistent with dose response demonstrated in Phase 2bRF1 JS2

Panorama Topline Results | September 2026 7 Panorama Results Demonstrate Potential Best - in - Class Efficacy in Generalized Anxiety Disorder 1 Limited side effect burden Efficient session dynamics Rapid, robust and durable efficacy after single dose ▪ All primary and key secondary endpoints highly statistically significant ▪ 5.1 point HAM - A improvement over placebo at week 12 primary endpoint (p<0.0001) ▪ 5.3 point HAM - A improvement over placebo at week 1 (p<0.0001) ▪ 0.8 point CGI - S improvement over placebo at day 2 (p<0.0001) ▪ Results consistent with Phase 2 dose - response data ▪ DT120 ODT 100 µg was generally well tolerated with no new safety signals identified ▪ No suicidality signal or suicidal behavior ▪ 6.2 hour average time to clear End of Session Checklist (EoSC) ▪ 94% participants cleared EoSC by 8 hours 1. Source: Panorama study documents. Safety population in study part A (through week 12) CGI - S: Clinical Global Impression - Severity Scale; HAM - A: Hamilton Anxiety Scale; ODT: orally disintegrating tablet JS1 RB2 JS3 JS4JS5JS6 JS7 RF8 JS9 JS10 JS11

8 Panorama Topline Results | September 2026 DT120 Dose Response Relationship Highlights 1. Based on Phase 2b best - fit prespecified dose response model (Emax) at week 4; per protocol population. 2. ITT population. Placebo - adjusted HAM - A at week 12 using a Mixed - Effects Model Repeated Measures (MMRM) statistical analysis with reference - based imputation. 3. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. GAD: generalized anxiety disorder Phase 3 Results Align with DT120 Dose - Response Model Largest separation from placebo observed at 100 µ g ▪ Week 4: 50% less separation at 50 µg 3 ▪ Week 12: 29% less separation at 50 µg Dose response observed despite ‘functional unblinding’ at all doses ▪ 91% and 95% of participants at 50 and 100 µg correctly guessed assignment to drug Phase 3 results align with dose - response model established in Phase 2b Results support the conclusion that DT120 dose response is not attributable to functional unblinding -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 25 50 75 100 125 Placebo - adjusted HAM - A Change DT120 Dose (µg) Phase 2b Dose Response Model (mean +/ - SD) 1 2 2 Phase 2b results RB1 RB2 JS3JS4 JS5JS6 JS7 JS8 BR9

Panorama Topline Results | September 2026 9 Benefit - Risk Highlights Differentiation of DT120 ODT 100 µg 1. Mechanism - based adverse event rates based on number of participants experiencing in Part A; safety population. Adverse event cat egories are a summary of MedDRA preferred terms that represent distinct domains of anticipated lysergide effects. 2. Dashed line represents target product profile: durable efficacy of 4 points or greater which represents a potential best - in - clas s profile. EoSC: end of session checklist; HAM - A: Hamilton Anxiety Rating Scale; MedDRA: Medical Dictionary for Regulatory Activities Efficacy target only achieved at 100 µg with similar adverse event profile across doses Placebo - Adjusted Change in HAM - A Mechanism - based Adverse Event Rates 1 DT120 ODT 100 µ g DT120 ODT 50 µ g Median time to EoSC clearance: 6 hours Week 1 Week 2 Week 4 Week 8 Week 12 -8 -7 -6 -5 -4 -3 -2 -1 0 Week 1 Week 2 Week 4 Week 8 Week 12 Efficacy Target 2 87% Perceptual changes 66% Affective changes 18% Behavioral changes 27% Changes in thinking 78% Perceptual changes 65% Affective changes 4% Behavioral changes 35% Changes in thinking - 4 Median time to EoSC clearance: 6 hoursRB1 JS2

Panorama Topline Results | September 2026 10 DT120 100 µg Efficacy Stands Out Against Approved GAD Treatments 1 DT120 observed effect size consistently larger than GAD standard of care 1) The information presented in this slide is derived from multiple clinical trials, each conducted under distinct protocols and settings. As such, these data may not be directly comparable due to the lack of a head - to - head comparison. Differences in trial design, patient demographics, and other variables may account for variations in the observed outcomes. Study results fo r e ach drug are intended to be representative, however, multiple trials of the approved treatments have been conducted with varying results, including results that may have demonstrated a larger or smaller treatment effect than those presented. Bu spirone and benzodiazepines are approved for anxiety disorders which include GAD; 2) R Robison, JAMA. 2025 Sep 4; e2513481. doi:10.1001/jama.2025.13481 ; 3) Source: Voyage study documents; 4) Source: Panorama study documents ; 5) RB Hidalgo, J Psychopharmacol. 2007 Nov;21(8):864 - 72 GAD: generalized anxiety disorder, SRI: serotonin reuptake inhibitors 5 Benzodiazepines SRIs Buspirone 5 5 3 4 Phase 2b 2 3 4 Phase 2b 2 0.81 0.81 0.64 0.88 0.99 0.96 0.38 0.36 0.17 0.0 0.2 0.4 0.6 0.8 1.0 Effect Size Week 4 Week 12 JS1 JS2 RB3

