# EDGAR Filing Document

**Accession Number:** 0001524362
**File Stem:** 0000921895-25-003407
**Filing Date:** 2025-12
**Character Count:** 60956
**Document Hash:** ba06cff0698156b61d044fd0dc679223
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000921895-25-003407.hdr.sgml**: 20251231

**ACCESSION NUMBER**: 0000921895-25-003407

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20251231

**DATE AS OF CHANGE**: 20251231

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ON24 INC.
- **CENTRAL INDEX KEY:** 0001110611
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-PREPACKAGED SOFTWARE [7372]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-93384
- **FILM NUMBER:** 251618082

**BUSINESS ADDRESS:**
- **STREET 1:** 301 HOWARD STREET, SUITE 1100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **BUSINESS PHONE:** (415) 369-8000

**MAIL ADDRESS:**
- **STREET 1:** 301 HOWARD STREET, SUITE 1100
- **CITY:** SAN FRANCISCO
- **STATE:** CA

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ON24 INC
- **DATE OF NAME CHANGE:** 20000329
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Indaba Capital Management, L.P.
- **CENTRAL INDEX KEY:** 0001524362

**ORGANIZATION NAME:**
- **EIN:** 271639439
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** ONE LETTERMAN DRIVE
- **STREET 2:** BUILDING D, SUITE DM700
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94129
- **BUSINESS PHONE:** (415) 680-1180

**MAIL ADDRESS:**
- **STREET 1:** ONE LETTERMAN DRIVE
- **STREET 2:** BUILDING D, SUITE DM700
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94129

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Indaba Capital Management, LLC
- **DATE OF NAME CHANGE:** 20110627

## Exhibit 99.1

Exhibit 99.1

***Execution Version***

**VOTING AND Support AGREEMENT**

This Voting and Support Agreement (this "<u>Agreement</u>") is made and entered into as of December 29, 2025, by and among Cvent Atlanta, LLC, a Delaware limited liability company ("<u>Parent</u>"), and Indaba Capital Management L.P., on behalf of the stockholders of ON24, Inc., a Delaware corporation (the "<u>Company</u>"), listed on <u>Schedule A</u> hereto (each, a "<u>Stockholder</u>" and, collectively, the "<u>Stockholders</u>").

**RECITALS**

WHEREAS, concurrently with the execution and delivery of this Agreement, Parent, Summit Sub Corp., a Delaware corporation and wholly owned subsidiary of Parent ("<u>Merger Sub</u>"), and the Company, are entering into an Agreement and Plan of Merger (as it may be amended, supplemented or otherwise modified from time to time, the "<u>Merger Agreement</u>") that, among other things and subject to the terms and conditions set forth therein, provides for the merger of Merger Sub with and into the Company (the "<u>Merger</u>"), with the Company as the surviving corporation;

WHEREAS, as of the date hereof, each Stockholder is the record and/or "beneficial owner" (within the meaning of Rule 13d-3 under the Exchange Act) of the number of shares of common stock, par value $0.0001 per share, of the Company (the "<u>Company Stock</u>") set forth next to such Stockholder's name on <u>Schedule A</u> hereto, being all of the shares of Company Stock owned of record or beneficially by such Stockholder as of the date hereof (with respect to such Stockholder, the "<u>Owned Shares</u>", and the Owned Shares together with any additional shares of Company Stock that such Stockholder may acquire record and/or beneficial ownership of after the date hereof, such Stockholder's "<u>Covered Shares</u>");

WHEREAS, the board of directors of the Company (the "<u>Company Board</u>") has unanimously (i) approved, adopted and declared advisable this Agreement and the transactions contemplated hereby, including the Merger, (ii) determined that the Merger Agreement and the transactions contemplated by the Merger Agreement, including the Merger, are in the best interests of the Company and Company Stockholders, (iii) resolved to recommend that the Company Stockholders adopt this Agreement in accordance with the DGCL (the "<u>Company Recommendation</u>") and (iv) directed that the adoption of the Merger Agreement be submitted for consideration by the Company's stockholders; and

WHEREAS, as an inducement and condition for Parent and Merger Sub to enter into the Merger Agreement, each Stockholder has agreed to enter into this Agreement with respect to such Stockholder's Covered Shares.

NOW, THEREFORE, in consideration of the foregoing and the respective representations, warranties, covenants and agreements set forth below and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, do hereby agree as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.<u>Definitions</u>. Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to such terms in the Merger Agreement. When used in this Agreement, the following terms shall have the meanings assigned to them in this <u>Section 1</u>.

"<u>Expiration Time</u>" shall mean the earliest to occur of (a) a Company Adverse Recommendation Change pursuant to Section 4.5(b) of the Merger Agreement, (b) the Effective Time, (c) such date and time as the Merger Agreement shall be validly terminated pursuant to Article VI thereof, (d) the written consent of the Stockholders, Parent and the Company, (e) an Adverse Amendment, or (f) January 1, 2027.

