Description of Organization and Summary of Significant Accounting Policies | 1. Description of Organization and Summary of Significant Accounting Policies Organization Climb Bio, Inc. (the Company), formerly known as Eliem Therapeutics, Inc. (Eliem), is a clinical-stage biotechnology company focused on developing therapeutics for patients with immune-mediated diseases. The Company's lead product candidate, budoprutug (previously referred to as TNT119), is an anti-CD19 monoclonal antibody that has demonstrated B-cell depletion and has potential to treat a broad range of B-cell mediated diseases, including primary membranous nephropathy (pMN), immune thrombocytopenia (ITP), and systemic lupus erythematosus (SLE). The Company was incorporated on October 18, 2018 in Delaware and in October 2024 relocated its corporate headquarters to Massachusetts. On June 27, 2024, the Company completed its acquisition of Tenet Medicines, Inc. (the Acquisition). In connection with the closing of the Acquisition, the Company issued and sold 31,238,282 shares of its common stock at a price of $ 3.84 per share in a private placement to several accredited institutional investors (the Private Placement). The Company received aggregate gross proceeds from the Private Placement of approximately $ 120.0 million, before deducting offering costs of $ 0.3 million . For additional information on the Acquisition and Private Placement, please refer to Note 2, Asset Acquisition and Private Placement with a Related Party , in these interim condensed consolidated financial statements. In the third quarter of 2024, the Company shifted its focus from developing therapeutics for neuronal excitability disorders to immune-mediated diseases. In connection with this shift, the Company ceased its operations in the United Kingdom (U.K.) and separated from seven U.K. employees. Basis of Presentation and Principles of Consolidation The accompanying interim condensed consolidated financial statements of the Company and its wholly owned subsidiaries have been prepared in conformity with accounting principles generally accepted in the United States (U.S. GAAP) and accordance with the rules and regulations of the U.S. Securities and Exchange Commission (SEC) for Quarterly Reports on Form 10-Q. All intercompany transactions and balances have been eliminated in consolidation. The accompanying condensed consolidated balance sheet as of September 30, 2024, and condensed consolidated statements of operations and comprehensive loss, condensed consolidated statements of cash flows, and condensed consolidated statements of stockholders’ equity for the three and nine months ended September 30, 2024 and 2023, are unaudited. The consolidated balance sheet as of December 31, 2023 was derived from the audited financial statements as of and for the year ended December 31, 2023, but does not include all disclosures required by U.S. GAAP. The unaudited interim condensed financial statements have been prepared on a basis consistent with the audited annual financial statements as of and for the year ended December 31, 2023, and, in the opinion of management, reflect all adjustments, consisting solely of normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of September 30, 2024, the condensed results of its operations as of the three and nine months ended September 30, 2024 and 2023, and its cash flows for the nine months ended September 30, 2024 and 2023. The financial data and other information disclosed in these notes related to the three and nine months ended September 30, 2024 and 2023 are also unaudited. The condensed consolidated results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results to be expected for the full year ending December 31, 2024 or any other period. These interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements included in the Company’s Annual Report on Form 10-K filed with the SEC on March 28, 2024. Liquidity Since inception, the Company has experienced recurring losses from operations and generated negative cash flows from operations. The Company has an accumulated deficit of $ 221.5 million as of September 30, 2024 and expects to incur additional losses from operations in the future. The Company received net proceeds of $ 119.7 million from the sale and issuance of shares in the Private Placement. The Company estimates the available cash, cash equivalents and marketable securities of $ 217.9 million as of September 30, 2024 will be sufficient to meet its projected operating requirements for at least the next twelve months from the filing date of these unaudited condensed consolidated financial statements and the Company anticipates that it will need to raise substantial financing in the future to fund its operations. The Company may finance future cash needs through equity offerings, debt financings, collaborations, strategic alliances and marketing, distribution or licensing arrangements. In addition, the Company may continue to rely on capital markets for funding. There are no assurances that the Company will be able to raise sufficient amounts of funding in the future on acceptable terms, or at all. Use of Estimates The preparation of the interim condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts and disclosures. Accordingly, actual results could differ from those estimates. Key management estimates include those related to the accrual of research and development expenses, recoverable research and development tax credits, and the valuation of stock-based awards. The Company evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors and adjusts those estimates and assumptions when facts and circumstances dictate. Actual results could differ from those estimates. