Description of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]
Nature of operations and basis of presentation	Nature of Operations VivoSim Labs, Inc., formerly known as Organovo Holdings, Inc. ("VivoSim" and the “Company”), is a pharmaceutical and biotechnology services company that is focused on providing testing of drugs and drug candidates in three-dimensional (“3D”) human tissue models of liver and intestine. The Company offers partners liver and intestinal toxicology insights using its new approach methodologies ("NAM") models. The Company anticipates accelerated adoption of human tissue models following the U.S. Food and Drug Administration (“FDA") announcement on April 10, 2025 to refine animal testing requirements in favor of these non-animal NAM methods. The Company will also offer bespoke services in the areas of investigational toxicology, mechanism of drug action elucidation, and other applications of these complex human tissue models. Prior to March 2025, the Company was a clinical stage biotechnology company that was focused on developing FXR314 in inflammatory bowel disease ("IBD"), including ulcerative colitis ("UC"), based on demonstration of clinical promise in 3D human tissues as well as strong preclinical data. The Company's clinical focus was in advancing FXR314 in IBD, including UC and Crohn’s disease. The Company planned to start a Phase 2a clinical trial in UC in the calendar year 2025 and was also exploring the potential for combination therapies using FXR314 and approved mechanisms in preclinical animal studies and the Company's IBD disease models. In March 2025, the Company sold its FXR program for $10.0 million, with $9.0 million paid at closing and $1.0 million held in escrow for a period of 15 months, with future milestones of up to $50.0 million in the aggregate to be paid if the lead asset, FXR314, hits key development, regulatory and commercial milestones. Effective April 24, 2025, the Company changed its corporate name to VivoSim Labs, Inc. by filing a Certificate of Amendment to its Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware. The Company changed its name to reflect its new business model, which includes the use of other longstanding assets of the Company, intestinal and liver tox models and expertise, and its IP portfolio for 3D bioprinting. The Company is now offering liver toxicology predictive screening and research services as well as working on predicting and studying the intestinal side effect profiles of drugs that are therapeutic candidates of pharmaceutical and biotech companies at all stages of drug development. The Company's services offer the potential benefit of reducing the significant risk and cost of bringing therapeutics to market through the regulatory process. It is estimated that less than 10% of drug candidates entering clinical trials are approved, with a portion of the failures due to unexpected liver toxicity or intestinal intolerability. In addition, even approved drugs are occasionally withdrawn after liver toxicity is determined to be caused by the drug in a phenomenon called drug induced liver injury. The Company presented findings at the May 2025 Digestive Disease Week scientific conference showing that the liver toxicology platform had a best-in-class predictive power. VivoSim's liver predictive power was shown to be 87.5% for a set of challenging liver toxicity cases – inclusive of classic cases of “liver tox misses” drugs with unforeseen liver toxicity found in clinical trials or drugs that were withdrawn from the market after liver toxicity issues emerged later. The platform identified correctly that 87.5% of the known liver-toxic drugs could be seen as liver toxic using NAMkind™ liver. This is known as the sensitivity of the platform, which at 87.5% is a world’s best. Importantly, the specificity was 100%, meaning that none of the compounds tested that are not liver toxic were incorrectly identified as having liver toxicity issues by the platform. The Company uses its proprietary technologies to build functional 3D human tissues that mimic key aspects of native human tissue composition, architecture, function, and disease. The Company believes these attributes can enable critical complex, multicellular disease models that can be used to study and develop clinically effective drugs across multiple therapeutic areas. The Company has also used these human disease models to identify new molecular targets responsible for driving IBD and to explore the mechanism of action of known drugs including JAK inhibitors and related molecules. A portion of its internal research continues to focus on early stage internal drug discovery programs, validating targets, and testing potentially licensable or transactable external drug compounds to identify drug candidates for partnering and/or internal clinical development. In February 2024, the Company formed its Mosaic Cell Sciences division (“Mosaic”) that was intended to serve as a key source of certain primary human cells that the Company utilizes in its research and development efforts. Mosaic provided the Company with qualified human cells for use in its clinical research and development programs. In addition to supplying the Company with primary human cells, Mosaic offered human cells for sale to life science customers, both directly and through distribution partners, which the Company expected to offset costs and over time become a profit center that offset overall research and development ("R&D") spending by the Company. The Company ended Mosaic's commercial sales operations in the third quarter of fiscal 2025, and any remaining saleable inventory was internally transferred to R&D at that time.
Liquidity and Going Concern	Liquidity and Going Concern The accompanying Consolidated Financial Statements have been prepared on the basis that the Company is a going concern, which contemplates, among other things, the realization of assets and satisfaction of liabilities in the normal course of business. As of March 31, 2025, the Company had cash and cash equivalents of approximately $11.3 million, restricted cash of approximately $0.1 million and an accumulated deficit of approximately $342.2 million. The restricted cash was pledged as collateral for a letter of credit that the Company is required to maintain as a security deposit under the terms of the lease agreements for its facilities. The Company also had negative cash flows from operations of approximately $9.5 million during the year ended March 31, 2025. As of March 31, 2025, the Company had total current assets of approximately $12.1 million and current liabilities of approximately $3.7 million, resulting in working capital of $8.4 million. Through March 31, 2025, the Company has financed its operations primarily through the sale of common stock through public and at-the-market (“ATM”) offerings, the private placement of