Tudor Investment Corp's flagship portfolio, has been reported to have halted redemptions so they can segregate difficult-to-sell assets in the fund from those they can offload more easily.

Founded in 1980 by Paul Tudor Jones II, the firm currently manages $15.4 billion. The firm's investment strategies include global macro trading, fundamental equity investing in the U.S. and Europe, emerging markets, venture capital, commodities, event driven strategies and technical trading systems.