Hamilton Insurance Group, Ltd.

The following significant items impacted the consolidated results of operations for the years ended December 31, 2025, 2024 and 2023:

Gross premiums written Gross premiums written were $2.9 billion, $2.4 billion and $2.0 billion for the years ended December 31, 2025, 2024 and 2023, respectively. The increase in gross premiums written for the year ended December 31, 2025 compared to the year ended December 31, 2024 was primarily driven by our casualty reinsurance classes and casualty, specialty and property insurance classes. The increase was as a result of growth in both new and existing business. The increase in gross premiums written for the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily driven by our casualty reinsurance, property reinsurance, specialty reinsurance and casualty insurance business. The growth was a result of new business, increased participations on existing business and a strong rate environment across multiple classes of business.

Underwriting results The combined ratio was 92.9% and 91.3% for the years ended December 31, 2025 and 2024, respectively. The increase was primarily driven by an increase in the catastrophe loss ratio and the acquisition cost ratio, partially offset by a decrease in the attritional loss ratio and other underwriting expense ratio. The increase in the combined ratio from 90.1% for the year ended December 31, 2023 to 91.3% for the year ended December 31, 2024 was driven by an increase in the catastrophe loss ratio and attritional loss ratio, partially offset by a decrease in the other underwriting expense ratio and acquisition cost ratio.

Attritional loss ratio - current year for the year ended December 31, 2025 was 54.4%, compared to 53.1% for the year ended December 31, 2024, an increase of 1.3 percentage points. The attritional loss ratio - current year for the year ended December 31, 2025 was impacted by a change in business mix, including more casualty reinsurance business, and certain large losses primarily in our Bermuda specialty and property reinsurance classes. The attritional loss ratio - current year for the year ended December 31, 2024 was 53.1% compared to 52.2% for the year ended December 31, 2023. The attritional loss ratio - current year for the year ended December 31, 2024 included a specific large loss of $37.9 million arising from the Francis Scott Key Baltimore Bridge collapse.

Attritional loss ratio - prior year for the year ended December 31, 2025 was a favorable 2.2%, compared to 0.0% for the year ended December 31, 2024, a decrease of 2.2 percentage points. The decrease was primarily driven by favorable development in both our Bermuda and International property and specialty classes, partially offset by unfavorable development in certain Bermuda casualty classes. In addition, casualty business protected by the LPT discussed in Note 7, Reinsurance, benefited from favorable development in the underlying reserves of $2.5 million, which was partially offset by a change in the deferred gain of $0.8 million, for a total net positive earnings impact of $1.7 million. The attritional loss ratio - prior year for the year ended December 31, 2024 was flat at 0.0% compared to a favorable 0.8% for the year ended December 31, 2023, an increase of 0.8 percentage points. The increase was primarily driven by unfavorable development in both International and Bermuda casualty and specialty classes, largely offset by favorable development in both International and Bermuda property classes. In addition, casualty business protected by the LPT benefited from favorable development in the underlying reserves of $15.3 million, which was partially offset by a change in the deferred gain of $9.4 million, for a total net positive earnings impact of $5.9 million.

Catastrophe losses - current and prior year development were $159.0 million, $87.6 million and $36.9 million for the years ended December 31, 2025, 2024 and 2023, respectively. Catastrophe losses for the year ended December 31, 2025 were driven by the California wildfires ($159.7 million), severe convective storms ($10.9 million) and the Queensland hailstorms ($6.9 million), partially offset by favorable prior year development of $18.5 million. Catastrophe losses for the year ended December 31, 2024 were driven by Hurricane Helene ($52.6 million), Hurricane Milton ($37.8 million), the Calgary hailstorms ($12.9 million), and Hurricane Debby ($5.6 million), partially offset by favorable prior year development of $21.3 million. Catastrophe losses for the year ended December 31, 2023 were driven by the Hawaii wildfires ($12.0 million), the wind and thunderstorm events which impacted states in both the Southern and Midwest U.S. during March 2023 ($11.0 million), severe convective storms in June 2023 ($7.6 million), Hurricane Idalia ($6.5 million), and the Vermont floods ($5.0 million), partially offset by favorable prior year development of $5.2 million.

(1) Prior to non-controlling interest performance incentive allocation

Total net realized and unrealized gains (losses) on investments and net investment income (loss) -TSHF, prior to non-controlling interest, returned income of $564.3 million, $487.2 million and $143.7 million for the years ended December 31, 2025, 2024 and 2023, respectively. This includes the fund's returns, net of investment management fees.

Net investment income, net of non-controlling interest - TSHF, returned income of $300.9 million, $274.5 million and $122.1 million for the years ended December 31, 2025, 2024 and 2023, respectively. This includes the fund's returns, net of investment management fees and performance incentive allocations. The aggregate incentive allocation to which the investment manager is entitled is included in "Net income (loss) attributable to non-controlling interest" in our GAAP financial statements.

TS Hamilton Fund produced returns, net of investment management fees and performance incentive allocations, of 16.0%, 16.3% and 7.6% for the years ended December 31, 2025, 2024 and 2023, respectively.

For the year ended December 31, 2025, TS Hamilton Fund experienced gains from single name equities trading within the equity market neutral vehicles STV, ESTV, and ATV. Gains from single name equities trading were led by the U.S., followed by East Asia. TS Hamilton Fund also experienced gains from macro trading within the scientific discretionary macro vehicle, NTV, the systematic macro vehicle, FTV, the relative value rates vehicle, KTV, and the relative value macro vehicle, HTV.

For the year ended December 31, 2024, gains in TS Hamilton Fund were led by single name U.S. equities trading in STV. The TS Hamilton Fund also saw positive contributions to gains from non-U.S. equities trading in ESTV. In ESTV, gains were experienced in all underlying regions. The TS Hamilton Fund also experienced gains from macroeconomic trading in FTV. In FTV, gains were led by equities, credit, and fixed income.

For the year ended December 31, 2023, TS Hamilton Fund generated positive returns in single name equities trading in STV and ESTV, partially offset by losses in macroeconomic trading in FTV. In single name equities trading, STV and ESTV both made positive contributions. Within ESTV, trading was most profitable in Europe, followed by East Asia and Pan-America, while China experienced losses. Within FTV, losses were driven by commodities, fixed income, and equities, partially offset by gains in currencies and credit.

Total net realized and unrealized gains (losses) on investments and net investment income (loss) - other returned income of $210.9 million, $87.5 million and $96.4 million for the years ended December 31, 2025, 2024 and 2023, respectively. Income for the year ended December 31, 2025 was primarily driven by investment income on a larger portfolio of higher yielding assets and positive mark-to-market returns. During the year ended December 31, 2024, the fixed maturity securities trading portfolio produced positive returns as the result of investment yield, partially offset by unrealized losses, primarily arising from U.S. Treasury interest rate increases. During the year ended December 31, 2023, the fixed maturity securities trading portfolio produced positive returns as the rate of rising interest rates slowed and reinvested funds generated higher yields.