Form 8-K

8-K — Biomea Fusion, Inc.

Accession: 0001193125-26-183710

Filed: 2026-04-28

Period: 2026-04-27

CIK: 0001840439

SIC: 2834 (PHARMACEUTICAL PREPARATIONS)

Item: Regulation FD Disclosure

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — d142809d8k.htm (Primary)

EX-99.1 (d142809dex991.htm)

GRAPHIC (g142809ex99_1s10g1.jpg)

GRAPHIC (g142809ex99_1s11g1.jpg)

GRAPHIC (g142809ex99_1s12g1.jpg)

GRAPHIC (g142809ex99_1s13g1.jpg)

GRAPHIC (g142809ex99_1s14g1.jpg)

GRAPHIC (g142809ex99_1s15g1.jpg)

GRAPHIC (g142809ex99_1s16g1.jpg)

GRAPHIC (g142809ex99_1s17g1.jpg)

GRAPHIC (g142809ex99_1s18g1.jpg)

GRAPHIC (g142809ex99_1s19g1.jpg)

GRAPHIC (g142809ex99_1s1g1.jpg)

GRAPHIC (g142809ex99_1s20g1.jpg)

GRAPHIC (g142809ex99_1s21g1.jpg)

GRAPHIC (g142809ex99_1s22g1.jpg)

GRAPHIC (g142809ex99_1s23g1.jpg)

GRAPHIC (g142809ex99_1s24g1.jpg)

GRAPHIC (g142809ex99_1s25g1.jpg)

GRAPHIC (g142809ex99_1s26g1.jpg)

GRAPHIC (g142809ex99_1s27g1.jpg)

GRAPHIC (g142809ex99_1s2g1.jpg)

GRAPHIC (g142809ex99_1s3g1.jpg)

GRAPHIC (g142809ex99_1s4g1.jpg)

GRAPHIC (g142809ex99_1s5g1.jpg)

GRAPHIC (g142809ex99_1s6g1.jpg)

GRAPHIC (g142809ex99_1s7g1.jpg)

GRAPHIC (g142809ex99_1s8g1.jpg)

GRAPHIC (g142809ex99_1s9g1.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: d142809d8k.htm · Sequence: 1

8-K

false 0001840439 0001840439 2026-04-27 2026-04-27

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): April 27, 2026

Biomea Fusion, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware

001-40335

82-2520134

(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

1599 Industrial Road

San Carlos, CA

94070

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: (650) 980-9099

Not Applicable

(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 Stock, $0.0001 par value

BMEA

The Nasdaq Global Select Market

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 ☒

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 April 28, 2026, Biomea Fusion, Inc. (the “Company”) hosted a conference call and live webcast to discuss topline data for its Phase 2 COVALENT-112 study. The Company has made available a slide presentation to accompany the call, a copy of which is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K.

The information contained in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”), or otherwise subject to the liabilities of that section and shall not be incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 8.01.

Other Events

On April 27, 2026, the Company reported positive 52-week results from its Phase 2 COVALENT-112 trial evaluating the efficacy, safety, and tolerability of icovamenib in patients with type 1 diabetes (“T1D”).

Results

The COVALENT-112 trial demonstrated encouraging results in patients with T1D. In patients diagnosed within 0–3 years, treatment with icovamenib 200 mg once daily for 12 weeks resulted in a 52% increase in mean C-peptide area under the curve (AUC) at Week 12 (p<0.001; n=5), representing a magnitude of improvement that is not commonly reported in published studies of T1D.

Importantly, the effect was durable following only 12 weeks of dosing, mean C-peptide AUC was largely preserved through Week 52, representing approximately a 7% decline from baseline. A dose response was observed, with the 200 mg dose demonstrating greater activity compared to 100 mg. Published natural history data suggest that patients with Stage 3 T1D typically experience substantial declines in C-peptide over time, underscoring the significance of preserved C-peptide following only a 12-week dosing period.

In patients with longer-standing disease (3-15 years since diagnosis), C-peptide levels were generally preserved through Week 52 (12-week treatment period + 40-week follow-up), with only a modest decline from baseline. A comprehensive dataset will be presented at the upcoming American Diabetes Association’s (ADA) Scientific Sessions in June.

Icovamenib was generally well tolerated, with no new or unexpected safety signals identified throughout the 52-week observation period. Unlike investigational approaches in T1D that rely primarily on immune suppression or cellular transplantation, icovamenib is designed as a short course, orally administered therapy targeting beta cell biology, with effects that appear to persist beyond the treatment period.

