(Bloomberg) -- The dollar rally is proving a boon for an exchange-traded fund provider backed by former hedge-fund manager Michael Steinhardt.

WisdomTree Investments has gained 33 % this year, driven by the success of two exchange-traded funds that let investors buy European and Japanese stocks while avoiding the decline in the currencies. The company’s European fund has attracted $7.4 billion in 2015, the most of any U.S. ETF, and the Japan fund has won $2.2 billion, according to data compiled by Bloomberg.

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