Latest Period
Q1 2026
Security Snapshot
OneStream, Inc. - Common Stock (OS) Institutional Ownership
CUSIP: 68278B107
13F Institutional Holders and Ownership History from Q3 2024 to Q1 2026
Institutions Reporting
178
Shares (Excl. Options)
93,021,168
Price
$24.00
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- Security type / class
- Equity / Common Stock
- Symbol
- OS
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 93,021,168
- Total 13F value
- $2,223,898,553
- Portfolio coverage rank
- 0.01%
- Share change
- +6,932,686
- Value change
- +$403,446,893
- Number of holders
- 178
- Shares outstanding
- 90,458,291
- SEC-reported price per share
- $24.00
- Insider filing price
- $24.00
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- OS - OneStream, Inc. - Common Stock is tracked under CUSIP 68278B107.
- 178 institutions reported positions in Q1 2026.
- 12 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 182 to 178 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $1,507,270,986 to $2,223,898,553.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 178 institutions filings for Q1 2026.
Security key
68278B107
Latest holder period
Q1 2026
13F holders
178
13D/G owners
12
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 68278B107:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
12
Security
OS
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| KKR Dream Holdings LLC | 68% | $2,012,335,739 | 94,520,232 | KKR Group Partnership L.P. | 31 Dec 2024 | |||
| Shea Thomas Anthony | 16% | $429,252,378 | 18,173,259 | Thomas Anthony Shea | 31 Dec 2025 | |||
| Colby Craig | 11% | $194,351,364 | 9,128,763 | Craig Colby | 31 Mar 2025 | |||
| T. Rowe Price Investment Management, Inc. | 8.6% | -25% | $183,749,735 | +$61,226,748 | 7,779,413 | +50% | T. Rowe Price Investment Management, Inc. | 31 Dec 2025 |
| GLAZER CAPITAL, LLC | 6.8% | $145,650,510 | 6,166,406 | Glazer Capital, LLC | 02 Feb 2026 | |||
| NORGES BANK | 6.6% | -31% | $109,802,653 | -$47,048,058 | 5,974,029 | -30% | Norges Bank | 31 Dec 2025 |
| KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC | 5.4% | -23% | $114,974,767 | -$31,752,201 | 4,867,687 | -22% | Kayne Anderson Rudnick Investment Management, LLC | 31 Dec 2025 |
| DARLINGTON PARTNERS CAPITAL MANAGEMENT, LP | 5.3% | $81,740,932 | 3,839,405 | Darlington Partners Capital Management, LP | 11 Mar 2025 | |||
| Champlain Investment Partners, LLC | 3.3% | -37% | $68,172,800 | -$27,195,194 | 2,886,232 | -29% | Champlain Investment Partners, LLC | 30 Sep 2025 |
| ALLIANCEBERNSTEIN L.P. | 3.9% | -30% | $60,618,591 | +$8,124,285 | 2,847,280 | +15% | AllianceBernstein L.P. | 31 Mar 2025 |
| ALKEON CAPITAL MANAGEMENT LLC | 3.5% | $53,784,097 | 2,526,261 | Alkeon Capital Management LLC | 31 Mar 2025 | |||
| Koefoed William A | 3.8% | $43,673,965 | 2,051,384 | William A. Koefoed | 31 Dec 2024 |
As of 31 Mar 2026, 178 institutional investors reported holding 93,021,168 shares of OneStream, Inc. - Common Stock (OS). This represents 103% of the company’s total 90,458,291 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
74%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| GLAZER CAPITAL, LLC | 8.3% | 7,537,536 | 3.9% | $180,901,000 | |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.4% | 4,900,450 | 0% | 0.01% | $117,610,800 |
| Temasek Holdings (Private) Ltd | 4.7% | 4,266,714 | 0% | 0.34% | $102,401,136 |
| FIL Ltd | 4.4% | 3,992,145 | 0.07% | $95,811,480 | |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.3% | 3,882,231 | 0% | 0% | $93,173,544 |
| AQR Arbitrage LLC | 3.8% | 3,393,367 | 1.3% | $81,440,808 | |
| NEXPOINT ASSET MANAGEMENT, L.P. | 3.7% | 3,358,217 | 5.6% | $80,597,208 | |
| O'Connor Alternative Investments LLC | 3.5% | 3,186,804 | 0% | 6.7% | $76,483,296 |
| Polar Asset Management Partners Inc. | 3.3% | 2,944,378 | 1.7% | $70,665,072 | |
| MILLENNIUM MANAGEMENT LLC | 2.7% | 2,471,107 | +636% | 0.04% | $59,306,568 |
| BlackRock, Inc. | 2.6% | 2,339,550 | +11% | 0% | $56,149,200 |
| UBS Group AG | 2.5% | 2,257,069 | +372% | 0.01% | $54,169,656 |
| Man Group plc | 2.4% | 2,204,520 | 0.11% | $52,908,480 | |
| GOLDMAN SACHS GROUP INC | 2.2% | 1,985,820 | +182% | 0.01% | $47,659,680 |
| CITADEL ADVISORS LLC | 2.1% | 1,890,118 | -17% | 0.03% | $45,362,832 |
| Pentwater Capital Management LP | 2.1% | 1,890,000 | 0.32% | $45,360,000 | |
| First Trust Capital Management L.P. | 2% | 1,842,189 | 2.3% | $44,212,536 | |
| SOROS FUND MANAGEMENT LLC | 2% | 1,830,222 | +455% | 0.6% | $43,925,328 |
| TIG Advisors, LLC | 1.9% | 1,738,231 | 2% | $41,717,544 | |
| MORGAN STANLEY | 1.8% | 1,651,031 | +75% | 0% | $39,624,744 |
| HSBC HOLDINGS PLC | 1.8% | 1,595,839 | +3943% | 0.02% | $38,300,136 |
| ALLIANCEBERNSTEIN L.P. | 1.7% | 1,535,061 | 0.01% | $28,214,421 | |
| JPMORGAN CHASE & CO | 1.6% | 1,467,884 | +416% | 0% | $35,229,216 |
| ODDO BHF ASSET MANAGEMENT SAS | 1.6% | 1,450,000 | 1.4% | $34,800,000 | |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 1.4% | 1,234,961 | +106% | 0.05% | $29,639,064 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
7
Latest
Q1 2026
Rows shown
1-7 of 7
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 93,021,168 | $2,223,898,553 | +$403,446,893 | $24.00 | 178 |
| 2025 Q4 | 82,000,055 | $1,507,270,986 | +$63,787,510 | $18.38 | 182 |
| 2025 Q3 | 78,686,384 | $1,450,200,850 | -$247,394,073 | $18.43 | 181 |
| 2025 Q2 | 87,102,837 | $2,464,752,865 | +$660,992,272 | $28.30 | 185 |
| 2025 Q1 | 63,688,267 | $1,358,555,234 | +$139,486,819 | $21.34 | 139 |
| 2024 Q4 | 53,348,725 | $1,521,505,868 | -$3,152,045,853 | $28.52 | 159 |
| 2024 Q3 | 141,504,982 | $4,796,662,441 | +$4,781,290,316 | $33.90 | 113 |