0001828791-26-000019 | 10-K | XBRL Viewer | Viant Technology INC

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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2025 impression Customer Supplier	Dec. 31, 2024 Customer Supplier
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Ad impressions \| impression	1,000
Invoice payment terms	90 days
Number of customer \| Customer	2	1
Number of supplier \| Supplier	1	3
Tax receivable agreement required to make payments to shareholders realized percentage of tax benefits in event that exchange of units to shares	85.00%
Tax receivable agreement expected remaining tax benefit percentage	15.00%

Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2025	Mar. 10, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2025
Document Fiscal Year Focus	2025
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40015
Entity Registrant Name	Viant Technology Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-3447553
Entity Address, Address Line One	2722 Michelson Drive
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92612
City Area Code	949
Local Phone Number	861-8888
Title of 12(b) Security	Class A common stock, par value $0.001 per share
Trading Symbol	DSP
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 185.1
Entity Common Stock, Shares Outstanding		45,597,216
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive Proxy Statement for its 2026 Annual Meeting of Stockholders, which the registrant intends to file pursuant to Regulation 14A with the Securities and Exchange Commission no later than 120 days after the registrant’s fiscal year ended December 31, 2025, are incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001828791
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Small Business	true

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2025
Audit Information [Abstract]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Costa Mesa, California

