Here is one of the link about SEBI action and its impact on stock market , This is an interesting one , since comment is from managing director of a stock exchanges , especially these few lines which reads …The move to physically settle these 46 stocks lowered the speculative activity and volume in derivatives and cash markets, two exchange officials told BloombergQuint requesting anonymity. , ….Also, foreign investors who prefer to cash settle derivatives may look at Singapore Exchange as an option. SGX introduced stock futures in 50 Nifty stocks last year…Investors settling derivatives contracts physically will have to pay a tenfold higher securities transaction tax than those who settle in cash