These six investors made $1 billion-plus last year

George Soros
Justin Solomon | CNBC

An elite group of hedge fund managers once again proved they could literally make billions of dollars in a single year.

Six men made at least $1 billion in 2013, according to estimates from Forbes on the 25 highest-earning hedge fund managers and traders last year.

They are George Soros of family office Soros Fund Management ($4 billion); David Tepper of hedge fund firm Appaloosa Management ($3.5 billion); Steve Cohen of soon-to-be family office SAC Capital Advisors ($2.3 billion); John Paulson of hedge fund firm Paulson & Co. ($1.9 billion); Carl Icahn of activist investment shop Icahn Enterprises ($1.7 billion); and James Simons, the retired founder of quantitative trading hedge fund firm Renaissance Technologies ($1.1 billion).

Rounding out the top 10 of the Forbes list were four other hedge fund managers: Ray Dalio of macroeconomic-focused Bridgewater Associates ($900 million); Ken Griffin of multistrategy Citadel ($900 million); Larry Robbins of stock and credit-focused Glenview Capital Management; and Leon Cooperman of stock picker Omega Advisors.