Phase 3 Panorama Study Results Part A – Topline Results Dan Karlin, MD Chief Medical Officer

Panorama Trial Design 1. Source: Definium internal study documents. 2. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. ePRO: electronic Patient - Reported Outcome; GAD: generalized anxiety disorder; GAD - 7: a multipurpose instrument for screening, di agnosing, monitoring and measuring the severity of anxiety; HAM - A: Hamilton Anxiety Rating Scale; ODT: orally disintegrating tablet; µg: microgram DT120 ODT 1 00 µg n=96 DT120 ODT 5 0 µg control 2 n=52 Part A 12 Week Randomized, Double - Blind Part B 40 Week Extension with Opportunity for Open - Label Treatment PHASE 3 STUDY 1 Single Dose Primary Endpoint: HAM - A at Week 12 Statistical analyses & endpoints only compare 100 µg vs placebo Up to four open - label doses of DT120 ODT 1 00 µg Follow - up Observation GAD - 7 (ePRO): biweekly HAM - A (central rater): monthly or when GAD - 7 ≥ 10 Potential Treatment Eligible for open - label treatment if HAM - A ≥ 16 12 Panorama Topline Results | September 2026 Placebo n=97 JS1 JS2

13 1. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. ITT: intent to treat; ODT: orally disintegrating tablet Participant Disposition Panorama Topline Results | September 2026 Randomized n=245 DT120 ODT 100 µg n=96 DT120 ODT 50 µg control 1 n=52 Placebo ODT n=97 ▪ 100% included in ITT population ▪ 90% completed Part A ▪ 100% included in ITT population ▪ 90% completed Part A ▪ 100% included in ITT population ▪ 87% completed Part A DF1 JS2

14 1. Based on ITT population. 2. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. 3. Mean (SD). 4. The HAM - A is a 14 - item clinician - rated outcome measure assessing various domains of anxiety with a range of 0 - 56. In Panorama, H AM - A ratings were assessed by central raters blinded to both treatment assignment and visit number. 5. The CGI - S is a clinician - rated outcome measure assessing overall severity of illness with a range of 1 to 7. 6. Psychedelics include LSD, psilocybin, dimethyltryptamine and other classic serotonergic psychedelics. CGI - S: Clinical Global Impressions – Severity Scale; HAM - A: Hamilton Anxiety Rating Scale; ITT: intent to treat; LSD: lysergic a cid diethylamide; ODT: orally disintegrating tablet Demographics & Baseline Characteristics 1 Overall n=245 Placebo ODT n=97 DT120 ODT 50 µ g control 2 n=52 DT120 ODT 100 µ g n=96 Demographic 40.9 42.3 40.4 39.8 Mean age (years) 60% 62% 56% 62% Sex (% female) 83% 84% 85% 82% Race (% white) 28.0 (5.4) 28.0 (5.6) 27.7 (4.8) 28.3 (5.5) Baseline HAM - A score 3,4 4.7 (0.6) 4.7 (0.6) 4.7 (0.6) 4.7 (0.5) Baseline CGI - S score 3.5 Past Psychedelic Use, n (%) 35 (14%) 16 (17%) 8 (15%) 11 (12%) Any psychedelic 6 16 (7%) 8 (8%) 4 (8%) 4 (4%) LSD Panorama Topline Results | September 2026DF1PJ2 JS3 RB4

