Watch Cashin: More selling likely if this happens By: CNBC.com News May 20, 2014 at 13:03 PM EDT Art Cashin of UBS Financial Services tells CNBC's Bob Pisani why investors should be watching for a key level on the Nasdaq. Read More >> Related Stocks: Cato Corp Dick's Sporting Goods Inc Sentinelone Inc Cl A TJX Companies Twitter, Inc. Urban Outfitters