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Broker Misconduct Investigation: Matthew McDonald (Sigma Financial Corp)

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Updated on: February 22, 2026

National investment loss lawyers KlaymanToskes is investigating broker Matthew McDonald (CRD# 2837629) of Sigma Financial Corporation and Sigma Planning Corporation

According to FINRA BrokerCheck, broker Matthew McDonald of Sigma Financial Corp. and Sigma Planning Corp., is facing a customer complaint alleging $230,000 in damages due to misrepresentation and negligence. The complaint further alleges the BD supervision of the customer’s account was inadequate.

Investors that suffered losses with broker Matthew McDonald 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.

Financial Advisor Matthew McDonald Faces Customer Complaint

According to FINRA BrokerCheck, financial advisor Matthew McDonald is currently involved in a customer complaint seeking $230,000 in alleged damages. The complaint further alleges misrepresentation and negligence in connection with investments purchased in 2012 through 2016. The customer further alleges the BD supervision of the investor’s account was inadequate. McDonald is registered with Sigma Financial Corporation and Sigma Planning Corporation in Walled Lake, MI.

Investment Losses with Broker Matthew McDonald?

Investment Losses with Broker Matthew McDonald?

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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 Matthew McDonald, or have concerns regarding your investment portfolio at Sigma Financial Corporation, Sigma Planning Corporation, or with any other financial advisor or firm, contact KlaymanToskes at 888-997-9956 or for a free and confidential consultation.