These Two Firms Account For One-Fifth of All Equity Trading In The U.S.

Well that would be a stunning statistic. High Frequency Trading is slowly taking over the markets. We spotted this today:

"No-one can be sure quite how successful these quant programs are, but as Mr Patterson says: "They have been around long enough now to assume they are extremely profitable".

Their proliferation would certainly suggest so. One commentator says two of the biggest HFT firms, Tradebot and Getko, alone account for about 15%-20% of all equity trading in the US.

As private companies, it's hard to know precisely how far their influence extends."

Statistics Source: BBC.