Skip to main content
OSG logo

OSG · Octave Specialty Group Inc

Track OSG — free
$4.54 -0.05 (-1.09%)
Market Cap
$207.24M
Shares
45.05M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 147
Total Value: $198,021,462
Total Shares: 31,734,225

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 147 13F filers · Δ vs Mar 31, 2026
Top Holder
14.4%
Sep 2023 → Jun 2026 · range 10.4% – 18.9%
+2.7 pts
Top 5
37.1%
Sep 2023 → Jun 2026 · range 32.5% – 48.6%
+3.7 pts
Top 10
53.2%
Sep 2023 → Jun 2026 · range 52.0% – 63.6%
+1.2 pts
HHI
450
Sep 2023 → Jun 2026 · range 389 – 697
Broadly held+48

Quarterly Activity

vs Mar 31, 2026
New
37
Increased
52
Decreased
38
Sold Out
39
Unchanged
20
Holder count: -2
Institutional value: +27.3%
Shares held: -5.1%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 155
Export CSV
Holder Value (USD) % of 13F Shares Open
Key facts CIK 874501 CUSIP 023139884 13F (30d) 140 filings 139 filers Visit website Investor relations