NEW YORK (TheStreet) --Shares of Potbelly Corp. (PBPB) - Get Report are down by -24.71% to $11.03 on heavy volume in late-afternoon trading on Thursday after the company cautioned it will see a 1.6% decrease in comparable store sales for the 2014 second quarter, compared to a 3% growth for the year ago period.

The sandwich and salads restaurant chain is expecting an increase in revenue for the second quarter to $83.6 million, but that figure falls short of the $87 million analysts are expecting.

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