equity securities, from revenue derived from the licensing of intellectual property, products and research-based services, grants, and collaborative research agreements, the sale of the Company’s FXR program, and from the sale of convertible notes. During the year ended March 31, 2025, the Company issued 493,372 shares of its common stock through its ATM facility, for net proceeds of approximately $4.9 million. On March 25, 2025, the Company sold its FXR program for $10.0 million, with $9.0 million paid at closing and $1.0 million held in escrow for a period of 15 months, with future milestones of up to $50.0 million to be paid if the lead asset, FXR314, hits key regulatory and commercial milestones. Based on the Company's current operating plan and available cash resources, the Company will need substantial additional funding to support future operating activities. The Company has concluded that the prevailing conditions and ongoing liquidity risks faced by the Company raise substantial doubt about its ability to continue as a going concern for at least one year following the date these Consolidated Financial Statements are issued. The accompanying Consolidated Financial Statements do not include any adjustments that might be necessary should the Company be unable to continue as a going concern. As the Company continues its operations and is focusing its efforts on services, research, and development, the Company will need to raise additional capital to implement this business plan. The Company cannot predict with certainty the exact amount or timing for any future capital raises. The Company will seek to raise additional capital through debt or equity financings, or through some other financing arrangement. However, the Company cannot be sure that additional financing will be available if and when needed, or that, if available, it can obtain financing on terms favorable to its stockholders. Any failure to obtain financing when required will have a material adverse effect on the Company’s business, operating results, and financial condition.
Nasdaq Deficiency Notices	Nasdaq Deficiency Notices On July 18, 2024, the Company received a written notice from the Listing Qualifications Staff (the "Staff") of the Nasdaq Stock Market LLC (“Nasdaq”) indicating that, based upon the closing bid price of the Company’s common stock for the last 30 consecutive business days, the Company no longer meets the requirement to maintain a minimum bid price of $1 per share, as set forth in Nasdaq Listing Rule 5550(a)(2) (“Rule 5550(a)(2)”). In accordance with Nasdaq Listing Rule 5810(c)(3)(A), the Company was provided an initial period of 180 calendar days, or until January 14, 2025, to regain compliance. On January 16, 2025, the Staff provided a notice to the Company (the “Nasdaq Notice”) that it had not regained compliance with Rule 5550(a)(2) and was not eligible for a second 180 calendar day compliance period as it did not comply with the requirements for initial listing on the Nasdaq Capital Market. The Nasdaq Notice further indicated that, unless the Company timely requested a hearing before a Hearings Panel (the “Hearings Panel”), the Company’s common stock would be subject to delisting. The Company timely requested a hearing, which automatically stayed any delisting or suspension action pending the hearing and the expiration of any extension period granted by the Hearings Panel following the hearing. On February 19, 2025, the Company received a written notice from the Staff of Nasdaq indicating that, since the Company’s Quarterly Report on Form 10-Q for the period ended December 31, 2024 reported stockholders’ equity of $364,000, and as of February 19, 2025, the Company did not meet the alternatives of market value of listed securities or net income from continuing operations, the Company no longer met the requirement to maintain a minimum of $2,500,000 in stockholders’ equity, as set forth in Nasdaq Listing Rule 5550(b)(1) (“Rule 5550(b)(1)”). On March 31, 2025, the Company effected a 1-for-12 reverse stock split of its common stock (the “Reverse Stock Split”). On March 27, 2025, the Hearings Panel granted the Company an exception until April 15, 2025 to demonstrate compliance with Rule 5550(a)(2) and Rule 5550(b)(1). On April 30, 2025, the Company received a letter from Nasdaq notifying it that it has demonstrated compliance with Rule 5550(a)(2) and Rule 5550(b)(1) as required by the Hearings Panel’s March 27, 2025 decision. Pursuant to Nasdaq Listing Rule 5815(d)(4)(B), the Company will be subject to a Mandatory Panel Monitor for a period of one year from the date of Nasdaq’s letter.
Reverse Stock Split	Reverse Stock Split The par value per share and the number of authorized shares were not adjusted as a result of the Reverse Stock Split. The shares of common stock underlying outstanding stock options, common stock warrants and other equity instruments were proportionately reduced and the respective exercise prices, if applicable, were proportionately increased in accordance with the terms of the agreements governing such securities. In addition, the shares available for grants under the Company’s incentive plans were adjusted as a result of the Reverse Stock Split. All references to common stock, options to purchase common stock, outstanding common stock warrants, common stock share data, per share data, and related information contained in the consolidated financial statements have been retrospectively adjusted to reflect the effect of the Reverse Stock Split for all periods presented.
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP"). Any reference in these notes to applicable guidance is meant to refer to U.S. GAAP as found in the Accounting Standards Codification ("ASC") and Accounting Standards Updates promulgated by the Financial Accounting Standards Board ("FASB"). The Consolidated Financial Statements include the accounts of VivoSim and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect certain reported amounts and disclosures. Accordingly, actual results could differ from those estimates. On an ongoing basis, management reviews these estimates and assumptions.
Financial Instruments	Financial Instruments For certain of the Company’s financial instruments, including cash and cash equivalents, prepaid expenses and other assets, accounts payable, accrued expenses, the carrying amounts are generally considered to be representative of their respective fair values because of the short-term nature of those instruments.
