Organization	9 Months Ended
Sep. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	Note 1. Organization Organization Biomea Fusion, Inc., (the “Company”), was established in the state of Delaware in August 2017 as Biomea Fusion, LLC. In December 2020, all outstanding membership interests in Biomea Fusion, LLC were converted into equity interests in the Company. The capitalization information included in these financial statements is consistently presented as if it is that of Biomea Fusion, Inc., even during the prior period when investors held their equity interests in Biomea Fusion, LLC. The Company is a biopharmaceutical company focused on the discovery and development of irreversible small molecules to treat patients with genetically defined cancers. Since its inception in 2017, the Company has built its proprietary FUSION System platform to design and develop a pipeline of novel irreversible therapies. Basis of Presentation The accompanying interim condensed financial statements as of September 30, 2021 and for the three and nine months ended September 30, 2021, and the related interim information contained within the notes to the financial statements, are unaudited. The unaudited interim condensed financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial information and on the same basis as the audited financial statements included on the Company’s annual financial statements filed with the Securities and Exchange Commission (“SEC”) within the Company’s Prospectus dated April 15, 2021 (the “Prospectus”). In the opinion of management, the accompanying unaudited interim condensed financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to state fairly the Company’s financial position as of September 30, 2021, and the results of its operations and cash flows for the three and nine months ended September 30, 2021. All such adjustments are of a normal and recurring nature. The interim financial data as of September 30, 2021 is not necessarily indicative of the results to be expected for the year ending December 31, 2021, or for any future period. The accompanying condensed financial statements and related financial information should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2020. Forward Stock Split In April 2021, the Company’s board of directors approved an amended and restated certificate of incorporation to effect a split of shares of the Company’s outstanding capital at a ratio of 8.84-for-1 (the “Forward Stock Split”) effective as of April 12, 2021. The number of authorized shares and the par values of the common stock and convertible preferred stock were not adjusted as a result of the Forward Stock Split. All references to common stock, options to purchase common stock, convertible preferred stock, share data, per share data and related information contained in the financial statements have been retrospectively adjusted to reflect the effect of the Forward Stock Split for all periods presented. Initial Public Offering On April 16, 2021, the Company’s registration statement on Form S-1 (File No. 333-254793) relating to its initial public offering (“IPO”) of common stock became effective. The IPO closed on April 20, 2021 at which time the Company issued an aggregate of 9,000,000 shares of its common stock at a price of $17.00 per share. Subsequent to the close, an additional 823,532 shares were issued in connection with the partial exercise by the underwriters of their option to purchase additional shares of common stock. In addition, immediately prior to the closing of the IPO, all outstanding shares of the Company’s convertible preferred stock automatically converted into 7,064,925 shares of common stock. In connection with the completion of its IPO, on April 20, 2021, the Company’s certificate of incorporation was amended and restated to provide for 300,000,000 authorized shares of common stock with a par value of $0.0001 per share and 10,000,000 authorized shares of preferred stock with a par value of $0.0001 per share. Proceeds from the IPO, net of underwriting discounts and commissions and offering costs, were approximately $152.8 million. Liquidity and Capital Resources The Company has incurred net operating losses and negative cash flows from operations since its inception and had an accumulated deficit of $35.0 million at September 30, 2021. As of September 30, 2021, the Company had cash, cash equivalents, restricted cash, and investments of $191.9 million. To date, none of the Company’s product candidates have been approved for sale, and the Company has not generated any revenue since inception. Management expects operating losses to continue and increase for the foreseeable future, as the Company progresses into clinical development activities for its lead product candidate. The Company’s prospects are subject to risks, expenses and uncertainties frequently encountered by companies in the biotechnology industry as discussed below. While the Company has been able to raise multiple rounds of financing, there can be no assurance that in the event the Company requires additional financing, such financing will be available on terms which are favorable or at all. Failure to generate sufficient cash flows from operations, raise additional capital or reduce certain discretionary spending would have a material adverse effect on the Company’s ability to achieve its intended business objectives.

