John Hancock Investments has closed its Disciplined Value Mid Cap Fund to new investors, the Boston-based firm announced today.

Existing shareholders will be eligible to purchase shares of the fund under certain circumstances, according to the firm.

“Closing the fund to most new money enables the managers to remain invested in what they consider to be their best ideas, without the burden of putting large amounts of cash to work immediately,” said Andrew G. Arnott, president & CEO, John Hancock Investments. 

Assets under management in the fund were $6.68 billion, as of December 31, 2013.

Steven Pollack and Joseph Feeney Jr. of Robeco Boston Partners manage the fund.