Kroll is a financial and risk advisory firm established in 1932 and based in New York City. In 2018, Kroll was acquired by Duff & Phelps. In 2021, Duff & Phelps decided to rebrand itself as Kroll, a process it completed in 2022. From Wikipedia
The breach, exploiting Cleo Communications' zero-day vulnerabilities, exposed sensitive customer information, with no evidence of misuse reported so far.