The Moody’s downgrade of U.S. sovereign debt to Aa1 from Aaa in May 2025, accompanied by a shift to stable outlook, aligned all three major agencies below top-tier ratings and established the current baseline without prompting immediate follow-on actions. Persistent deficits and federal debt exceeding $39 trillion continue to weigh on long-term fiscal metrics, yet recent debt-ceiling legislation and the absence of new negative watches or governance standoffs have kept agency assessments steady through mid-2026. Trader consensus reflected in the 77% market-implied probability of no further downgrade before 2027 embeds the view that additional rating pressure would require sharper deterioration in debt-to-GDP trajectories or renewed political brinkmanship, neither of which has materialized in the latest data releases or communications. Key near-term catalysts include any surprise widening in fiscal gaps ahead of the next debt-limit deadline.