Fee-only adviser · Lakeville, CT
Main Street Research LLC
Main Street Research LLC is a fee-only investment adviser registered with the U.S. Securities and Exchange Commission, with its main office in Lakeville, Connecticut. On its latest Form ADV, filed April 27, 2026, it reports $2.7B in regulatory assets under management, 1,018 individual clients and 16 employees who give investment advice. It reports no commission compensation, is not registered as a broker-dealer and does not act as an insurance agent.
Key facts from Form ADV
| Registration | SEC-registered |
|---|---|
| Firm CRD number | 114629 · SEC file 801-57739 |
| Office | 342 Main Street Lakeville, CT 06039 |
| Phone | (860) 435-2350 |
| Website | www.ms-research.com |
| Regulatory assets under management | $2.7B |
| Individual clients | 203 non-high-net-worth, 815 high-net-worth |
| Financial planning clients | More than 500 |
| How it charges | Percentage of assets |
| Services | Financial planning, Portfolio management, Educational seminars |
| Employees | 24 |
| Disciplinary disclosures | None reported |
| Latest Form ADV filing | April 27, 2026 |
Source: the firm’s Form ADV Part 1A as published by the SEC’s Investment Adviser Public Disclosure database, data as of November 6, 2026. Figures are self-reported by the firm.
What this means for you
- It charges only as a percentage of the assets it manages. Ask about the fee schedule and any account minimum, which Form ADV Part 1 does not record.
- Most of its individual clients are high-net-worth, which on Form ADV means they meet the SEC’s qualified-client or qualified-purchaser test: broadly, more than $1 million managed by the adviser or a net worth above $2 million, with the thresholds indexed for inflation.
- It provides financial planning services, not only portfolio management.
- It reports no disciplinary history on Form ADV.
Before you hire any adviser
Read the firm’s Form ADV Part 2 brochure on its SEC record: it sets out fees, minimums, conflicts of interest and who will manage your money. Ask whether the firm acts as a fiduciary for all of your accounts, how it is paid in total, and who holds your assets. Our guide to choosing a financial adviser lists the questions to ask.
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