On October 13, 2025, Moody's Corporation (MCO) experienced a significant intraday selloff, with its stock price falling by 2.8%. This decline was attributed to two main factors: regulatory penalties and the company's own downgrade of the U.S. credit rating. The U.S. Securities and Exchange Commission (SEC) imposed a $49 million fine on six major credit rating agencies, including Moody's, for failures in maintaining electronic communications. Concurrently, Moody's downgraded the U.S. credit rating to Aa1, a move that contributed to broader market anxiety and negatively impacted investor confidence in the company. The intraday trading volume for MCO surged, indicating heightened volatility surrounding the stock.