The case is LTL LED LLC v. Google LLC (D. Minn.); see pp. 104 of this PDF onwards for the amended complaint. The lawsuit was filed in March in Minnesota trial court, but was just removed to federal court. The plaintiffs are the business and four of its officers, all of whom were also mentioned by name in some Google AI Overviews (assuming the exhibits attached to the Complaint are correct).

The Complaint claims that none of the sites linked to by the report actually reported that Wolf River had ever faced a Minnesota AG lawsuit, or was guilty of the other misconduct. According to the Complaint,

Google cited numerous sources in support of its false assertions; however, none of the referenced materials in fact contained the information Google claimed they did.

The Complaint also alleges specific lost business: