What Is the Series 66?

The Series 66, formally known as the Uniform Combined State Law Examination, is a professional licensing exam administered by the Financial Industry Regulatory Authority (FINRA) on behalf of the North American Securities Administrators Association (NASAA). It is designed to qualify individuals to act as both securities agents and investment adviser representatives (IARs). The Series 66 is commonly taken in conjunction with the Series 7 exam, which covers broader topics in securities sales and trading.

While FINRA administers the exam, the Series 66 is not a FINRA qualification in itself. It was developed by NASAA to streamline the licensing process for individuals working in investment advisory and broker-dealer roles. Together, Series 7 and Series 66 fulfill the registration requirements in most U.S. states for professionals who provide both investment advice and execute securities transactions.

Purpose and Scope

The primary function of the Series 66 exam is to test a candidate’s understanding of investment laws, ethical practices, and economic principles relevant to the duties of an investment adviser representative. It serves as a requirement for those seeking registration with a state securities regulator in a dual capacity — both as a representative of a broker-dealer and as an IAR.

Unlike the Series 65, which qualifies individuals solely as investment adviser representatives without a broker-dealer affiliation, the Series 66 is intended for those who have passed or will pass the Series 7 and wish to register as IARs. Therefore, Series 66 does not test general securities knowledge, as that is assumed to be covered under Series 7. Instead, it focuses on topics such as investment adviser regulation, fiduciary responsibility, conflicts of interest, and ethical practices.

Exam Structure

The Series 66 exam consists of 100 scored multiple-choice questions, along with 10 unscored pretest questions that are randomly distributed. Test-takers have 150 minutes (2.5 hours) to complete the exam. A passing score is 73%.

The content is divided into four main sections:

1. Economic Factors and Business Information
2. Investment Vehicle Characteristics
3. Client Investment Recommendations and Strategies
4. Laws, Regulations, and Guidelines, including Prohibition on Unethical Business Practices

The fourth section is the most heavily weighted, reflecting the exam's emphasis on regulatory and ethical standards. Topics include the Uniform Securities Act (USA), SEC regulations, state vs. federal authority, recordkeeping, client communication requirements, and disciplinary actions.

Prerequisites and Registration

Candidates must be sponsored by a firm or register themselves through FINRA’s Central Registration Depository (CRD) system or Web CRD. There are no formal education or professional experience prerequisites, but it is standard for individuals to have passed the Series 7 exam or plan to do so before applying for state registration with the Series 66.

The fee for the Series 66 exam is determined by NASAA and collected through FINRA. As of this writing, the exam fee is $187, though that amount may change over time.

Once the exam is passed, the individual still needs to file the proper state registration forms, typically through the Investment Adviser Registration Depository (IARD), and be approved by the relevant state regulator to legally operate as an IAR.

Use and Relevance in the Industry

Passing the Series 66 exam is often required for professionals who work at Registered Investment Adviser (RIA) firms or dual-registered broker-dealers that offer both advisory and transactional services. Many financial advisors pursue the Series 66 to meet state-level requirements and expand their ability to provide fee-based investment advice while still conducting commission-based trades through a broker-dealer.

The Series 66 has become increasingly relevant in a regulatory environment that places greater emphasis on fiduciary standards and state-level oversight. It is particularly useful for advisors transitioning from brokerage roles to hybrid or fee-only advisory practices. By obtaining the Series 66, advisors demonstrate their understanding of client-focused regulatory standards, which is crucial in maintaining compliance in advisory relationships.

Differences from Related Licenses

While the Series 66 is often compared to the Series 65 exam, they serve different regulatory pathways. The Series 65 is suitable for individuals who are not affiliated with a broker-dealer and only need investment adviser representative qualifications. In contrast, the Series 66 must be paired with the Series 7 and is intended for dual roles.

Another key difference is that Series 65 includes some general securities knowledge, while Series 66 assumes that knowledge is already covered by Series 7. Therefore, individuals without a Series 7 typically choose Series 65 instead of Series 66.

Regulatory Oversight and Continuing Requirements

The Series 66 license is valid as long as the individual remains registered and in good standing with the applicable state securities authorities. States may have additional requirements, including annual filings, fees, continuing education, and background checks.

Although the Series 66 does not have a continuing education requirement through FINRA (since it is not a FINRA license), individual states and employers may impose ongoing compliance or training standards.

The Bottom Line

The Series 66 exam plays a vital role in the U.S. financial regulatory framework by enabling professionals to act in dual capacities — as securities agents and investment adviser representatives. It is essential for advisors who want to deliver both transaction-based and fee-based services within a compliant structure. When combined with the Series 7, it satisfies the licensing requirements in most states for those working in hybrid or advisory roles. Understanding its scope, structure, and regulatory function is key for anyone seeking to build a career in financial advising.