Trader Brian Jones on Twitter: "Keep in mind. It hasn't been easy making money long the S&P. You have to be very careful and nimble how you trade long. Locking in some profits on day like today is important." / Twitter

Keep in mind. It hasn't been easy making money long the S&P. You have to be very careful and nimble how you trade long. Locking in some profits on day like today is important.