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2025
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and include the operations of the Company, Viant Technology LLC and its wholly owned subsidiaries. Viant Technology LLC is considered a variable interest entity (“VIE”). The Company is the primary beneficiary and sole managing member of Viant Technology LLC and has decision-making authority that significantly affects the economic performance of the entity. As a result, the Company consolidates Viant Technology LLC. All intercompany balances and transactions have been eliminated in consolidation. Management believes that the accompanying consolidated financial statements reflect the adjustments necessary for the fair statement of its consolidated balance sheets as of December 31, 2025 and 2024, statements of operations for the years ended December 31, 2025, 2024 and 2023 ("fiscal year 2025", "fiscal year 2024", and "fiscal year 2023"), statements of stockholders' equity as of December 31, 2025, 2024 and 2023, and statements of cash flows for the years ended December 31, 2025, 2024 and 2023.
Related Party Relationships	Related Party Relationships Capital V LLC (formerly Four Brothers 2 LLC), the holder of Class B common stock as of December 31, 2025, is controlled by the Company’s co-founders, Tim Vanderhook and Chris Vanderhook, and therefore is considered a related party. Refer to Note 14—Related Parties for additional information.
Tax Receivable Agreement	Tax Receivable Agreement The Company expects to obtain an increase in its share of tax basis in the net assets of Viant Technology LLC when Class B units are exchanged by the holders of Class B units for shares of Class A common stock of the Company and upon other qualifying transactions. Each change in outstanding shares of Class A common stock of the Company results in a corresponding increase or decrease in the Company's ownership of Class A units of Viant Technology LLC. The Company intends to treat any exchanges of Class B units as direct purchases of LLC interests for U.S. federal income tax purposes. These increases in tax basis may reduce the amounts that the Company would otherwise pay in the future to various taxing authorities. They may also decrease gains (or increase losses) on future dispositions of certain capital assets to the extent tax basis is allocated to those capital assets. In connection with its initial public offering ("IPO"), the Company entered into a Tax Receivable Agreement (the “TRA”) with Viant Technology LLC, continuing members of Viant Technology LLC (not including us) and the TRA Representative. The TRA provides for payment by us to continuing members of Viant Technology LLC (not including us) of 85% of the amount of the net cash tax savings, if any, that we realize (or, under certain circumstances, are deemed to realize) as a result of increases in tax basis (and utilization of certain other tax benefits) resulting from (i) our acquisition of Viant Technology LLC units from such continuing members of Viant Technology LLC in connection with the IPO and in future exchanges and (ii) any payments we make under the TRA (including tax benefits related to imputed interest). We will retain the benefit of the remaining 15% of these net cash tax savings. The obligations under the TRA will be Viant Technology Inc.’s obligations and not obligations of Viant Technology LLC. The amount of the cash payments that we may be required to make under the TRA could be significant. The term of the TRA will continue until all tax benefits that are subject to the TRA have been utilized or have expired, unless we exercise our right to terminate the TRA (or it is otherwise terminated pursuant to its terms, including due to a change in control or our breach of a material obligation thereunder), in which case, we will be required to make the termination payment specified in the TRA. In addition, any payments we make under the TRA will be increased by any interest accrued from the due date (without extensions) of the corresponding tax return. Any actual future payments to the continuing members of Viant Technology LLC will vary based on the factors discussed below. Estimating the amount and timing of payments that may be made under the TRA is by its nature imprecise, as the calculation of amounts payable depends on a variety of factors and future events. We expect to receive distributions from Viant Technology LLC in order to make any required payments under the TRA. However, we may need to incur debt to finance payments under the TRA to the extent such distributions or our cash resources are insufficient to meet our obligations under the TRA as a result of timing discrepancies or otherwise. The payments under the TRA are also not conditioned upon the continuing members of Viant Technology LLC maintaining a continued ownership interest in Viant Technology LLC or us. The actual increase in tax basis and utilization of tax attributes, as well as the amount and timing of any payments under the TRA, will vary depending on a number of factors, including the price of shares of our Class A common stock at the time of future exchanges; the timing of future exchanges; the extent to which such exchanges are taxable; the amount and timing of the utilization of tax attributes; the amount, timing and character of our income; the U.S. federal, state and local tax rates then applicable; the amount of each exchanging unitholder’s tax basis in its units at the time of the relevant exchange; the depreciation and amortization periods that apply to the increases in tax basis; and the timing and amount of any earlier payments that we may have made under the TRA and the portion of our payments under the TRA that constitute imputed interest or give rise to depreciable or amortizable tax basis. The increases in the tax basis of the intangible assets of Viant Technology LLC as a result of the exchanges of Viant Technology LLC units and certain other tax benefits will be subject to the TRA. As of December 31, 2025, we concluded that it was more likely than not that our deferred tax assets subject to the TRA will be realized. Therefore, we recorded a liability related to the tax savings we may realize from utilization of such deferred tax assets in the amount of $12.4 million related to the TRA. Upon recognition of the TRA, there may be a material negative effect on our financial condition and liquidity if, as described below, the payments under the TRA exceed the actual benefits we receive in respect of the tax attributes subject to the TRA and/or distributions to us by Viant Technology LLC are not sufficient to permit us to make payments under the TRA. The TRA provides that if (i) we exercise our right to early termination of the TRA in whole (that is, with respect to all benefits due to all beneficiaries under the TRA) or in part (that is, with respect to some benefits due to all beneficiaries under the TRA), (ii) we experience certain changes in control, (iii) the TRA is rejected in certain bankruptcy proceedings, (iv) we fail (subject to certain exceptions) to make a payment under the TRA within 180 days after the due date or (v) we materially breach our obligations under the TRA, we will be obligated to make an early termination payment to holders of rights under the TRA equal to the present value of all payments that we would be required to pay under the TRA. The amount of such payments will be determined on the basis of certain assumptions in the TRA, including (i) the assumption that we would have enough taxable income in the future to fully utilize the tax benefit resulting from the tax assets that are the subject of the TRA; (ii) the assumption that any item of loss deduction or credit generated by a basis adjustment or imputed interest arising in a taxable year preceding the taxable year that includes an early termination will be used by us ratably from such taxable year through the earlier of (x) the scheduled expiration of such tax item or (y) 15 years; (iii) the assumption that any non-amortizable assets are deemed to be disposed of in a fully taxable transaction on the fifteenth anniversary of the earlier of the basis adjustment and the early termination date; (iv) the assumption that U.S. federal, state and local tax rates will be the same as in effect on the early termination date, unless scheduled to change; and (v) the assumption that any units of Viant Technology LLC (other than those held by us) outstanding on the termination date are deemed to be exchanged for an amount equal to the market value of the corresponding number of shares of Class A common stock on the termination date. Any early termination payment may be made significantly in advance of the actual realization, if any, of the future tax benefits to which the termination payment relates.
Treasury Stock	Treasury Stock We account for treasury stock under the cost method. When treasury stock is re-issued at a price higher than its cost, the difference is recorded as a component of additional paid-in-capital in our consolidated balance sheets. When treasury stock is re-issued at a price lower than its cost, the difference is recorded as a component of additional paid-in-capital to the extent that there are previously recorded gains to offset the losses. If there are no treasury stock gains in additional paid-in-capital, the losses upon re-issuance of treasury stock are recorded as an increase in accumulated deficit in our consolidated balance sheets.
JOBS Act Election as an Emerging Growth Company	JOBS Act Election as an Emerging Growth Company On April 5, 2012, the Jumpstart Our Business Startups Act (the “JOBS Act”) was signed into law. The JOBS Act contains provisions that, among other things, reduce certain reporting requirements for qualifying public companies. As an “emerging growth company,” the Company may, under Section 7(a)(2)(B) of the Securities Act of 1933, as amended (the "Securities Act"), delay adoption of new or revised accounting standards applicable to public companies until such standards would otherwise apply to private companies. An “emerging growth company” is one with less than $1.235 billion in annual gross revenues, has issued $1 billion or less of non-convertible debt over a three-year period and is not deemed to be a large accelerated filer under the rules of the Securities and Exchange Commission ("SEC"). The Company will remain an emerging growth company until December 31, 2026, or sooner if it no longer qualifies. The Company has elected to take advantage of the benefits of this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the first to occur of the date that is (i) no longer an “emerging growth company” or (ii) affirmatively and irrevocably opts out of this extended transition period provided by Securities Act Section 7(a)(2)(B).

