By employing intraday tick data due to big data concerns, we examine whether investors profit by day trading China Stock Index 300 Futures (C300F) as the C300F index rises (falls) over considerable points in a minute defined as intraday large price change. We argue that the intraday large price change might induce investors to trade the C300F. Results reveal that investors are likely to make profits by taking short positions on the C300F right after the occurrence of the intraday large price change, except when the C300F falls from extremely high points like 20 points in a minute.
