A ransomware attack against a vendor of SEI Investments detected in May exposed the personal information of investors in roughly 100 of the fund administrator’s clients, according to people familiar with the matter. The attack infiltrated the corporate systems of M.J. Brunner, a Pittsburgh- and Atlanta-based service provider that developed and supports SEI’s investment dashboard and online enrollment portal, the people said.
Angelo Gordon & Co., Graham Capital Management, Fortress Investment Group, Centerbridge Partners and PIMCO were among the funds whose investors were impacted by the attack, the people said. Some of SEI’s clients notified their investors of the breach earlier this month after SEI told them about the attack.
The attack is the latest in a string of ransomware incidents that have affected the financial services sector through its suppliers. Regulators are growing increasingly concerned about these incidents. On July 10, the Securities and Exchange Commission published a warning that it had seen sophisticated cyberattacks targeting companies it regulates and their third-party suppliers.