Ken McCarney was named CEO at Mitsubishi UFJ Fund Services, the alternative fund administration unit of Mitsubishi UFJ Trust and Banking Corp.
Mr. McCarney replaces Glenn Henderson, who retired from the position but remains as an adviser to the business.
Mr. McCarney will retain his previous title of chief operating officer and will not be replaced.
Mitsubishi UFJ Fund Services has $165 billion in assets under administration, spokesman Anthony Cornwell said.
As COO, Mr. McCarney oversaw the acquisition of hedge fund administrator Meridian Fund Services Group in March 2014.
Mitsubishi UFJ is a fund administrator for hedge funds, private equity, real estate, mutual funds and family offices. The business' predecessor, Butterfield Fulcrum Group, was acquired and renamed by MUFJ in August 2013.