"<u>Transfer</u>" shall mean (a) any direct or indirect offer, sale, assignment, encumbrance, pledge, gift, assign, hedge, hypothecation, disposition, loan or other transfer, or entry into any option or other Contract, arrangement or understanding with respect to any offer, sale, assignment, encumbrance, pledge, hypothecation, disposition (whether by sale, liquidation, dissolution, dividend or distribution) or other transfer (by merger, consolidation, division, conversion, operation of Law or otherwise), of any Covered Shares or any interest in any Covered Shares (in each case other than this Agreement), (b) the deposit of such Covered Shares into a voting trust, the entry into a voting agreement or arrangement (other than this Agreement) with respect to such Covered Shares or the grant of any proxy or power of attorney with respect to such Covered Shares or (c) any Contract or commitment (whether or not in writing) to take any of the actions referred to in the foregoing clauses (a) or (b) above.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.<u>Agreement to Not Transfer the Covered Shares</u>. Until the Expiration Time, each Stockholder agrees not to Transfer or cause or permit the Transfer of any of such Stockholder's Covered Shares, other than with the prior written consent of Parent; <u>provided</u>*,* <u>however</u>, that any Stockholder may Transfer any such Covered Shares to (a) any other Stockholder or any Affiliate of any such Stockholder or (b) any beneficial owner of Stockholder, in each case only if the transferee of such Covered Shares evidences in a writing reasonably satisfactory to Parent such transferee's agreement to be bound by and subject to the terms and provisions hereof to the same effect as such transferring Stockholder. Any Transfer or attempted Transfer of any Covered Shares in violation of this <u>Section 2</u> shall be null and void and of no effect whatsoever. Each Stockholder agrees that it shall not, and shall cause each of its Affiliates not to, become a member of a "group" (as defined under Section 13(d) of the Exchange Act) with respect to any securities in the Company for the purpose of opposing or competing with or taking any actions inconsistent with the Merger or any of the other transactions contemplated by the Merger Agreement (the "<u>Transactions</u>"). For the avoidance of doubt, the fact that any Covered Shares are held in a margin account or pledged pursuant to the terms thereof shall not be deemed a breach or violation of any representation, warranty or covenant contained herein.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.<u>Agreement to Vote the Covered Shares</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.1Until the Expiration Time, at every meeting of the Company's stockholders at which any of the following matters are to be voted on (and at every adjournment or postponement thereof), and in connection with any action proposed to be taken by written consent of the Company Stockholders, each Stockholder shall vote (including via proxy) all of such Stockholder's Covered Shares owned as of the applicable record date and then entitled to vote (or direct the holder(s) of record on any applicable record date to vote (including via proxy) all of such Stockholder's Covered Shares), or deliver (or cause to be delivered) a written consent with respect to all of such Stockholder's Covered Shares:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)in favor of the adoption of the Merger Agreement and the Transactions,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)against the approval or adoption of any proposal made in opposition to, or in competition with, the Transactions;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)against any Acquisition Proposal or merger, consolidation, or business combination involving the Company or any of its Subsidiaries other than the Transactions;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)against any sale, lease, or transfer of all or substantially all of the assets of the Company or any of its Subsidiaries;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e)against any recapitalization, dissolution, liquidation or winding up of the Company or any of its Subsidiaries; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f)against any other action or series of actions that, individually or in the aggregate, could reasonably be expected to (i) result in a material breach of any of the representations, warranties, covenants or agreements set forth in this Agreement, (ii) result in any of the conditions to the consummation of the Merger set forth in Article V of the Merger Agreement not being fulfilled or satisfied in accordance with the terms thereof or (iii) otherwise prevent, materially delay, impair or materially and adversely affect the consummation of the Transactions in accordance with the terms of the Merger Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.2Until the Expiration Time, at every meeting of the Company's stockholders (and at every adjournment or postponement thereof), each Stockholder shall be represented in person or by proxy at such meeting (or cause the holder(s) of record on any applicable record date to be represented in person or by proxy at such meeting) in order for the Covered Shares to be counted as present for purposes of establishing a quorum.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.3Notwithstanding anything to the contrary in this Agreement, if at any time following the date hereof and prior to the Expiration Time a Governmental Body of competent jurisdiction enters an order restraining, enjoining or otherwise prohibiting the Stockholders from taking any action pursuant to <u>Section 3.1</u> or <u>Section 3.2</u> of this Agreement, then the obligations of each Stockholder set forth in <u>Section 3.1</u> or <u>Section 3.2</u> of this Agreement shall be of no force and effect for so long as such order is in effect solely to the extent such order restrains, enjoins or otherwise prohibits such Stockholder from taking any such action.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.4Notwithstanding anything herein to the contrary in this Agreement, <u>Section 3.1</u> or <u>Section 3.2</u> of this Agreement shall not require any Stockholder to be present (in person or by proxy) or vote (or cause to be voted) any of its Covered Shares to amend, modify or waive any provision of the Merger Agreement without the consent of such Stockholder in a manner that reduces the amount or changes the form of the Merger Consideration payable or imposes any express material restrictions on or express additional material conditions on the payment of the Merger Consideration (each of the foregoing, an "<u>Adverse Amendment</u>").

