On August 3, 2026, Deer Management Co. LLC, doing business as Bessemer Venture Partners, was targeted in a voice phishing incident. This resulted in temporary unauthorized access to certain employee accounts. The company acted promptly to contain the incident, notified law enforcement, and engaged a leading cyber forensic firm to investigate. The external forensic expert confirmed the incident was fully contained by August 4, 2026, with no known unauthorized activity since then. The company sent notification letters to affected individuals on September 30, 2026.
The breach exposed names and Social Security numbers. While the Massachusetts Attorney General filing reports 82 affected Massachusetts residents, the nationwide total of affected individuals and a complete list of data categories remain unclear. The company's public materials do not itemize all affected data elements.
Details of this incident, including the full scope of affected individuals and data types, may continue to emerge as investigations or notifications progress. Further information will be incorporated as it becomes publicly available.