OneStream, Inc. (OS) Institutional Ownership

Ownership Summary

OneStream, Inc. (NASDAQ:OS) has 177 institutional investors with active 13F positions as of December 2025.

• They owned 47.3% of outstanding stock in December 2025, up from 42.7% the prior quarter.
• Their total shares held in OS increased 17.79% from the prior quarter, while the number of investors in OneStream increased 10.62% year over year.
• During the quarter, 94 of these 177 funds increased positions in OS, 62 reduced exposure, and 21 held steady.
• Altogether, these fund groups held 88.25Mn shares in OS by December 2025, up by 13.33Mn shares quarter on quarter, and with no net change year over year.
• T. Rowe Price Investment Management, Inc. holds the largest position in OS at 11.62Mn shares as of December 31, 2025, or 6.23% of shares outstanding.
• The biggest buyers of OneStream for the quarter ending December 2025 included NORGES BANK (5.97Mn), FULLER & THALER ASSET MANAGEMENT, INC. (5.18Mn), T. Rowe Price Investment Management, Inc. (2.24Mn), CITADEL ADVISORS LLC (1.87Mn), MOORE CAPITAL MANAGEMENT, LP (1.2Mn).
• Leading sellers of OneStream shares for the quarter ending December 2025 were KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC (1.34Mn), Royal Bank Of Canada (982.14K), Bank Of America Corp /De/ (876.98K), Champlain Investment Partners, LLC (769.68K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (450.26K).
• According to Business Quant data, leading holders of OS for December 2025 are T. Rowe Price Investment Management, Inc. (11.62Mn), VANGUARD GROUP INC (8.58Mn), NORGES BANK (5.97Mn), FULLER & THALER ASSET MANAGEMENT, INC. (5.18Mn), KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC (4.87Mn), Temasek Holdings (Private) Ltd (4.27Mn), DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP (3.84Mn), BROWN ADVISORY INC (3.38Mn), MARSHALL WACE, LLP (2.79Mn), TimesSquare Capital Management, LLC (2.67Mn).