New Delhi, Aug. 27 -- An increase in foreign institutional participation has resulted in non-expiry day volumes on BSE to increase sharply from fiscal year 2024-25 (FY25) to FY26, market experts said, citing the Securities and Exchange Board of India's (Sebi) recent study titled "profitability of individual traders in the equities derivatives segment FY25-FY26".

The study, released earlier this month, examines both expiry and non-expiry average daily premium turnover over three periods-pre-policy tightening (April-October 2024), immediate post-policy (December 2024 -March 2025), and the recent period (October 2025-March 2026).

The regulatory tightening refers to tripling contract size, rationalizing weekly expiries to one per exchange f...