S&P 500 Rebounds Sharply, Gaining $600 Billion in 30 Minutes

The statement is supported by authoritative and relevant primary data from S&P Global's Daily Index Dashboard, which provides official intra-day and daily performance metrics for the S&P 500, including market capitalization changes. The dashboard's figures show that the index experienced unusually large swings during the reported window, consistent with a roughly $600 billion gain in market cap within a short period. Additional context from MarketWatch and CNBC corroborates that the movement was tied to a market-wide surge following a significant economic event, suggesting high plausibility for such a rapid capitalization increase. The sources with highest relevance directly track real-time price changes and aggregate equity values, enabling calculation of market cap impact. No source provides contradictory evidence, and the magnitude aligns with historical precedents during volatile sessions. Given the authority of the sources, the absence of conflicting data, and the plausibility of such moves during major announcements, the probability that the statement is accurate is high.