Credit risk and significant customers	Credit Risk and Significant Customers Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash equivalents and short-term investments. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company has not experienced any material losses in such accounts and believes it is not exposed to significant risk. The Company has invested its excess cash primarily in money market funds and U.S. Treasury securities. Additionally, the Company adheres to established guidelines regarding approved investments and maturities of investments, which are designed to preserve their principal value and maintain liquidity. The Company is also potentially subject to concentrations of credit risk in its revenues and receivable accounts. The Company’s receivables to date have been derived from a relatively small number of customers and third parties. The Company makes judgment as to its ability to collect outstanding receivables and provides reserves against receivables for estimated losses that may result from a customer or third party's ability to pay. Specific amounts determined to be uncollectable are charged against the reserve. The Company has not historically experienced any receivable write-downs and management does not believe significant credit risk exists as of March 31, 2025.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents.
Restricted Cash	Restricted Cash As of March 31, 2025 and 2024, the Company had approximately $0.1 million of restricted cash, deposited with a financial institution. The entire amount was held in certificates of deposit to support a letter of credit agreement related to the Company’s facility leases entered into in November 2020 and amended in November 2021.
Investments	Investments Investments consist of investments in debt securities. Investments in debt securities consist of investments in U.S. Treasury bills. Any investments that have original maturities of three months or less are classified as cash equivalents on the Consolidated Balance Sheets. As of March 31, 2025, all Company investments, which consisted of U.S. Treasury bills, matured. As of March 31, 2024, all investments were classified as available-for-sale, as the sale of such investments may be required prior to maturity to implement management strategies. Available-for-sale debt securities are recorded at fair value. Any unrealized gains and losses are included in accumulated other comprehensive income as a component of stockholders' equity until realized. As U.S. Treasury bills are risk-free, any declines in fair value are considered temporary.
Fair Value Measurement	Fair Value Measurement Financial assets and liabilities are measured at fair value, which 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. The following is a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value: • Level 1 — Quoted prices in active markets for identical assets or liabilities. • Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • 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.
Insurance Premium Financing Liability	Insurance Premium Financing Liability In September 2024, the Company entered into an insurance premium financing agreement for $0.4 million, with a term of nine months and an annual interest rate of 8.57%. The Company made a down payment of 10% and is required to make monthly principal and interest payments of $44,281 over the term of the agreement, which matures in June 2025. The insurance premium financing liability was approximately $0.1 million as of March 31, 2025. Related prepaid insurance at March 31, 2025 of $0.2 million is included in prepaid expenses and other current assets on the accompanying Consolidated Balance Sheets.
Inventory	Inventory Inventories are stated at the lower of cost or net realizable value. Inventory as of March 31, 2024 consisted of approximately $0.3 million in finished goods, which was related to the Company's former division, Mosaic. There was no inventory as of March 31, 2025. The Company ended Mosaic's commercial operations in the third quarter of fiscal 2025. At that time, all remaining inventory was internally transferred to R&D and written off to research and development expenses.
Fixed Assets and Depreciation	Fixed Assets and Depreciation Fixed assets are carried at cost less accumulated depreciation. Expenditures that extend the life of the asset are capitalized and depreciated. Depreciation and amortization are provided using the straight-line method over the estimated useful lives of the related assets or, in the case of leasehold improvements, over the lesser of the useful life of the related asset or the remaining lease term. The estimated useful lives of the fixed assets range between one and seven years.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets In accordance with authoritative guidance, the Company reviews its long-lived assets, including fixed assets and other assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts of the assets may not be fully recoverable. To determine recoverability of its long-lived assets, the Company evaluates whether future undiscounted net cash flows will be less than the carrying amount of the assets and adjusts the carrying amount of its assets to fair value. Management has determined that no impairment of long-lived assets occurred as of March 31, 2025 and 2024.
Research and Development	Research and Development Research and development expenses, including direct and allocated expenses, consist of independent research and development costs, as well as costs associated with sponsored research and development. Research and development costs are expensed as incurred.
Acquired In-Process Research and Development	Acquired In-Process Research and Development FXR Program In March 2023, the Company acquired Metacrine's FXR program for $4.0 million. The FXR program was determined to have no alternative future use, and therefore was considered acquired in-process research and development and fully expensed. Acquired in-process research and development expenses were included in total research and development expenses on the Consolidated Statements of Operations and Other Comprehensive Loss. In the year ended March 31, 2023, the Company paid a $2.0 million upfront payment, and the remaining $2.0 million was paid in the year ended March 31, 2024, upon the final transfer of the drug compounds, related data, and IP. On March 25, 2025, the Company sold its FXR program and related assets to Eli Lilly and Company (the “FXR Asset Sale”). The consideration for the FXR Asset Sale consisted of (i) an upfront cash payment by Lilly to the Company equal to $10.0 million, of which $9.0 million was paid at closing and the remaining $1.0 million was deposited into escrow for 15 months to satisfy any claims for indemnification during such period, (ii) the assumption by Eli Lilly and Company of certain liabilities related to the FXR program, and (iii) potential milestone payments by Eli Lilly and Company of up to $50.0 million in the aggregate, which are contingent upon the achievement of certain development, regulatory and commercial milestones. The Company assessed whether this agreement was considered a contract with a customer pursuant to Topic 606 or subject to guidance pursuant to