Almeida Law Group is investigating a data breach at Ladenburg Thalmann & Co. Inc. If you were affected, contact Almeida Law Group.
About Ladenburg Thalmann & Co. Inc.
Ladenburg Thalmann & Co. Inc. is a full-service investment banking and brokerage firm that has been a member of the New York Stock Exchange since 1879. It provides investment banking, equity research, institutional sales and trading, wealth management, and brokerage services principally for middle market and emerging growth companies and high net worth individuals. The firm is incorporated in Delaware and maintains its principal office at 640 5th Avenue, 4th Floor, New York, NY 10019. It is an indirect wholly-owned subsidiary of Osaic, Inc. (formerly Advisor Group Holdings, Inc.), following the 2020 merger of its parent company with Advisor Group.
What Happened?
Ladenburg Thalmann & Co. Inc. was listed in a Vermont Attorney General breach report summary dated September 24th, 2026. The report identifies the organization as a Financial Services entity and states that the following categories of information were involved: Social Security Numbers, Government ID Numbers, Financial Account Codes, and Credit and Debit Account Information. The Vermont AG filing does not specify the total number of individuals affected, the nature of the incident such as unauthorized access, phishing, or ransomware, or the specific dates on which the breach occurred or was first detected. No ransomware group claims related to this specific incident were identified in public sources.
Ladenburg Thalmann & Co. Inc. operates within the Osaic, Inc. corporate family, which has a documented history of cybersecurity incidents. In December 2021, a systems intrusion at third-party vendor R.R. Donnelley affected Osaic and Advisor Group affiliates, including Ladenburg Thalmann & Co., resulting in the exfiltration of personal information. In March 2024, FINRA fined sibling Osaic firms — Osaic Wealth and Securities America — for cybersecurity failures at branch offices, citing numerous email takeover incidents that exposed customers’ nonpublic personal information and a lack of multi-factor authentication prior to March 2023. No public class action litigation specifically connected to this September 2026 incident was found in available sources.
Key Facts at a Glance
- Company or Organization: Ladenburg Thalmann & Co. Inc.
- Industry: Financial Services — Investment Banking and Brokerage (SEC-registered broker-dealer, FINRA/NYSE member)
- Location: 640 5th Avenue, 4th Floor, New York, NY 10019
- Date of consumer notification: September 24th, 2026
- Prior breach: Yes — December 2021 R.R. Donnelley third-party vendor breach affecting Osaic/Advisor Group affiliates; FINRA cybersecurity fines against sibling Osaic firms in 2024
- Source: Vermont Attorney General breach report summary; Massachusetts AG — Osaic/RRD breach notice; InvestmentNews — Osaic FINRA cybersecurity fines
What Should You Do?
If you received a notice from Ladenburg Thalmann & Co. Inc., take advantage of any identity theft protection services the company is offering and enroll before the stated deadline. Because Social Security Numbers, Government ID Numbers, and financial account data were involved, you should place a fraud alert or credit freeze with all three major credit bureaus — Equifax, Experian, and TransUnion — and monitor your credit reports for unfamiliar accounts or inquiries. You can request free reports at AnnualCreditReport.com. Watch your bank and investment account statements closely for unauthorized transactions, and report any suspected identity theft or fraud to the Federal Trade Commission at IdentityTheft.gov.
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.