15 1. Based on ITT population 2. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. 3. Mean (SD) 4. Eligibility criteria required a baseline HAM - A score of 20 or greater; Moderate symptoms are defined as a HAM - A score of 16 – 23 . 5. Eligibility criteria excluded participants currently in a major depressive episode. GAD: generalized anxiety disorder; HAM - A: Hamilton Anxiety Rating Scale; ITT: intent to treat; MADRS: Montgomery - Åsberg Depress ion Rating Scale; MDD: major depressive disorder; ODT: orally disintegrating tablet; SD: standard deviation Baseline Characteristics | Representative of GAD Patients with High Burden of Disease 1 Panorama Topline Results | September 2026 Overall n=245 Placebo ODT n=97 DT120 ODT 50 ug control 2 n=52 DT120 ODT 100 µ g n=96 Diagnostic Trait 28.0 (5.4) 28.0 (5.6) 27.7 (4.8) 28.3 (5.5) HAM - A score 2 HAM - A severity, n (%) 56 (23%) 27 (28%) 9 (17%) 20 (21%) Moderate (<24) 4 189 (77%) 70 (72%) 43 (83%) 76 (79%) Severe (≥24) Number of past GAD treatments, n (%) 60 (25%) 17 (18%) 14 (27%) 29 (30%) 0 57 (23%) 22 (23%) 15 (29%) 20 (21%) 1 128 (52%) 58 (60%) 23 (44%) 47 (49%) 2+ 70 (29%) 25 (26%) 17 (33%) 28 (29%) Comorbid MDD 5 , n (%) 13.4 (4.2) 13.5 (3.9) 13.4 (4.5) 13.3 (4.4) MADRS score 3 8.6 (9.0) 9.9 (8.8) 9.4 (11.4) 6.9 (7.6) Years since Diagnosis of GAD 3 17.8 (13.6) 19.1 (13.4) 18.2 (15.5) 16.4 (12.6) Years since Onset of GAD Symptoms 3PJ1 RF2 JS3 RB4

Primary Endpoint: HAM - A Change from Baseline to Week 12 16 1. Source: Panorama study documents. ITT population. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designe d o r powered for statistical comparisons. 2. Primary endpoint of the study was change in HAM - A at week 12 between 100 µg and placebo using a Mixed - Effects Model Repeated Mea sures (MMRM) statistical analysis with reference - based imputation. HAM - A: Hamilton Anxiety Rating Scale; LS Mean: least squares mean; ODT: orally disintegrating tablet; SEM: standard error of the mean DT120 ODT 100 µg Showed Statistically & Clinically Significant HAM - A Improvements at All Timepoints 1,2 Panorama Topline Results | September 2026 **** **** **** **** **** Week 1 Week 2 Week 4 Week 8 Week 12 Change from Baseline 2 Improvement over Placebo 2 ****p<0.0001 (DT120 100 µg vs placebo) Highlights -15 -10 -5 0 LS Mean Change (SEM) in HAM - A score DT120 ODT 100 µg DT120 ODT 50 µg control Placebo ODT 50 µg 100 µg - 10.3 - 9.8 ▪ Week 1: - 8.8 - 12.3 ▪ Week 4: - 8.1 - 10.4 ▪ Week 8: - 8.3 - 9.8 ▪ Week 12: 50 µg 100 µg - 5.8 - 5.3 ▪ Week 1: - 3.5 - 7.0 ▪ Week 4: - 3.0 - 5.3 ▪ Week 8: - 3.6 - 5.1 ▪ Week 12: BR1 PJ2 JS3 JS4

Change from Baseline 2 Improvement over Placebo 2 17 1. Source: Panorama study documents. ITT population. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designe d o r powered for statistical comparisons. 2. Key secondary endpoints of the study was change in CGI - S at day 2 and week 12 between 100 µg and placebo using a Mixed - Effects M odel Repeated Measures (MMRM) statistical analysis with reference - based imputation. CGI - S: Clinical Global Impressions – Severity scale; LS Mean: least squares mean; ODT: orally disintegrating tablet; SEM: standa rd error of the mean DT120 ODT 100 µg Showed Statistically & Clinically Significant CGI - S Improvements at All Timepoints 1,2 Panorama Topline Results | September 2026 **** **** **** **** **** Week 1 Week 2 Week 4 Week 8 Week 12 **** Day 2 Key Secondary Endpoint: CGI - S Change from Baseline to Week 12 Highlights ****p<0.0001 (DT120 100 µg vs placebo) -1.5 -1.0 -0.5 0.0 LS Mean Change (SEM) in CGI - S score DT120 ODT 100 µg DT120 ODT 50 µg control Placebo ODT 50 µg 100 µg - 1.1 - 1.1 ▪ Day 2: - 1.3 - 1.2 ▪ Week 1: - 1.2 - 1.4 ▪ Week 4: - 0.9 - 1.1 ▪ Week 12: 50 µg 100 µg - 0.8 - 0.8 ▪ Day 2: - 0.8 - 0.7 ▪ Week 1: - 0.7 - 1.0 ▪ Week 4: - 0.4 - 0.6 ▪ Week 12:PJ1 JS2 JS3

18 DT120 ODT 100 µg Effects Supported by Robust, Clinically Significant Response and Remission Rates 1 Panorama Topline Results | September 2026 Remission Rate at Week 12 Response Rate at Week 12 1. Source: Panorama study documents. ITT population. Pre - planned secondary endpoints. HAM - A: Hamilton Anxiety Rating Scale; ODT: orally disintegrating tablet ** p<0.01; *p<0.05 * * Placebo ODT DT120 ODT 100 µg ** Mild or Better at Week 12 15% 4% 0% 10% 20% 30% 40% 50% 60% Remission HAM - A ≤ 7 Odds ratio: 4.2 35% 17% 0% 10% 20% 30% 40% 50% 60% Mild or better HAM-A < 16 Odds ratio: 2.6 32% 14% 0% 10% 20% 30% 40% 50% 60% Response HAM - A ≥ 50% Improvement Odds ratio: 2.9 BR1 DF2 PJ3 JS4