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.<u>Prior Proxies</u>. Each Stockholder hereby revokes (or agrees to cause to be revoked) any and all previous proxies granted with respect to the Covered Shares.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.<u>Waiver of Appraisal Rights and Certain Other Actions</u>. Each Stockholder hereby waives all appraisal rights under Section 262 of the DGCL with respect to all of such Stockholder's Covered Shares owned (beneficially or of record) by such Stockholder. In addition, each Stockholder hereby agrees not to commence or participate in, any class action with respect to, any legal action, derivative or otherwise, against Parent, the Company or any of their respective Subsidiaries or successors: (a) challenging the validity of, or seeking to enjoin or delay the operation of, any provision of this Agreement or the Merger Agreement (including any claim seeking to enjoin or delay the Closing) or (b) to the fullest extent permitted under applicable Law, alleging a breach of any duty of the Company Board (or any member thereof) or Parent in connection with the Merger Agreement, this Agreement or the transactions contemplated thereby or hereby.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.<u>Documentation and Information</u>. Except as required by applicable Law (including the filing of a Schedule 13D with the SEC which may include this Agreement as an exhibit thereto), each Stockholder shall not, and shall direct its Representatives not to, make any public announcement regarding this Agreement, the Merger Agreement or the transactions contemplated hereby or thereby without the prior written consent of Parent (such consent not to be unreasonably withheld). Each Stockholder consents to and hereby authorizes Parent and Merger Sub to publish and disclose in all documents and schedules filed with the SEC, and any press release or other disclosure document that Parent or Merger Sub reasonably determines to be necessary in connection with the Merger and any transactions contemplated by the Merger Agreement, such Stockholder's identity and ownership of the Covered Shares, the existence of this Agreement and the nature of such Stockholder's commitments and obligations under this Agreement, and each Stockholder acknowledges that Parent and Merger Sub may, in Parent's sole discretion, file this Agreement or a form hereof with the SEC or any other Governmental Body. Each Stockholder agrees to promptly give Parent any information it may reasonably require for the preparation of any such disclosure documents, and each Stockholder agrees to promptly notify Parent of any required corrections with respect to any written information supplied by it specifically for use in any such disclosure document, if and to the extent that such Stockholder shall become aware that any such information shall have become false or misleading in any material respect.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.<u>No Solicitation</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.1<u>No Solicitation or Negotiation</u>. Each Stockholder shall not and shall not authorize or permit any of its Representatives to, directly or indirectly, (a) initiate, seek or solicit, or knowingly encourage or facilitate (including by way of furnishing non-public information) or take any other action that is reasonably expected to promote, directly or indirectly, any inquiries or the making or submission of any proposal that constitutes, or would reasonably be expected to lead to, an Acquisition Proposal with respect to the Company; (b) participate or engage in discussions or negotiations with, or disclose any non-public information or data relating to the Company or any of its Subsidiaries or afford access to the properties, books or records of the Company or any of its Subsidiaries to any Person or group of Persons (or any of their Affiliates or Representatives) that has made an Acquisition Proposal with respect to the Company, (c) approve, recommend or enter into, or propose to approve or recommend to enter into, any agreement, including any letter of intent, memorandum of understanding, agreement in principle, merger agreement, acquisition agreement or other similar agreement, with respect to an Acquisition Proposal with respect to the Company (other than an Acceptable Confidentiality Agreement permitted pursuant to Section 4.5 of the Merger Agreement), or (d) resolve, publicly propose or agree to do any of the foregoing. Each Stockholder shall, and shall instruct its Representatives to, immediately upon the execution of this Agreement cause to be terminated any solicitation, encouragement, discussion or negotiation with or involving any Person or group of Persons, or any of their Affiliates (other than Parent and/or its Affiliates), conducted heretofore by each Stockholder or its Representatives, with respect to an Acquisition Proposal or which could reasonably be expected to lead to an Acquisition Proposal. Within two (2) Business Days from the date of this Agreement, each Stockholder shall request the return or destruction of all confidential, non-public information provided by such Stockholder to third parties in connection with the consideration of any Acquisition Proposal.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.2<u>Notice</u>. The parties agree that, as promptly as practicable after receipt thereof (and in any event, within one (1) Business Day), each Stockholder shall advise Parent in writing of any request for information or any Acquisition Proposal with respect to the Company received from any Person or group of Persons, or any request for information, inquiry, discussions or negotiations with respect to any Acquisition Proposal with respect to the Company, and the terms and conditions of such request, Acquisition Proposal, inquiry, discussions or negotiations, and each Stockholder shall promptly (and in any event, within one (1) Business Day) provide to Parent copies of any written materials received by such Stockholder in connection with any of the foregoing and the identity of the Person or group of Persons making any such request, Acquisition Proposal or inquiry or with whom any discussions or negotiations are taking place. Each Stockholder agrees that it shall simultaneously provide to Parent any non-public information concerning the Company or its Subsidiaries provided to any other Person or group of Persons in connection with any Acquisition Proposal which was not previously provided to Parent. Each Stockholder shall keep Parent fully informed of the status of any Acquisition Proposals (including the identity of the parties and price involved and any changes to any material terms and conditions thereof).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.<u>Fiduciary Duties</u>. Each Stockholder is entering into this Agreement solely in its, his or her capacity as the record holder or beneficial owner of such Stockholder's Covered Shares. Nothing in this Agreement shall in any way attempt to limit or affect any actions taken by any of such Stockholder's or its, his or her Affiliates' designee(s) or beneficial owner(s) serving on the Company Board or any such Stockholder or in his or her capacity as a director, officer or employee of the Company or any of its Affiliates, from complying with his or her fiduciary obligations while acting in such designee's or beneficial owner's capacity as a director, officer or employee of the Company. No action taken (or omitted to be taken) in any such capacity as a director, officer or employee shall be deemed to constitute a breach of this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.<u>Representations and Warranties of the Stockholders</u>. Each Stockholder hereby represents and warrants to Parent that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.1<u>Due Authority</u>. Such Stockholder has the full power and capacity to make, enter into and carry out the terms of this Agreement. To the extent such Stockholder is not an individual, such Stockholder is duly organized, validly existing and in good standing in accordance with the laws of its jurisdiction of formation, as applicable, and the execution and delivery of this Agreement, the performance of such Stockholder's obligations hereunder, and the consummation of the transactions contemplated hereby have been validly authorized, and, assuming the accuracy of the representations and warranties set forth in <u>Section 10.2(b)</u> of this Agreement, no other consents or authorizations are required to give effect to this Agreement or the transactions contemplated by this Agreement. This Agreement has been duly and validly executed and delivered by such Stockholder and constitutes a valid and binding obligation of such Stockholder enforceable against it in accordance with its terms, except as enforcement may be limited by applicable bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and other similar Laws affecting or relating to creditors' rights generally and equitable remedies of specific performance and injunctive and other forms of equitable relief may be subject to equitable defenses and to the discretion of the court before which any proceeding therefor may be brought.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.3<u>No Conflict; Consents</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)No consent, approval, order or authorization of, or registration, declaration or, except as required under the HSR Act, any competition, antitrust and investment laws or regulations of foreign jurisdictions or by the rules and regulations promulgated under the Exchange Act, filing with, any Governmental Body or any other Person, is required by or with respect to such Stockholder in connection with the execution and delivery of this Agreement or the consummation by such Stockholder of the transactions contemplated hereby.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.4<u>Absence of Litigation</u>. As of the date hereof, there is no legal action pending against, or, to the knowledge of such Stockholder, threatened against or affecting such Stockholder that would reasonably be expected to prevent, materially delay or materially impair the ability of such Stockholder to perform its, his or her obligations under this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.5<u>Reliance</u>. Such Stockholder has been represented by or had the opportunity to be represented by independent counsel of its own choosing and has had the right and opportunity to consult with its attorney, and to the extent, if any, that such Stockholder desired, such Stockholder availed itself of such right and opportunity. Such Stockholder understands and acknowledges that Parent and Merger Sub are entering into the Merger Agreement in reliance upon such Stockholder's execution, delivery and performance of this Agreement. Such Stockholder (individually and on behalf of its Affiliates (other than the Company and its Subsidiaries) and each of their respective Representatives) hereby agrees and acknowledges that, in entering into this Agreement and agreeing to consummate the transactions contemplated hereby and by the Merger Agreement, such Stockholder, its Affiliates and each of their respective Representatives are relying solely on the representations and warranties of Parent set forth in <u>Section 10</u> of this Agreement and are not relying on any other representation, warranty, statement or material.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.6<u>Brokers</u>. No broker, finder, financial advisor, investment banker or other Person is entitled to any brokerage, finder's, financial advisor's or other similar fee or commission payable by the Company or any of its Subsidiaries in connection with the transactions contemplated hereby based upon arrangements made by or, to the knowledge of such Stockholder, on behalf of such Stockholder.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.<u>Representations and Warranties of Parent</u>. Parent hereby represents and warrants to the Stockholders that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.1<u>Due Authority</u>. Parent has the full power and capacity to make, enter into and carry out the terms of this Agreement. Parent is duly organized, validly existing and in good standing in accordance with the laws of its jurisdiction of formation. The execution and delivery of this Agreement, the performance of Parent's obligations hereunder, and the consummation of the transactions contemplated hereby has been validly authorized, and assuming the accuracy of the representations and warranties set forth in <u>Section 9.3(b)</u> of this Agreement, no other consents or authorizations are required to give effect to this Agreement or the transactions contemplated by this Agreement. This Agreement has been duly and validly executed and delivered by Parent and constitutes a valid and binding obligation of Parent enforceable against it in accordance with its terms, except as enforcement may be limited by general principles of equity whether applied in a court of law or a court of equity and by bankruptcy, insolvency and similar Laws affecting creditors' rights and remedies generally.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.2<u>No Conflict; Consents</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)No consent, approval, order or authorization of, or registration, declaration or, except as required under the HSR Act, any competition, antitrust and investment laws or regulations of foreign jurisdictions or by the rules and regulations promulgated under the Exchange Act, filing with, any Governmental Body or any other Person, is required by or with respect to Parent in connection with the execution and delivery of this Agreement or the consummation by Parent of the transactions contemplated hereby.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.3<u>Absence of Litigation</u>. As of the date hereof, there is no legal action pending against, or, to the knowledge of Parent, threatened against or affecting Parent that would reasonably be expected to prevent, materially delay or materially impair the ability of Parent to perform its obligations under this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.<u>Miscellaneous</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.1<u>No Ownership Interest</u>. Nothing contained in this Agreement shall be deemed to vest in Parent any direct or indirect ownership or incidence of ownership of or with respect to the Covered Shares. All rights, ownership and economic benefits of and relating to the Covered Shares shall remain vested in and belong to the Stockholders, and Parent shall have no authority to direct any Stockholder in the voting or disposition of any of the Covered Shares, except as otherwise provided herein.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.2<u>Certain Adjustments</u>. In the event of a stock split, stock dividend or distribution, or any change in the Company Stock by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, exchange of shares or the like, the terms "Company Stock" and "Covered Shares" shall be deemed to refer to and include such shares as well as all such stock dividends and distributions and any securities into which or for which any or all of such shares may be changed or exchanged or which are received in such transaction.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.3<u>Amendments and Modifications</u>. This Agreement may not be modified, amended, altered or supplemented except upon the execution and delivery of a written agreement executed by all of the parties hereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.4<u>Expenses</u>. All costs and expenses incurred in connection with this Agreement shall be paid by the party incurring such cost or expense.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.5<u>Notices</u>. All notices and other communications hereunder shall be in writing and shall be deemed given if delivered personally, by email (with confirmation of receipt) or sent by a nationally recognized overnight courier service, such as Federal Express, to the parties at the following addresses (or at such other address for a party as shall be specified by like notice made pursuant to this <u>Section 11.5</u>):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) if to the Stockholders, to:

Indaba Capital Management, L.P. One Letterman Drive Building D, Suite DM 700 San Francisco, CA 94129 <br> Attention: Derek Schrier <br> Email: [\*\*\*]

with a copy (which shall not constitute notice) to:

Olshan Frome Wolosky LLP 1325 Avenue of the Americas New York, NY 10019 <br> Attention: Ryan Nebel Dorothy M. Sluszka <br> Email: [\*\*\*] [\*\*\*]

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) if to Parent, to:

Cvent Atlanta, LLC c/o Cvent, Inc. 1765 Greensboro Station Place, 7<sup>th</sup> Floor Tysons Corner, Virginia 22102 <br> Attention: Jeannette Koonce <br> Email: [\*\*\*]

with a copy (which shall not constitute notice) to:

Simpson Thacher & Bartlett LLP 425 Lexington Avenue New York, NY 10017 <br> Attention: William J. Allen <br> Email: [\*\*\*]

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) if to Company, to:

ON24, Inc. 301 Howard Street, Suite 1100 San Francisco, CA 94105 <br> Attention: General Counsel <br> Email: [\*\*\*]

with a copy (which shall not constitute notice) to:

DLA Piper LLP (US) 3203 Hanover Street, Suite 100 Palo Alto, CA 94304-1123 <br> Attention: Eric H. Wang Andrew Ledbetter <br> Email: [\*\*\*] [\*\*\*]

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.6<u>Enforcement</u>. The rights and remedies of the parties shall be cumulative with and not exclusive of any other remedy conferred hereby. The parties agree that irreparable damage would occur and that the parties would not have any adequate remedy at law in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties hereto shall be entitled to an injunction or injunctions to prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement, this being in addition to any other remedy to which they are entitled at law or in equity.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.7<u>Documentation and Information</u>. Each Stockholder consents to and authorizes the publication and disclosure by Parent and the Company of such Stockholder's identity and holding of the Covered Shares, and the terms of this Agreement (including, for the avoidance of doubt, the disclosure of this Agreement), in any press release, the Proxy Statement and any other disclosure document required in connection with the Merger Agreement, the Merger and the Transactions. Notwithstanding the foregoing, Parent and the Company will submit to Stockholder all written press releases, public filings, public announcements, or other communications with any news media made by Parent or the Company that contain the Stockholder's name in such Stockholder's capacity as a stockholder of the Company at least two (2) Business Days (or as soon as reasonably practicable) before the public disclosure of such information unless not feasible pursuant to applicable Law, and will reasonably consider Stockholder's input with respect to such disclosure concerning the Stockholder.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.8<u>Further Assurances</u>. Each Stockholder agrees, from time to time, at the reasonable request of Parent and without further consideration, to execute and deliver such additional documents and take all such further reasonable action as may be reasonably required to consummate and make effective, in the most expeditious manner practicable, the transactions contemplated by this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.9<u>Entire Agreement</u>. This Agreement constitutes the entire agreement and supersedes all prior agreements and understandings, both written and oral, among the parties with respect to the subject matter hereof. For the avoidance of doubt, nothing in this Agreement shall be deemed to amend, alter or modify, in any respect, any of the provisions of the Merger Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.10<u>Reliance</u>. Each Stockholder understands and acknowledges that Parent and Merger Sub are entering into the Merger Agreement in reliance upon such Stockholder's execution and delivery of this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.11<u>Construction</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)The words "this Agreement" "hereof", "herein" and "hereunder" and words of like import used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. The descriptive headings used herein are inserted for convenience of reference only and are not intend All references in this Agreement to Exhibits, Annexes, Schedules, Articles, Sections, subsections and other subdivisions refer to the corresponding Exhibits, Annexes, Schedules, Articles, Sections, subsections and other subdivisions of or to this Agreement unless expressly provided otherwise. Titles appearing at the beginning of any Articles, Sections, subsections or other subdivisions of this Agreement are for convenience only, do not constitute any part of this Agreement, and will be disregarded in construing the language hereof. All references in this Agreement to "days" refer to "calendar days" unless otherwise specified.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)Exhibits, Annexes and Schedules to this Agreement are attached hereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)The words "this Article," "this Section" and "this subsection," and words of similar import, refer only to the Article, Section or subsection hereof in which such words occur. The words "either," "or," "neither," "nor" and "any" are not exclusive. The word "including" (in its various forms) means including without limitation. The word "extent" in the phrase "to the extent" shall mean the degree to which a subject or other thing extends, and such phrase shall not mean simply "if." All references to "$" and "dollars" shall be deemed to refer to U.S. currency unless otherwise specifically provided.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)Any definition of or reference to any agreement, instrument or other document or any Law in this Agreement shall be construed as referring to such agreement, instrument or other document or Law as from time to time amended, supplemented or otherwise modified.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e)Pronouns in masculine, feminine or neuter genders shall be construed to state and include any other gender, and words, terms and titles (including terms defined herein) in the singular form shall be construed to include the plural and vice versa, unless the context otherwise requires.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f)The parties hereto agree that any rule of construction to the effect that ambiguities are to be resolved against the drafting party shall not be applied in the construction or interpretation of this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g)The representations, warranties and covenants of the Stockholders hereunder are made severally, solely with respect to each Stockholder, and not on a joint and several basis among the Stockholders.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.12<u>Assignment</u>. This Agreement shall be binding upon, and shall be enforceable by and inure solely to the benefit of, the parties hereto and their respective successors and permitted assigns. Except as permitted by <u>Section 2</u>, neither this Agreement nor any rights, interests or obligations hereunder may be assigned by any party hereto without the prior written consent of all other parties hereto. Any attempted assignment of this Agreement or any of such rights, interests or obligations without such consent shall be void and of no effect.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.13<u>Severability</u>. Any term or provision of this Agreement that is invalid or unenforceable in any situation in any jurisdiction shall not affect the validity or enforceability of the remaining terms and provisions of this Agreement or the validity or enforceability of the offending term or provision in any other situation or in any other jurisdiction. If a final judgment of a court of competent jurisdiction declares that any term or provision of this Agreement is invalid or unenforceable, the parties hereto agree that the court making such determination shall have the power to limit such term or provision, to delete specific words or phrases or to replace such term or provision with a term or provision that is valid and enforceable and that comes closest to expressing the intention of the invalid or unenforceable term or provision, and this Agreement shall be valid and enforceable as so modified. In the event such court does not exercise the power granted to it in the prior sentence, the parties hereto agree to replace such invalid or unenforceable term or provision with a valid and enforceable term or provision that will achieve, to the extent possible, the economic, business and other purposes of such invalid or unenforceable term or provision.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.14<u>Counterparts; Signatures</u>. This Agreement may be executed in two (2) or more counterparts, each of which shall be deemed an original but all of which together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each of the parties hereto and delivered to the other parties, it being understood that all parties need not sign the same counterpart. This Agreement may be executed and delivered by facsimile transmission, by electronic mail in "portable document format" (".pdf") form, or by any other electronic means intended to preserve the original graphic and pictorial appearance of a document, or by combination of such means.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.15<u>Applicable Law; Jurisdiction</u>. This Agreement and all actions (whether at law, in contract, in tort or otherwise) arising out of or relating to this Agreement, the negotiation, validity or performance of this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, regardless of the laws that might otherwise govern under applicable principles of conflicts of laws. All actions and proceedings (whether at law, in contract, in tort or otherwise) arising out of or relating to this Agreement, the negotiation, validity or performance of this Agreement shall be heard and determined in the Court of Chancery of the State of Delaware, and the parties irrevocably submit to the jurisdiction of such court (and, in the case of appeals, the appropriate appellate court therefrom), in any such action or proceeding and irrevocably waive the defense of an inconvenient forum to the maintenance of any such action or proceeding. The consents to jurisdiction set forth in this paragraph shall not constitute general consents to service of process in the State of Delaware and shall have no effect for any purpose except as provided in this paragraph and shall not be deemed to confer rights on any Person other than the parties hereto. The parties agree that service of any court paper may be made in any manner as may be provided under the applicable Laws or court rules governing service of process in such court. The parties hereto agree that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by applicable Law. EACH OF THE PARTIES HERETO IRREVOCABLY WAIVES ANY AND ALL RIGHTS TO TRIAL BY JURY IN ANY LEGAL PROCEEDING (WHETHER AT LAW, IN CONTRACT, IN TORT OR OTHERWISE) ARISING OUT OF OR RELATED TO THIS AGREEMENT.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.16<u>Non-Survival of Representations and Warranties</u>. None of the representations and warranties in this Agreement or in any schedule, instrument or other document delivered pursuant to this Agreement shall survive the Effective Time or the termination of this Agreement. This <u>Section 11.16</u> shall not limit any covenant or agreement contained in this Agreement that by its terms is to be performed in whole or in part after the Effective Time or the termination of this Agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.17<u>Termination</u>. This Agreement shall automatically terminate without further action by any of the parties hereto and shall have no further force or effect as of the Expiration Time; <u>provided</u> that the provisions of this <u>Section 11</u> shall survive any such termination. Notwithstanding the foregoing, termination of this Agreement shall not prevent any party hereto from seeking any remedies (at law or in equity) against any other party for that party's breach of any of the terms of this Agreement prior to the date of termination.

*[Signature page follows]*

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed and delivered as of the date first above written.

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**CVENT ATLANTA, LLC** | &nbsp;&nbsp;**CVENT ATLANTA, LLC** | &nbsp;&nbsp;**CVENT ATLANTA, LLC** |
| &nbsp;&nbsp;By: | &nbsp;&nbsp; /s/ Rajeev K. Aggarwal | &nbsp;&nbsp; /s/ Rajeev K. Aggarwal |
|  | &nbsp;&nbsp;Name: | &nbsp;&nbsp;Rajeev K. Aggarwal |
|  | &nbsp;&nbsp;Title: | &nbsp;&nbsp;President & Chief Executive Officer |

---

[Signature Page to Voting and Support Agreement]

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;**INDABA CAPITAL MANAGEMENT, L.P.** | &nbsp;&nbsp;**INDABA CAPITAL MANAGEMENT, L.P.** | &nbsp;&nbsp;**INDABA CAPITAL MANAGEMENT, L.P.** |
| &nbsp;&nbsp;By: | &nbsp;&nbsp; /s/ Derek Schrier | &nbsp;&nbsp; /s/ Derek Schrier |
|  | &nbsp;&nbsp;Name: | &nbsp;&nbsp;Derek Schrier |
|  | &nbsp;&nbsp;Title: | &nbsp;&nbsp;Managing Partner |

---

[Signature Page to Voting and Support Agreement]

**<u>Schedule A</u>**

Stockholder <u>Shares of Company Stock</u> <br> <u>Indaba Capital Fund, L.P.</u> <u>4,240,256</u>

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 5)**

**ON24 INC.**

*(Name of Issuer)*

**Common Stock, par value $0.0001 per share**

*(Title of Class of Securities)*

**68339B104**

*(CUSIP Number)*

**Zac Rosenberg**<br>Indaba Capital Management, L.P.<br>One Letterman Drive, BLDG D, Suite DM700<br>San Francisco CA 94129<br>415-680-1030

