What follows is a look at stocks in the S&P 500 displaying unusual volume in today's trading session.
Some of the highlights include: Airgas (ARG), which shares are trading 1,700% above their 10-day average volume after Air Products and Chemicals (APD) made an unsolicited $5.1-billion cash bid for the company.
Other companies displaying unusual volume in today's session are Pitney Bowes (PBI), Dun & Bradstreet (DNB) and Reynolds American (RAI).
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