T-Mobile US Inc. has confirmed that it is investigating claims that a hacker is attempting to sell the personal data of more than 100 million customers.

Vice’s Motherboard first reported the incident Sunday, in which a hacker on an online forum claimed to be selling private data that includes names, Social Security numbers, addresses, phone numbers and drivers license information. Motherboard was in contact with the seller, and confirmed that the data it saw appeared to belong to T-Mobile customers. The anonymous seller is reportedly seeking 6 bitcoin — about $270,000 — for data belonging to about 30 million accounts, with the rest supposedly being sold through private channels.

The hacker told Motherboard that T-Mobile had successfully regained control of its servers, but not before the trove of personal data had already been downloaded.

T-Mobile said Monday it is investigating the claims with digital forensics experts and is working with law enforcement.

“We have determined that unauthorized access to some T-Mobile data occurred, however we have not yet determined that there is any personal customer data involved,” T-Mobile said in an emailed statement Monday. “Until we have completed this assessment we cannot confirm the reported number of records affected or the validity of statements made by others.”

The company said it intends to offer more details “Once we have a more complete and verified understanding of what occurred.”

The data breach, if confirmed, could affect nearly every T-Mobile customer in the U.S.; in its second-quarter earnings report last month, the telecom company reported about 104.79 million U.S. customers, according to FactSet data.

T-Mobile has reported a number of serious data breaches in the past few years, most recently in December 2020. Those breaches were significantly smaller than the new one claims to be, with about 200,000 customers affected by the most recent one.

T-Mobile shares
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are up more than 7% year to date, and up about 26% over the past 12 months, compared to the S&P 500’s
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gains of 19% and 32%, respectively, over those periods.

Updated with T-Mobile’s latest statement Monday.

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