Who owns OneStream, Inc., from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
T. Rowe Price Investment Management, Inc.: 0.0% · 111 shares
Darlington Partners Capital Management, LP: 0.0% · 0 shares — Darlington Partner GP, LLC: 0.0% · 0 shares — Darlington Partners, L.P.: 0.0% · 0 shares
11 more 5% stakes behind a free account
See every investor who has disclosed crossing 5% of OneStream, Inc..
Sign up freeEvery institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of OneStream, Inc. they hold. Together these 300 managers report 94.25% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | $214M | 11,618,772 | 0.08% | 7.25% | December 31, 2025 |
| GLAZER CAPITAL, LLC | $181M | 7,537,536 | 3.84% | 4.70% | March 31, 2026 |
298 more institutional holders behind a free account
See every manager reporting OneStream, Inc., how much of the company they hold, and how big the position is inside their own portfolio.
Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 143 funds hold 24.99% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| Nexpoint Merger Arbitrage Fund | $80.1M | 5.76% | 2.08% | March 31, 2026 |
| VANGUARD TOTAL STOCK MARKET INDEX FUND | $68.6M | 0.00% | 1.78% | March 31, 2026 |
141 more funds behind a free account
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