Rialto Markets LLC, a broker-dealer, disclosed a data breach affecting a single employee's email account. Unauthorized access occurred between November 30, 2021, and February 25, 2022. The attacker accessed files containing customers' personal information, including names, Social Security numbers, and dates of birth. Rialto engaged forensic experts, secured the account, and provided two years of complimentary identity monitoring via Kroll to affected individuals.