Buildup & Unwinding Analysis tracks the change in Open Interest (OI) per strike to identify position buildup (new positions) and unwinding (position closures). Buildup occurs when OI increases (positive change in OI), while unwinding occurs when OI decreases (negative change in OI). This reveals where option writers are entering or exiting positions, signaling directional conviction or profit-taking.

• Call buildup + price rising: Bullish continuation, fresh call sellers expect resistance
• Put buildup + price falling: Bearish continuation, fresh put sellers expect support
• Call buildup + price falling: Bearish signal, call sellers comfortable at lower levels
• Put buildup + price rising: Bullish signal, put sellers confident in higher levels

• Call unwinding + price rising: Short covering, bullish acceleration as sellers exit
• Put unwinding + price rising: Profit booking, bullish momentum may slow
• Call unwinding + price falling: Bearish signal, failed resistance
• Put unwinding + price falling: Stop-loss triggers, bearish acceleration as support breaks

Look for strikes with largest positive change in OI. ATM and near-ATM buildup indicates immediate positioning. Far OTM buildup suggests hedging or anticipation of large moves. Compare CE vs PE buildup at the same strike: if both build, it signals uncertainty; if one side dominates, it shows directional bias.

Track real-time OI changes during the session. Fresh buildup at key strikes combined with price momentum confirms trend continuation. Unwinding at support or resistance strikes warns of level breakdown. Watch for sudden buildup shifts: rapid CE buildup near highs = potential reversal zone. Always combine buildup analysis with price action and volume.