19 1. Source: Panorama study documents. Subgroup analysis of ITT population; 100 µg and placebo groups only. 2. Data presented as Least Squares mean ± standard error. 3. For each subgroup, the change from baseline in HAM - A total score is analyzed using the same MMRM model as the primary efficacy a nalysis. If the number of patients is small for a subgroup, the treatment difference will not be stable as it would be highly sensitive to outliers. Δ : change; GAD: generalized anxiety disorder; HAM - A: Hamilton Anxiety Rating Scale; MMRM: Mixed - Effects Model Repeated Measures Treatment Effect Maintained Across Key Subgroups – Including Those Failed by 2+ Prior Treatments 1 Panorama Topline Results | September 2026 Placebo Adjusted Δ Subgroup Analysis of HAM - A Change at Week 12 2, 3 7 6 5 4 3 2 1 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 All participants Time since onset <22 yrs (n=135) > 22 yrs (n=58) Previous GAD Medications Less than two (n=88) Two or more (n=105) Sex Male (n=74) Female (n=119) Favors DT120 Favors Placebo DF1 RF2 RB3 JS4 JS5

DT120 ODT 100 µg was Generally Well - Tolerated and Consistent with Prior Clinical Experience 1 1. Source: Panorama study documents. Safety population in study part A (through week 12). 2. Participant suicidality assessment based on changes in C - SSRS. C - SSRS: Columbia - Suicide Severity Rating Scale; ODT: orally disintegrating tablet ▪ AE profile consistent with prior studies of DT120 ▪ Most adverse events (AEs) were mild - to - moderate in severity ▪ Most treatment emergent AEs (TEAEs) occurred and resolved on dosing day ▪ No drug related serious adverse events (SAEs) Favorable tolerability profile No suicidal behavior or suicidality signal 2 ▪ No suicidal or self - injurious behavior ▪ No indication of increased suicide - related risk 20 Panorama Topline Results | September 2026 RF1 JS2 JS3 JS4 JS5 JS6

Panorama Topline Results | September 2026 21 Adverse Events Were Generally Mild - to - Moderate in Severity 1,2 Placebo ODT n=97 DT120 ODT 50 µ g control 3 n=51 DT120 ODT 100 µ g n=96 Adverse Event 61 (63%) 49 (96%) 91 (95%) Any TEAE 30 (31%) 29 (57%) 51 (53%) Mild 29 (30%) 19 (37%) 39 (41%) Moderate 2 (2%) 1 (2%) 1 (1%) Severe 34 (35%) 47 (92%) 90 (94%) Any Study Drug - Related TEAE 31 (32%) 43 (84%) 84 (88%) Any Adverse Event of Special Interest (AESI) 1 (1%) 1 (2%) 2 (2%) Any SAE 4 0 0 0 Any Treatment Related SAE 0 0 0 Any TEAE Leading to Discontinuation 0 0 0 Any TEAE Leading to Death 1. Source: Panorama study documents. Safety population in study part A. 2. Adverse events were collected in accordance with FDA Final Guidance for Psychedelic Drug Development, which includes expected ef fects characterized as positive, favorable, or neutral. 3. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. 4. All SAEs were deemed unrelated to the study drug. AESI: adverse event of special interest; ODT: orally disintegrating tablet; SAE: serious adverse event; TEAE: treatment - emergent adverse eventPJ1 PJ2 RF3 RF4 JS5 JS6 JS7 JS8 RB9

