Marine services provider James Fisher and Sons said hackers gained unauthorised access to its computer systems, sending shares down over five percent.
JFS said it took all affected systems offline as a precautionary measure and was working with cyber security experts to recover systems, applications and data from its disaster recovery back-up.
“Work is ongoing to complete recovery as quickly as possible and minimize any impact on our businesses,” JFS said, adding it notified regulators and law enforcement agencies in the UK.
Cyber-attacks have been in focus after a virus spread from Ukraine wreaked havoc in 2017, crippling thousands of computers and disrupting ports from Mumbai to Los Angeles.
Global insurers covering cyberattacks face more claims, specially related to ransom-demanding hackers who cripple technology systems and stop after receiving substantial payment.