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Broker Misconduct Investigation: Michael Rosenmeyer (Oppenheimer & Company)

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Updated on: September 3, 2025

National investment loss lawyers KlaymanToskes is investigating broker Michael Rosenmeyer (CRD #2352488) of Oppenheimer & Company, Inc.

According to FINRA BrokerCheck, broker Michael Rosenmeyer of Oppenheimer & Company, Inc. has 23 disclosures and is currently facing a customer complaint alleging $500,000 in damages. The complaint alleges negligence, unsuitability, and other violations of state and federal securities laws in connection with investments in municipal bonds beginning on 7/1/2021.

Investors that suffered losses with broker Michael Rosenmeyer are encouraged to contact attorney Lawrence L. Klayman, Esq., at 888-997-9956 or by email at investigations@klaymantoskes.com to discuss potential recovery options. We do not collect attorney’s fees unless we are able to obtain a financial recovery for you.

Oppenheimer & Company Broker Michael Rosenmeyer: 23 Disclosures

Michael Rosenmeyer, a financial advisor registered with Oppenheimer & Company, currently has 23 disclosures on his FINRA BrokerCheck report. The most recent complaint involved a customer alleging $500,000 in damages related to municipal bonds that violated various securities laws. 

Similarly, in March 2023, investors filed a complaint alleging unsuitability, negligence, misrepresentations, and securities law violations related to Capital Trust Agency Florida Senior Living Bonds; the case settled for $50,000. Further, on May 24, 2018, a trustee claimed Rosenmayer made an unsuitable investment, which was resolved when Oppenheimer repurchased the bond at issue from the customer.

Rosenmeyer is currently registered as a broker with Oppenheimer & Company in Los Angeles, CA. 

Signs Investors Should Look Out For About Their Brokerage Accounts

As an investor, there are a few signs that you should look out for if you believe you may have a claim against your financial advisor. These signs could potentially indicate misconduct, negligence, or investment fraud. Investors are encouraged to contact our firm immediately if you have experienced any of the following:

  • You have substantial losses in your investment accounts
  • You received a call, email, or other communication from your broker’s supervisor or manager regarding your portfolio
  • Your broker misrepresented investment opportunities, or failed to disclose details about investments
  • You notice unauthorized transactions in your investment accounts
  • Your broker is not returning your calls or emails
  • You filed a complaint with your brokerage firm that has not been resolved
  • You see a mistake on your statement, or receive a fraudulent statement

Some investors have close relationships with their brokers due to the time and trust built over the course of their investment relationship. However, it is crucial to remember that financial decisions should be based on careful analysis and due diligence rather than solely relying on personal relationships.

Engaging the services of an experienced securities attorney to evaluate your specific circumstances is strongly advised. At KlaymanToskes, our team of experienced securities attorneys has a deep understanding of this complex area of law, allowing us to provide invaluable insight and tailored guidance that directly addresses your individual needs.

If you suffered losses with broker Michael Rosenmeyer, or have concerns regarding your investment portfolio at Oppenheimer & Company, or with any other financial advisor or firm, contact KlaymanToskes at 888-997-9956 or fill out a short contact form for a free and confidential consultation.