22 Most Common TEAEs Demonstrated Favorable Tolerability Profile of DT120 ODT 100 µg 1,2,3 Panorama Topline Results | September 2026 After Dosing Day Dosing Day TEAEs with Incidence ≥10% Placebo ODT (n=97) DT120 ODT 50 µ g control 4 (n=51) DT120 ODT 100 µ g (n=96) Placebo ODT (n=97) DT120 ODT 50 µ g control 4 (n=51) DT120 ODT 100 µ g (n=96) 0 0 3 (3%) 12 (12%) 31 (61%) 65 (68%) Illusion 1 (1%) 4 (8%) 2 (2%) 4 (4%) 13 (26%) 35 (37%) Nausea 10 (10%) 6 (12%) 13 (14%) 13 (13%) 14 (28%) 23 (24%) Headache 0 0 1 (1%) 5 (5%) 16 (31%) 30 (31%) Euphoric Mood 4 (4%) 1 (2%) 7 (7%) 6 (6%) 5 (10%) 22 (23%) Fatigue 0 1 (2%) 1 ( 1%) 3 (3%) 10 (20%) 22 (23%) Dizziness 5 (5%) 3 (6%) 6 (6%) 7 (7%) 7 (14%) 16 (17%) Anxiety 0 1 (2%) 0 0 6 (12%) 20 (21%) Crying 1 (1%) 0 0 6 (6%) 2 (4%) 14 (15%) Feeling cold 1 (1%) 1 (2%) 0 3 (3%) 4 (8%) 13 (14%) Paraesthesia 0 0 0 1 (1%) 4 (8%) 13 (14%) Time Perception Altered 0 0 1 (1%) 11 (11%) 8 (16%) 12 (13%) Feeling of Relaxation 0 0 0 0 4 (8%) 12 (13%) Inappropriate Affect 0 0 0 4 (4%) 4 (8%) 11 (12%) Feeling Hot 0 0 3 (3%) 3 (3%) 3 (6%) 8 (8%) Emotional Disorder 1 (1%) 0 0 4 (4%) 7 (14%) 10 (10%) Feeling Abnormal 1 (1%) 0 1 (1%) 3 (3%) 1 (2%) 10 (10%) Restlessness 0 0 1 (1%) 1 (1%) 4 (8%) 10 (10%) Tremor 1. Source: Panorama study documents. Safety population in study part A (through week 12). 2. Adverse events were collected in accordance with FDA Guidance for Psychedelic Drug Development, which includes expected effec ts characterized as positive, favorable, or neutral. 3. AEs over 10% in the 100 µg arm are shown above 4. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. AE: adverse event; ODT: orally disintegrating tablet; TEAE: treatment - emergent adverse eventPJ1 RF2 RF3 JS4 JS5 JS6 JS7 JS8 JS9

23 1. Source: Panorama study documents. Safety population in study part A (100 µ g). Time at which participant first meets End of Session Checklist criteria. 2. Based on Interim analysis of EoSC as of September 10, 2026 from all dosing sessions in Emerge, Voyage and Panorama. ODT: orally disintegrating tablet; EoSC: End of Session Checklist 1,000+ DT120 ODT 100 µg Dosing Sessions Demonstrated a Scalable Path to Clinical Practice 1 Panorama Topline Results | September 2026 Time to End of Session Checklist (EoSC) Clearance Highlights ▪ Average time to clearance of EoSC is 6.2 hours in Panorama 1 ▪ Two thirds of participants clear EoSC at hour 6 1 ▪ 95+% of participants clear EoSC by hour 8 2 ▪ Emerging evidence of predictable 5 to 8 hour sessions All Phase 3 Studies (n=1,061 sessions) 2 Panorama (Part A; n=96) 45% 66% 88% 94% 48% 66% 87% 97% 0% 20% 40% 60% 80% 100% Hour 5 Hour 6 Hour 7 Hour 8 DF1 PJ2 RF3 BR4

Phase 3 Panorama Topline Results Part B – Interim Analysis Dan Karlin, MD Chief Medical Officer

25 1. Based on interim analysis as of August 11, 2026. Interim analysis based on partial data and subject to change. 2. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. ITT: intent - to - treat; ODT: orally disintegrating tablet Part B Disposition 1 Panorama Topline Results | September 2026 ▪ Safety population (n=244) ▪ ITT population (n=245) Part A Progress at Time of Interim Analysis Part B Randomized N=245 DT120 ODT 100 µg n=96 Placebo ODT n=97 DT120 ODT 100 µg up to 4 times n= 86 e ntered Part B ▪ Through Week 28 (n=35) ▪ Through Week 36 (n=24) ▪ Through Week 52 (n=8) ▪ Through Week 28 (n=43) ▪ Through Week 36 (n=35) ▪ Through Week 52 (n=14) DT120 ODT 100 µg up to 4 times n=76 e ntered Part B DT120 ODT 50 µg control 2 n=52 DT120 ODT 100 µg up to 4 times n=42 e ntered Part B ▪ Through Week 28 (n=19) ▪ Through Week 36 (n=10) ▪ Through Week 52 (n=3) BR1 DF2 PJ3 RF4 JS5

