SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These unaudited condensed consolidated financial statements (the “financial statements”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information, and with the U.S. Securities and Exchange Commission’s (“SEC”) instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by U.S. GAAP for complete financial statements. The financial statements should be read in conjunction with the Company’s audited consolidated financial statements included in the Company’s 2024 Form 10-K.
Consolidation	The financial statements include the accounts of GLRE and the consolidated financial statements of its wholly-owned subsidiaries and all significant intercompany transactions and balances have been eliminated on consolidation.
Reclassifications	Reclassifications The following amounts in the prior period condensed consolidated financial statements have been reclassified to conform to the presentation of the current condensed consolidated financial statements: •The Company has reported separately “Underwriting expenses” from “Corporate and other expenses” in the condensed consolidated statements of operations, which were previously combined and reported as “General and administrative expenses”. This resulted in no change to the previously reported total expenses or net income. •The Company has reclassified investment-related income from Lloyd’s syndicates, which was previously presented in the condensed consolidated statements of operations under the caption “Other income, net”, to “Net investment income”. This resulted in no change to the previously reported total revenues or net income. •During 2025, the Company updated its definition of CAT event loss to be any individual CAT loss in excess of $5 million, net of reinsurance recoveries. For the various U.S. tornadoes (including severe convective storms), the Company has aggregated these and reported the total as CAT loss in Note 7 and under the “Corporate” column in the segment reporting tables in Note 16. Accordingly, the comparative prior year CAT loss disclosures have been recast to conform with this change.
Recently Issued Accounting Standards Not Yet Adopted	Recently Issued Accounting Standards Not Yet Adopted In December 2023, FASB issued ASU 2023-09, Income Taxes Topic (740) - Improvements to Income Tax Disclosures, which provides more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. While early adoption is permitted, a public company should apply the amendments prospectively. This ASU is effective for the Company’s 2025 year-end financial statements. In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses (“ASU 2024-03”). This ASU 2024-03 requires more detailed disclosures about the type of expenses (including purchases of inventory, employee compensation, and depreciation / amortization) in commonly presented expense captions in the consolidated income statements (e.g. cost of sales, general and administrative expenses, and research and development). ASU 2024-03 is effective for public business entities for fiscal years beginning after December 15, 2026, and interim periods within fiscal years after December 15, 2027. Early adoption is permitted. The Company is currently evaluating the disclosure impact of the above new ASUs.

SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2025

These unaudited condensed consolidated financial statements (the “financial statements”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information, and with the U.S. Securities and Exchange Commission’s (“SEC”) instructions to Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by U.S. GAAP for complete financial statements. The financial statements should be read in conjunction with the Company’s audited consolidated financial statements included in the Company’s 2024 Form 10-K.

Consolidation

The financial statements include the accounts of GLRE and the consolidated financial statements of its wholly-owned subsidiaries and all significant intercompany transactions and balances have been eliminated on consolidation.

Reclassifications

The following amounts in the prior period condensed consolidated financial statements have been reclassified to conform to the presentation of the current condensed consolidated financial statements:

•The Company has reported separately “Underwriting expenses” from “Corporate and other expenses” in the condensed consolidated statements of operations, which were previously combined and reported as “General and administrative expenses”. This resulted in no change to the previously reported total expenses or net income.

•The Company has reclassified investment-related income from Lloyd’s syndicates, which was previously presented in the condensed consolidated statements of operations under the caption “Other income, net”, to “Net investment income”. This resulted in no change to the previously reported total revenues or net income.

•During 2025, the Company updated its definition of CAT event loss to be any individual CAT loss in excess of $5 million, net of reinsurance recoveries. For the various U.S. tornadoes (including severe convective storms), the Company has aggregated these and reported the total as CAT loss in Note 7 and under the “Corporate” column in the segment reporting tables in Note 16. Accordingly, the comparative prior year CAT loss disclosures have been recast to conform with this change.

Recently Issued Accounting Standards Not Yet Adopted

In December 2023, FASB issued ASU 2023-09, Income Taxes Topic (740) - Improvements to Income Tax Disclosures, which provides more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. While early adoption is permitted, a public company should apply the amendments prospectively. This ASU is effective for the Company’s 2025 year-end financial statements.

In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses (“ASU 2024-03”). This ASU 2024-03 requires more detailed disclosures about the type of expenses (including purchases of inventory, employee compensation, and depreciation / amortization) in commonly presented expense captions in the consolidated income statements (e.g. cost of sales, general and administrative expenses, and research and development). ASU 2024-03 is effective for public business entities for fiscal years beginning after December 15, 2026, and interim periods within fiscal years after December 15, 2027. Early adoption is permitted.

The Company is currently evaluating the disclosure impact of the above new ASUs.