And the top-ranked hedge fund for 2015 is ...

Hedge Fund

The best-performing hedge fund in 2015 came from an unusual place: London.

That's according to Institutional Investor's Alpha's rankings of last year's best performing firms released Thursday. The analysis put Marshall Wace, a relatively little-known $22 billion firm in which KKR took a 24.9 percent stake last summer.

Another U.K.-based fund took second place. The Children's Investment Fund was "rewarded for several years of hard work revamping its relationship with investors following a year of bad performance and a rash of redemptions," according to the publication's analysis.

Rounding out the top five receiving "A" grades were Boston-based Adage Capital Management, Ken Griffin's Chicago-based Citadel, and the stellar Two Sigma fund, based in New York.

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The lowest-ranked funds were Brevan Howard Asset Management, Perry Capital, David Einhorn's Greenlight Capital and BlueCrest Capital Management.

See Institutional Investor's report here.

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