26 1. Based on interim analysis as of August 11, 2026. Extension population. Interim analysis based on partial data and subject t o c hange. 2. ITT population who entered Part B. Data based on Week 12 in Part A. 3. Panorama included a DT120 ODT 50 µg control arm (n=52) that was not designed or powered for statistical comparisons. CGI - S: Clinical Global Impressions – Severity Scale; HAM - A: Hamilton Anxiety Rating Scale; ITT: intent - to - treat; ODT: orally dis integrating tablet Part B Enrollment & Baseline Characteristics 1 Panorama Topline Results | September 2026 Total n=163 Placebo ODT n=68 DT120 ODT 50 µ g control 3 n=33 DT120 ODT 100 µ g n=62 Demographic (Part B) 2 41.4 42.8 42.3 39.5 Mean age (years) 58.9% 58.8% 51.5% 62.9% Sex, female (%) 84.0% 83.8% 87.9% 82.3% Race (% white) 21.1 23.3 21.6 18.3 HAM - A score at Part B Entry 4.0 4.2 4.0 3.7 CGI - S score at Part B Entry DF1 PJ2 RF3 JS4

27 1. Based on interim analysis as of August 11, 2026. Extension population. Interim analysis based on partial data and subject t o c hange. 50 µ g cohort not included due to small n. 2. n is the number of participants in the Extension population who had the specified number of doses up to the corresponding vis it. ITT: intent - to - treat; ODT: orally disintegrating tablet; OLTx: open - label treatment Treatment Patterns in Part B Provide Early Insights into Paradigm beyond 12 Weeks 1 Panorama Topline Results | September 2026 Summary of Cumulative DT120 ODT Doses through Week 28 Week 28 Week 24 Week 20 Week 16 DT120 ODT 100 µg in Part A 2 Placebo ODT in Part A 2 Part A Dose only One OLTx Two OLTx Three OLTx n=62 n=54 n=43 n=35 n=68 n=55 n=44 n=43 BR1 DF2 BR3 RF4

28 1. Based on interim analysis as of August 11, 2026. ITT Part A+B population with treatment policy strategy. Interim analysis b ase d on partial data and subject to change. 50 µ g cohort not included due to small n. 2. n is the number of participants in the ITT Part A+B population with non - missing HAM - A score at Baseline and the respective visit . HAM - A: Hamilton Anxiety Rating Scale; LS Mean: least squares mean; ODT: orally disintegrating tablet HAM - A Scores Improved Further with Additional Treatments in Part B Panorama Topline Results | September 2026 HAM - A Scores through Week 28 1,2 Placebo ODT in Part A Part A Part B Baseline -16 -14 -12 -10 -8 -6 -4 -2 0 Mean Change in HAM - A Score Week 4 Week 8 Week 12 Week 16 Week 20 Week 24 Week 28 First Open - Label Dosing 27 35 49 66 87 89 92 96 32 36 47 70 86 85 91 97 DT120 ODT, n= Placebo ODT, n= DT120 ODT 100 µ g in Part A BR1 DF2 PJ3PJ4RF5 JS6JS7 JS8

29 Subsequent Treatments Further Improved Response and Remission Rates through Week 28 1,2 Panorama Topline Results | September 2026 Mild and Remission Rates in Part B Response Rates in Part B 1. Source: Panorama study documents. Based on interim analysis as of August 11, 2026. ITT Part A+B population. Interim analysi s b ased on partial data and subject to change. 2. Only includes participants who received DT120 ODT in Part A. HAM - A: Hamilton Anxiety Rating Scale, ITT: intent - to - treat HAM - A Improvement ≥ 50% HAM - A ≤ 7 HAM - A < 16 27 35 49 66 87 n= 27 35 49 66 87 n= 15% 12% 18% 34% 19% 36% 32% 53% 66% 59% 0% 10% 20% 30% 40% 50% 60% 70% Week 12 Week 16 Week 20 Week 24 Week 28 32% 23% 51% 60% 48% 0% 10% 20% 30% 40% 50% 60% 70% Week 12 Week 16 Week 20 Week 24 Week 28 DF1 PJ2PJ3 JS4 BR5 JS6

Next Steps Rob Barrow Chief Executive Officer

Panorama Topline Results | September 2026 31 Compelling Evidence Across Four Late - Stage Trials with Complementary Designs 1 1. The information presented in this slide is derived from multiple clinical trials, each conducted under distinct protocols and se ttings. As such, these data may not be directly comparable due to the lack of a head - to - head comparison. 2. Primary endpoint in Voyage and Panorama is the change from baseline in HAM - A total score at Week 12; in Study MMED008 the primar y endpoint was change from baseline in HAM - A total score at week 4. Primary endpoint in Emerge was the change from baseline in MADRS score at Week 6. 3. Regulatory strategy for GAD & MDD to be discussed at pre - NDA meeting in 4Q 2026. HAM - A: Hamilton Anxiety Rating Scale; MADRS: Montgomery - Åsberg Depression Rating Scale, SD: standard deviation Generalized Anxiety Disorder (GAD) Primary endpoint 2 DT120 vs. placebo Design Baseline HAM - A Baseline MADRS - 5.4 p<0.0001 2 arms 27.9 13.5 7.2 Pooled endpoint SD - 5.1 p<0.0001 3 arms 28.0 13.4 8.4 Major Depressive Disorder (MDD) - 8.1 p<0.0001 2 arms 17.1 34.5 10.4 - 7.7 p<0.01 5 arms 30.2 27.2 11.1 Phase 2b Study MMED008 Robust data package aligned with FDA g uidance supports advancement of NDA submission for DT120 ODT 3BR1PJ2RF3 JS4 JS5 RB6 RB7 RB8 BR9

