A May ransomware attack on M.J. Brunner Inc. exposed data pertaining to clients of SEI Investments Co., among them money managers like Pacific Investment Management Co. (Pimco), Fortress Investment Group LLC and Centerbridge Partners.

SEI Investments said in a statement that the attack was not the result of any flaw in its network. Instead, the fault stemmed from a hack at vendor M.J. Brunner, which developed and maintains the investment company’s dashboard as well as its online enrollment portal, according to a Wall Street Journal report, citing sources who said user names, emails and some physical addresses and phone numbers were nicked from the provider.

“We take our clients’ security very seriously, and we are working with Brunner, the Federal Bureau of Investigation and our impacted clients to understand the extent to which SEI’s or our clients’ data has been exposed,” the spokesperson said.

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