264 institutions reported holding $2.23B of ONESTREAM INC (OS) in SEC 13F filings for 2026-03-31. Largest institutional holders: GLAZER CAPITAL, LLC ($180.9M), VANGUARD PORTFOLIO MANAGEMENT LLC ($117.6M), Temasek Holdings (Private) Ltd ($102.4M), FIL Ltd ($95.8M), VANGUARD CAPITAL MANAGEMENT LLC ($93.2M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GLAZER CAPITAL, LLC | $180.9M | 7.5M | New |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | $117.6M | 4.9M | New |
| 3 | Temasek Holdings (Private) Ltd | $102.4M | 4.3M | Hold |
| 4 | FIL Ltd | $95.8M | 4.0M | New |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $93.2M | 3.9M | New |
| 6 | AQR Arbitrage LLC | $81.4M | 3.4M | New |
| 7 | NEXPOINT ASSET MANAGEMENT, L.P. | $80.6M | 3.4M | New |
| 8 | O'Connor Alternative Investments LLC | $76.5M | 3.2M | New |
| 9 | Polar Asset Management Partners Inc. | $70.7M | 2.9M | New |
| 10 | MILLENNIUM MANAGEMENT LLC | $59.3M | 2.5M | Added |
| 11 | BlackRock, Inc. | $56.1M | 2.3M | Added |
| 12 | UBS Group AG | $54.2M | 2.3M | Added |
| 13 | Man Group plc | $52.9M | 2.2M | New |
| 14 | GOLDMAN SACHS GROUP INC | $47.7M | 2.0M | Added |
| 15 | CITADEL ADVISORS LLC | $45.9M | 1.9M | Trimmed |
| 16 | Pentwater Capital Management LP | $45.4M | 1.9M | New |
| 17 | First Trust Capital Management L.P. | $44.2M | 1.8M | New |
| 18 | SOROS FUND MANAGEMENT LLC | $43.9M | 1.8M | Added |
| 19 | TIG Advisors, LLC | $41.7M | 1.7M | New |
| 20 | MORGAN STANLEY | $39.6M | 1.7M | Added |
| 21 | HSBC HOLDINGS PLC | $38.3M | 1.6M | Added |
| 22 | JPMORGAN CHASE & CO | $35.2M | 1.5M | Added |
| 23 | ODDO BHF ASSET MANAGEMENT SAS | $34.8M | 1.4M | New |
| 24 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $29.6M | 1.2M | Added |
| 25 | ALLIANCEBERNSTEIN L.P. | $28.2M | 1.5M | New |
Source: SEC Form 13F filings · as of 2026-03-31