SCHEDULE 13G/A 0000902664-24-006456 0001230239 XXXXXXXX LIVE 1 Class A Common Stock, par value $0.0001 per share 03/31/2025 0001889956 OneStream, Inc. 68278B107 191 N. CHESTER STREET BIRMINGHAM MI 48009 Rule 13d-1(d) Alkeon Capital Management LLC DE 0.00 2526261.00 0.00 2526261.00 2526261.00 N 3.5 IA OO Panayotis D. Sparaggis X1 0.00 2526261.00 0.00 2526261.00 2526261.00 N 3.5 HC IN OneStream, Inc. 191 N. Chester Street, Birmingham, MI 48009 This statement is filed by: (1) Alkeon Capital Management LLC ("Alkeon"), a Delaware limited liability company and the investment manager to certain funds (the "Alkeon Funds"), with respect to the shares of class A common stock, par value $0.0001 per share ("Class A Common Stock") of OneStream, Inc. (the "Company") directly held by the Alkeon Funds; and (2) Panayotis D. Sparaggis ("Mr. Sparaggis"), the Founder and Managing Director of Alkeon, with respect to the shares of Class A Common Stock directly held by the Alkeon Funds. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities and Exchange Act of 1934, the beneficial owner of the shares of Class A Common Stock reported herein. The address of the business office of each of the Reporting Persons is 350 Madison Avenue, 20th Floor, New York, NY 10017. The Investment Manager is a Delaware limited liability company. Mr. Sparaggis is a citizen of the United States. Y The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 73,114,192 shares of Class A Common Stock outstanding as of February 24, 2025, as reported in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the Securities and Exchange Commission on February 27, 2025. 3.5% The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference. N Y N See Item 2. The Alkeon Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Class A Common Stock. Y Y Y Y Alkeon Capital Management LLC /s/ Jennifer Shufro 05/14/2025 Panayotis D. Sparaggis /s/ Panayotis D. Sparaggis 05/14/2025