Planned Next Steps

Based on these data, the Company, in collaboration with four U.S. academic centers, is planning a Phase 2 trial in patients with T1D diagnosed within the past 3 years. The study will evaluate whether extended dosing (up to 6 or 12 months) at 200 mg further improves C-peptide and whether the addition of an immunosuppressive agent enhances clinical outcomes. This study is planned to be initiated within the second half of this year at the Barbara Davis Center for Diabetes, Joslin Diabetes Center, UT Health San Antonio Diabetes Center, and the University of Miami Diabetes Research Institute.

Study Design

COVALENT-112 (NCT06152042) was an open-label Phase 2 trial evaluating icovamenib in adult patients with T1D. The study enrolled patients aged 18 to 60 years with Stage 3 T1D, including those diagnosed within 0–3 years with residual beta cell function at baseline, defined by a screening C-peptide level ≥0.2 nmol/L (Cohort 1), as well as a broader population with disease duration of 3–15 years and residual beta cell function at baseline, defined by a screening C-peptide level ≥0.08 nmol/L (Cohort 2). Participants were assigned to receive icovamenib at 100 mg or 200 mg once daily for 12 weeks, followed by a 40-week post-treatment follow-up to assess durability of effect. Study enrollment and dosing were interrupted in May 2024 due to an FDA clinical hold, which was subsequently resolved. As a result, these data reflect approximately half of the originally intended patient population. A planned placebo-controlled Part 2 of the study was not completed.

The primary endpoint was the mean change from baseline in stimulated C-peptide area under the curve (AUC), measured during a mixed-meal tolerance test (MMTT), to evaluate endogenous insulin secretion. Secondary endpoints included additional measures of beta cell function, glycemic control, insulin use, and safety.

Forward-Looking Statements

Statements made or incorporated by reference in this Current Report on Form 8-K may include statements which are not historical facts and are considered forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). These statements may be identified by words such as “aims,” “anticipates,” “believes,” “could,” “estimates,” “expects,” “forecasts,” “goal,” “intends,” “may,” “plans,” “possible,” “potential,” “seeks,” “will” and variations of these words or similar expressions that are intended to identify forward-looking statements. Any such statements in this Current Report that are not statements of historical fact, including statements regarding the clinical and therapeutic potential of the Company’s product candidates and development programs, including icovamenib and the potential of icovamenib as a treatment for Type 1 and Type 2 diabetes, and the Company’s expectations regarding the optimal dose and target patient population; the Company’s research, development and regulatory plans; the mechanism of action of the Company’s product candidates and development programs; the progress and initiation of the Company’s ongoing and upcoming clinical trials, including its Phase 2 COVALENT-112 trial; the anticipated availability of data from the Company’s clinical trials; the Company’s planned interactions with regulators; and the timing of such events may be deemed to be forward-looking statements. The Company intends these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act and Section 21E of the Exchange Act and is making this statement for purposes of complying with those safe harbor provisions.

Any forward-looking statements made or incorporated by reference in this Current Report on Form 8-K are based on the Company’s current expectations, estimates and projections only as of the date of this Current Report on Form 8-K and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements, including the risk that preliminary or interim results of preclinical studies or clinical trials may not be predictive of future or final results in connection with ongoing or future clinical trials and the risk that the Company may encounter delays in preclinical or clinical development, patient enrollment and in the initiation, conduct and completion of the Company’s ongoing and planned clinical trials and other research and development activities. These risks concerning the Company’s business and operations are described in additional detail in its periodic filings with the U.S. Securities and Exchange Commission (the “SEC”), including its most recent periodic report filed with the SEC and subsequent filings thereafter. The Company explicitly disclaims any obligation to update any forward-looking statements except to the extent required by law.

Item 9.01.

Financial Statements and Exhibits.

(d) Exhibits

Exhibit

Number

Description

99.1

Presentation titled “Icovamenib in Type 1 Diabetes: COVALENT-112 Topline Results,” dated April 28, 2026, furnished herewith.

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 thereunto duly authorized.

BIOMEA FUSION, INC.

