Investigating a potential class action lawsuit against Under Armour due to a data breach related to its MyFitnessPal app. Approximately 150 million user accounts are affected, and the breach occurred in February 2018; however, Under Armour did not know until March 25, 2018. The stolen information includes names, email addresses and hashed passwords. If you use or have used the Under Armour MyFitnessPal app and believe your data has been compromised, please submit your information below.