Mariner Wealth Advisors: AssetMark Reports Voice Phishing Attack

Mariner Wealth Advisors Reports Data Breach Impacting Nearly 9,000 Individuals

Mariner Wealth Advisors, a U.S.-based financial services firm, recently disclosed a data breach affecting approximately 9,000 clients and employees. The incident, detected earlier this year, involved unauthorized access to sensitive personal and financial information, though the exact scope of exposed data remains under investigation.

While details on the breach’s origin are limited, cybersecurity experts suggest it may be linked to a broader trend of targeted attacks against financial institutions. Mariner has notified affected individuals and is working with regulators to assess the impact. The firm has also implemented additional security measures to prevent future incidents.

This breach follows a pattern of increasing cyber threats in the financial sector, underscoring the risks faced by wealth management firms handling confidential client data. No evidence of fraudulent activity has been reported at this time, but affected parties are advised to monitor their accounts for suspicious transactions. The full extent of the breach’s consequences is still being evaluated.

Source: https://www.thinkadvisor.com/2026/06/30/assetmark-reports-voice-phishing-attack/

Mariner cybersecurity rating report: https://www.rankiteo.com/company/access-mariner

"id": "ACC1782851760",
"linkid": "access-mariner",
"type": "Breach",
"date": "1/2020",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"

{'affected_entities': [{'customers_affected': '9000',
                        'industry': 'Wealth Management',
                        'location': 'U.S.',
                        'name': 'Mariner Wealth Advisors',
                        'type': 'Financial Services Firm'}],
 'customer_advisories': 'Affected parties advised to monitor their accounts '
                        'for suspicious transactions',
 'data_breach': {'number_of_records_exposed': '9000',
                 'sensitivity_of_data': 'High',
                 'type_of_data_compromised': ['Personal information',
                                              'Financial information']},
 'description': 'Mariner Wealth Advisors, a U.S.-based financial services '
                'firm, recently disclosed a data breach affecting '
                'approximately 9,000 clients and employees. The incident '
                'involved unauthorized access to sensitive personal and '
                'financial information, though the exact scope of exposed data '
                'remains under investigation.',
 'impact': {'data_compromised': 'Sensitive personal and financial information'},
 'investigation_status': 'Ongoing',
 'references': [{'source': 'Cyber Incident Description'}],
 'regulatory_compliance': {'regulatory_notifications': 'Working with '
                                                       'regulators to assess '
                                                       'the impact'},
 'response': {'communication_strategy': 'Notified affected individuals',
              'remediation_measures': 'Additional security measures '
                                      'implemented'},
 'title': 'Mariner Wealth Advisors Data Breach',
 'type': 'Data Breach'}