Date: April 28, 2026

By:

/s/ Michael J.M. Hitchcock

Michael J.M. Hitchcock

Interim Chief Executive Officer, Director

(Principal Executive Officer)

EX-99.1

Filename: d142809dex991.htm · Sequence: 2

EX-99.1

COVALENT-112 Topline Results BIOMEA

FUSION CONFERENCE CALL 28 APRIL 2026 Icovamenib in Type 1 Diabetes Exhibit 99.1

Certain statements in this

presentation and the accompanying oral commentary are forward-looking statements. These statements relate to future events or the future business and financial performance of Biomea Fusion, Inc. (the “Company”) and involve known and

unknown risks, uncertainties, and other factors that may cause the actual results, levels of activity, performance or achievements of the Company or its industry to be materially different from those expressed or implied by any forward-looking

statements. In some cases, forward-looking statements can be identified by terminology such as “may,” “will,” “could,” “would,” “should,” “expect,” “plan,”

“anticipate,” “intend,” “believe,” “estimate,” “predict,” “potential” or other comparable terminology. All statements other than statements of historical fact could be deemed

forward-looking, including any projections of financial information or profitability, the initiation, timing and results of pending or future preclinical studies and clinical trials, the actual or potential actions of the U.S. Food and Drug

Administration (FDA), the status and timing of ongoing research, development and corporate partnering activities, any statements about historical results that may suggest trends for the Company's business; any statements of the plans, strategies,

and objectives of management for future operations and any statements of expectation or belief regarding future events, potential markets or market size, or technology developments. The Company has based these forward-looking statements on its

current expectations, assumptions, estimates, and projections. While the Company believes these expectations, assumptions, estimates and projections are reasonable, such forward-looking statements are only predictions and involve known and unknown

risks and uncertainties, many of which are beyond the Company's control. For a discussion of these and other risks and uncertainties, and other important factors, any of which could cause our actual results to differ from those contained in the

forward-looking statements, see the section entitled "Risk Factors" in our most recent annual report on Form 10-K filed with the Securities and Exchange Commission (the SEC), as well as discussions of potential risks, uncertainties, and other

important factors in our other subsequent filings with the SEC. The forward-looking statements in this presentation are made only as of the date hereof. Except as required by law, the Company assumes no obligation and does not intend to update these

forward-looking statements or to conform these statements to actual results or to changes in the Company's expectations. This presentation also contains estimates and other statistical data made by independent parties and by us relating to market

size and growth and other data about our industry. This data involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. In addition, projections, assumptions, and estimates of our future

performance and the future performance of the markets in which we operate are necessarily subject to a high degree of uncertainty and risk. Legal disclaimer & forward-looking statements

Type 1 Diabetes and Market Preclinical

Validation Investigational Therapies Exploring T1D COVALENT-112 Study Design Cohort 1 (0-3 Years Since Diagnosis) Summary Next T1D Study Planned with Icovamenib (Barbara Davis Center for Diabetes, Joslin Diabetes Center, UT Health San Antonio

Diabetes Center and the University of Miami Diabetes Research Institute) Final Remarks Table of contents

Type 1 diabetes at-a-glance ~9.5M

~513K People live with T1D globally in 20251 New diagnoses per year globally in 20251 ~1.8M in the US2 ~64K new diagnoses/year in the US3 T1D is caused by autoimmune destruction of insulin-producing pancreatic islet beta cells T1D is considered

a lifelong chronic disease and carries substantial acute risk (severe hypoglycemia, DKA) as well as long-term complications including kidney disease, nerve damage, vision loss, and cardiovascular issues4 Patients with symptomatic T1D (Stage 3)

typically lose yearly ~50% of their beta cell capacity over the first 7 years5 There are no approved therapies other than exogenous insulin that address the dysglycemia associated with the progressive decline of C-peptide in Stage 3 T1D 6 Ogle, et

al. Diabetes Research and Clinical Practice 2025, 225, 112277 Centers for Disease Control and Prevention. National Diabetes Statistics Report, 2023 Mayer-Davis et al., NEJM / CDC updates American Diabetes Association. Standards of Care in

Diabetes—2025 Diabetes Care. 2018 Jun 7;41(7):1486–1492 Front. Endocrinol., 05 November 2024

T1D Disease and Market Preclinical

Diabetes Center and the University of Miami Diabetes Research Institute) Final Remarks Table of Contents

Physiologic evidence Natural states

such as pregnancy and lactation reduce menin, enabling beta cell expansion and increased insulin output Preclinical and translational validation Across animal models and human islet studies, reduced menin is consistently linked to improved beta-cell

mass and function Icovamenib MOA Icovamenib reduced menin levels to replicate a validated biological process and restore beta cell function Karnik SK, et al. Science. 2007;318:806-809 Lowering menin is a natural biological process that drives beta

cell expansion and is expected to reduce diabetes risk

ORAL GLUCOSE TOLERANCE TEST (DAY 17)

