By Kirsten Grind 

Bill Gross in January took in his lowest amount from investors since he took the helm of a new mutual fund at Janus Capital Group Inc. about four monthsago, according to new data Monday from fund research firm Morningstar Inc.

Mr. Gross saw investor inflows of about $86 million into the Janus Global Unconstrained Bond fund last month, down from $176 million in December, according to Morningstar. Assets in the fund total $1.5 billion, although Janus confirmed reporting from The Wall Street Journal last month that Mr. Gross has invested "more than $700 million" into the fund himself.

A Janus spokeswoman didn't immediately return a request for comment.

Mr. Gross took over running the Janus fund in early October following an abrupt departure from his longtime firm, Pacific Investment Management Co., where he was chief investment officer and co-founder.

The weak inflows into Mr. Gross's fund in January come as all of Janus' mutual funds saw a net outflow of $17.8 million for the month, according to Morningstar. Mr. Gross was widely expected by analysts and industry observers to help buoy Janus, which has suffered from years of investors pulling their money from its funds.

Write to Kirsten Grind at kirsten.grind@wsj.com

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