ASC Topic 610, Other Income ("Topic 610"). The Company considered a variety of factors in determining the appropriate assumptions under this arrangement, such as whether the counterparty was a customer, the nature of its operations, both historically and ongoing, and any contingent consideration constraints. The Company determined the counterparty was not a customer based on the nature of its ordinary business operations and recorded the transaction within other income under Topic 610. Furthermore, the Company determined the $1.0 million held in escrow was not constrained due to the terms of the indemnification language and it was therefore recognized as a component of the consideration received at the time of closing; however, the Company did determine future potential milestone payments that may be made by Eli Lilly and Company were constrained due to the uncertainty of the milestones being met. If and when the future milestone payments are no longer considered constrained, the Company will record such payments in other income.
Segment Reporting	Segment Reporting Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated on a regular basis by the chief operating decision maker in deciding how to allocate resources to an individual segment and in assessing performance. As of March 31, 2025, the Company identified only one operating segment. Please refer to "Note 15. Business Segment Information" for further information.
Income Taxes	Income Taxes Deferred income taxes are recognized for the tax consequences in future years for differences between the tax basis of assets and liabilities and their financial reporting amounts at each year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the combination of the tax payable for the year and the change during the year in deferred tax assets and liabilities. The Company’s policy regarding uncertainty in income taxes is pursuant to ASC Topic 740-10. Interest and penalties that would be assessed in relation to the settlement value of unrecognized tax benefits is recognized as a component of income tax expense.
Revenue Recognition	Revenue Recognition Royalty revenue The Company has entered into a license agreement with a company that includes the following: (i) non-refundable upfront fees and (ii) royalties based on specified percentages of net product sales, if any. At the initiation of the agreement, the Company has analyzed whether it results in a contract with a customer under Topic 606. The Company has considered a variety of factors in determining the appropriate estimates and assumptions under these arrangements, such as whether the Company is a principal or agent, whether the elements are distinct performance obligations, whether there are determinable stand-alone prices, and whether any licenses are functional or symbolic. The Company has evaluated each performance obligation to determine if it can be satisfied and recognized as revenue at a point in time or over time. Typically, non-refundable upfront fees have been considered fixed, while sales-based royalty payments have been identified as variable consideration which must be evaluated to determine if it has been constrained and, therefore, excluded from the transaction price. Please refer to “Note 6. Collaborative Research, Development, and License Agreements” for further information. Product revenue, net The Company’s former product-based division, Mosaic, which was established in the fourth quarter of fiscal 2024, produced high-quality cell-based products for use in its R&D and for use by life science customers. The Company recognized product revenue when the performance obligation is satisfied, which was at the point in time the customer obtained control of the Company’s product, typically upon delivery. Product revenues were recorded at the transaction price under Topic 606. The Company provided no right of return to its customers except in cases where a customer obtained authorization from the Company for the return. To date, there have been no product returns. The Company ended Mosaic's commercial operations during the third quarter of fiscal 2025.
Stock-Based Compensation	Stock-Based Compensation The Company accounts for stock-based compensation in accordance with the ASC Topic 718, Compensation — Stock Compensation, which establishes accounting for equity instruments exchanged for employee and non-employee services. Under such provisions, stock-based compensation cost is measured at the grant date, based on the calculated fair value of the award (determined using either the Black-Scholes or Monte Carlo option-pricing models, depending on the complexity of the equity grant), and is recognized as an expense, under the straight-line method, over the employee or non-employee's requisite service period (generally the vesting period of the equity grant). The assumed dividend yield is based on the Company’s expectation of not paying dividends in the foreseeable future. The Company uses its Company-specific historical volatility rate. The risk-free interest rate assumption is based on U.S. Treasury rates. The weighted average expected life of options is estimated using the average of the contractual term and the weighted average vesting term of the options. Option forfeitures are treated as a reduction of stock-based compensation expense and accounted for as they occur.
ComprehensiveIincome (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) is defined as the change in equity during a period from transactions and other events and circumstances from non-owner sources. The Company is required to record all components of comprehensive income (loss) in the consolidated financial statements in the period in which they are recognized. Net income (loss) and other comprehensive income (loss), including unrealized gains and losses on investments, are reported, net of their related tax effect, to arrive at comprehensive income (loss).
Net Loss Per Share	Net Loss Per Share Basic and diluted net loss per share has been computed using the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares used to compute diluted loss per share includes the assumed exercise of any outstanding pre-funded warrants, and excludes any assumed exercise of stock options, shares reserved for purchase under the Company’s 2023 Employee Stock Purchase Plan, the assumed vesting of restricted stock units, the exercise of common warrants, and shares subject to repurchase as the effect would be anti-dilutive. No dilutive effect was calculated for the years ended March 31, 2025 and 2024 as the Company reported a net loss for each respective period and the effect would have been anti-dilutive. Common stock equivalents excluded from computing diluted net loss per share due to their anti-dilutive effect were approximately 0.7 million shares and less than 0.1 million shares for the years ended March 31, 2025 and 2024, respectively.

Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2025

Nature of operations and basis of presentation

Nature of Operations

VivoSim Labs, Inc., formerly known as Organovo Holdings, Inc. ("VivoSim" and the “Company”), is a pharmaceutical and biotechnology services company that is focused on providing testing of drugs and drug candidates in three-dimensional (“3D”) human tissue models of liver and intestine. The Company offers partners liver and intestinal toxicology insights using its new approach methodologies ("NAM") models. The Company anticipates accelerated adoption of human tissue models following the U.S. Food and Drug Administration (“FDA") announcement on April 10, 2025 to refine animal testing requirements in favor of these non-animal NAM methods. The Company will also offer bespoke services in the areas of investigational toxicology, mechanism of drug action elucidation, and other applications of these complex human tissue models.

Prior to March 2025, the Company was a clinical stage biotechnology company that was focused on developing FXR314 in inflammatory bowel disease ("IBD"), including ulcerative colitis ("UC"), based on demonstration of clinical promise in 3D human tissues as well as strong preclinical data. The Company's clinical focus was in advancing FXR314 in IBD, including UC and Crohn’s disease. The Company planned to start a Phase 2a clinical trial in UC in the calendar year 2025 and was also exploring the potential for combination therapies using FXR314 and approved mechanisms in preclinical animal studies and the Company's IBD disease models.

In March 2025, the Company sold its FXR program for $10.0 million, with $9.0 million paid at closing and $1.0 million held in escrow for a period of 15 months, with future milestones of up to $50.0 million in the aggregate to be paid if the lead asset, FXR314, hits key development, regulatory and commercial milestones.

Effective April 24, 2025, the Company changed its corporate name to VivoSim Labs, Inc. by filing a Certificate of Amendment to its Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware. The Company changed its name to reflect its new business model, which includes the use of other longstanding assets of the Company, intestinal and liver tox models and expertise, and its IP portfolio for 3D bioprinting.

The Company is now offering liver toxicology predictive screening and research services as well as working on predicting and studying the intestinal side effect profiles of drugs that are therapeutic candidates of pharmaceutical and biotech companies at all stages of drug development. The Company's services offer the potential benefit of reducing the significant risk and cost of bringing therapeutics to market through the regulatory process. It is estimated that less than 10% of drug candidates entering clinical trials are approved, with a portion of the failures due to unexpected liver toxicity or intestinal intolerability. In addition, even approved drugs are occasionally withdrawn after liver toxicity is determined to be caused by the drug in a phenomenon called drug induced liver injury. The Company presented findings at the May 2025 Digestive Disease Week scientific conference showing that the liver toxicology platform had a best-in-class predictive power. VivoSim's liver predictive power was shown to be 87.5% for a set of challenging liver toxicity cases – inclusive of classic cases of “liver tox misses” drugs with unforeseen liver toxicity found in clinical trials or drugs that were withdrawn from the market after liver toxicity issues emerged later. The platform identified correctly that 87.5% of the known liver-toxic drugs could be seen as liver toxic using NAMkind™ liver. This is known as the sensitivity of the platform, which at 87.5% is a world’s best. Importantly, the specificity was 100%, meaning that none of the compounds tested that are not liver toxic were incorrectly identified as having liver toxicity issues by the platform.

The Company uses its proprietary technologies to build functional 3D human tissues that mimic key aspects of native human tissue composition, architecture, function, and disease. The Company believes these attributes can enable critical complex, multicellular disease models that can be used to study and develop clinically effective drugs across multiple therapeutic areas.

The Company has also used these human disease models to identify new molecular targets responsible for driving IBD and to explore the mechanism of action of known drugs including JAK inhibitors and related molecules. A portion of its internal research continues to focus on early stage internal drug discovery programs, validating targets, and testing potentially licensable or transactable external drug compounds to identify drug candidates for partnering and/or internal clinical development.

In February 2024, the Company formed its Mosaic Cell Sciences division (“Mosaic”) that was intended to serve as a key source of certain primary human cells that the Company utilizes in its research and development efforts. Mosaic provided the Company with qualified human cells for use in its clinical research and development programs. In addition to supplying the Company with primary human cells, Mosaic offered human cells for sale to life science customers, both directly and through distribution partners, which the Company expected to offset costs and over time become a profit center that offset overall research and development ("R&D") spending by the Company. The Company ended Mosaic's commercial sales operations in the third quarter of fiscal 2025, and any remaining saleable inventory was internally transferred to R&D at that time.

Liquidity and Going Concern

The accompanying Consolidated Financial Statements have been prepared on the basis that the Company is a going concern, which contemplates, among other things, the realization of assets and satisfaction of liabilities in the normal course of business. As of March 31, 2025, the Company had cash and cash equivalents of approximately $11.3 million, restricted cash of approximately $0.1 million and an accumulated deficit of approximately $342.2 million. The restricted cash was pledged as collateral for a letter of credit that the Company is required to maintain as a security deposit under the terms of the lease agreements for its facilities. The Company also had negative cash flows from operations of approximately $9.5 million during the year ended March 31, 2025. As of March 31, 2025, the Company had total current assets of approximately $12.1 million and current liabilities of approximately $3.7 million, resulting in working capital of $8.4 million.