Icovamenib significantly reduced blood glucose in STZ rats (a model in which only insulin decreases blood glucose levels) STZ TREATMENT TYPICALLY RESULTS IN ~50% BETA CELL LOSS Icovamenib (175mg/kg) (insulin desensitizer) (menin

inhibitor) STZ=Streptozotocin, an antibiotic that produces pancreatic islet beta cell destruction and is widely used experimentally to produce a model in diabetes Butler, eta al. Diabetologia 65 (Suppl 1), 1–469 (2022) presentation

#197

Icovamenib decreased menin protein

levels & promoted beta cell proliferation in ex vivo human islet cultures MENIN LEVELS DECREASED ICOVAMENIB CONDITIONALLY PROMOTED BETA CELL PROLIFERATION ONLY UNDER HYPERGLYCEMIC CONDITIONS Standard Glucose (5.5 mM) High Glucose (8 mM) Frias,

et al. Metabolism,Vol153, Supplement,2023,#88 Somanath, et al. Diabetologia 68 (Suppl 1), 1–754 (2025). Oral presentation #66

Preclinical Validation T1D Disease and

Market Investigational Therapies Exploring T1D COVALENT-112 Study Design Cohort 1 (0-3 Years Since Diagnosis) Summary Next T1D Study Planned with Icovamenib (Barbara Davis Center for Diabetes, Joslin Diabetes Center, UT Health San Antonio Diabetes

Center and the University of Miami Diabetes Research Institute) Final Remarks Table of contents

Treatment Landscape: Limitations of

current approaches in stage 3 T1D Most investigational therapies in T1D focus on immune modulation to slow autoimmune destruction or on preserving residual beta cell function1 C-peptide area under the curve (AUC) has become the accepted endpoint,

driving enrollment early after diagnosis (<90 days, new-onset T1D) to preserve residual beta-cell function2 To date, most investigational therapies have not demonstrated durable restoration of beta cell function or sustained increases in

C-peptide, outside of cell-based transplantation approaches3 The Next Frontier: Restoring beta cell function and mass, beyond only slowing the decline of C-peptide Expanding the treatment window beyond early, new onset T1D populations Enabling

persistence of newly generated beta cells despite autoimmune pressure Zarei M et al. Diabetes Epidemiology and Management 2025;17 Diabetes Care 2025 NIDDK. Diabetes in America, 2024

DRUG Mean C-PEPTIDE AUC VS PLACEBO

Ustekinumab ATG (TrialNet) MELD-ATG Most therapies in development for stage 3 T1D show limited and non-durable C-peptide impact *Ladarixin and Diamyd, both Immune modulating, not mentioned here as they demonstrated no meaningful difference compared

to placebo Nature Medicine 2024 vol 30, 2657–2666 Diabetes Care 2018 Jul 16;41(9):1917–1925 DRUG Mean C-PEPTIDE AUC VS PLACEBO Teplizumab (Tzield) Baricitinib SAB-142 SAB Bio website corporate presentation (March 10, 2026)

https://www.sab.bio/ ESPE Yearbook of Paediatric Endocrinology (2024) 21 10.2 N Engl J Med 2023;389:2140-2150 DRUG Mean C-PEPTIDE AUC VS PLACEBO Verapamil Rituximab NEJM. 2009 361:2143–2152 Nature. 2018 Aug;24(8):1108-1112

Lancet 2025 Sep 27;406(10510):1375-1388

T1D Disease and Market Preclinical

Diabetes Center and the University of Miami Diabetes Research Institute) Final Remarks Table of contents

COVALENT-112 (NCT06152042) was a

Phase 2 trial designed to examine beta cell function (as measured by C-peptide change and the change of exogenous insulin usage) and glucose and lipid metabolism in participants with T1D treated with standard of care insulin and icovamenib.

SCREENING: 5 WEEKS DOSING PERIOD: 12 WEEKS Icovamenib 200 mg QD Icovamenib 100 mg QD ARM A N = 10 ARM B N = 10 COVALENT-112 | Study Design FOLLOW-UP: 40 WEEKS ARM A N = 10 ARM B N = 10 Cohort 1 T1D diagnosed within 3 years with a C-peptide

≥0.2 nmol/L Cohort 2 T1D diagnosed between 3-15 years with a C-peptide ≥0.08 nmol/L Study enrollment and dosing were interrupted in May 2024 due to an FDA clinical hold, which was subsequently resolved, but reduced the number of patients

enrolled and followed through to the 52-week readout. Icovamenib 200 mg QD Icovamenib 100 mg QD

