These two guys made $1.7bn each last year

Gold Dollar

Not bad for 12 months work.

Consider 2015 to be the year the hedge-fund industry completed the crossover to the digital age.

Computerized trading strategies helped the nearly $3 trillion industry's biggest players reap the biggest profits. Fully six of the top eight moneymakers for the year use so-called quant approaches to generate profits.

Tops among them were Ken Griffin at Citadel and James Simons at Renaissance Technologies, both of whom reeled in $1.7 billion according to the year's Institutional Investor's Alpha Rich List of the top hedge fund managers. (Get the full top 25 list and analysis here.)

Overall, it was a tough slog for the industry. Returns were middling, with the HFRI fund weighted composite index falling 1 percent, only the fourth full-year decline since 1990. Assets, however, edged higher, rising $51.7 billion to $2.97 trillion, according to HFR.

It took less to make the Rich List, with the median income at $275 million, the lowest in five years. The average stood at $517,.6 million, a slight uptick from 2014 but off 40 percent from the $846 million in 2013. To be considered for inclusion on the list, managers had to make $135 million, the lowest since 2011.

Nearly half of hedge funds lost money, according to Institutional Investor, and some familiar names on the Rich Lists of years past were missing, including John Paulson of Paulson and Co., Leon Cooperman of Omega Advisors, and Daniel Loeb at Third Point.

These industry leaders , however, did make the list, and qualified for the top 10:

1. Ken Griffin - Citadel, $1.7 billion

1. James Simons - Renaissance, $1.7 billion

3. Ray Dalio, Bridgewater - $1.4 billion

3. David Tepper, Appaloosa - $1.4 billion

5. Israel Englander, Millennium Mgmt - $1.15 billion

6. David Shaw, D.E. Shaw, $750 million

7. John Overdeck, Two Sigma - $500 million

7. David Siegel, Two Sigma - $500 million

9. O. Andreas Halvorsen, Viking Global - $370 million

10. Joseph Edelman, Perceptive Advisors - $300 million

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