Insider Trading Arrangements	3 Months Ended	12 Months Ended
Insider Trading Arrangements	Dec. 31, 2025 shares	Dec. 31, 2025 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Larry Madden [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 15, 2025, Larry Madden, our Chief Financial Officer, entered into a Rule 10b5-1 trading arrangement intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) for the sale of up to 200,000 shares of the Company’s Class A common stock through August 31, 2026.
Name	Larry Madden
Title	Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 15, 2025
Expiration Date	August 31, 2026
Arrangement Duration	259 days
Aggregate Available	200,000	200,000

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Cybersecurity Risk Management and Strategy Disclosure	Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	We have developed and implemented a cybersecurity risk management program intended to protect the confidentiality, integrity, and availability of our critical systems and information. We use the CIS Critical Security Controls Version 8 (“CIS Controls”) as a framework to help guide the design and assessment of our cybersecurity risk management program. Reference to the CIS Controls does not imply that we meet any particular technical standards, specifications, or requirements, rather, we use the framework as a tool to inform our identification, assessment, and management of cybersecurity risks relevant to our business. Our cybersecurity risk management program operates under its own governance structure and includes established processes for identifying, monitoring, and reporting cybersecurity risks. The initial phase of the Company's enterprise risk management ("ERM") program has been completed and incorporates cybersecurity risk as part of the broader enterprise risk framework, alongside governance, process, technology, financial reporting, and fraud risks that could impact our financial statements. The Company continues to enhance and expand its ERM program to further integrate risk identification, assessment, and response activities across the enterprise on an ongoing basis. Key elements of our cybersecurity risk management program include, but are not limited to, the following: •risk assessments designed to identify material risks from cybersecurity threats to our critical systems and information; •a dedicated security team principally responsible for managing (1) our cybersecurity risk assessment processes, (2) our security controls, and (3) our response to cybersecurity incidents; •the use of external service providers, where appropriate, to assess, test or otherwise assist with aspects of our security controls; •cybersecurity awareness training of our employees, including incident response personnel and senior management; •a formal cybersecurity incident response plan that includes procedures for responding to cybersecurity incidents; and •a third-party risk management process that evaluates significant service providers, suppliers, and vendors for cybersecurity risks based on our assessment of their criticality to our operations and respective risk profile.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	The initial phase of the Company's enterprise risk management ("ERM") program has been completed and incorporates cybersecurity risk as part of the broader enterprise risk framework, alongside governance, process, technology, financial reporting, and fraud risks that could impact our financial statements. The Company continues
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Our board of directors (the "Board") considers cybersecurity risk as part of its risk oversight responsibilities. While primary oversight is delegated to the Audit Committee, the Board directly oversees management’s implementation of our cybersecurity risk management program.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Board receives regular reports from management on our cybersecurity risks. In addition, management updates the Board, where it deems appropriate, regarding any cybersecurity incidents it considers significant or potentially significant. Board members receive presentations on cybersecurity topics from our Chief Information Officer ("CIO").
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Board receives regular reports from management on our cybersecurity risks. In addition, management updates the Board, where it deems appropriate, regarding any cybersecurity incidents it considers significant or potentially significant. Board members receive presentations on cybersecurity topics from our Chief Information Officer ("CIO").
Cybersecurity Risk Role of Management [Text Block]	Our management team, including our CIO, is responsible for assessing and managing our material risks from cybersecurity threats. Our CIO has primary responsibility for our overall cybersecurity risk management program and supervises both our internal cybersecurity personnel and our retained external cybersecurity consultants. Our CIO's experience includes over twenty (20) years of design, implementation and management of cybersecurity programs at various levels and organizations. Management oversight of cybersecurity risks includes ongoing efforts to prevent, detect, mitigate, and remediate cybersecurity risks and incidents through various means. These efforts may include briefings from internal security personnel; threat intelligence and other information obtained from governmental, public or private sources, including external consultants engaged by us; and alerts, dashboards and reports generated by security tools deployed throughout our IT environment.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Our management team, including our CIO, is responsible for assessing and managing our material risks from cybersecurity threats.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our CIO's experience includes over twenty (20) years of design, implementation and management of cybersecurity programs at various levels and organizations.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Board receives regular reports from management on our cybersecurity risks. In addition, management updates the Board, where it deems appropriate, regarding any cybersecurity incidents it considers significant or potentially significant. Board members receive presentations on cybersecurity topics from our Chief Information Officer ("CIO").
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true