Citadel Investment Group, the $14 billion hedge fund run by Kenneth Griffin, hired two bankers from Goldman Sachs Group Inc. and a portfolio manager from Fidelity Investments for its Japan office, sources said Friday.

Wataru Mizoguchi will join Citadel in Tokyo from Goldman, where he was a managing director, the sources said, declining to be identified. Toshiya Saito, who worked with Mizoguchi at a team specializing in high-yield debt and distressed assets, joined Citadel in May, they said. Yoichiro Kai joined from Fidelity last month as a fund manager and financial-industry analyst.

Japan's longest economic expansion since World War II is attracting hedge fund managers, including Nobel laureate Myron Scholes. Takeovers involving Japanese companies more than doubled to $183 billion in the first half of 2007 from a year earlier, according to data compiled by Bloomberg.