52% mean increase from baseline 12

WEEKS TREATMENT 52% mean increase in C-peptide during the 12 weeks treatment period of icovamenib Readout at Week 12 Data represents post-hoc analysis of patients who received per statistical analysis plan, 80% of planned doses 1 Historical control

in T1D patients (n=1549) C-peptide declining over first 7 years at 47% yearly. Diabetes Care. 2018 Jun 7;41(7):1486–1492 * 4-hour Mixed Meal Tolerance Test (MMTT) 1.21 +0.7 P<0.001 (n=5) (n=3) (n=5) (n=6) Cohort 1 (< 3 years since

diagnosis) Historical Control1

-7% -32% 12 WEEKS TREATMENT Data

represents post-hoc analysis of patients who received per statistical analysis plan, 80% of planned doses 1 Historical control in T1D patients (n=1549) C-peptide declining over first 7 years at 47% yearly. Diabetes Care. 2018 Jun

7;41(7):1486–1492 * 4-hour Mixed Meal Tolerance Test (MMTT) -47%1 Readout at week 52 Baseline C-peptide levels sustained through week 52 with minimal decline (only -7.1%) observed post 12 weeks of 200mg daily icovamenib 40 WEEKS OFF TREATMENT

(n=4) (n=5) Change in mean C-peptide AUC at Week 52 vs baseline (n=6) (n=5) Demographics (means) | n=6 Age: 28 years Sex: 67% female BMI: 25 kg/m2 Disease course: 2.4y HbA1c: 7.4% Fasting Plasma Glucose: 178 mg/dL Fasting C-Peptide: 0.7 ng/mL

Demographics (means) | n=5 Age: 31 years Sex: 40% female BMI: 24 kg/m2 Disease course: 2.1y HbA1c: 8.3% Fasting Plasma Glucose: 155 mg/dL Fasting C-Peptide: 0.8 ng/mL Cohort 1 (< 3 years since diagnosis)

Topline results of icovamenib

demonstrated marked C-peptide increase in T1D with observed persistence Observed 52% increase in mean C-peptide AUC at Week 12 (p < 0.001) in Cohort 1 patients dosed at 200 mg (diagnosed within 0–3 years; n=5), a magnitude of improvement

not commonly reported in published T1D studies Mean C-peptide AUC remained largely preserved through Week 52 in Cohort 1 patients dosed at 200 mg (~7% decline from baseline), supporting persistence of effect. Patients dosed in Cohort 2 demonstrated

stable AUC during and post dosing. Generally well-tolerated, with a favorable safety profile throughout the 52-week observation period Validation of menin as a target for diabetes (T1D & T2D) further supported by these results Presentation at

American Diabetes Association’s (ADA) Scientific Session, comprehensive dataset of Cohort 1 and Cohort 2 to be presented (full release on June 5th at 6:30 pm CST)

T1D Disease and Market Preclinical

Diabetes Center and the University of Miami Diabetes Research Institute) Final Remarks Table of contents

T1D insights: Dose response: 200 mg

demonstrated stronger clinical activity vs 100 mg Potential early intervention advantage: T1D patients dosed ≤3 years showed greater response vs those 3-15 years from diagnosis 12-week treatment showed continuous and improved responses,

supporting potential for greater benefit with extended dosing Preclinical chronic toxicology studies support longer term dosing Generally well-tolerated, with a favorable safety profile maintained through the 52-week observation period Optimal dose

and target population identified for T1D phase 2 program ICOVAMENIB T1D development focus: Potential to further increase C-peptide AUC in T1D with extended or continuous dosing Opportunity to potentially enhance outcomes through combination with

immunomodulation therapies

Immune Suppressant (JAK inhibitor)

6 Months Primary endpoint C-peptide AUC Off Therapy Icovamenib 100>>>200 mg QD (n=32) Placebo (n=8) 15 Months Secondary endpoint C-peptide AUC Month 0 Month 3 Month 6 Month 9 Month 12 Month 15 icovamenib 200 mg QD (n=8) (n=8) (n=8) (n=8)

Icovamenib + Immune Suppressant (JAK inhibitor) Icovamenib 200 mg QD (n=8) SCREENING: XX DAYS TREATMENT: 6 MONTHS UNBLINDED/FOLLOW UP: ADD 6 MONTHS UNBLINDED/FOLLOW UP: ADD 3 MONTHS Active (n=32) Placebo (n=8) Proposed phase 2 trial design*

Inclusion Criteria Adult participants with T1D diagnosed within 3 years with a C-peptide ≥0.2 nmol/L Background therapy maintained unless rescue required 12 Months Secondary endpoint C-peptide AUC *Subject to regulatory and investigator

alignment, and feedback from applicable health authorities.

