What Is an Island Reversal?
Price gaps away from prior trend, trades several sessions in isolation— the island—then gaps again in the opposite direction, leaving the island stranded. Island top: gap up into island, then gap down away—bullish exhaustion. Island bottom: gap down into island, gap up away—bearish exhaustion. Gaps need not be huge but should be visible on your timeframe. Islands are relatively rare on dailies, more common around earnings and news on individual stocks.
Exhaustion gaps and breakaway gaps bookend the island—identifying gap type strengthens the narrative.
How Do You Identify Island Reversals?
Clear gap between island and prior trend body of trading. Island consists of one or more bars that do not overlap prior range without gap fill. Second gap leaves island without connection to new trend leg. Volume often spikes on island formation and on exit gap. Prior trend must be extended enough that exhaustion is plausible. Partial gap fill into island weakens purity but clustered trading still can qualify if second gap completes isolation.
Index gaps less frequent than single stocks—focus island scans on event-driven equities.
What Confirmation Should Traders Require?
Trade after second gap confirms isolation—short island top after gap down away, long island bottom after gap up away. Do not trade inside island before exit gap—direction uncertain. Failed island if price gaps back across island filling both gaps—pattern negated. Combine with reversal candle on last island bar—shooting star or hammer. Higher-timeframe resistance or support alignment improves odds.
Overnight gap risk dominates—position size for possible gap through stop on next catalyst.
Where Do Stops and Targets Go?
Island top short: stop above island high or last bar high. Island bottom long: stop below island low. Targets: prior trend origin before first gap, measured move of trend leg, or next major support or resistance beyond island. Islands can produce fast moves—partial on first extension. Wide stops across island range require small size.
Gap fill back into island is invalidation—exit rather than widen stop beyond island.
When Do Island Reversals Fail?
Gaps fill quickly reconnecting island—no isolation. One-day island on noise not trend exhaustion. Strong trend gaps up through island top continuing bull run. Low liquidity gap artifacts. Forcing island label on normal consolidation. Rare pattern—overtrading marginal cases loses. Islands work best as clear visual events with volume—when messy, skip.
Document gap sizes on journaled islands—tiny gaps that fill same week are not reliable islands. Focus scans on earnings-driven names where dual gaps are common. Wait for the exit gap before committing; entry gap alone is incomplete. Size for headline gap risk through stops. Stranded islands often act as future resistance or support on retests.
Tag island trades separately in your journal so win rate is not conflated with simpler two-bar reversal patterns.