Fidelity Investments has confirmed a data breach that compromised the personal information of 77,000 customers. The breach occurred between August 17 and August 19, when an unnamed third party accessed information using two newly established customer accounts. Fidelity detected the unauthorized access on August 19 and promptly terminated it, stating that customer accounts were not accessed. The exact types of compromised data remain unclear, and Fidelity has not provided additional details on its website. The firm currently serves over 51 million individual investors, managing approximately $14.1 trillion in total customer assets.