T1D Disease and Market Preclinical

Diabetes Center and the University of Miami Diabetes Research Institute) Final Remarks Table of Contents

Thank you (NASDAQ: BMEA)) For

questions or inquiries, please reach out to Meichiel Weiss at ir@biomeafusion.com www.biomeafusion.com

Exhibits

G. Alexander “Zan”

Fleming, MD FOUNDER & EXECUTIVE CHAIRMAN, KINEXUM FORMER FDA SENIOR MEDICAL OFFICER AND DIVISION LEADER FOR METABOLIC & ENDOCRINE DRUGS, INVOLVED IN THE REVIEW OF LANDMARK DIABETES AND METABOLIC THERAPIES INCLUDING METFORMIN, THE FIRST

RAPID-ACTING INSULIN ANALOGS, EARLY STATINS, AND PPAR AGONISTS Efforts to intervene against type 1 diabetes (T1D) have historically focused on preserving remaining insulin secretion in people just diagnosed with T1D. These icovamenib data are unique

in showing increased C-peptide-reflected insulin secretion in patients with established T1D during dosing and persistence of this effect after treatment was stopped. In people with established T1D, endogenous insulin secretion progressively declines

to very low levels. Any evidence of improvement in endogenous insulin secretion—even among a few T1D individuals—is unprecedented and of immense biologic and clinical significance. These findings warrant rigorous and longer-term

evaluation. KOL perspectives across clinical significance, biology, and future development in T1D The new data presented today with icovamenib in patients with type 1 diabetes suggest a potential new therapeutic avenue in a disease where fundamental

unmet need has long persisted. To date, approved therapies have not directly addressed the progressive loss of functional beta cells that underlies diabetes. Biomea has made critical progress in identifying and characterizing this molecule, which

has demonstrated the ability to reduce menin protein levels and activate pathways associated with beta cell function. Today's icovamenib type 1 data further validates and deepens our understanding of icovamenib's mechanism of action. Congratulations

to the Biomea team on reaching this important therapeutic milestone. What stands out to me in the icovamenib diabetes data is not only the emerging signal of biological activity, but also the safety profile observed to date with using icovamenib in

diabetes studies. That combination is important, because safety ultimately determines whether rational combination strategies can be explored as the program moves forward. Looking ahead, future studies will be critical in determining whether the

improvements observed in beta cell function of these Type 1 diabetes patients can be maintained over time, particularly in the presence of ongoing immune activity. It will also be important to understand whether combination

approaches—including immunomodulatory therapies— are needed and can further enhance or stabilize the observed effects. These are key questions that will inform the long term clinical potential of this approach. Rohit Kulkarni, MD, PhD

PROFESSOR OF MEDICINE, HARVARD MEDICAL SCHOOL | SENIOR INVESTIGATOR & SECTION CO-HEAD (ISLET CELL & REGENERATIVE BIOLOGY), JOSLIN DIABETES CENTER David Baidal, MD ASSISTANT PROFESSOR DIABETES RESEARCH INSTITUTE, UNIVERSITY OF MIAMI MILLER

SCHOOL OF MEDICINE

The icovamenib data in Type 1

diabetes naturally makes us pause and reflect on what it could ultimately mean for people living with Type 1 diabetes. While these early findings require confirmation, they suggest a different way of thinking about treatment, one that extends beyond

glucose management and begins to engage underlying disease biology. For younger individuals in particular, the possibility of preserving or improving endogenous beta cell function over time could have meaningful implications for lifelong disease

burden. Results like these invite consideration of how the treatment landscape in Type 1 diabetes may evolve if such approaches prove durable and safe. KOL perspectives across clinical significance, biology, and future development in T1D The

icovamenib data in type 1 diabetes are encouraging, this is particularly interesting as icovamenib targets a pathway that has not been meaningfully explored in this disease. Despite advances in insulin delivery and glucose monitoring,

disease-modifying options remain limited for patients. These findings support the need for focused, proof-of-concept studies in well-characterized patient populations to better understand this signal, its durability, and the underlying biology. An

important next step will be examining the interplay between beta cell effects and the autoimmunity inherent in type 1 diabetes, and whether combination approaches with immunomodulatory therapies could further enhance or stabilize these beta cell

effects. Jason Gaglia, MD, MMSc ASSISTANT PROFESSOR OF MEDICINE, HARVARD MEDICAL SCHOOL | STAFF PHYSICIAN, JOSLIN DIABETES CENTER — ONE OF THE WORLD'S LEADING DIABETES CENTERS Alice Cheng, M.D. ENDOCRINOLOGIST, ASSOCIATE PROFESSOR OF MEDICINE

