According to @KobeissiLetter, Nvidia NVDA added and then lost roughly 450 billion dollars in market capitalization between 4:00 AM ET yesterday and 2:00 PM ET today, a 900 billion dollar swing in under 36 hours, highlighting exceptional single-stock volatility risk. Source: @KobeissiLetter on X, Nov 20, 2025. This magnitude of movement implies elevated realized and implied volatility for NVDA, suggesting traders prioritize tighter risk controls, dynamic hedging, and wider stop buffers around key technical levels. Source: @KobeissiLetter on X, Nov 20, 2025. Given NVDA’s heavy index weight, such swings can mechanically influence flows in major benchmarks like the S&P 500 and semiconductor indices, warranting attention to correlated moves and options-driven market structure. Source: @KobeissiLetter on X, Nov 20, 2025. Cross-asset desks should account for potential liquidity and slippage effects during similar mega-cap whipsaws by adjusting position sizing and execution tactics intraday. Source: @KobeissiLetter on X, Nov 20, 2025. Crypto-facing traders tracking AI-risk sentiment may monitor whether this NVDA volatility coincides with shifts in broader risk appetite, noting the post reports the equity move itself as the driver. Source: @KobeissiLetter on X, Nov 20, 2025.