The greater the OI, the more money flows into a market. FPIs, for the first time since Sensex options were relaunched in May 2023, held 10.31% of total open interest beginning May of FY26. Thereafter, the OI slumped to zero for the next four months before recovering in October and ending in March 2026 at 9.09%, or ₹20,056 crore, per Securities and Exchange Board of India (Sebi) data.
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