Potbelly Corporation set the terms for its IPO September 23. If you include the underwriters over-allotment, the... morePotbelly Corporation set the terms for its IPO September 23. If you include the underwriters over-allotment, the Chicago-based sandwich shop is selling 8.49 million shares to the public at between $9 and $11. While it's tempting to take a bite out of this...