(1)Excludes non-cancelable recognized purchase commitments related to software license fees of $3.3 million that are included in accrued liabilities, accounts payable and other long-term liabilities in the condensed consolidated balance sheets.

The Company has agreed to indemnify its directors and executive officers for costs associated with any fees, expenses, judgments, fines, and settlement amounts incurred by any of these persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a director or officer, including any action by the Company, arising out of that person’s services as the Company’s director or officer or that person’s services provided to any other company or enterprise at the Company’s request. The Company maintains director and officer insurance coverage that may enable the Company to recover a portion of any future amounts paid.

FASB ASC 450-20, Contingencies, sets forth the rules for accounting for uncertain tax positions for taxes not based on income. When a loss contingency exists, the likelihood of the incurrence of the liability can range from probable to remote. The Company believes it is reasonably possible that a loss will result from the sales and use tax assessments in the range of zero to $0.5 million. The Company has not recorded an accrual as of March 31, 2025 and December 31, 2024.

The Company, its Chief Executive Officer, its Chief Financial Officer, certain current and former members of its Board of Directors and the underwriters that participated in the Company’s Initial Public Offering (“IPO”) are named as defendants in a consolidated putative class action, captioned In re ON24, Inc. Securities Litigation, 4:21-cv-08578-YGR (filed in November 2021), in the United States District Court for the Northern District of California. The consolidated complaint purports to assert claims under Sections 11 and 15 of the Securities Act of 1933 on behalf of all persons and entities that purchased, or otherwise acquired, the Company’s common stock issued in connection with its IPO. The complaint alleges that the Company’s registration statement and prospectus contained untrue statements of material fact and/or omitted material facts about ON24’s growth and customer base. Plaintiff seeks, among other things, an award of damages and attorneys’ fees and

costs. The defendants filed a motion to dismiss the complaint in May 2022, which the district court granted with leave to amend in July 2023. Plaintiff filed its amended complaint in September 2023, and the defendants filed a motion to dismiss the amended complaint in October 2023. In March 2024, the district court granted the defendants’ motion to dismiss with prejudice. The plaintiff has filed a notice of appeal of the district court’s order and that appeal is currently ongoing. The Company believes the allegations in the amended complaint are without merit. The Company is unable to reasonably estimate a possible loss or range of possible loss, if any, arising from this matter at this early stage. Accordingly, no accrued litigation expense has been recorded in the accompanying condensed consolidated financial statements.

In the ordinary course of business, the Company may be subject from time to time to various proceedings, lawsuits, disputes or claims. Although the Company cannot predict with assurance the outcome of any litigation, the Company does not believe there are currently any actions, other than those described in the prior paragraph, that if resolved unfavorably, would have a material impact on its financial condition, results of operations or cash flows.