The Securities and Exchange Board of India (Sebi) Tuesday increased the minimum contract size in index derivatives to ₹15 lakh from the current ₹5 lakh, making options trading costlier. At the same time, it reduced weekly index product offerings to just one per exchange, seeking to curb frenzied speculation among retail traders. The Securities and Exchange Board of India (Sebi) Tuesday increased the minimum contract size in index derivatives to ₹15 lakh from the current ₹5 lakh, making options trading costlier. At the same time, it reduced weekly index product offerings to just one per exchange, seeking to curb frenzied speculation among retail traders. Economic Times