COIN) were down in pre-market trading, extending a 7% slide from the previous session

The US cryptocurrency exchange revealed it had been the target of a cyberattack in which customer data was stolen and a $20m (£15m) ransom demanded

output: COIN) shares slipped further in pre-market trading on Friday, extending a 7% slide from the previous session, as the US cryptocurrency exchange revealed it had been the target of a cyberattack in which customer data was stolen and a $20m (£15m) ransom demanded to prevent its public release.

COIN) is scheduled to join the S&P 500 (^GSPC) index on 19 May, becoming the first crypto exchange to be included in the US benchmark. The company disclosed that the extortion demand was made on Sunday and said it is offering a $20m reward — equal to the amount demanded — for information leading to the arrest and conviction of those responsible.

COIN) — tricking people into handing over their crypto. They then tried to extort Coinbase (COIN) for $20m to cover this up. We said no,” the group said in a statement on its website.

COIN) shares had rallied on Tuesday following the announcement of its S&P 500 inclusion, reflecting investor optimism about the firm’s growing mainstream legitimacy. But news of the cyberattack and a separate regulatory issue has tempered market enthusiasm.

COIN) confirmed that it is facing scrutiny from the US Securities and Exchange Commission (SEC) over whether it overstated user numbers in earlier disclosures. The investigation, the company said, dates back to a previous SEC administration and concerns a metric it stopped reporting more than two years ago.

COIN) chief legal officer Paul Grewal told Bloomberg. “While we strongly believe this investigation should not continue, we remain committed to working with the SEC to bring this matter to a close.”

NFLX) shares edged up in pre-market trading on Friday after the streaming giant said its advertising-supported tier had reached 94 million users, up from 70 million in November, reflecting momentum across its business despite broader economic uncertainty.

NFLX) said spending across all tiers remains strong. In April, the company noted it had seen no significant signs of consumers pulling back, despite shifting US trade policies and concerns about discretionary spending.