By Angela Chen 

Shake Shack Inc., fresh off a successful initial public offering last month, will add to its expansion efforts by opening its first restaurant in Tokyo next year and building nine more in Japan by 2020.

The company has joined with with Sazaby League Ltd., which helped Starbucks Inc. expand in Japan.

Shake Shack, a New York-based "fast casual" restaurant known for its burgers and crinkle-cut fries, unveiled plans to expand beyond its existing 36 restaurants stateside and 27 international locations when it filed to go public late last year. According to its regulatory filing, the company plans to build 450 Shake Shacks in the U.S. by adding 10 new ones each year domestically and will license additional restaurants abroad "opportunistically."

Shares of Shake Shack more than doubled last month in their market debut, indicating the appetite that investors have in these fast-casual restaurants. Investors and analysts said the appeal of Shake Shack's shares lie mainly in the chain's growth prospects. Shares of so-called fast-casual restaurants have been gobbled up by investors in recent IPOs, in part on a bet that consumers will be spending more money eating out as falling gas prices leaves more money in consumers' pockets after filling up their car's gas tanks.

Shake Shack's stock opened at $47.21, well above its initial public offering price of $21, which had valued the chain at $745.5 million. They quickly hit a high of $52.50 before retreating. The shares, which trade on the New York Stock Exchange under the symbol "SHAK," ended their first day at $45.90.

The chain has been profitable since at least 2012 and reported $3.5 million in profits for the 39 weeks ended Sept. 24.

Write to Angela Chen at angela.chen@dowjones.com

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