Using Sentiment Filters for an Overnight S&P 500 Strategy

Summary

The document describes an overnight SPY approach conditioned on three sentiment and trend signals: SPY above its 20-day moving average, VIX below its moving average, and the Brain Market Sentiment indicator above its 20-day average. When all conditions hold, the investor holds SPY overnight. The proposed role is an overlay to inform other trades, rather than a standalone system.

The discussion places this rule in the context of research finding that much of the US equity premium has accrued overnight. It suggests that opening order imbalances and illiquidity may help explain the night-versus-day return pattern, while noting that liquidity accounts for only a small portion. The cited paper presents market-behavior analysis, not a trading system, and warns that transaction costs could be high. No performance figures for this specific rule are supplied, so its profitability and practical tradability remain uncertain.

Key ideas

• The rule holds SPY overnight only when three sentiment and trend filters are positive.
• The filters compare SPY, VIX, and the Brain Market Sentiment indicator with moving averages.
• The source frames the approach as a trade overlay rather than a standalone strategy.
• The document links the overnight return pattern partly to opening order flow and illiquidity.
• High transaction costs and absent performance evidence limit conclusions about tradability.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.