Coinbase (COIN, Financials) shares dropped more than 7% Thursday after the crypto platform disclosed a cyberattack and confirmed an ongoing Securities and Exchange Commission investigation.

Warning! GuruFocus has detected 6 Warning Signs with COIN.

The stock fell to just above $244, giving up gains from earlier in the week when Coinbase was set to join the S&P 500 index. The drop pushed its 2025 performance back into negative territory.

The company said in a filing that on May 11 it received a ransom email from an unidentified actor claiming to have accessed customer account data and internal company files. Coinbase believes international contractors and employees were paid to extract the data.

The threat actor demanded payment to keep the data from going public. Coinbase said it has not paid and is cooperating with law enforcement. It estimates the financial impact of the breach will be between $180 million and $400 million, covering remediation efforts and voluntary reimbursements.

Coinbase said passwords and customer funds were not accessed. However, exposed data may include names, addresses, phone numbers, masked bank account details, and transaction histories.

Separately, Coinbase is under investigation by the SEC for its prior use of the verified users metric, which the firm used through 2021 and removed from filings in 2023. The company now focuses on monthly transacting users.

Coinbase said the probe is a holdover from the Biden administration and argued that the metric was fully disclosed when in use.

The company reaffirmed its cooperation with regulators but urged the SEC to close the investigation.

This article first appeared on GuruFocus.

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