Who writes financial guaranty in Illinois
Ranked by direct premium written in 2025 from the Illinois market share report (every company, not a top-N list).
3 companies wrote financial guaranty in Illinois in 2025, $8.3M in direct premium. Assured Guaranty Inc. led with 55.5%; the top five hold 100%. 4 companies are licensed for the line.
By Sam Alishahi, independent insurance broker · All lines in Illinois
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | Assured Guaranty Inc. | 30180 | MD | Admitted (licensed) | $4.6M | 55.48% |
| 2 | Build America Mutual Assurance Company | 14380 | NY | Admitted (licensed) | $3.3M | 39.75% |
| 3 | Ambac Assurance Corporation | 18708 | WI | Admitted (licensed) | $397,429 | 4.76% |
Method and source
Source: the Illinois insurance regulator company list, read 2026-10-18. IDOI 2025 Market Share Report: Property and Casualty (published March 2026, 2025 annual-statement data). Lists every company with Illinois business written on the P&C statement: licensed companies, surplus lines insurers and risk retention groups together, with no status/type flag, so type is '' for all rows and the list is NOT a certificate-of-authority roster (a licensed company with zero IL premium and zero losses is omitted; non-admitted writers are included). 'lines' = P&C statement lines of business the company reported IL premium or losses under (48 of 54 lines have entries), a proxy for lines of authority. No 'since' date in the source. No Illinois surplus lines eligibility list exists (IL has no white list). 26 companies had a name or domicile cell missing in at least one PDF row; filled from the same NAIC code's other rows. "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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