Panorama Topline Results | September 2026 32 Compelling Development Program Supporting Plans for DT120 ODT New Drug Application 1. Registrational program represents studies anticipated to be required at the time of NDA submission; additional studies, inclu din g Part B of Phase 3 studies, are ongoing. 2. Regulatory filing strategy for GAD & MDD to be discussed at pre - NDA meeting. CMC: chemistry, manufacturing and controls; GAD: generalized anxiety disorder; MDD: major depressive disorder; NDA: new drug app lication; ODT: oral dissolving tablet Registrational Program Completion Anticipated by YE 2026 1 Key Psychedelics Considerations x No psychotherapeutic intervention beyond study drug x Statistically significant dose - response demonstrated x Blinded central raters with assessment of blind integrity x Thorough evaluation of blinding & expectancy x Structured real world - ready assessment to determine session monitoring duration x Robust and consistent adverse event capture supports a well - characterized safety profile Four positive Phase 2 & 3 studies with complementary designs across multiple indications and control conditions Comprehensive clinical pharmacology, nonclinical and CMC programs NDA - enabling manufacturing at established commercial sites Breakthrough therapy designations in GAD & MDD with enhanced regulatory engagement Pre - NDA meeting scheduled for 4Q 2026 2 ; NDA filing anticipated in 1H 2027 4 MS1 JS2 RF3 JS4 JS5 JS6 JS7 JS8 BR9BR10 JS11 JS12 RB13 JS14 BR15

Panorama Topline Results | September 2026 33 Opportunity to Deliver Significant Impact and Value Creation 1 1. Ringeisen, H., et al. (2023). Mental and Substance Use Disorders Prevalence Study (MDPS): Findings Report, Zhou, Y,. Et al. (20 17). Nature. Comorbid generalized anxiety disorder and its association with quality of life in patients with major depressive disorder. RTI International and current U.S. Census data and internal company estimates. Veeva COMPASS Open Claims An alysis Data on File, 2017 – 2025. 2. Assuming median Spravato® surrogate pricing range; the price of DT120 ODT has not been established. GAD: generalized anxiety disorder; MDD: major depressive disorder; Rx: prescription Addressable market means potential 100,000 patient impact & $5 billion revenue opportunity per 2.5% penetration 2 50 million US Adults with GAD / MDD 26 million Diagnosed with GAD / MDD 13 million Rx Treated 4.2 million Failed by 2+ Rx Strong Patient Desire & Willingness Large & Expanding Treatment Network Payer Understanding & Intent Large & Growing Unmet Need RB1 RB2

34 Modest Adoption Yields Significant Opportunity Given Large and Growing Delivery Ecosystem Panorama Topline Results | September 2026 Significant revenue potential requires only modest uptake across an established treatment network patients per month patients per year interventional psychiatry clinics 1 patients treated Potential Gross Revenue Opportunity 2 2 24 ~4,000 100K $5B 1. Represents approximately half of estimated number of sites in the Spravato® REMS program. https://www.spravatohcp.com/find/tr eat ment - center/ 2. Assumes midpoint of surrogate pricing range for Spravato®. The price of DT120 ODT has not been established. BR1

35 Core Focus to Enable Commercial Impact & Success Panorama Topline Results | September 2026 Patient Treatment Education Access & Navigation Logistical Barrier Support Provider Access Support Reimbursement Support Referral & Treatment Coordination Site of Care Site Readiness Operational Enablement Treatment - Day Logistics We are committed to delivering the best patient and provider experience to maximize impact INTEGRATED COMMERCIAL SUPPORT MODEL Connecting patients, providers and sites of care SF1 RB2 MW3 MW4

36 Building a Psychiatry Powerhouse with Two Distinct Drivers 1 1. Timing estimates subject to clinical progress and regulatory interactions. ASD: autism spectrum disorder; ODT: orally disintegrating tablet; NDA: new drug application; TLR: topline data readout Clinical & Regulatory Execution 2028 2027 2026 Commercial Execution Value Creation Expanding Site of Care Engagement & Commercial Footprint Accelerating Scheduling & Reimbursement Optimizing Patient Care Model Positive Voyage Topline Data Initial DT402 Data in ASD 2026 Positive Panorama Topline Data NDA for DT120 ODT Ascend TLR Commercial Launch DT120 ODT Panorama Topline Results | September 2026 Positive Emerge Topline Data JS1