Through March 31, 2025, the Company has financed its operations primarily through the sale of common stock through public and at-the-market (“ATM”) offerings, the private placement of equity securities, from revenue derived from the licensing of intellectual property, products and research-based services, grants, and collaborative research agreements, the sale of the Company’s FXR program, and from the sale of convertible notes. During the year ended March 31, 2025, the Company issued 493,372 shares of its common stock through its ATM facility, for net proceeds of approximately $4.9 million.

On March 25, 2025, the Company sold its FXR program for $10.0 million, with $9.0 million paid at closing and $1.0 million held in escrow for a period of 15 months, with future milestones of up to $50.0 million to be paid if the lead asset, FXR314, hits key regulatory and commercial milestones.

Based on the Company's current operating plan and available cash resources, the Company will need substantial additional funding to support future operating activities. The Company has concluded that the prevailing conditions and ongoing liquidity risks faced by the Company raise substantial doubt about its ability to continue as a going concern for at least one year following the date these Consolidated Financial Statements are issued. The accompanying Consolidated Financial Statements do not include any adjustments that might be necessary should the Company be unable to continue as a going concern. As the Company continues its operations and is focusing its efforts on services, research, and development, the Company will need to raise additional capital to implement this business plan. The Company cannot predict with certainty the exact amount or timing for any future capital raises. The Company will seek to raise additional capital through debt or equity financings, or through some other financing arrangement. However, the Company cannot be sure that additional financing will be available if and when needed, or that, if available, it can obtain financing on terms favorable to its stockholders. Any failure to obtain financing when required will have a material adverse effect on the Company’s business, operating results, and financial condition.

Nasdaq Deficiency Notices

On July 18, 2024, the Company received a written notice from the Listing Qualifications Staff (the "Staff") of the Nasdaq Stock Market LLC (“Nasdaq”) indicating that, based upon the closing bid price of the Company’s common stock for the last 30 consecutive business days, the Company no longer meets the requirement to maintain a minimum bid price of $1 per share, as set forth in Nasdaq Listing Rule 5550(a)(2) (“Rule 5550(a)(2)”). In accordance with Nasdaq Listing Rule 5810(c)(3)(A), the Company was provided an initial period of 180 calendar days, or until January 14, 2025, to regain compliance.

On January 16, 2025, the Staff provided a notice to the Company (the “Nasdaq Notice”) that it had not regained compliance with Rule 5550(a)(2) and was not eligible for a second 180 calendar day compliance period as it did not comply with the requirements for initial listing on the Nasdaq Capital Market. The Nasdaq Notice further indicated that, unless the Company timely requested a hearing before a Hearings Panel (the “Hearings Panel”), the Company’s common stock would be subject to delisting. The Company timely requested a hearing, which automatically stayed any delisting or suspension action pending the hearing and the expiration of any extension period granted by the Hearings Panel following the hearing.

On February 19, 2025, the Company received a written notice from the Staff of Nasdaq indicating that, since the Company’s Quarterly Report on Form 10-Q for the period ended December 31, 2024 reported stockholders’ equity of $364,000, and as of February 19, 2025, the Company did not meet the alternatives of market value of listed securities or net income from continuing operations, the Company no longer met the requirement to maintain a minimum of $2,500,000 in stockholders’ equity, as set forth in Nasdaq Listing Rule 5550(b)(1) (“Rule 5550(b)(1)”).

On March 31, 2025, the Company effected a 1-for-12 reverse stock split of its common stock (the “Reverse Stock Split”). On March 27, 2025, the Hearings Panel granted the Company an exception until April 15, 2025 to demonstrate compliance with Rule 5550(a)(2) and Rule 5550(b)(1). On April 30, 2025, the Company received a letter from Nasdaq notifying it that it has demonstrated compliance with Rule 5550(a)(2) and Rule 5550(b)(1) as required by the Hearings Panel’s March 27, 2025 decision. Pursuant to Nasdaq Listing

Rule 5815(d)(4)(B), the Company will be subject to a Mandatory Panel Monitor for a period of one year from the date of Nasdaq’s letter.

Reverse Stock Split

The par value per share and the number of authorized shares were not adjusted as a result of the Reverse Stock Split. The shares of

common stock underlying outstanding stock options, common stock warrants and other equity instruments were proportionately reduced and the respective exercise prices, if applicable, were proportionately increased in accordance with the terms of the agreements governing such securities. In addition, the shares available for grants under the Company’s incentive plans were adjusted as a result of the Reverse Stock Split. All references to common stock, options to purchase common stock, outstanding common stock

warrants, common stock share data, per share data, and related information contained in the consolidated financial statements have been retrospectively adjusted to reflect the effect of the Reverse Stock Split for all periods presented.

Basis of Presentation and Principles of Consolidation

The accompanying Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP"). Any reference in these notes to applicable guidance is meant to refer to U.S. GAAP as found in the Accounting Standards Codification ("ASC") and Accounting Standards Updates promulgated by the Financial Accounting Standards Board ("FASB").

