Mollie Stone's Markets disclosed a phishing incident on March 17, 2017, where an employee received a fraudulent email appearing to be from a senior executive. This led to the unauthorized access of an email account containing IRS Form W-2s for 2016, exposing employees' names, addresses, Social Security numbers, and wage information. The company secured the account, notified the IRS and federal law enforcement, and is offering three years of identity theft protection to affected employees.