Shares in Crowdstrike have opened nearly 15% down on the Nasdaq stock exchange in New York.
That's wiped about $12.5bn off the value of the cyber security company.
https://www.bbc.com/news/live/cnk4jdwp49et?post=asset%3Aaf518da4-ed10-42f2-906d-fc612a32be9e#post