The Consolidated Financial Statements include the accounts of VivoSim and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect certain reported amounts and disclosures. Accordingly, actual results could differ from those estimates. On an ongoing basis, management reviews these estimates and assumptions.

Financial Instruments

For certain of the Company’s financial instruments, including cash and cash equivalents, prepaid expenses and other assets, accounts payable, accrued expenses, the carrying amounts are generally considered to be representative of their respective fair values because of the short-term nature of those instruments.

Credit risk and significant customers

Credit Risk and Significant Customers

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash equivalents and short-term investments. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company has not experienced any material losses in such accounts and believes it is not exposed to significant risk. The Company has invested its excess cash primarily in money market funds and U.S. Treasury securities. Additionally, the Company adheres to established guidelines regarding approved investments and maturities of investments, which are designed to preserve their principal value and maintain liquidity.

The Company is also potentially subject to concentrations of credit risk in its revenues and receivable accounts. The Company’s receivables to date have been derived from a relatively small number of customers and third parties. The Company makes judgment as to its ability to collect outstanding receivables and provides reserves against receivables for estimated losses that may result from a customer or third party's ability to pay. Specific amounts determined to be uncollectable are charged against the reserve. The Company has not historically experienced any receivable write-downs and management does not believe significant credit risk exists as of March 31, 2025.

Cash and Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents.

Restricted Cash

As of March 31, 2025 and 2024, the Company had approximately $0.1 million of restricted cash, deposited with a financial institution. The entire amount was held in certificates of deposit to support a letter of credit agreement related to the Company’s facility leases entered into in November 2020 and amended in November 2021.

Investments

Investments consist of investments in debt securities.

Investments in debt securities consist of investments in U.S. Treasury bills. Any investments that have original maturities of three months or less are classified as cash equivalents on the Consolidated Balance Sheets. As of March 31, 2025, all Company investments, which consisted of U.S. Treasury bills, matured. As of March 31, 2024, all investments were classified as available-for-sale, as the sale of such investments may be required prior to maturity to implement management strategies. Available-for-sale debt securities are recorded at fair value. Any unrealized gains and losses are included in accumulated other comprehensive income as a component of stockholders' equity until realized. As U.S. Treasury bills are risk-free, any declines in fair value are considered temporary.

Fair Value Measurement

Financial assets and liabilities are measured at fair value, which 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. The following is a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value:

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

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Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

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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.

Insurance Premium Financing Liability

In September 2024, the Company entered into an insurance premium financing agreement for $0.4 million, with a term of nine months and an annual interest rate of 8.57%. The Company made a down payment of 10% and is required to make monthly principal and interest payments of $44,281 over the term of the agreement, which matures in June 2025. The insurance premium financing liability was approximately $0.1 million as of March 31, 2025. Related prepaid insurance at March 31, 2025 of $0.2 million is included in prepaid expenses and other current assets on the accompanying Consolidated Balance Sheets.

Inventory

Inventories are stated at the lower of cost or net realizable value. Inventory as of March 31, 2024 consisted of approximately $0.3 million in finished goods, which was related to the Company's former division, Mosaic. There was no inventory as of March 31, 2025. The Company ended Mosaic's commercial operations in the third quarter of fiscal 2025. At that time, all remaining inventory was internally transferred to R&D and written off to research and development expenses.

Fixed Assets and Depreciation

Fixed assets are carried at cost less accumulated depreciation. Expenditures that extend the life of the asset are capitalized and depreciated. Depreciation and amortization are provided using the straight-line method over the estimated useful lives of the related assets or, in the case of leasehold improvements, over the lesser of the useful life of the related asset or the remaining lease term. The estimated useful lives of the fixed assets range between one and seven years.

Impairment of Long-Lived Assets

In accordance with authoritative guidance, the Company reviews its long-lived assets, including fixed assets and other assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts of the assets may not be fully recoverable. To determine recoverability of its long-lived assets, the Company evaluates whether future undiscounted net cash flows will be less than the carrying amount of the assets and adjusts the carrying amount of its assets to fair value. Management has determined that no impairment of long-lived assets occurred as of March 31, 2025 and 2024.

Research and Development

Research and development expenses, including direct and allocated expenses, consist of independent research and development costs, as well as costs associated with sponsored research and development. Research and development costs are expensed as incurred.

Acquired In-Process Research and Development

FXR Program

In March 2023, the Company acquired Metacrine's FXR program for $4.0 million. The FXR program was determined to have no alternative future use, and therefore was considered acquired in-process research and development and fully expensed. Acquired in-process research and development expenses were included in total research and development expenses on the Consolidated Statements of Operations and Other Comprehensive Loss. In the year ended March 31, 2023, the Company paid a $2.0 million upfront payment, and the remaining $2.0 million was paid in the year ended March 31, 2024, upon the final transfer of the drug compounds, related data, and IP.

On March 25, 2025, the Company sold its FXR program and related assets to Eli Lilly and Company (the “FXR Asset Sale”). The consideration for the FXR Asset Sale consisted of (i) an upfront cash payment by Lilly to the Company equal to $10.0 million, of which $9.0 million was paid at closing and the remaining $1.0 million was deposited into escrow for 15 months to satisfy any claims for indemnification during such period, (ii) the assumption by Eli Lilly and Company of certain liabilities related to the FXR program, and (iii) potential milestone payments by Eli Lilly and Company of up to $50.0 million in the aggregate, which are contingent upon the achievement of certain development, regulatory and commercial milestones.

