Why 3M, Trex, and Middleby Stocks All Tumbled 10% Today

3M (NYSE: MMM). Trex (NYSE: TREX). Middleby Corp (NASDAQ: MIDD).

On the face of it, these three companies don't seem to have a lot in common. One makes Post-It notes; another, "fake wood" planks for outdoor construction; the third -- pizza ovens. And yet, shares of 3M, Trex, and Middleby all fell in near lockstep today, down more than 10% apiece in early trading and recovering to post losses of "only" 9.6%, 9.3%, and 10.2% as of 12:35 p.m. EDT.

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Source Fool.com