Island Reversal
An Island Reversal is a chart pattern in which a cluster of price action becomes isolated from surrounding price bars by two gaps — one gap separating the island cluster from prior price action and a second gap in the opposite direction separating it from subsequent price action — historically observed as a sign of sharp, decisive reversal of the prior trend.
The Island Reversal was one of the more dramatic and visually compelling candlestick and chart patterns, arising from the confluence of two gaps that effectively stranded a group of candles between them with no price overlap with the sessions before or after. The first gap created the 'island' by separating the cluster from the prior trend; the second gap reversed the first by leaving a space on the other side. The result was a cluster of candles surrounded by empty space on both sides — visually resembling a price island isolated from the mainland of the broader trend.
The Bullish Island Reversal formed when a downtrend produced a downward gap (creating the island's left shore), followed by several sessions of trading within the island, and then an upward gap (creating the island's right shore) that moved price back above the left gap's level. The entire island — the sessions within it — was effectively bypassed on both sides by the two opposing gaps, implying that any participants who had committed within the island were immediately underwater after the reversal gap. The Bearish Island Reversal was structurally identical but appeared at the top of an uptrend: an upward gap formed the island, and a subsequent downward gap left the island stranded above the subsequent price action.
Island Reversals were relatively rare on daily charts of Indian equity indices and individual stocks precisely because they required gaps in both directions around a cluster of sessions. In liquid large-cap stocks and index futures, gaps of sufficient magnitude to create genuine island formations were uncommon except during periods of extreme news volatility. When they did occur — for example, in individual stocks following a surprise earnings shock that gapped price in one direction and then a subsequent development that gapped price back — the pattern attracted significant technical attention.
The Indian derivatives market provided additional context for interpreting Island Reversals. A sharp overnight gap that created an island formation on a Nifty 50 daily chart was sometimes associated with F&O expiry dynamics, foreign institutional flow reversals, or global macro surprises. The open interest configuration around the island's price zone was often used by options market analysts as additional evidence of the significance of the reversal.
The analytical significance of Island Reversals was considered to be approximately proportional to the size of the gaps and the duration of the island. A one-day island with small gaps was a less powerful signal than a multi-day island bracketed by large gaps. The speed and decisiveness of the second gap's reversal — particularly if it occurred on very high volume — was historically associated with the strongest subsequent directional moves in Indian equity market case studies.