By Angela Chen 

Shake Shack Inc. on Wednesday raised its revenue guidance for the year as the boutique burger chain reported sales grew a better-than-expected 56% in the quarter ended April 1.

The company's share price--which has more than tripled since being priced for the stock's initial public offering in January--surged 6.6% to $72.90 in recent aftermarket trading.

The New York-based company now expects revenue of between $161 million and $165 million, up from its previous forecast range of $159 million to $163 million. Analysts, however, had been expecting $165 million.

In the latest reporting period, total revenue--which includes restaurant sales and licensing revenue--reached $37.8 million, above estimates of analysts polled by Thomson Reuters for $34 million. Sales at domestic company-owned restaurants open at least two years rose 12%.

But Shake Shack also reported a loss of $12.7 million, or $1.06 a share, hurt by costs connected to the company's initial public offering, compared with a year-earlier profit of $1.1 million, or four cents a share. Excluding the IPO costs and other one-time items, the company's per-share earnings rose to four cents from two cents a year earlier. On that basis, analysts had expected a per-share loss of three cents.

Shake Shack is among a wave of so-called fast casual chains across the restaurant industry that offer fresh, made-to-order items. While still tiny compared with giants like McDonald's Corp., upmarket burger chains have been popular of late.

Shake Shack opened three domestic company-owned locations during the quarter, including its first restaurant in Baltimore. The company said Wednesday that it remains on track to open at least 10 new domestic company-operated Shacks and five new international-licensed restaurants in 2015.

Some analysts had been skeptical about whether Shake Shack would be able to hold on to its lofty valuation once it reported its quarterly results. The shares more than doubled in their stock-market debut Jan. 30, ending at $45.90, up from their initial public offering price of $21.

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

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