OSG OCTAVE SPECIALTY GROUP INC: institutional ownership and insider trading
155 funds reported holding $276M of OCTAVE SPECIALTY GROUP INC in their latest 13F filings; in Q2 2026 funds net sold $8.74M, with 35 new positions and 35 funds selling out; over the last 12 months insiders bought $91.3K and sold $0 on the open market.
Famous investors holding OSG
- Ken Griffin (Citadel Advisors): $3.31M, 0.0% of the portfolio
- Renaissance Technologies (Renaissance Technologies): $731K, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $122K, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $76.2K, 0.0% of the portfolio
Largest institutional holders of OSG
- Repertoire Partners LP — $47.8M
- BlackRock, Inc. (BLK) — $28.5M
- VANGUARD GROUP INC — $19.5M
- Western Standard LLC — $14.0M
- VANGUARD CAPITAL MANAGEMENT LLC — $12.3M
- Nuveen Asset Management, LLC — $10.4M
- PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. — $10.3M
- THIRD AVENUE MANAGEMENT LLC — $8.37M
- Bain Capital Credit, LP — $6.91M
- GEODE CAPITAL MANAGEMENT, LLC — $6.91M
Recent OSG insider trades
- Jan 2, 2026: LeBlanc Claude bought 12,000 shares ($91.1K)
- Nov 12, 2025: Smith R Sharon bought 20 shares ($205)
- Oct 1, 2025: LeBlanc Claude bought 25,000 shares ($214K)
- Aug 11, 2025: LeBlanc Claude bought 25,000 shares ($176K)
5%+ owners
- Vanguard Capital Management: 5.0% (Schedule 13G, filed Jul 31, 2026)