OneStream, Inc. (OS) Institutional Ownership

Ownership Summary

Recent 13F filings as of December 2025 show that 174 institutional investors hold a position in OneStream, Inc. (NASDAQ:OS).

• Institutional ownership in OneStream edged down to 45.1% in December 2025, compared to 45.9% in September 2025.
• Quarterly data indicates a 4.48% shift in institutional share volume, and the annual owner count reflects an increase of 8.75%.
• During the quarter, 91 institutions bought more OneStream shares, 63 sold shares, and 20 of the 174 total investors held their position steady.
• The total number of shares held by institutions in OneStream increased to 77.67Mn as of December 2025, a net change of up by 3.33Mn shares quarter on quarter, and up 24.45Mn shares year over year.
• VANGUARD GROUP INC continues to be the largest institutional holder of OneStream as of December 31, 2025, with a position of 8.58Mn shares, representing 4.98% of the company's outstanding stock.
• Among the most significant buyers of OneStream during December 2025 were NORGES BANK (5.97Mn), FULLER & THALER ASSET MANAGEMENT, INC. (2.59Mn), CITADEL ADVISORS LLC (1.87Mn), MOORE CAPITAL MANAGEMENT, LP (1.20Mn), Tensile Capital Management LP (541.07K).
• Leading sellers of OneStream stock in December 2025 included T. Rowe Price Investment Management, Inc. (5.54Mn), KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC (1.34Mn), ROYAL BANK OF CANADA (982.14K), Champlain Investment Partners, LLC (769.68K), MILLENNIUM MANAGEMENT LLC (572.50K).
• The top 10 institutional holders of OneStream for the quarter ending December 2025 included VANGUARD GROUP INC (8.58Mn), NORGES BANK (5.97Mn), KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC (4.87Mn), Temasek Holdings (Private) Ltd (4.27Mn), DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP (3.84Mn), T. Rowe Price Investment Management, Inc. (3.84Mn), BROWN ADVISORY INC (3.38Mn), MARSHALL WACE, LLP (2.79Mn), TimesSquare Capital Management, LLC (2.67Mn), FULLER & THALER ASSET MANAGEMENT, INC. (2.59Mn).