Who owns Octave Specialty Group 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.
Vanguard Capital Management: 5.0% · 2,269,979 shares
JANE STREET GROUP, LLC: 1.7% · 771,384 shares — Jane Street Capital, LLC: 0.9% · 420,679 shares — Jane Street Options, LLC: 0.0% · 102 shares
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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 Octave Specialty Group Inc they hold. Together these 213 managers report 78.21% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. | $28.5M | 4,572,516 | 0.00% | 10.15% | June 30, 2026 |
| VANGUARD GROUP INC | $19.5M | 2,508,395 | 0.00% | 5.57% | December 31, 2025 |
211 more institutional holders behind a free account
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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 157 funds hold 21.90% 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 |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND | $8.64M | 0.00% | 3.07% | June 30, 2026 |
| Third Avenue Small-Cap Value Fund | $5.93M | 2.96% | 2.97% | April 30, 2026 |
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