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Does Missing the Best Market Days Really Destroy Returns?
Quantitative Research Sofie Coudeville Quantitative Research Sofie Coudeville

Does Missing the Best Market Days Really Destroy Returns?

What really happens if you miss the “10 best market days”?
This popular investment claim is repeated everywhere — but rarely examined with real data. In this quantitative study, we analyse S&P 500 returns from 1980 to 2025, extract the actual best and worst days in the market, and compare three strategies: buy‑and‑hold, missing the best days, and avoiding the worst days. The results reveal a surprising truth: extreme up‑ and down‑moves cluster together, making market timing far harder than it seems. This research cuts through the myth with hard numbers, clear visualizations, and data‑driven insights for long‑term investors.

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Market Breadth
Market Breadth Sofie Coudeville Market Breadth Sofie Coudeville

Market Breadth

A reading of 67% indicates that more than two-thirds of the S&P 500's most influential companies are currently trading above their 50-day moving average. From a quantitative perspective, this is a strong bullish signal. It confirms that the current market trend is not just driven by a handful of tech giants, but is supported by a broad base of institutional "heavyweights."

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Intermarket Correlation Analysis
Intermarket Correlation Sofie Coudeville Intermarket Correlation Sofie Coudeville

Intermarket Correlation Analysis

Market Regime: Macro-Driven Sensitivity

The current correlation matrix reveals a strong positive link (+0.35) between the US Dollar and 10Y Yields, suggesting that capital flows are tightly coupled with interest rate expectations. For the S&P 500, the negative correlation with the US Dollar (-0.12) indicates that a strengthening greenback remains a persistent headwind for equities.

Most notably, the Gold-to-Dollar correlation (-0.34) is the strongest inverse relationship on the board, confirming that Gold is currently trading as a pure currency hedge rather than an independent safe haven. Traders should exercise caution: as long as these macro correlations remain elevated, individual stock selection will likely be overshadowed by broad index moves driven by Treasury volatility.

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ES vs SPX Basis Analysis
ES, Futures Sofie Coudeville ES, Futures Sofie Coudeville

ES vs SPX Basis Analysis

A positive basis of 20.45 points confirms a healthy "Contango" structure. This means the market is pricing in standard interest and dividend expectations without signs of speculative fever or institutional panic. The trend remains statistically stable.

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ES Futures Breakdown
ES, Futures Sofie Coudeville ES, Futures Sofie Coudeville

ES Futures Breakdown

Professional Quant analysis of the ES Futures: merging institutional VWAP baselines with statistical Expected Move projections. Discover why the S&P 500 is currently trading within its normal range and what the Z-Score reveals about the next move. Pure data, 100% ad-free.

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