Open interest buildup means new positions, not just price. When OI rises at a call strike with price up, money is committing bullish; the same holds for puts down. The signal is clearest at ATM plus/minus two strikes where liquidity concentrates.
Feature oi_buildup equals the change in OI at those strikes, signed by direction. Combine with PCR: bullish OI plus PCR below one is genuine confidence; bullish OI plus PCR above 1.3 is hedging, not conviction. AI weights oi_buildup against iv_skew and vix_india.
Q: What is OI buildup?
A: New open positions at a strike, showing where traders are committing capital.
Q: Where is the signal strongest?
A: At ATM plus/minus two strikes where liquidity and conviction concentrate.
Q: Bullish OI but high PCR — what then?
A: Often hedging rather than conviction; the model waits for confirmation.
Q: Is OI a standalone signal?
A: No — combine with PCR, IV skew and regime before acting.
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By Shakti Tiwari · Options AI research pillar. NISM XII certified. Educational only, not investment advice; verify before acting.