UNIVERSITY OF TORONTO

DRUG MOA ROUTE & DOSING N AGE

(YRS) TIME SINCE TID DX PHASE C-PEPTIDE AUC (~WEEK 52) SAFETY C-PEPTIDE AUC VS PLACEBO Verapamil Beta cell protection Oral daily 88 7–17 ≤31 days 2 ~30–35% less decline vs placebo (inferred; near-stable vs decline) Well-tolerated

Rituximab Anti-CD20 monoclonal antibody; B-cell depletion IV, 4 weekly infusions 87 8–40 ≤100 days 2 ~20–25% preservation vs placebo Mainly infusion-related AEs; broader class risks include infection and late neutropenia Type 1

diabetes (stage 3) therapies in development - beta cell protection NEJM. 2009 361:2143–2152 Nature. 2018 Aug;24(8):1108-1112

DRUG MOA ROUTE & DOSING N AGE

(YRS) TIME SINCE T1D DX PHASE C-PEPTIDE AUC (~WEEK 52) SAFETY C-PEPTIDE AUC VS PLACEBO Teplizumab (Tzield) Anti-CD3 IV (12d × 2 cycles) 328 8–17 ≤6 weeks 3 ~59% less decline vs placebo (Week 78 proxy) CRS, lymphopenia-rash

Baricitinib JAK1/2 inhibitor Oral dail 91 Adult ≤100 days 2 ~40–50% less decline vs placebo (inferred from 0.65 vs 0.43) Chronic immuno-suppression risk SAB-142 Human anti-thymocyte Ig IV (2-day + 6 mo) 4 5–40 3.3 years 2b ~13%

C-peptide increase vs baseline at ~120 days Favorable safety Type 1 diabetes (stage 3) therapies in development - immunomodulation / suppression SAB Bio website corporate presentation (March 10, 2026) https://www.sab.bio/ ESPE Yearbook of Paediatric

Endocrinology (2024) 21 10.2 N Engl J Med 2023;389:2140-2150

DRUG MOA ROUTE & DOSING N AGE

(YRS) TIME SINCE T1D DX PHASE C-PEPTIDE AUC (~WEEK 52) SAFETY C-PEPTIDE AUC VS PLACEBO Ustekinumab IL-12/23 SC (1x every 12 weeks) 72 12–18 ≤100 days 2 ~30–40% less decline vs placebo Well-tolerated ATG (TrialNet) T-cell depletion

IV (1x over 2 days) 89 12–45 ≤100 days 2 ~50–60% less decline vs placebo CRS, serum sickness MELD-ATG Optimized ATG IV (1x over 2 day) 114-117 5–25 ≤100 days 2 ~25–35% less decline vs placebo CRS, serum sickness

Type 1 diabetes (stage 3) therapies in development - immunomodulation / suppression *Ladarixin and Diamyd, both Immune modulating, not mentioned here as they demonstrated no meaningful difference compared to placebo Lancet 2025 Sep

27;406(10510):1375-1388 Nature Medicine 2024 vol 30, 2657–2666 Diabetes Care 2018 Jul 16;41(9):1917–1925

GRAPHIC

Filename: g142809ex99_1s10g1.jpg · Sequence: 6

Binary file (105106 bytes)

Download g142809ex99_1s10g1.jpg

GRAPHIC

Filename: g142809ex99_1s11g1.jpg · Sequence: 7

Binary file (105371 bytes)

Download g142809ex99_1s11g1.jpg

GRAPHIC

Filename: g142809ex99_1s12g1.jpg · Sequence: 8

Binary file (70645 bytes)

Download g142809ex99_1s12g1.jpg

GRAPHIC

Filename: g142809ex99_1s13g1.jpg · Sequence: 9

Binary file (88221 bytes)

Download g142809ex99_1s13g1.jpg

GRAPHIC

Filename: g142809ex99_1s14g1.jpg · Sequence: 10

Binary file (78034 bytes)

Download g142809ex99_1s14g1.jpg

GRAPHIC

Filename: g142809ex99_1s15g1.jpg · Sequence: 11

Binary file (97012 bytes)

Download g142809ex99_1s15g1.jpg

GRAPHIC

Filename: g142809ex99_1s16g1.jpg · Sequence: 12

Binary file (116936 bytes)

Download g142809ex99_1s16g1.jpg

GRAPHIC

Filename: g142809ex99_1s17g1.jpg · Sequence: 13

Binary file (71816 bytes)

