Bessemer Venture Partners Investigated Following 2026 Voice Phishing Breach
Shamis & Gentile P.A., a class action law firm specializing in data breach cases, is investigating a security incident involving Deer Management Co. LLC (dba Bessemer Venture Partners), an SEC-registered investment adviser based in Larchmont, New York.
On August 3, 2026, Bessemer Venture Partners experienced a voice phishing attack, leading to temporary unauthorized access to certain employee accounts. The firm responded by containing the breach, notifying law enforcement, and engaging a cyber forensic firm. The investigation confirmed the incident was fully contained by August 4, 2026, with no further unauthorized activity detected.
The breach exposed sensitive personally identifiable information (PII), including names and Social Security numbers of affected individuals. Shamis & Gentile P.A. is assessing potential compensation for those impacted. Bessemer Venture Partners manages assets for clients in the venture capital and private equity sectors.
Source: https://www.claimdepot.com/investigations/deer-management-co-data-breach-2026
Deer Management Co. LLC TPRM report: https://www.rankiteo.com/company/deerfield-management
"id": "dee1790894240",
"linkid": "deerfield-management",
"type": "Breach",
"date": "10/2026",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'industry': 'Venture Capital and Private Equity',
'location': 'Larchmont, New York',
'name': 'Deer Management Co. LLC (dba Bessemer Venture '
'Partners)',
'type': 'Investment Adviser'}],
'attack_vector': 'Voice Phishing',
'data_breach': {'personally_identifiable_information': ['Names',
'Social Security '
'numbers'],
'sensitivity_of_data': 'High',
'type_of_data_compromised': 'Personally identifiable '
'information (PII)'},
'date_detected': '2026-08-03',
'date_resolved': '2026-08-04',
'description': 'Bessemer Venture Partners experienced a voice phishing attack '
'leading to temporary unauthorized access to certain employee '
'accounts. The breach exposed sensitive personally '
'identifiable information (PII), including names and Social '
'Security numbers of affected individuals.',
'impact': {'data_compromised': 'Personally identifiable information (PII), '
'including names and Social Security numbers',
'identity_theft_risk': 'High',
'systems_affected': 'Employee accounts'},
'investigation_status': 'Ongoing (Class action investigation)',
'references': [{'source': 'Shamis & Gentile P.A.'}],
'regulatory_compliance': {'legal_actions': 'Class action investigation by '
'Shamis & Gentile P.A.'},
'response': {'containment_measures': 'Contained the breach',
'incident_response_plan_activated': 'Yes',
'law_enforcement_notified': 'Yes',
'third_party_assistance': 'Cyber forensic firm'},
'title': 'Bessemer Venture Partners Voice Phishing Breach',
'type': 'Voice Phishing'}