2026 – Recent Completed Milestones Emerge (MDD) Positive Topline Data | June 2026 Voyage (GAD) Topline Readout | August 2026 Panorama (GAD) Topline Readout | September 2026 MDD BTD | September 2026 2026 – Anticipated Milestones DT120 NDA Pre - NDA Meeting | 4Q 2026 DT402 Initial Data in ASD | 4Q 2026 2027 – Anticipated Milestones DT120 NDA Filing | 1H 2027 DT120 Commercial Day Event | 1H 2027 DT120 Ascend (MDD) Topline Readout | 2027 DT120 Haven (PTSD) Study Initiation | 2027 Panorama Topline Results | September 2026 37 Maintaining Momentum with Multiple Milestones Ahead 1. Based on the Company’s current operating plan and anticipated milestones. ASD: autism spectrum disorder; BTD: breakthrough therapy designation; GAD: generalized anxiety disorder; G&A: general & admin ist rative; MDD: major depressive disorder; NDA: new drug application; PTSD: posttraumatic stress disorder Cash, Cash Equivalents & Investments ~$1.1 b illion a s of June 30, 2026 Cash runway expected to extend into 2030 1 JS1 JS2 JS3 JS4 JS5 BR6 RB7 RB8 RB9

Q&A Session

Appendix

41 1. Bar chart shows the percentage change between the high dose and lowest dose of drug studied in each clinical trial. 2. Phase 2b study: 100 µ g vs. 25 µ g; 3. Panorama: 100 µ g vs. 50 µ g; 4. Study 3: 84 mg vs 56 mg; 5. Study 2: 3 mg vs 1 mg; 6. Study 3+4: 4 mg vs 2 mg; 7. Study 5: 20 mg vs 10 mg; 8. Study 3+4: 20 mg vs 15 mg; 9. Study 1+2: 10 mg vs 5 mg; 10. Study COMP006: 25 mg vs 10 mg; 11. Study 11: 2 - 4.5 mg vs 1 - 2 mg 12. Study 10: 3 mg vs 1.5 mg; 13. Study 302: 42 mg vs 14 mg; 14.. Study 301: 42 mg vs 28 mg; 15. Study 005: 84 mg vs 42 mg; 16 . Study 1: 90 µ g vs 60 µ g 2. The information presented in this slide is derived from multiple clinical trials, each conducted under distinct protocols and se ttings. As such, these data may not be directly comparable due to the lack of a head - to - head comparison. DT120 Program is a Rare Example of Consistent Dose - Dependent Efficacy in Psychiatry 1 Panorama Topline Results | September 2026 19% 18% 14% 9% 8% 11% 9% 2% 6% 9% - 7% - 3% 12% - 9% Higher Dose Outperforms 2 3 5 4 8 6 7 9 10 11 12 13 14 15 16 - 37% Lower Dose Outperforms % Improvement of High Dose over Low Dose in Late - Stage Studies 2 COMP360 RF1 JS2 JS3

Panorama Topline Results | September 2026 42 Clinical Outcome Assessments in GAD and MDD Montgomery - Åsberg Depression Rating Scale (MADRS) 2 Range: 0 - 60 Hamilton Anxiety Scale (HAM - A) 1 Range: 0 - 56 1. Apparent sadness 2. Reported sadness 3. Inner Tension 4. Reduced Sleep 5. Reduced Appetite 6. Concentration Difficulties 7. Lassitude 8. Inability to Feel (Anhedonia) 9. Pessimistic Thoughts 10. Suicidal Thoughts 1. Anxious mood – worry, fear 2. Tension – restlessness, inability to relax 3. Fears – of dark, strangers, being alone, etc. 4. Insomnia 5. Intellectual – concentration, memory 6. Depressed Mood 7. Somatic (muscular) – aches, twitching 8. Somatic (sensory) – tinnitus, blurred vision 9. Cardiovascular symptoms – palpitations, chest pain 10. Respiratory symptoms – shortness of breath 11. Gastrointestinal symptoms – nausea, cramps 12. Genitourinary symptoms – frequency, libido changes 13. Autonomic symptoms – dry mouth, sweating 14. Behavior during interview – fidgeting, restlessness Psychological effects 1. Source: Hamilton M.The assessment of anxiety states by rating. Br J Med Psychol 1959; 32:50 – 55. 2. Source: Montgomery, S. A., & Åsberg, M. (1979). A new depression scale designed to be sensitive to change. British Journal of Ps ychiatry, 134(4), 382 – 389. Physical effects

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dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration