OS OneStream Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

OneStream, Inc.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing proxy statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

Your Vote Counts! ONESTREAM, INC. 2025 Annual Meeting Vote by May 19, 2025 11:59 PM ET ONESTREAM, INC. 191 N. CHESTER STREET BIRMINGHAM, MICHIGAN 48009 V68600-P26712 You invested in ONESTREAM, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on May 20, 2025. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 6, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Vote Virtually at the Meeting* May 20, 2025 9:00 am ET Smartphone users Point your camera here and vote without entering a control number Virtually at: www.virtualshareholdermeeting.com/OS2025 *Please check the meeting materials for any special requirements for meeting attendance. Your Vote Counts! ONESTREAM, INC. 2025 Annual Meeting Vote by May 19, 2025 11:59 PM ET ONESTREAM, INC. 191 N. CHESTER STREET BIRMINGHAM, MICHIGAN 48009 V68600-P26712 You invested in ONESTREAM, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on May 20, 2025. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 6, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Vote Virtually at the Meeting* May 20, 2025 9:00 am ET Smartphone users Point your camera here and vote without entering a control number Virtually at: www.virtualshareholdermeeting.com/OS2025 *Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items 1. Election of Class I Directors For All Nominees: 01) Thomas Shea 02) Bradley Brown 2. The ratification of the appointment of Ernst & Young LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2025. For NOTE: In their discretion, each proxy may also vote upon such other business as may properly come before the meeting or any adjournments or postponements thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V68601-P26712

Grafico Azioni OneStream (NASDAQ:OS)
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Da Mar 2025 a Apr 2025

Grafico Azioni OneStream (NASDAQ:OS)
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Da Apr 2024 a Apr 2025