Brown & Brown is trading 16.33% higher at $71.79 after hours; the catalyst remains unconfirmed. - It closed at $61.71 on September 23, 2026. - No company-specific announcement, earnings release, acquisition, or filing was identified for September 23; the latest listed company news was an executive appointment on September 21. - Broader markets declined, so macro weakness does not clearly explain the sharp after-hours gain.