U.S. stock and bond mutual funds lost $18 billion more in investor assets in February than they attracted.

The funds reported a total of about $20 billion in net inflows in February 2008, according to the Financial Research Corp., Boston.

Corporate bond funds bucked the trend, registering net inflows of $11 billion, up from net inflows of $6.4 billion in February 2008.

Domestic equity funds bled the most in February, with net outflows increasing to $23 billion, from $6.5 billion. International-global equity funds reported $13 billion in net outflows, compared with about $13 billion in net inflows in February 2008, FRC says.