JRVR · James River Group Holdings, Ltd.

James River Group's Q1 2026 investor presentation, furnished as Exhibit 99.1, underscores the company's strategic focus on profitable growth within the U.S. small to medium enterprise E&S market. The E&S segment reported a combined ratio of 96.5% (91.8% excluding $6.7 million of reinsurance reinstatement premiums), demonstrating underwriting discipline and favorable loss experience. Core casualty GWP grew 6.5% year-over-year, with excess casualty up 15.0%, supported by a 17.7% increase in new submissions and a 6.6% rise in new quotes across all E&S lines. The group expense ratio improved to 35.4% (33.7% ex-reinstatement premiums), driven by an 11% year-over-year decline in G&A expenses for specialty admitted and corporate segments. Net investment income rose 7% year-over-year, reflecting higher yields. Tangible common equity per share stood at $8.77 as of March 31, 2026. The presentation highlights the company's deliberate reduction in average account size and a compounded rate change of 98% (6.1% for the quarter), indicating pricing adequacy. Management emphasized the de-risked fronting business and legacy protection for pre-2023 accident years, positioning the company for continued margin improvement.