Change in Open Interest refers to the net increase or decrease in the total number of outstanding futures or options contracts from one trading session to the next. Analysing OI change alongside price movement reveals whether a trend is being driven by new positions (increasing OI) or by existing positions being unwound (decreasing OI). A price rise with increasing OI suggests fresh bullish conviction; a price rise with decreasing OI suggests a short-covering rally which may be less sustainable. In the Indian F&O market, daily change in OI data available on NSE's website and most charting platforms is a critical tool for understanding the positioning dynamics behind price moves across index and stock derivatives.
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