NRUC – 424B3 April 7, 2026 In SEC https://www.sec.gov/Archives/edgar/data/70502/000007050226000264/0000070502-26-000264-index.htm #NRUC AT&T Receives Frost & Sullivan’s 2026 US Public Safety Solutions Company of the Year Recognition for Excellence in Mission-Critical Connectivity IIT2026 CONFERENCE BRINGS GLOBAL THOUGHT LEADERS TO LONG BEACH