Bloomberg reported that Moody’s Investors Service will start cutting the credit ratings of more than 100 banks this month, a move that risks pushing up their funding costs and forcing them to curb lending in a threat to economic growth.

According to the report, BNP Paribas SA, Deutsche Bank A, Morgan Stanley are among firms that face having their short- and long-term debt downgraded to their lowest-ever levels by Moody’s, the ratings company said in February. The cuts, which would follow downgrades by Standard & Poor’s and Fitch Ratings last year, could erode profits, trigger margin calls and leave some firms unable to borrow from money- market funds that have strict rules on who they can lend to. Without access to funding from private sources, banks have had to sell assets and reduce lending.

“I’d like to say the views of the rating agencies don’t matter anymore but, unfortunately, they do,” said Philippe Bodereau, London-based head of European credit research at Pacific Investment Management Co., the world’s largest bond investor. “This is a setback for the banks, particularly when you consider how much progress they have made in making themselves safer and more transparent.”