AMBC · Insider trading · 13F holders · Congress trades
Octave Specialty Group Inc (AMBC)
Who is buying and selling AMBC: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 9
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
AMBC at a glance
- No open-market insider purchases or sales of AMBC were filed in the last 90 days.
- 9 13F filers hold AMBC among their 50 largest positions, worth $52.1M combined, including Third Avenue Management. The biggest bets by portfolio weight are Western Standard LLC (4.8%), RIHO Partners, LLC (1.9%) and Third Avenue Management (1.3%). In their latest 13Fs, 2 managers opened a new position and 0 added to one.
- No member of Congress has disclosed a trade in AMBC.
AMBC insider trading
No open-market insider purchases or sales of AMBC were filed in the last 90 days.
Who owns AMBC? Hedge funds and superinvestors
9 13F filers hold AMBC among their 50 largest positions, worth $52.1M combined, including Third Avenue Management. The biggest bets by portfolio weight are Western Standard LLC (4.8%), RIHO Partners, LLC (1.9%) and Third Avenue Management (1.3%). In their latest 13Fs, 2 managers opened a new position and 0 added to one.
Superinvestors holding AMBC: Third Avenue Management 1.3%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Western Standard LLCHedge fund | 4.8% | $14.0M | 2,247,591 | +0.0% shares | Q2 2026 |
| Prescott Group Capital Management, L.L.C.Hedge fund | 0.9% | $10.3M | 1,647,793 | +3.5% shares | Q2 2026 |
| Third Avenue ManagementSuperinvestor · Mutual fund manager | 1.3% | $8.4M | 1,341,879 | +0.0% shares | Q2 2026 |
| Bain Capital Credit, LPHedge fund | 1.9% | $6.9M | 1,108,012 | +0.0% shares | Q2 2026 |
| Bracebridge Capital, LLCHedge fund | 0.8% | $3.6M | 579,234 | +0.0% shares | Q2 2026 |
| RIHO Partners, LLCInstitutional asset manager | 1.9% | $3.5M | 554,818 | +1.5% shares | Q2 2026 |
| Wolf Hill Capital Management, LPHedge fund | 0.3% | $3.0M | 480,187 | -67.3% shares | Q2 2026 |
| AYAL Capital Advisors LtdHedge fund | 0.9% | $1.7M | 280,000 | New | Q2 2026 |
| Lone Peak Global Investors LLCInstitutional asset manager | 0.1% | $672K | 107,676 | New | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 9). Screen AMBC in the grand portfolio →
AMBC stock trades by members of Congress
No member of Congress has disclosed a trade in AMBC.
AMBC questions and answers
Are insiders buying AMBC stock?
No open-market insider purchases or sales of AMBC were filed in the last 90 days.
Which hedge funds own AMBC?
9 13F filers hold AMBC among their 50 largest positions, worth $52.1M combined, including Third Avenue Management. The biggest bets by portfolio weight are Western Standard LLC (4.8%), RIHO Partners, LLC (1.9%) and Third Avenue Management (1.3%). In their latest 13Fs, 2 managers opened a new position and 0 added to one.
Has Congress traded AMBC?
No member of Congress has disclosed a trade in AMBC.
Who is the largest holder of AMBC?
Among 13F filers, Western Standard LLC reports the largest AMBC position, $14.0M (2,247,591 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Western Standard LLC's: 4.8% of its portfolio.
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