B
Stonington Ins Co
Madison,  WI
Rating Date
June 2026
NAIC
Classification
Risk Adjusted
Capital Ratio #1
Risk Adjusted
Capital Ratio #2
Loss
Ratio
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Total
Assets
Capital
Net
Premiums
Net
Income
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Major Rating Factors: Fair reserve development (3.6 on a scale of 0 to 10) as reserves have generally been sufficient to cover claims. Good profitability index (4.9). Excellent expense controls. Good overall results on stability tests (5.4) despite excessive premium growth. Stability strengths include good operational trends and excellent risk diversification.
Other Rating Factors: Strong long-term capitalization index (10.0) based on excellent current risk adjusted capital (severe and moderate loss scenarios). Moreover, capital levels have been consistent in recent years. Good liquidity (7.0) with sufficient resources (cash flows and marketable investments) to handle a spike in claims.
Stability Factors: D - Limited diversification of general business, policy, and/or investment risk.
Principal Lines of Business: Work comp (43.6%), personal/comm auto (15.0%), product liab. (12.9%), other (28.5%)
Licensed in: All states
Principal Investments: Investment grade bonds (85.0%), cash (12.4%), other (2.7%)
Ratios
Premium to Surplus
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Reserve to Surplus
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1-Year Reserve Development
2-Year Reserve Development
Expense Ratio
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Combined Ratio
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Cash From Underwriting
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Net Premium Growth
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Investments in Affiliates
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Corporate Info
Group Affiliation
QBE Ins Group Limited
Investment Rating
--
Company Address
10 Terrace Ct
Madison, WI 53718
Phone Number
(800) 362-5448
NAIC Number
10340
Largest Affiliates
B
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B
Sun Prairie, WI - P&C