Crowds of drooling burger lovers at the Shake Shack in Grand Central Terminal in New York on Wednesday, August 12, 2015.
Crowds of drooling burger lovers at the Shake Shack in Grand Central Terminal in New York on Wednesday, August 12, 2015.
Richard Levine—Corbis via Getty Images

Shake Shack, known for its juicy antibiotic-free hamburgers and frozen custard shakes, on Thursday reported higher-than-expected first-quarter restaurant sales, sending its shares up nearly 9%.

The company said the recent launch of its Chick’n Shack sandwich at U.S. stores helped same-restaurant sales rise to 9.9%. That topped average expectations for a 5.3% increase, according to research firm Consensus Metrix.

The New York-based restaurant chain reported a net profit of $1.5 million, or 7 cents per share, compared to a net loss of $12.7 million, or $1.06 per share, in the year-ago period.

Adjusted earnings were 8 cents per share. Analysts on average had expected 5 cents, according to Thomson Reuters I/B/E/S.

The burger joint’s stock price peaked at $92.86 in May 2015 and has since dropped by more than 63%.

The stock pared gains to about 5% at $36.00 in after-hours trading.

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