Sonic shareholders approve sale Thursday was a bittersweet day at Sonic Corp.'s headquarters. The company's shareholders approved the pending merger agreement with Inspire Brands, the parent company to Arby's and Buffalo Wild Wings. Inspire is purchasing Sonic for $2.3 billion. With the sale, Sonic will no longer be publicly traded, so Thursday's meeting was the last gathering of the shareholders. They will be paid $43.50 per share in cash as part of the sale.