Mealey's (October 14, 2021, 8:42 AM EDT) -- SAN FRANCISCO — A medical device maker that manufactures and distributes hearing aids and two of its senior executives violated federal securities law by failing to disclose to investors that the company was the subject of a federal criminal investigation into its billing and reimbursement practices with insurers, causing the company’s financial results to be impacted, a shareholder alleges in an Oct. 6 class complaint filed in California federal court....