Nature of business and basis of presentation	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of business and basis of presentation	1. Nature of business and basis of presentation Accelerant Holdings, together with its subsidiary companies ("Accelerant", "we", "us", "our" or the "Company"), connects selected specialty insurance underwriters ("Members") with Risk Capital Partners through its data-driven risk exchange (the “Accelerant Risk Exchange”). We, together with our Risk Capital Partners, provide property and casualty insurance to policyholders via our network of Members, which are typically MGAs. We focus on small-to-medium sized commercial clients primarily in the United States ("US"), Europe ("EU"), Canada and the United Kingdom ("UK"). These unaudited condensed consolidated interim financial statements and related notes have been prepared in accordance with US GAAP for interim financial information. Accordingly, they do not include all of the financial information and note disclosures required by US GAAP for complete consolidated financial statements. The condensed consolidated interim financial statements are presented in US Dollars and all amounts are in millions, except for the number of shares, per share amounts and the number of securities. Certain prior year comparative information has been reclassified to conform to the current presentation. In our opinion, these unaudited condensed consolidated financial statements reflect all adjustments that are normal and recurring in nature necessary to fairly state our financial position as of June 30, 2026, as well as our results of operations and cash flows for the six months ended June 30, 2026 and 2025. The results of operations for any interim period are not necessarily indicative of results for the full year. These unaudited condensed consolidated financial statements and related notes should be read in conjunction with our audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2025 (the "2025 Annual Report"). The condensed consolidated financial information as of December 31, 2025 was derived from the audited consolidated financial statements in our 2025 Annual Report, but does not include all disclosures required by US GAAP. Partnership with WoodStar Reciprocal Exchange During the second quarter of 2026, we entered a partnership with the newly formed WoodStar Reciprocal Exchange (“WoodStar”). WoodStar was funded with a total of $220 million of surplus notes, composed of $160 million investment in surplus notes by unrelated third parties and a $60 million investment in surplus notes by WoodStar Risk Management Inc. ("WRMI"), WoodStar's attorney-in-fact, also funded by unrelated third parties. WRMI's investment in the surplus notes was partly funded by $40 million paid in kind interest debt instrument issued by an unrelated third party. WoodStar will provide underwriting capacity for the Accelerant Risk Exchange. Accelerant will provide underwriting and other services to WoodStar pursuant to contractual service arrangements. WoodStar is managed by WRMI. We hold a majority ownership interest in WRMI, a variable interest entity, however a third-party investor in the WoodStar structure maintains certain rights that provide contractual authority over the most substantial activities of WRMI, and therefore we do not consolidate WoodStar's financial results. Our ownership interest in WRMI will be treated as an equity method investment within our consolidated financial statements. Our maximum exposure to loss consists of our basis in our investment in WRMI (which was immaterial as of June 30, 2026), the obligation to perform under our service contracts with WoodStar and our share of the operating results from WRMI.

Accelerant Holdings, together with its subsidiary companies ("Accelerant", "we", "us", "our" or the "Company"), connects selected specialty insurance underwriters ("Members") with Risk Capital Partners through its data-driven risk exchange (the “Accelerant Risk Exchange”). We, together with our Risk Capital Partners, provide property and casualty insurance to policyholders via our network of Members, which are typically MGAs. We focus on small-to-medium sized commercial clients primarily in the United States ("US"), Europe ("EU"), Canada and the United Kingdom ("UK").

These unaudited condensed consolidated interim financial statements and related notes have been prepared in accordance with US GAAP for interim financial information. Accordingly, they do not include all of the financial information and note disclosures required by US GAAP for complete consolidated financial statements. The condensed consolidated interim financial statements are presented in US Dollars and all amounts are in millions, except for the number of shares, per share amounts and the number of securities. Certain prior year comparative information has been reclassified to conform to the current presentation.

In our opinion, these unaudited condensed consolidated financial statements reflect all adjustments that are normal and recurring in nature necessary to fairly state our financial position as of June 30, 2026, as well as our results of operations and cash flows for the six months ended June 30, 2026 and 2025. The results of operations for any interim period are not necessarily indicative of results for the full year.

These unaudited condensed consolidated financial statements and related notes should be read in conjunction with our audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2025 (the "2025 Annual Report"). The condensed consolidated financial information as of December 31, 2025 was derived from the audited consolidated financial statements in our 2025 Annual Report, but does not include all disclosures required by US GAAP.

During the second quarter of 2026, we entered a partnership with the newly formed WoodStar Reciprocal Exchange (“WoodStar”). WoodStar was funded with a total of $220 million of surplus notes, composed of $160 million investment in surplus notes by unrelated third parties and a $60 million investment in surplus notes by WoodStar Risk Management Inc. ("WRMI"), WoodStar's attorney-in-fact, also funded by unrelated third parties. WRMI's investment in the surplus notes was partly funded by $40 million paid in kind interest debt instrument issued by an unrelated third party. WoodStar will provide underwriting capacity for the Accelerant Risk Exchange. Accelerant will provide underwriting and other services to WoodStar pursuant to contractual service arrangements. WoodStar is managed by WRMI. We hold a majority ownership interest in WRMI, a variable interest entity, however a third-party investor in the WoodStar structure maintains certain rights that provide contractual authority over the most substantial activities of WRMI, and therefore we do not consolidate WoodStar's financial results. Our ownership interest in WRMI will be treated as an equity method investment within our consolidated financial statements. Our maximum exposure to loss consists of our basis in our investment in WRMI (which was immaterial as of June 30, 2026), the obligation to perform under our service contracts with WoodStar and our share of the operating results from WRMI.