China MediaExpress Holdings, Inc. (fka CCME)

[viking86]

these guys can shoot pretty quick acc. to this:

Portfolios are often reoptimized on a more-or-less continuous basis, with a steady stream of trades executed to take advantage of newly emerging potential profit opportunities and/or to manage various forms of dynamically varying risk. Time-sensitive trading decisions are often made very rapidly using real-time data obtained from various sources throughout the world's financial markets. The firm trades on nearly a 24-hour basis, and typically executes tens of thousands of transactions per day.