(Bloomberg) -- Janus Capital said the head of its fundamental fixed income unit, who oversaw an eight-fold increase in the firm’s bond assets over the past decade, is leaving.

Shares of the money manager fell the most in nine months after the company said Gibson Smith, 47 and head of the business since 2006, will leave at the end of March to spend more time with his family. Enrique Chang, who joined two years ago, will become head of investments on April 1, overseeing both the fundamental fixed income and the equity investment teams, Janus said in a statement.

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