Krispy Kreme says it's under what it calls an "informal, nonpublic inquiry" by the Securities and Exchange Commission.
The North Carolina-based firm recently blamed its first quarterly loss on the low-carb dieting phenomenon.
In a statement, the firm says it's cooperating fully with the SEC. The firm says the inquiry is focused on its franchise reacquisition and its guidance on a reduction in earnings.
In May, Krispy Kreme, with restaurants in Alabama, reported that it lost $24 million in the first quarter, its first quarterly loss since going public in 2000.
Shortly before that, the doughnut maker says it was cutting profit projections for this year by 10 percent because of lower demand for its high-calorie treats, which is due in part to the low-carb diet phenomenon.
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Krispy Kreme History
Source: A collection of web reports contributed to this report.
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