Organization

9 Months Ended

Sep. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Note 1. Organization

Organization

Biomea Fusion, Inc., (the “Company”), was established in the state of Delaware in August 2017 as Biomea Fusion, LLC. In December 2020, all outstanding membership interests in Biomea Fusion, LLC were converted into equity interests in the Company. The capitalization information included in these financial statements is consistently presented as if it is that of Biomea Fusion, Inc., even during the prior period when investors held their equity interests in Biomea Fusion, LLC.

The Company is a biopharmaceutical company focused on the discovery and development of irreversible small molecules to treat patients with genetically defined cancers. Since its inception in 2017, the Company has built its proprietary FUSION System platform to design and develop a pipeline of novel irreversible therapies.

Basis of Presentation

The accompanying interim condensed financial statements as of September 30, 2021 and for the three and nine months ended September 30, 2021, and the related interim information contained within the notes to the financial statements, are unaudited. The unaudited interim condensed financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial information and on the same basis as the audited financial statements included on the Company’s annual financial statements filed with the Securities and Exchange Commission (“SEC”) within the Company’s Prospectus dated April 15, 2021 (the “Prospectus”). In the opinion of management, the accompanying unaudited interim condensed financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to state fairly the Company’s financial position as of September 30, 2021, and the results of its operations and cash flows for the three and nine months ended September 30, 2021. All such adjustments are of a normal and recurring nature. The interim financial data as of September 30, 2021 is not necessarily indicative of the results to be expected for the year ending December 31, 2021, or for any future period.

The accompanying condensed financial statements and related financial information should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2020.

Forward Stock Split

In April 2021, the Company’s board of directors approved an amended and restated certificate of incorporation to effect a split of shares of the Company’s outstanding capital at a ratio of 8.84-for-1 (the “Forward Stock Split”) effective as of April 12, 2021. The number of authorized shares and the par values of the common stock and convertible preferred stock were not adjusted as a result of the Forward Stock Split. All references to common stock, options to purchase common stock, convertible preferred stock, share data, per share data and related information contained in the financial statements have been retrospectively adjusted to reflect the effect of the Forward Stock Split for all periods presented.

Initial Public Offering

On April 16, 2021, the Company’s registration statement on Form S-1 (File No. 333-254793) relating to its initial public offering (“IPO”) of common stock became effective. The IPO closed on April 20, 2021 at which time the Company issued an aggregate of 9,000,000 shares of its common stock at a price of $17.00 per share. Subsequent to the close, an additional 823,532 shares were issued in connection with the partial exercise by the underwriters of their option to purchase additional shares of common stock. In addition, immediately prior to the closing of the IPO, all outstanding shares of the Company’s convertible preferred stock automatically converted into 7,064,925 shares of common stock. In connection with the completion of its IPO, on April 20, 2021, the Company’s certificate of incorporation was amended and restated to provide for 300,000,000 authorized shares of common stock with a par value of $0.0001 per share and 10,000,000 authorized shares of preferred stock with a par value of $0.0001 per share. Proceeds from the IPO, net of underwriting discounts and commissions and offering costs, were approximately $152.8 million.

Liquidity and Capital Resources

The Company has incurred net operating losses and negative cash flows from operations since its inception and had an accumulated deficit of $35.0 million at September 30, 2021. As of September 30, 2021, the Company had cash, cash equivalents, restricted cash, and investments of $191.9 million. To date, none of the Company’s product candidates have been approved for sale, and the Company has not generated any revenue since inception. Management expects operating losses to continue and increase for the foreseeable future, as the Company progresses into clinical

development activities for its lead product candidate. The Company’s prospects are subject to risks, expenses and uncertainties frequently encountered by companies in the biotechnology industry as discussed below. While the Company has been able to raise multiple rounds of financing, there can be no assurance that in the event the Company requires additional financing, such financing will be available on terms which are favorable or at all. Failure to generate sufficient cash flows from operations, raise additional capital or reduce certain discretionary spending would have a material adverse effect on the Company’s ability to achieve its intended business objectives.