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**12/29/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **68339B104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Indaba Capital Management, L.P.** | Name of reporting person<br>**Indaba Capital Management, L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**4240256.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**4240256.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**4240256.00** | Aggregate amount beneficially owned by each reporting person<br>**4240256.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**10.0%** | Percent of class represented by amount in Row (11)<br>**10.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IA** | Type of Reporting Person (See Instructions)<br>**IA** | |

---

**Comment for Reporting Person:** Based on 42,282,395 shares of common stock of ON24, Inc. (the "Issuer") outstanding as of November 3, 2025, as reported in the Issuer's Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on November 10, 2025.

| **CUSIP No.** | **68339B104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**IC GP, LLC** | Name of reporting person<br>**IC GP, LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**4240256.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**4240256.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**4240256.00** | Aggregate amount beneficially owned by each reporting person<br>**4240256.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**10.0%** | Percent of class represented by amount in Row (11)<br>**10.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Based on 42,282,395 shares of common stock of the Issuer outstanding as of November 3, 2025, as reported in the Issuer's Form 10-Q filed with the SEC on November 10, 2025.

| **CUSIP No.** | **68339B104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SCHRIER DEREK C** | Name of reporting person<br>**SCHRIER DEREK C** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**4240256.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**4240256.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**4240256.00** | Aggregate amount beneficially owned by each reporting person<br>**4240256.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**10.0%** | Percent of class represented by amount in Row (11)<br>**10.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Based on 42,282,395 shares of common stock of the Issuer outstanding as of November 3, 2025, as reported in the Issuer's Form 10-Q filed with the SEC on November 10, 2025.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.0001 per share

**(b) Name of Issuer:**
ON24 INC.

**(c) Address of Issuer's Principal Executive Offices:**
301 HOWARD STREET, SUITE 1100, SAN FRANCISCO, CA, 94105

The following constitutes Amendment No. 5 ("Amendment No. 5") to the Schedule 13D filed with the SEC by Indaba Capital Management, L.P. (the "Investment Manager"), IC GP, LLC ("IC GP") and Derek C. Schrier (collectively, "Indaba" or the "Reporting Persons") on December 20, 2022, as amended by Amendment No. 1 filed on March 13, 2023, Amendment No. 2 filed on January 18, 2024, Amendment No. 3 filed on February 26, 2024, and Amendment No. 4 filed on March 19, 2025. This Amendment No. 5 amends and restates the Schedule 13D as specifically set forth herein.

All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Schedule 13D, as amended. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable.

**Item 4. Purpose of Transaction**

Item 4 of the Schedule 13D is hereby supplemented as follows:

On December 29, 2025, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") with Cvent Atlanta, LLC, a Delaware limited liability company ("Parent"), and Summit Sub Corp., a Delaware corporation and wholly-owned subsidiary of Parent ("Merger Sub"). Parent and Merger Sub are affiliated with Cvent, Inc. and have agreed to acquire all of the Issuer's outstanding shares of common stock for $8.10 per share, in cash. Pursuant to and subject to the terms of the Merger Agreement, Merger Sub will merge with and into the Issuer (the "Merger"), with the Issuer continuing as the surviving company and wholly-owned subsidiary of Parent following the proposed transaction, as more fully described in the Form 8-K filed by the Issuer with the SEC on December 30, 2025.

Concurrently with the execution of the Merger Agreement, Indaba and certain other parties entered into separate voting and support agreements (each, a "Voting and Support Agreement") with Parent. Pursuant to the Voting and Support Agreement, Indaba agreed, among other things, to (i) vote or cause to be voted all of its shares of common stock of the Issuer in favor of the Merger and the transactions contemplated by the Merger Agreement and (ii) prior to the Expiration Time (as defined in the Voting and Support Agreement) and subject to limited exceptions, not to sell or otherwise transfer any of its shares of common stock other than with the consent of Parent. The Voting and Support Agreement terminates in certain circumstances, including, among others, upon a Company Adverse Recommendation Change (as defined in the Merger Agreement) and by written consent of Parent, the Issuer and each stockholder party thereto.

The foregoing description of the Voting and Support Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Voting and Support Agreement, which is attached hereto as Exhibit 99.1.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

Item 6 of the Schedule 13D is hereby supplemented to add the following:

On December 29, 2025, Indaba and Parent entered into the Voting and Support Agreement as defined and described in Item 4 above.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Indaba Capital Management, L.P.

**Signature:** /s/ Derek C. Schrier

**Name/Title:** Derek C. Schrier, Managing Member of IC GP, LLC, its general partner

**Date:** 12/31/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** IC GP, LLC

**Signature:** /s/ Derek C. Schrier

**Name/Title:** Derek C. Schrier, Managing Member

**Date:** 12/31/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** SCHRIER DEREK C

**Signature:** /s/ Derek C. Schrier

**Name/Title:** Derek C. Schrier

**Date:** 12/31/2025