India's securities regulator, Sebi, is taking action against global financial giants for allegedly sharing trade data and engaging in insider trading. The crackdown involves several high-profile companies and executives, including those from EY and PwC, who are accused of exploiting confidential information for financial gain. The extent of the crackdown and the specific companies and individuals involved are still emerging, with reports citing various cases and amounts, including a notable instance involving a Rs 173 crore windfall.