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents, and marketable securities. The Company’s cash is held by two financial institutions in the United States (U.S.) and one financial institution in the United Kingdom (U.K.). The Company does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. The Company’s deposits held in the U.S. and U.K. may exceed the insured limits of the Federal Depository Insurance Corporation and Financial Services Compensation Scheme, respectively. As of September 30, 2024, the Company had investments in money market funds and marketable securities, which are held in segregated accounts at a third-party custodian. The Company has established guidelines relative to credit ratings and maturities intended to safeguard principal balances and maintain liquidity. Through September 30, 2024 , and the date of this filing, the Company has not experienced any losses on such investments. Risks and Uncertainties The Company is subject to risks and uncertainties common to early-stage companies in the biotechnology industry, including, but not limited to, development by competitors of new technological innovations, protection of proprietary technology, dependence on key personnel, reliance on single-source vendors and collaborators, availability of raw materials, patentability of the Company’s product candidates and processes and clinical efficacy and safety of budoprutug or any product candidate the Company may develop, compliance with government regulations and the need to obtain additional financing to fund operations. Budoprutug or any product candidate the Company may develop will require significant additional research and development efforts, including extensive preclinical studies, clinical trials, and regulatory approval, prior to commercialization. These efforts will require significant amounts of additional capital, adequate personnel infrastructure and extensive compliance and reporting. There can be no assurance that any future research and development will be successfully completed, that adequate protection for the Company’s intellectual property will be obtained or maintained, that any product candidates developed will obtain necessary government regulatory approval or that any approved products will be commercially viable. Even if the Company’s product development efforts are successful, it is uncertain when, if ever, the Company will generate revenue from product sales. The Company operates in an environment of rapid technological change and substantial competition from other pharmaceutical and biotechnology companies. In addition, the Company is dependent upon the services of its employees, consultants and other third parties . Segments Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision-maker (the CODM). The Company’s CODM is its chief executive officer who reviews financial information together with certain operating metrics principally to make decisions about how to allocate resources and to measure the Company’s performance. Management has determined that the Company operates as a single operating and reportable segment. The Company’s CODM evaluates financial information on a consolidated basis. As the Company operates as one operating segment, all required segment financial information is found in the interim condensed consolidated financial statements. Fair Value Measurement Assets and liabilities recorded at fair value on a recurring basis in the balance sheet are categorized based upon the level of judgment associated with the inputs used to measure their fair values. Fair value is defined as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The Company measures fair value based on a three-tier hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value as follows: • Level 1 —Observable inputs such as unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. • Level 2 —Inputs (other than quoted prices included in Level 1) are either directly or indirectly observable for the assets or liabilities. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. • Level 3 —Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. In determining fair value, the Company utilizes quoted market prices, or valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considers counterparty credit risk in its assessment of fair value. There were no transfers into or out of Level 3 for any of the periods presented. The Company’s fair value measurements as of September 30, 2024 and December 31, 2023 was as follows (in thousands): September 30, 2024 Level 1 Level 2 Balance Assets: Cash equivalents: Money market funds $ 139,280 $ — $ 139,280 U.S. Treasury securities 3,495 — 3,495 Total cash equivalents 142,775 — 142,775 Marketable securities: U.S. Treasury securities 30,475 — 30,475 Corporate bonds — 41,277 41,277 Total marketable securities 30,475 41,277 71,752 Total assets $ 173,250 $ 41,277 $ 214,527 December 31, 2023 Level 1 Level 2 Balance Assets: Cash equivalents: Money market funds $ 89,197 $ — $ 89,197 Marketable securities: U.S. Treasury securities 8,962 — 8,962 U.S. government agency debt securities — 4,724 4,724 Total marketable securities 8,962 4,724 13,686 Total assets $ 98,159 $ 4,724 $ 102,883 Summary of Significant Accounting Policies Asset Acquisitions In accordance with the guidance in Topic 805, Business Combinations , in