TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

Williams' Form 10-K Item 1C cybersecurity disclosure describes the company's NIST CSF-aligned cybersecurity risk management program, third-party assessor engagement, third-party service provider oversight, and governance roles (CISO, CIO, Cybersecurity Executive Advisory Board, Audit Committee, Board of Directors). The filing describes program structure only; no specific cybersecurity incident, breach, or material event is disclosed.