Almeida Law Group is investigating a data breach at AssetMark, Inc. The breach occurred on May 15th, 2026 and was discovered on May 15th, 2026. If you were affected, contact Almeida Law Group.
About AssetMark, Inc.
AssetMark, Inc. is a wealth management platform headquartered in Concord, California that provides custodial, recordkeeping, trust, and investment-related services to financial advisors and their clients. Founded in 1996, the company serves more than 10,000 financial advisors and over 300,000 investor households. It is a subsidiary of AssetMark Financial Holdings, Inc., which is itself a subsidiary of Huatai Securities Co., Ltd. Because AssetMark handles the financial and personal records of a large number of investor households, a breach of its systems can expose highly sensitive data across a broad population.
What Happened?
AssetMark, Inc. was listed in a Texas Attorney General data security breach report (record ID BR-0005113) published on June 18th, 2026. According to AssetMark’s own breach notification letter, on May 15th, 2026, an unauthorized user gained access to and downloaded files containing customer information after a sophisticated phishing attack compromised the login credentials of one AssetMark employee. The company identified suspicious activity tied to those credentials and, by May 18th, 2026, had determined which individuals’ personal information was contained in the breached files. AssetMark began notifying affected individuals by U.S. Mail on June 11th, 2026. The breach affected approximately 570,000 individuals in total. The compromised data included names, Social Security numbers, financial account information, and government ID numbers, with some notices also listing addresses, account numbers, and Tax ID numbers depending on the individual. AssetMark stated that no client assets were compromised and that login credentials, banking information, and core operating systems were not affected. Complimentary credit monitoring was offered to affected individuals.
This incident is separate from an earlier disclosure made by AssetMark Trust Company — an affiliated subsidiary — which reported a distinct breach to the Texas Attorney General on May 8th, 2026, covering a breach period of March 17th, 2026 to April 9th, 2026 and affecting approximately 9,158 individuals. As of the time of this writing, no class action lawsuit has been filed in connection with the May 15th, 2026 AssetMark, Inc. breach, though multiple law firms are actively investigating potential claims.
Key Facts at a Glance
- Company or Organization: AssetMark, Inc.
- Industry: Financial Services / Wealth Management
- Location: Concord, California 94520
- Incident type: Unauthorized access and download of customer files via phishing attack
- Date of breach: May 15th, 2026
- Date breach discovered: May 15th, 2026
- Date of consumer notification: June 11th, 2026
- Total persons affected: 570,000
- Identity theft protection offered: Yes — complimentary credit monitoring
- Prior breach: AssetMark Trust Company (affiliated subsidiary) reported a separate breach to the Texas AG on May 8th, 2026, affecting approximately 9,158 individuals
- Litigation status: No class action filed; multiple law firms investigating potential claims
- Source: Texas Attorney General data security breach report, BR-0005113 (https://oag.my.site.com/datasecuritybreachreport/apex/DataSecurityReportsPage#BR-0005113); AssetMark breach notification letter via Nebraska AG (https://www.nebraska.gov/ago/data-breach/documents/5c2e7b66-1909-4ed9-8b3c-c603b1b92bfc.pdf); ClassAction.org (https://www.classaction.org/data-breach-lawsuits/assetmark-june-2026)
What Should You Do?
If you received a notice from AssetMark, enroll in the complimentary credit monitoring it offered before any stated deadline. You should also consider placing a fraud alert or credit freeze with each of the three major credit bureaus — Equifax, Experian, and TransUnion — to help prevent new accounts from being opened in your name. Review your existing financial account statements closely for any unauthorized activity, and request your free credit reports at AnnualCreditReport.com to check for unfamiliar accounts or inquiries. If you believe your information is being misused, visit IdentityTheft.gov for step-by-step guidance on reporting and recovery.
Your Legal Rights
If your personal information was involved in this breach, you may have legal rights depending on the facts of the incident and the law in your state. Almeida Law Group represents consumers in data breach and privacy litigation and can help you evaluate whether you may have a claim. Contact us at (708) 529-5418 or through our contact page for a free case evaluation.
