Is Early Monday Morning Too Thin to Trade?

True — on movement.

The claim as it is usually statedEarly Monday specifically is thin and choppy before London opens.

Genuinely quieter in 15 of 19 markets. This is one of the few pieces of folklore that survives intact, though "quieter" is a statement about your position size, not about your odds.

What the data shows

Across 19 markets: direction: 5 of 19 markets differ beyond chance · movement: genuinely quieter in 16 of 19. Median movement in the window, 75% of a normal hour.

Market	In the window	Rest	z	Movement	Samples
SPX500	52.7%	52.3%	0.4	51% of normal	2,420
USD/CHF	50.1%	49.4%	0.9	53% of normal	4,572
NAS100	52.1%	52.4%	-0.3	54% of normal	2,422
US30 (Dow)	50.3%	51.4%	-1.2	58% of normal	3,195
USD/CAD	48.6%	49.8%	-2.2	62% of normal	8,351
EUR/GBP	49.5%	48.8%	0.8	62% of normal	3,472

This claim is about how much the market moves, so the six shown are those whose movement changed most — not those whose direction did. The direction column is kept beside it because a claim about activity is often repeated as if it were about direction.

Who says it

BrokerXplorer

How this was measured

Every claim here reduces to a window on the clock or the calendar, so it can simply be checked. We compare the claimed window against the rest of the week on 23 years of hourly data across 19 markets, measuring two separate things the folklore tends to conflate: direction (does the window close higher more often?) via a two-proportion z-test, and movement (is the average move bigger or smaller?). A window can be perfectly ordinary in direction and genuinely quieter in movement — saying which is the entire point.

The bar here is |z| ≥ 2, deliberately more lenient than the |z| ≥ 3 this site applies to its own numbers: when testing someone else's claim, failing to reject it even at a lenient bar is the stronger statement.

Check any hour yourself →

Free on the four major pairs, with the full 23 years and the sample size on every number.