OneStream, Inc. (OS) Institutional Ownership

Ownership Summary

The institutional landscape for OneStream, Inc. (NASDAQ:OS) includes 183 filers as of the latest reporting cycle ending September 2025.

• The collective stake of institutional investors in OneStream moved to 32.6% in September 2025, a shift down from the 35.9% reported for June 2025.
• In percentage terms, this reflects as a holdings change of 3.01% quarter on quarter, and an increase of 61.95% year over year.
• Of these 183 institutional investors, 99 increased their holdings in OneStream, while 64 of them reduced positions, and 20 investors maintained their exposure.
• The total number of shares held by institutions in OneStream increased to 79.15Mn as of September 2025, a net change of up by 2.31Mn shares quarter on quarter, and down 62.33Mn shares year over year.
• T. Rowe Price Investment Management, Inc. continues to be the largest institutional holder of OneStream as of September 30, 2025, with a position of 9.38Mn shares, representing 3.86% of the company's outstanding stock.
• Among the most significant buyers of OneStream during September 2025 were Temasek Holdings (Private) Ltd (1.31Mn), WELLINGTON MANAGEMENT GROUP LLP (1.26Mn), BROWN ADVISORY INC (1.04Mn), VANGUARD GROUP INC (786.41K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (564.97K).
• Leading sellers of OneStream stock in September 2025 included GOLDMAN SACHS GROUP INC (2.96Mn), Champlain Investment Partners, LLC (888.76K), KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC (663.13K), AMERICAN CENTURY COMPANIES INC (506.94K), Alyeska Investment Group, L.P. (474.46K).
• The top 10 institutional holders of OneStream for the quarter ending September 2025 included T. Rowe Price Investment Management, Inc. (9.38Mn), VANGUARD GROUP INC (8.61Mn), KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC (6.21Mn), Temasek Holdings (Private) Ltd (4.27Mn), DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP (3.84Mn), BROWN ADVISORY INC (3.65Mn), Champlain Investment Partners, LLC (2.89Mn), ALLIANCEBERNSTEIN L.P. (2.66Mn), TimesSquare Capital Management, LLC (2.55Mn), MARSHALL WACE, LLP (2.48Mn).