Potbelly, which raised $105 million from the stock sale, is the latest in the a hot streak of initial public offering. It is on track to be the fourth to more than double on its first day of trading this year.

Fellow restaurant chain Noodles & Co. (NDLS) also doubled on its first day in June. Organic food companySprouts (SFM) and software firm Benefitfocus(BNFT) also rose more than 100% on their market debuts. That’s a pretty rare feat following the bursting of the Internet bubble. Only six companies doubled on their first day of trading between 2001 and 2012, according to Renaissance Capital.

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If Potbelly closes above $33, it would be the biggest first-day gain for a U.S.-listed IPO since a 161% surge for Chinese online video firm Youku.com (YOKU) in December 2010. (Youku has since merged with rival Tudou.)

Potbelly started in 1977 as a small antique shop in the Windy City that began serving toasted deli sandwiches to boost sales.

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