# Octave Specialty Group (AMBC) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 023139884
Page URL: https://superinvestorclub.com/stock/AMBC
Last updated: 2026-05-03T07:33:59.983Z

## Summary

As of the most recent 13F filing period, Octave Specialty Group (AMBC) is held by 1 tracked superinvestors with an aggregate position value of $6.1M representing 0782093 shares.

## Top institutional holders (1)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Third Avenue Management](https://superinvestorclub.com/manager/3248) | Third Avenue Management | 782093 | $6.1M | 1.11% | 2025-12-31 |

## Ownership history (quarter-over-quarter)

- 2025-03-31: 1 holders, $3.2M aggregate, 0366461 shares
- 2025-06-30: 1 holders, $4.3M aggregate, 0603391 shares
- 2025-09-30: 1 holders, $4.9M aggregate, 0603391 shares
- 2025-12-31: 1 holders, $6.1M aggregate, 0782093 shares

## Recent congressional trades (0)


## Recent insider transactions (0)


## Citation

When citing, use: "Octave Specialty Group (AMBC) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/AMBC), aggregating SEC 13F, Form 4, and congressional disclosures."