Download g142809ex99_1s17g1.jpg

GRAPHIC

Filename: g142809ex99_1s18g1.jpg · Sequence: 14

Binary file (85373 bytes)

Download g142809ex99_1s18g1.jpg

GRAPHIC

Filename: g142809ex99_1s19g1.jpg · Sequence: 15

Binary file (76086 bytes)

Download g142809ex99_1s19g1.jpg

GRAPHIC

Filename: g142809ex99_1s1g1.jpg · Sequence: 16

Binary file (41590 bytes)

Download g142809ex99_1s1g1.jpg

GRAPHIC

Filename: g142809ex99_1s20g1.jpg · Sequence: 17

Binary file (70114 bytes)

Download g142809ex99_1s20g1.jpg

GRAPHIC

Filename: g142809ex99_1s21g1.jpg · Sequence: 18

Binary file (40467 bytes)

Download g142809ex99_1s21g1.jpg

GRAPHIC

Filename: g142809ex99_1s22g1.jpg · Sequence: 19

Binary file (19642 bytes)

Download g142809ex99_1s22g1.jpg

GRAPHIC

Filename: g142809ex99_1s23g1.jpg · Sequence: 20

Binary file (159486 bytes)

Download g142809ex99_1s23g1.jpg

GRAPHIC

Filename: g142809ex99_1s24g1.jpg · Sequence: 21

Binary file (106346 bytes)

Download g142809ex99_1s24g1.jpg

GRAPHIC

Filename: g142809ex99_1s25g1.jpg · Sequence: 22

Binary file (76885 bytes)

Download g142809ex99_1s25g1.jpg

GRAPHIC

Filename: g142809ex99_1s26g1.jpg · Sequence: 23

Binary file (90369 bytes)

Download g142809ex99_1s26g1.jpg

GRAPHIC

Filename: g142809ex99_1s27g1.jpg · Sequence: 24

Binary file (90781 bytes)

Download g142809ex99_1s27g1.jpg

GRAPHIC

Filename: g142809ex99_1s2g1.jpg · Sequence: 25

Binary file (205873 bytes)

Download g142809ex99_1s2g1.jpg

GRAPHIC

Filename: g142809ex99_1s3g1.jpg · Sequence: 26

Binary file (68399 bytes)

Download g142809ex99_1s3g1.jpg

GRAPHIC

Filename: g142809ex99_1s4g1.jpg · Sequence: 27

Binary file (102760 bytes)

Download g142809ex99_1s4g1.jpg

GRAPHIC

Filename: g142809ex99_1s5g1.jpg · Sequence: 28

Binary file (70440 bytes)

Download g142809ex99_1s5g1.jpg

GRAPHIC

Filename: g142809ex99_1s6g1.jpg · Sequence: 29

Binary file (99308 bytes)

Download g142809ex99_1s6g1.jpg

GRAPHIC

Filename: g142809ex99_1s7g1.jpg · Sequence: 30

Binary file (95003 bytes)

Download g142809ex99_1s7g1.jpg

GRAPHIC

Filename: g142809ex99_1s8g1.jpg · Sequence: 31

Binary file (102565 bytes)

Download g142809ex99_1s8g1.jpg

GRAPHIC

Filename: g142809ex99_1s9g1.jpg · Sequence: 32

Binary file (70404 bytes)

Download g142809ex99_1s9g1.jpg

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 34

v3.26.1

Document and Entity Information

Apr. 27, 2026

Cover [Abstract]

Amendment Flag

false

Entity Central Index Key

0001840439

Document Type

8-K

Document Period End Date

Apr. 27, 2026

Entity Registrant Name

Biomea Fusion, Inc.

Entity Incorporation State Country Code

Entity File Number

001-40335

Entity Tax Identification Number

82-2520134

Entity Address, Address Line One

1599 Industrial Road

Entity Address, City or Town

San Carlos

Entity Address, State or Province

Entity Address, Postal Zip Code

94070

City Area Code

(650)

Local Phone Number

980-9099

Written Communications

false

Soliciting Material

false

Pre Commencement Tender Offer

false

Pre Commencement Issuer Tender Offer

false

Security 12b Title

Common Stock, $0.0001 par value

Trading Symbol

BMEA

Security Exchange Name

NASDAQ

Entity Emerging Growth Company

true

Entity Ex Transition Period

false

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

dei_CoverAbstract

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ 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_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ 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_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.

+ References

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

-Publisher SEC

-Name Securities Act

-Number 7A

-Section B

-Subsection 2

+ Details

Name:

dei_EntityExTransitionPeriod

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration

- 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:

Period Type:

duration