3:40 PM -- The $2.2 billion Bain Capital buyout has 3Com Corp. (Nasdaq: COMS) stock trading at a volume of 104 million shares today, as of this writing. That's more than 14 times its average.

It's the highest volume of the day. Second place goes to Standard & Poor's Depository Receipts (SPDRs) at about 77 million shares.

— Craig Matsumoto, West Coast Editor, Light Reading