Potbelly Corp. is backed by private equity firm Oak Investment Partners. The sandwich maker filed an initial public offering (IPO) of common stock with US regulators. The company planned to raise USD75 million.

Potbelly Corp. was established in 1977 and headquartered in Chicago, Illinois. The Chicago-based company also serves milkshakes, baked cookies and salads.

The underwriters for the said IPO included BofA Merrill Lynch and Goldman Sachs. This was according to a preliminary prospectus filed with the US Securities and Exchange Commission. The filing did not disclose the number of shares that the company planned to sell of its expected price.

A portion of the net proceeds of the initial offering would be used to pay a previously declared cash dividend. Another portion from the proceeds would be used for working capital purposes.

Potbelly Corp. reported an annual revenue of USD274.9 million for 2012 with a net profit of USD24 million. The company intends to list its common stock on the Nasdaq under the trading symbol "PBPB".