NEW YORK (TheStreet) --The Potbelly Corporation (PBPB) - Get Report opened 5.43% higher to $18.05 on Friday following news William Blair raised the sandwich company's rating to "outperform" from "market perform."

The firm changed their rating seeing limited downside due to valuation and high interest in the name. William Blair also believes investor enthusiasm could be sparked by improving same store sales trends.

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STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.