Putnam, a unit of Canada's Great-West Lifeco , said in a statement that the board of trustees of its funds had voted to close the institutional money market fund as it faced "significant redemption pressure" on September 17.

"The trustees' action was not related to the portfolio's credit quality, but was instead a reaction to marketwide liquidity issues," the fund company said.

(Reporting by Muralikumar Anantharaman; Editing by Lisa Von Ahn)