DeployQuantSeasonality
Calendar-linked return patterns: the turn-of-the-month effect, 'sell in May', holiday effects, and the like. Most are small, regime-dependent, and heavily debated. Because they're cheap to state as rules ('buy the first session of the month, sell the last'), they make excellent backtesting exercises — the data either supports them in your window or it doesn't.
See it in action: First-to-Last Day of Month →
Backtested on 59 ETFs over 5.7 years with real engine results and a buy-and-hold comparison on every page.
Related terms
Backtests are hypothetical, computed by DeployQuant's engine on minute-resolution consolidated US market data (2021-01-04 to 2026-10-02, $10,000 starting capital, no margin, no fees or slippage in the headline run; buy-and-hold puts 98% of the account in at the first open, as the templates do) and do not guarantee future results. Nothing on this page is investment advice. Live trading involves risk of loss.