Mumbai, July 8 -- A staggering 91% of individuals trading in equity derivatives incurred net losses in the six months ended May 2025, a new study by the Securities and Exchange Board of India (Sebi) found. The Sebi report covered trading activity from December 2024 to May 2025, analysing the impact of a string of measures issued by Sebi in October 2024 to strengthen the equity index derivatives framework and enhance investor protection. Sebi's measures which debuted between November 2024 and April 2025 included rationalising weekly and monthly index derivatives, increasing contract sizes, mandating upfront premium collection, and tightening position limit monitoring. These steps were designed to address concerns over the explosive growth in...