According to @StockMKTNewz, a new X post compiles the 10 strongest single-day gains for the S&P 500 in 2023, 2024, and year-to-date 2025, highlighting how a small number of sessions can dominate annual performance and realized volatility used by traders for risk management and event positioning. source: X post by @StockMKTNewz on Dec 9, 2025. Historically, missing even a few of the market’s best days has materially reduced long-term returns, underscoring the cost of market timing around macro and earnings catalysts for equity and crypto-linked portfolios. source: JPMorgan Asset Management, Guide to the Markets 2024. Large upside days often cluster during elevated VIX regimes and policy inflection points, reflecting short-covering and gamma dynamics that can spill over into correlated assets. source: Cboe Global Markets, VIX and S&P 500 tail events research 2020; S&P Dow Jones Indices, Market Attributes US Equities 2020-2023. BTC and ETH have shown positive but time-varying correlation to the S&P 500 during high-volatility episodes, so equity upside clusters can coincide with crypto beta and liquidity surges that traders can monitor for cross-asset signals. source: Coin Metrics, State of the Network 2023; Kaiko Research, Q2 2024 correlation and liquidity report.