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Weekend Gap Reversionthe overreaction with its own paper

Evidence: StrongIntermediateMean reversion · Calendar

Two days of news arrive into a market that cannot trade, and on Monday it all prints at once. The opening gap is a single, forced repricing with no liquidity behind it — which is the textbook condition for an overreaction.

This is the only page in this book with FX-specific research on the exact effect, rather than on reversion in general: a documented reversal after significant weekend price differences in spot foreign exchange.

The trade is to fade the gap toward Friday's close, sized small, with the whole thing over by Monday's European close.

Category
Mean reversion · Calendar
Timeframe
M15 execution · the gap measured on D1
Suitable pairs
EURUSD · GBPUSD · USDJPY · AUDUSD — majors only, where the gap is liquidity and not a repricing
Session
Monday open through the European close
Indicators / tools
Friday close · Monday open · ATR(14) on D1 · an economic calendar for the weekend

Valid setup

MR-06 · WEEKEND GAP REVERSION — VALID SETUP EURUSD · M15 · Monday opens 0.6 × ATR below Friday's close, with no weekend news LONG 1.08533 1.08576 1.08618 1.08660 1.08703 1.08745 1.08787 FRIDAY MONDAY — the gap is negotiated, not concluded AFTER THE EUROPEAN CLOSE the gap 1R TARGET = Friday's close MONDAY OPEN ENTRY = first M15 close back toward Friday STOP = beyond the Monday extreme 1 2 3 4 5 Monday open European close 1.08748 1.08612 1.08596 1.08558 ① Friday closes at 1.08748 ② Monday opens 0.6 × ATR below it ③ No weekend event — this is liquidity, not news ④ First M15 close back toward Friday — enter ⑤ Target Friday's close, and nothing past it ⑥ Flat by the European close either way

Exact rules

Entry

  • Measure the gap: Monday's open against Friday's close, in units of daily ATR.
  • Size gate: trade only gaps between 0.3 and 1.2 × ATR(14). Smaller is noise; larger is usually genuine news and is not this trade.
  • News gate: skip entirely if the gap follows a weekend event — an election, a central bank statement, a geopolitical shock. Those gaps are repricings and they do not close.
  • Trigger: wait for the first M15 candle that closes back in the direction of Friday's close. Enter at that close.
  • One trade per pair per week. No adding.

Stop loss

  • Beyond the Monday extreme, plus 0.3 × ATR(14) on D1.
  • If price extends past that extreme, the gap was information rather than overreaction.
  • Risk 0.25%–0.5% — below normal, because Monday liquidity is thin and slippage is worse than the chart suggests.

Take profit / exit

  • Friday's close. That is the level the gap opened away from, and it is the whole thesis.
  • Flat by the European close on Monday whether or not the gap has filled. After that you are holding a directional position for no reason.
  • A partial at half the gap is a reasonable variant, tested separately.

Build Weekend Gap Reversion

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More from Mean reversion

RSI(2) Extremesthe short-period oscillatorBollinger Band Fadetwo standard deviationsZ-Score Reversionthe distance, stated plainly

Trading carries risk and most retail accounts lose money. Nothing on this page is financial advice or a recommendation to trade. The chart is an illustration of the rules on constructed candles — it is not a record of a trade and not a backtest.