AMBC Ambac Financial Group, Inc.
AMBC was the NYSE ticker symbol of Ambac Financial Group, Inc. It no longer appears in current US listing files, which usually means the security was delisted, acquired, merged, or moved to a new symbol. SEC records list “Ambac Financial Group Inc” as a former name of Octave Specialty Group Inc, which trades today as OSG.
AMBC at a glance
- Symbol
- AMBC
- Company / issuer
- Ambac Financial Group, Inc.
- Security type
- Common stock
- Last exchange
- NYSE
- Status
- No longer listed
- Seen in listing files
- Jan 2015 – Oct 2025
- Sector
- Finance
- Industry
- Property-Casualty Insurers
- Country
- United States
- Last reported market cap
- $397.7 million (Oct 2025)
AMBC ticker history
All listing names we have recorded under the symbol AMBC, from periodic snapshots of US exchange listing files.
| Name | Security | First seen | Last seen |
|---|---|---|---|
| Ambac Financial Group, Inc. | Common Stock | Jan 2015 | Oct 2025 |
Snapshots have gaps (notably 2018–2021, and 2015–2021 for NYSE listings), so the actual delisting date may be later than the last-seen date.
Other symbols for Ambac Financial Group, Inc.
Frequently asked questions
What company has the ticker symbol AMBC?
AMBC was the ticker symbol of Ambac Financial Group, Inc on NYSE.
Is AMBC still trading?
No. AMBC does not appear in current US exchange listings as of Sep 2026; it was last seen in our listing snapshots in Oct 2025. The company now appears to trade as OSG (Octave Specialty Group Inc).
Which exchange was AMBC listed on?
AMBC was listed on NYSE.