Potbelly is giving some indigestion -- but probably not with its delicious sandwiches. The day-one IPO darling has seen its stock skitter downwards in recent months, while other food sector IPOs like Zoe's Kitchen and Noodles have tasted better for investors. Next, stocks like El Pollo Loco will hit the market and Potbelly will take on tasty competitors like Jersey Mike's and Jimmy John's. Today is earnings day for Potbelly's, which at least isn't disappointing there, but the stock will need some seasoning, especially with one of the company's early stage investors still holding a big slug of stock.

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