NEW YORK (MarketWatch) -- U.S. burger chain Shake Shack on Monday filed for an initial public offering of up to $100 million of shares. The company said it plans to list on the New York Stock Exchange under the symbol "SHAK." J.P. Morgan, Morgan Stanley, Barclays, Goldman Sachs & Co, Jefferies, William Blair and Stifel are joint underwriters on the deal. The company, which has 63 outlets in the U.S. and overseas, said it had total sales of $82.5 million in 2013, up from $57 million in 2012 and $19 million in 2010.