Exhibit 99.1 SIGNET JEWELERS REPORTS SECOND QUARTER FISCAL 2026 RESULTS Q2 Results Ahead of Guidance Raises FY26 Guidance HAMILTON, Bermuda, September 2, 2025 – Signet Jewelers Limited ("Signet" or the "Company") (NYSE:SIG), the world's largest retailer of diamond jewelry, today announced its results for the 13 weeks ended August 2, 2025 ("second quarter Fiscal 2026"). "Our second quarter results were driven by the expansion of on-trend fashion assortment and effective promotion and pricing strategies. Our ...