Sonic Corp. reported higher third-quarter profit as the fast-food chain continues to benefit from higher customer traffic and larger sales checks, leading the company to again raise its projections for the year.

The drive-in chain, known for its classic '50s drive-in feel, now projects per-share profit to increase 27% to 29% for the year that ends Aug. 31, compared with its earlier view of 25% to 27%. Wall Street analysts had called for a 29.8% increase.

Shares, up nearly 26% for the year, fell 4% to $32.86 in after-hours trading.

Sonic started in 1953 in Shawnee, Okla., as a hamburger and root beer stand. It revolutionized the ordering process by installing curbside speakers that allowed customers to place orders without leaving their cars: "Service at the Speed of Sound."

The company operates more than 3,500 restaurants styled after '50s drive-ins, including car hops and servers at some locations who deliver orders on roller skates.

Overall, for the period ended May 31, Sonic reported a profit of $20.4 million, or 38 cents a share, up from $16.8 million, or 30 cents a share, a year earlier. Adjusting for tax impacts, the company's profit for the quarter was 36 cents a share. Revenue rose 8% to $164.7 million.

Analysts had projected 36 cents a share on $164.2 million in revenue.

Sales at established locations, open for at least 15 months, rose 6.1%. Last quarter, the Oklahoma City chain reported an 11.5% increase.

Sales at established locations are expected to increase in the mid-single digits.

Write to Maria Armental at maria.armental@wsj.com

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