D.E. Shaw & Co.

The D. E. Shaw group is a global investment and technology development firm with more than 1,100 employees, approximately US$ 23 billion in investment capital as of 1 November 2011, and offices in North America, Europe, the Middle East, and Asia. It has a presence in many of the world's capital markets, investing in companies and financial instruments within the major industrialized nations and a number of emerging markets.