Congress leader Rahul Gandhi on Tuesday demanded the Securities and Exchange Board of India (SEBI) to reveal the names of “big players” profited in the futures and options (F&O) trading what he described as “making a killing at the expense of ordinary investors” in the stock market. The comments come a day after the market regulator, in a report, said that nine out of 10 individual investors suffered losses in the F&O segment in the last three years.