Stock-based funds helped U.S. mutual funds attract $20 billion more in assets in June than they lost.

Financial Research Corp., Boston, says fund net asset flow was down from $23 billion in June 2007.

Net inflow into stock funds increased to $16 billion, from net outflow of $337 million.

Net inflow into corporate bonds fell to $1.7 billion, from $5 billion.

Investors pulled $492 million out of international-global funds. In June 2007, the funds attracted $17 billion in net inflow.