EXHIBIT 99.1 RLI REPORTS THIRD QUARTER 2025 RESULTS PEORIA, ILLINOIS, October 20, 2025 – RLI Corp. (NYSE: RLI) – RLI Corp. reported third quarter 2025 net earnings of $124.6 million ($1.35 per share), compared to $95.0 million ($1.03 per share) for the third quarter of 2024. Operating earnings(1) for the third quarter of 2025 were $77.0 million ($0.83 per share), compared to $60.4 million ($0.65 per share) for the same period in 2024. All share and per share data in this release reflect the two-for-one stoc ...