ALISO VIEJO, Calif. -- Johnny Rockets, the Southern California-based burger chain with 1950s flair, has been sold to a private equity firm that targets underperforming and specialty companies.

The Orange County Register reported Tuesday (http://bit.ly/10tQxV1) that Sun Capital Partners has purchased the company, which is headquartered in Aliso Viejo.

Terms of the deal were not disclosed.

John Fuller, the chain's chief executive, says the new owners want to expand the chain and find ways to help it cut costs.

Johnny Rockets, founded in 1986, currently has about 300 restaurants in 30 states and 16 countries.

Sun Capital's portfolio includes Captain D's, Fazoli's and Boston Market.

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Information from: The Orange County Register, http://www.ocregister.com

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