Broker-Dealer vs. Investment Adviser Basics (Missouri)
A plain-English guide to the differences in registration, standards of conduct, and roles between broker-dealers and investment advisers in Missouri. Educational, not legal advice.
Educational guide · Last reviewed June 16, 2026
Understanding how financial professionals are regulated and structured under Missouri law helps protect your assets and keep your advisory relationship aligned with your goals. This guide covers three essentials: the formal legal definitions, how the standards of conduct differ, and how to verify licensing and disciplinary history before you partner with anyone.
There is no single always-best relationship model. The right choice depends on whether you need transactional trade execution or ongoing, comprehensive portfolio management and advice.
Roles and terminology
The industry uses many overlapping titles. Missouri law distinguishes them by the core service provided.
Broker-dealer (BD)
A person or firm engaged in the business of buying or selling securities for the accounts of others (broker) or for its own account (dealer). Broker-dealers are transaction-focused facilitators, typically compensated through commissions, markups, or sales loads per transaction.
Investment adviser (IA)
A person or firm that, for compensation, is in the business of advising others about the value of securities or the advisability of investing in, purchasing, or selling securities. Advisers are typically compensated through flat fees, hourly rates, or a percentage of assets under management (AUM).
Standards of conduct, and why they matter
The legal standard of care determines how conflicts of interest are managed and how recommendations must be structured.
The fiduciary standard (advisers)
Investment advisers are bound by a strict fiduciary duty: they must put your interests ahead of their own at all times, disclose all material conflicts of interest, and provide continuous loyalty and care.
“Are you acting as a fiduciary for my entire portfolio, at all times?”
Suitability and best-interest standards (brokers)
Broker-dealers are governed by Regulation Best Interest (Reg BI) and suitability rules. They must recommend products that fit your financial profile, but they are not required to provide continuous advice and may be subject to different conflict-of-interest rules.
“How are you compensated for recommending this specific investment?”
Side-by-side comparison
| Feature | Broker-dealer | Investment adviser |
|---|---|---|
| Standard of care | Suitability / Reg BI | Fiduciary duty |
| Typical compensation | Commissions and markups, per trade | Flat fee, hourly, or a percentage of AUM |
| Relationship | Transaction-focused execution | Ongoing advice and portfolio management |
| Primary disclosure | Form CRS; record on FINRA BrokerCheck | Form ADV Part 2A brochure and Form CRS |
Registration and public disclosures
Both broker-dealers and investment advisers must register and file public disclosures. Use these to verify their standing.
- Securities Division verification. Confirm active registration directly with the Missouri Securities Division, for both the firm and the individual representative.
- Central Registration Depository (CRD). Look up CRD numbers for a comprehensive employment and regulatory history, and review past customer complaints, arbitrations, and regulatory actions.
Problem Code 16 (Reg BI) covers allegations that recommendations to retail customers were not in their best interest, across four obligations: care (reasonable diligence about risks, rewards, and costs), disclosure (material facts before or at the recommendation), conflict of interest (material conflicts addressed), and compliance (written policies and procedures for Reg BI). Problem Code 17 (Form CRS) covers allegations about the firm’s Form CRS or its delivery to retail investors.
Missouri timing nuance. For allegations after June 30, 2020, firms should consider Problem Code 16 even if the complaint uses older suitability terminology.
What to verify before hiring
- Request and read the firm’s Form ADV Part 2A brochure and Part 3 (Form CRS).
- Confirm whether the representative is registered in Missouri as an IA, a BD, or both.
- Ask for a written explanation of all fees, commissions, and administrative costs.
- Verify any history of regulatory or disciplinary actions.
- Understand how often you will receive account statements and portfolio reviews.
The Missouri-specific angle
State vs. federal regulation. Firms with assets under management below $100 million are typically registered directly with the Missouri Securities Division, while larger firms register federally with the SEC.
Where verification happens. You can contact the Missouri Securities Division in Jefferson City to verify registration status, check for local enforcement actions, or file a formal complaint about investment services.
If you have a dispute
If you suspect misconduct or have a dispute with a financial professional, structured action early matters.
- Document what you can. Keep detailed records of all communications, including emails, letters, and notes from calls or meetings.
- Preserve evidence. Retain all monthly and quarterly account statements, and save copies of signed agreements and disclosure forms.
Frequently asked questions
No. Brokers are generally paid to execute transactions and are overseen by FINRA and the SEC. Investment advisers provide advice under a fiduciary standard and register with the SEC or the state. Some professionals are both.
No. A disclosure on BrokerCheck reflects a reported event, not a finding of wrongdoing. Read the details and context before drawing conclusions.
They disclose services, fees, conflicts of interest, and disciplinary history, which is exactly what you need to compare financial professionals before hiring.
Yes. Many are dually registered, which can change the standard of conduct that applies to a particular recommendation.
Yes. The Missouri Securities Division offers investor resources, registration verification, and a complaint process under the state Securities Act.
Primary sources and further reading: FINRA BrokerCheck, the SEC’s adviser search, and the Missouri Securities Division.
Securities-adjacent questions, handled plainly.
Compliance reviews, registration questions, and FINRA-adjacent matters, scoped up front with a flat fee where it fits.