Supervisory Control System (FINRA Rule 3120)

FINRA's supervision rule establishes the supervisory system. The supervisory-control rule adds another layer: it requires the firm to test whether that system is actually working. Think of it as the "supervision of supervision."


Designated Principal

  • Each firm must designate one or more principals who are specifically identified to FINRA
  • These designated principals are responsible for establishing, maintaining, and enforcing a system of supervisory control policies and procedures
  • This is a distinct role from the day-to-day supervisory principals under the general supervision rule

Exam Tip: Gotchas

The designated principal under the supervisory-control rule is a specific role identified to FINRA, not just any principal. The exam may test whether you know this is a distinct designation from routine supervisory principals.


Testing and Verification

The designated principal(s) must:

  • Test and verify that the firm's supervisory procedures are reasonably designed to achieve compliance
  • Where testing reveals gaps, create additional or amend existing supervisory procedures
  • This is an active, ongoing obligation, not a one-time review

Exam Tip: Gotchas

The supervision rule = establish the supervisory system; the supervisory-control rule = test whether it works. The exam loves this distinction. Having procedures on paper (compliant with the supervision rule) is not the same as verifying they are effective (the supervisory-control test).


Annual Report to Senior Management

The designated principal(s) must submit a report to the firm's senior management at least annually. The report must include:

  • A description of the firm's supervisory control system
  • A summary of test results and significant identified exceptions
  • Any additional or amended supervisory procedures created in response to the test results

Exam Tip: Gotchas

The annual report goes to the firm's senior management, not to FINRA directly. This is a common trap on the exam.


Enhanced Reporting for Large Firms

Firms with $200 million or more in gross revenue (per Financial and Operational Combined Uniform Single (FOCUS) report from the prior calendar year) must include additional content in the annual report:

Standard Report (All Firms)Additional Content ($200M+ Firms)
Description of supervisory control systemTabulation of customer complaints and internal investigations reported to FINRA
Summary of test results and exceptionsDiscussion of compliance efforts across six areas
Amended supervisory procedures

The six compliance areas for large firm reporting:

  1. Trading and market activities
  2. Investment banking
  3. Antifraud and sales practices
  4. Finance and operations
  5. Supervision
  6. Anti-money laundering

Exam Tip: Gotchas

The $200 million threshold is based on the prior calendar year FOCUS report, not the current year. Also, the supervisory-control rule tests the supervisory SYSTEM, not individual trades or accounts. A firm can be supervision-rule compliant (has written procedures) but still violate the supervisory-control rule if it never tests whether those procedures actually work.