Restaurant-chain operator Inspire Brands announced Wednesday it is adding Jimmy John's Gourmet Sandwiches to its repertoire of offerings. The privately held multi-brand restaurant company owns Arby's, Sonic, Buffalo Wild Wings and Rusty Taco.

The acquisition will make Inspire the fourth-largest restaurant company in the U.S., with more than $14 billion in annual sales across 11,200 restaurants that span 16 countries, Inspire said in a statement. Terms of the deal weren't disclosed. The transaction is expected to close next month.

"Jimmy John's has found the ideal home at Inspire," said Jimmy John's founder and CEO, Jimmy John Liautaud. "Inspire's long-term approach, culture of innovation and commitment to helping brands grow sets it apart from the rest."

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Backed by private equity firm Roark Capital Group, Inspire was formed in 2018 when it merged Arby's and Buffalo Wild Wings. It announced the $2.3 billion acquisition of Sonic in September of that year. The first Jimmy John's opened in 1983 in a garage near Eastern Illinois University in Charleston.