One of the world's largest asset managers, Fidelity Investments, confirmed on Wednesday that 77,000 customers had had their personal information compromised in an August data breach.

The Boston, Mass.-based investment firm disclosed in a filing with Maine's attorney general the nature of the breach. An unnamed third party had accessed information from its systems between August 17 and August 19 "using two customer accounts that they had recently established," according to the company's filing.

"We detected this activity on 19 August and did promptly cut off access," Fidelity said in a letter it sent to the victims, adding that the breach did not entail access to Fidelity account holders' customers.

The breach has affected 77,099 customers, and Fidelity's review of the compromised data, which is now complete, reveals that customers' personal information was hit. How exactly two Fidelity customer accounts were breached enabled hackers to gain access to thousands of other customers' data is not immediately clear.
The financial giant hasn't disclosed what types of personal data were compromised.

Still, a spokesperson has yet to comment on TechCrunch's questions, and the breach isn't shown on the company's website as of writing.

The company claims that it has over 51 million individual investors as customers and holds over $14.1 trillion in total customer assets as of June 2024.