The Company assessed whether this agreement was considered a contract with a customer pursuant to Topic 606 or subject to guidance pursuant to ASC Topic 610, Other Income ("Topic 610"). The Company considered a variety of factors in determining the appropriate assumptions under this arrangement, such as whether the counterparty was a customer, the nature of its operations, both historically and ongoing, and any contingent consideration constraints. The Company determined the counterparty was not a customer based on the nature of its ordinary business operations and recorded the transaction within other income under Topic 610. Furthermore, the Company determined the $1.0 million held in escrow was not constrained due to the terms of the indemnification language and it was therefore recognized as a component of the consideration received at the time of closing; however, the Company did determine future potential milestone payments that may be made by Eli Lilly and Company were constrained due to the uncertainty of the milestones being met. If and when the future milestone payments are no longer considered constrained, the Company will record such payments in other income.

Segment Reporting

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated on a regular basis by the chief operating decision maker in deciding how to allocate resources to an individual segment and in assessing performance. As of March 31, 2025, the Company identified only one operating segment. Please refer to "Note 15. Business Segment Information" for further information.

Income Taxes

Deferred income taxes are recognized for the tax consequences in future years for differences between the tax basis of assets and liabilities and their financial reporting amounts at each year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the combination of the tax payable for the year and the change during the year in deferred tax assets and liabilities. The Company’s policy regarding uncertainty in income taxes is pursuant to ASC Topic 740-10. Interest and penalties that would be assessed in relation to the settlement value of unrecognized tax benefits is recognized as a component of income tax expense.

Revenue Recognition

Royalty revenue

The Company has entered into a license agreement with a company that includes the following: (i) non-refundable upfront fees and (ii) royalties based on specified percentages of net product sales, if any. At the initiation of the agreement, the Company has analyzed whether it results in a contract with a customer under Topic 606.

The Company has considered a variety of factors in determining the appropriate estimates and assumptions under these arrangements, such as whether the Company is a principal or agent, whether the elements are distinct performance obligations, whether there are determinable stand-alone prices, and whether any licenses are functional or symbolic. The Company has evaluated each performance obligation to determine if it can be satisfied and recognized as revenue at a point in time or over time. Typically, non-refundable upfront fees have been considered fixed, while sales-based royalty payments have been identified as variable consideration which must be evaluated to determine if it has been constrained and, therefore, excluded from the transaction price. Please refer to “Note 6. Collaborative Research, Development, and License Agreements” for further information.

Product revenue, net

The Company’s former product-based division, Mosaic, which was established in the fourth quarter of fiscal 2024, produced high-quality cell-based products for use in its R&D and for use by life science customers. The Company recognized product revenue when the performance obligation is satisfied, which was at the point in time the customer obtained control of the Company’s product, typically upon delivery. Product revenues were recorded at the transaction price under Topic 606. The Company provided no right of return to its customers except in cases where a customer obtained authorization from the Company for the return. To date, there have been no product returns. The Company ended Mosaic's commercial operations during the third quarter of fiscal 2025.

Stock-Based Compensation

The Company accounts for stock-based compensation in accordance with the ASC Topic 718, Compensation — Stock Compensation, which establishes accounting for equity instruments exchanged for employee and non-employee services. Under such provisions, stock-based compensation cost is measured at the grant date, based on the calculated fair value of the award (determined using either the Black-Scholes or Monte Carlo option-pricing models, depending on the complexity of the equity grant), and is recognized as an expense, under the straight-line method, over the employee or non-employee's requisite service period (generally the vesting period of the equity grant). The assumed dividend yield is based on the Company’s expectation of not paying dividends in the foreseeable future. The Company uses its Company-specific historical volatility rate. The risk-free interest rate assumption is based on U.S. Treasury rates. The weighted average expected life of options is estimated using the average of the contractual term and the weighted average vesting term of the options. Option forfeitures are treated as a reduction of stock-based compensation expense and accounted for as they occur.

ComprehensiveIincome (Loss)

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity during a period from transactions and other events and circumstances from non-owner sources. The Company is required to record all components of comprehensive income (loss) in the consolidated financial statements in the period in which they are recognized. Net income (loss) and other comprehensive income (loss), including unrealized gains and losses on investments, are reported, net of their related tax effect, to arrive at comprehensive income (loss).

Net Loss Per Share

Basic and diluted net loss per share has been computed using the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares used to compute diluted loss per share includes the assumed exercise of any outstanding pre-funded warrants, and excludes any assumed exercise of stock options, shares reserved for purchase under the Company’s 2023 Employee Stock Purchase Plan, the assumed vesting of restricted stock units, the exercise of common warrants, and shares subject to repurchase as the effect would be anti-dilutive. No dilutive effect was calculated for the years ended March 31, 2025 and 2024 as the Company reported a net loss for each respective period and the effect would have been anti-dilutive.

Common stock equivalents excluded from computing diluted net loss per share due to their anti-dilutive effect were approximately 0.7 million shares and less than 0.1 million shares for the years ended March 31, 2025 and 2024, respectively.