the Financial Accounting Standards Board’s (the FASB) Accounting Standards Codification (ASC), the Company evaluates acquisitions of assets and related liabilities and other similar transactions to assess whether or not the transaction should be accounted for as a business combination or asset acquisition by first applying a screen test to determine if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets. If the screen test is met, the transaction is accounted for as an asset acquisition. If the screen test is not met, further determination is required as to whether or not the Company has acquired inputs and processes that have the ability to create outputs which would meet the requirements of a business. The Company accounts for an asset acquisition by recognizing net assets based on the cost to the acquiring entity on a relative fair value basis. Goodwill is not recognized in an asset acquisition; any excess consideration transferred over the fair value of the net assets acquired is allocated to the non-monetary identifiable assets and liabilities assumed based on relative fair values. In-process research and development acquired in an asset acquisition is expensed provided there is no alternative future use. The Company accounts for future payments such as those upon achievement of certain regulatory, development or sales milestones in such asset acquisitions when the underlying milestones are achieved. Milestone payments made to third parties subsequent to regulatory approval may be capitalized as intangible assets, if deemed to have alternative future use, and amortized over the estimated remaining useful life of the related product. There have been no other material revisions in the Company’s significant accounting policies described in Note 2 to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Recently Adopted Accounting Pronouncements In August 2020, the FASB issued Accounting Standards Update (ASU) No. 2020-06 (ASU 2020-06), Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging —Contracts in Entity’s Own Equity (Subtopic 815-40)—Accounting For Convertible Instruments and Contracts in an Entity’s Own Equity . The standard simplifies accounting for convertible instruments by removing major separation models required under current GAAP. Consequently, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. ASU 2020-06 removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception, which will permit more equity contracts to qualify for it. The standard also simplifies the diluted net income per share calculation in certain areas. The effective date of this update for non-public companies is for fiscal years beginning after December 15, 2023, including interim periods therein. Early adoption is permitted for fiscal years beginning after December 15, 2020 and interim periods therein. The Company adopted ASU 2020-06 on January 1, 2024, which did not have a material impact on its consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU No. 2023-07 (ASU 2023-07), Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures which requires, among other things, the following: (i) enhanced disclosures about significant segment expenses that are regularly provided to the CODM and included in a segment's reported measure of profit or loss; (ii) disclosure of the amount and description of the composition of other segment items, as defined in ASU 2023-07, by reportable segment; and (iii) reporting the disclosures about each reportable segment's profit or loss and assets on an annual and interim basis. The provisions of ASU 2023-07 are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company expects ASU 2023-07 to require additional disclosures in the notes to its consolidated financial statements which will be included in its Annual Report on Form 10-K for the fiscal year ending December 31, 2024. In December 2023, the FASB issued ASU No. 2023-09 (ASU 2023-09), Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires, among other things, the following for public business entities: (i) enhanced disclosures of specific categories of reconciling items included in the rate reconciliation, as well as additional information for any of these items meeting certain qualitative and quantitative thresholds; (ii) disclosure of the nature, effect and underlying causes of each individual reconciling item disclosed in the rate reconciliation and the judgment used in categorizing them if not otherwise evident; and (iii) enhanced disclosures for income taxes paid, which includes federal, state, and foreign taxes, as well as for individual jurisdictions over a certain quantitative threshold. The amendments in ASU 2023-09 eliminate the requirement to disclose the nature and estimate of the range of the reasonably possible change in unrecognized tax benefits for the 12 months after the balance sheet date. The effective date of this update for non-public companies is for fiscal years beginning after December 15, 2025; early adoption is permitted. The Company expects ASU 2023-09 to require additional disclosures in the notes to its consolidated financial statements. There were no other significant updates to the recently issued accounting standards other than as disclosed herewith for the nine months ended September 30, 2024. Although there are several other new accounting pronouncements issued or proposed by the FASB, the Company does not believe any of those accounting pronouncements have had or will have a material impact on its financial position or operating results. |