Who writes financial guaranty in California
Ranked by direct premium written in 2025 from the California Department of Insurance market share report (every company, not a top-N list).
5 companies wrote financial guaranty in California in 2025, $24.2M in direct premium. Assured Guaranty Inc. led with 60.6%; the top five hold 100%.
By Sam Alishahi, independent insurance broker · All lines in California
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | Assured Guaranty Inc. | 30180 | MD | Admitted (licensed) | $14.7M | 60.56% |
| 2 | Build America Mutual Assurance Company | 14380 | NY | Admitted (licensed) | $5.5M | 22.72% |
| 3 | Ambac Assurance Corporation | 18708 | WI | Admitted (licensed) | $2.1M | 8.77% |
| 4 | MBIA Insurance Corporation | 12041 | NY | Admitted (licensed) | $1.3M | 5.47% |
| 5 | Syncora Guarantee, Inc. | 20311 | NY | Admitted (licensed) | $601,638 | 2.48% |
Method and source
Source: the California Department of Insurance company list, read 2026-10-17 and the surplus lines list. California's company search lists every company on file (all lines, including some no longer active); P&C status comes from the merge. "Premium" is direct premium written in the state for the year shown; "share" is that company's part of the state total for the line. A company can be licensed for a line and write none of it, and a surplus lines insurer can write a line without a state license for it.
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