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Tuesday is not Friday

Volatility changes by weekday. Mondays often start slow, with ranges building as the week gets going. Tuesday through Thursday tend to carry the heaviest flow. Fridays start active and fade, especially after the London close.

Specific events add structure: central bank meetings, the NFP on the first Friday of the month, mid-week inflation prints.

A strategy performing well in the first half of the week may struggle on Fridays. Mixed together in one sample, the differences hide.

Splitting trade results by weekday is a fast check. A table with average profit, win rate, and costs per day of the week often shows one or two days dragging the total down.

Some scalpers drop one weekday altogether. Others scale position size by day.

Month position matters as well. The first Friday brings the US employment report, and the last Friday often carries month-end flows. Those two Fridays behave nothing like the other ones, so lumping all Fridays together blurs the picture. Splitting by both weekday and week of the month sharpens it considerably.

Which weekday produces the weakest results on the account, and is the pattern stable over several months?

By Friday afternoon in New York, the week is winding down. Volume thins, many participants are flattening positions, and price movement narrows. It looks like an easy environment for a scalper.

Underneath, liquidity providers are widening quotes a little and holding less inventory, since nobody wants to carry risk into the weekend. A modest order can move price further than it would on Tuesday, and the moves can be sharp but short.

Position squaring creates its own flows. Traders closing profitable trades or cutting losers add directional pressure that has nothing to do with the week's themes. Prices can drift in ways that look like a new trend and then evaporate Monday morning.

A further risk lurks in the final hour: weekend headline risk. A news item hitting at 4:30pm Friday finds a market with very little depth to absorb it.

Many scalpers treat Friday after 3pm New York as a no-trade zone, not because of any rule, but because the data from past weeks shows poorer fills and worse results.

Friday afternoons also hold a special risk for pending orders and positions with wide stops. Stops that were placed days ago and forgotten can trigger in a thin market, and the fills are poorer than on a normal day. A quick audit before the weekend, cancelling stale orders and checking every open position, takes two minutes and prevents most unpleasant Monday surprises.

Is Friday afternoon a profitable window in anyone's logs, or a drain?