An Apple Business Manager account, which allowed users to log in to a business for purchase, was hacked in April and sold to a company for $1.2 million.
The stolen information included personal details of more than 300 people, including email addresses, bank account details and Social Security numbers, according to court documents.
The Apple business manager account, and its associated user data, was sold on Aug. 31 to the Chinese company Wuhan Wanda Technology Technology Group for about $2 million, according the court documents filed Friday.
It was not immediately clear if the company had sold the information to another company.
Apple declined to comment on the case.
The case, first reported by Bloomberg, was the latest cybersecurity breach to hit the tech giant, which also operates as the parent company of Apple and other major tech companies.
In March, Apple said its servers had been breached, and the company said it was looking into the matter.
Apple was also at the center of an earlier cybersecurity incident in which a company called Cloudflare used a code to remotely crack a password and access files from iCloud accounts.