Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2024

Summary of Significant Accounting Policies

Our significant accounting policies are described in Note 2, "Summary of Significant Accounting Policies" to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2023 (the "2023 Form 10-K"). Updates to our accounting policies are discussed below in this Note 2.

Unaudited Interim Condensed Consolidated Financial Information

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information. The accompanying unaudited condensed consolidated financial statements do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. The accompanying year-end condensed consolidated balance sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of June 30, 2024, the results of its operations for the three and six months ended June 30, 2024 and 2023, and its cash flows for the six months ended June 30, 2024 and 2023. The results for the three and six months ended June 30, 2024 are not necessarily indicative of results to be expected for

the year ending December 31, 2024, any other interim periods or any future year or period. The financial information included herein should be read in conjunction with the financial statements and notes in the Company's Annual Report on Form 10-K for the year ended December 31, 2023.

Reclassifications

Certain items in the prior period’s condensed consolidated financial statements have been reclassified to conform to the current year presentation.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, the accrual for research and development expenses and valuation of forward contract and derivative liabilities. In addition, management’s assessment of the Company’s ability to continue as a going concern involves the estimation of the amount and timing of future cash inflows and outflows. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates.

Restricted Cash

Restricted cash included in other current assets in the condensed consolidated balance sheets consists primarily of employee contributions to the Company's employee share purchase plan held for future purchases of the Company's outstanding shares.

Restricted cash included in other non-current assets in the condensed consolidated balance sheets represents collateral held by banks for a letter of credit ("LOC") issued in connection with the leased office space in Yardley, Pennsylvania and LOCs issued in connection with the leased office and lab spaces in Cambridge, Massachusetts and Pittsburgh, Pennsylvania. See Note 11, ‘‘Commitments and Contingencies’’ for additional information on the real estate leases.

The following represents a reconciliation of cash and cash equivalents in the condensed consolidated balance sheets to total cash, cash equivalents and restricted cash as of June 30, 2024 and June 30, 2023, respectively, in the condensed consolidated statements of cash flows:


	As of June 30, 2024		As of June 30, 2023
Cash and cash equivalents	$	239,147	$	147,612
Restricted cash held on behalf of Former Parent	—		40,415
Restricted cash (included in other current assets)	156		11,574
Restricted cash (included in other non-current assets)	3,015		2,349
Total cash, cash equivalents and restricted cash at the end of the period in the condensed consolidated statement of cash flows	$	242,318	$	201,950

Forward Contracts and Derivative Liabilities

The Company evaluates certain of its financial and business development transactions to determine the accounting classification of equity linked instruments issued in those transactions. The Company first assesses whether a freestanding equity linked instrument meets liability classification in accordance with ASC 480-10 Distinguishing Liabilities from Equity and ASC 815-40 Derivatives and Hedging - Contracts in Entity's Own Equity. Under ASC 480-10 an instrument is considered liability classified if the instrument is mandatorily redeemable, obligate the issuer to settle an instrument or the underlying shares by paying cash or other assets, or must or may require settlement by issuing variable number of shares.

If an instrument does not meet liability classification under ASC 480-10, the Company assesses the requirements under ASC 815-40, which states that contracts that require or may require net cash settlement are liabilities recorded at fair value. If the instrument does not require liability classification under ASC 815-40, in order to conclude equity classification, the Company assesses whether the instrument is indexed to its common stock and whether the instrument is classified as equity under ASC 815-40 or other applicable GAAP.

Equity linked instruments that are accounted for in accordance with ASC 815-40 are reported as liabilities on the condensed consolidated balance sheets at fair

value. Any change in fair value, as determined at each measurement period, is recorded as a component of other income (expense), net on the condensed consolidated statements of operations and comprehensive loss. Changes in fair value are reported on the condensed consolidated statements of cash flows as change in fair value of forward contract and derivative liabilities.

The Company accounted for certain consideration agreed to in connection with the Amendment, dated as of May 1, 2024 (the "Knopp Amendment"), to the Membership Interest Purchase Agreement, dated as of February 24, 2022 (the "Purchase Agreement") entered into with Knopp Biosciences, LLC ("Knopp") as derivative liabilities under ASC 815 (see Notes 4, "Fair Value of Financial Assets and Liabilities" and 10, "License, Acquisitions and Other Agreements").

Warrants

The Company evaluates warrants issued as either equity instruments, liabilities or derivative liabilities in accordance with ASC Topic 480, Distinguishing Liabilities from Equity ("ASC 480") and/or ASC Topic 815, Derivatives and Hedging ("ASC 815"), depending on the specific terms of the warrant agreement.

The Company assessed the warrants issued to Knopp in May 2024 (the "Knopp Warrants") and concluded that they met the criteria for equity classification under ASC 480 and ASC 815. Accordingly, the Knopp Warrants were recorded within additional paid-in capital on the condensed consolidated balance sheet at the time of issuance and are not subject to remeasurement. See Note 6, Shareholders' Equity for further detail on the Knopp Warrants.

Fair Value Measurements

Certain assets and liabilities of the Company are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) 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. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value

hierarchy, of which the first two are considered observable and the last is considered unobservable:

•Level 1—Quoted prices in active markets for identical assets or liabilities.

•Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data.

•Level 3—Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

The carrying values of other current assets, accounts payable, and accrued expenses approximate their fair values due to the short-term nature of these assets and liabilities.

The Company has accounted for certain consideration agreed to in connection with the Knopp Amendment as forward contract liabilities, which are recorded on the condensed consolidated balance sheets at fair value. Any changes in fair value, as determined each measurement period, are recorded as a component of other income (expense), net on the condensed consolidated statements of operations and comprehensive loss. The fair value of the forward contract liabilities is determined based on significant inputs not observable in the market, and therefore represents a Level 3 measurement within the fair value hierarchy. The valuations are based on a Monte Carlo simulation of the Company's share price, which requires judgement and assumption on the volatility of

Biohaven's share price, discounted to present value using a risk-free rate plus Biohaven specific credit risk since payable in a variable number of shares. (see Notes 4, "Fair Value of Financial Assets and Liabilities" and 10, "License, Acquisitions and Other Agreements").

Recently Issued Accounting Pronouncements

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting—Improvements to Reportable Segment Disclosures, which improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The amendments in ASU No. 2023-07 apply to public entities, including those with a single reportable segment, and are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact ASU No. 2023-07 will have on its consolidated financial statements

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to improve the transparency of income tax disclosures by requiring consistent categories and greater disaggregation of information in the rate reconciliation and income taxes paid disaggregated by jurisdiction. The ASU also includes certain other amendments to improve the effectiveness of income tax disclosures. The amendments in ASU 2023-09 are effective for fiscal years beginning after December 15, 2024, with early adoption permitted for annual financial statements that have not yet been issued or made available for issuance. The Company is currently evaluating the impact ASU No. 2023-09 will have on its consolidated financial statements.