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Shares of Domino's Pizza (DPZ - Get Report)  were up more than 6% Wednesday after the company reported first-quarter profit ahead of expectations, though revenue fell short.

The pizza chain reported a 4.4% increase in profit to $92.7 million, or $2.20 per share, topping analysts' expectations of $2.09. 

Revenue for the period grew 6.4% to $836 million, which was short of Wall Street's $843.5 million expectations. 

Same-store sales, or stores open at least a year, grew 3.9% in the quarter, down from the 8.3% growth the company reported a year ago and short of the 4.9% growth analysts polled by FactSet were expecting. 

"It was a good quarter for our U.S. business, and I am very pleased with our balanced retail sales growth, driven by a healthy combination of solid same-store sales and unit growth," said Ritch Allison, Domino's CEO.

"We remain focused on improving international comps, but I am encouraged by the strong unit growth in the first quarter - and remain confident in the fundamentals related to market share, retail sales growth and unit economics within this terrific segment of our business."