Nomura named Samir Patel and Michael Rietbrock coheads of the brokerage's equity business in the Americas to replace Ciaran O'Kelly as the firm recalibrates its overseas operations.

Patel, who joined Nomura from Bank of America Corp. in 2009 as cohead of derivative sales, has been in charge of execution sales the last two years, David Findlay, chief executive officer of the Americas unit, wrote Thursday in a memo obtained by Bloomberg News.

Rietbrock, 43, joined the firm in 2010 from Bank of America as head of U.S. equity research.