# Main Street Research LLC

> Main Street Research LLC is an SEC-registered investment advisory firm in Lakeville, CT, registered since 2000, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated April 27, 2026.

- CRD: 114629
- Filed as: MAIN STREET RESEARCH LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Lakeville, CT
- Filing period: October 2026
- Form ADV filing dated: April 27, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/114629
- AdvisorCensus page: https://advisorcensus.com/firm/main-street-research-llc-lakeville-ct-114629

## Quick answers

**How is Main Street Research LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Main Street Research LLC reports these compensation arrangements: a percentage of assets under its management; performance-based fees.

**Where is Main Street Research LLC located?**
Main Street Research LLC's principal office is in Lakeville, CT, according to its Form ADV; the May 2026 filing also lists 4 other offices (Schedule D, Section 1.F).

**Is Main Street Research LLC registered with the SEC or a state?**
Main Street Research LLC is an SEC-registered investment advisory firm, registered since 2000. Status as filed: Approved. CRD 114629.

**How much does Main Street Research LLC manage?**
Main Street Research LLC reports $2,681,886,634 in regulatory assets under management in its Form ADV filing dated April 27, 2026 (100% discretionary).

**How have Main Street Research LLC's assets and staff changed since 2021?**
In the Form ADV data for Main Street Research LLC: Regulatory assets under management: $1,389,974,082 in the October 2021 data and $2,681,886,634 in the October 2026 data, up 93%. Total employees: 13 in October 2021 and 24 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Main Street Research LLC serve?**
By number of clients on Form ADV Item 5.D: high net worth individuals (815); individuals (other than high net worth individuals) (203); pension and profit sharing plans (but not the plan participants or government pension plans) (8).

**Which custodians does Main Street Research LLC use?**
Main Street Research LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Charles Schwab & Co., Inc. as a custodian holding 10% or more of its separately managed account assets.

**Does Main Street Research LLC report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/114629

**What changed in Main Street Research LLC's recent Form ADV filings?**
In the April 2026 filing data: Regulatory assets under management went from $2,384,657,948 to $2,681,886,634 (+12%). Updated its list of owners and control persons (Schedule A).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Performance-based fees

### Fees and minimums (Form ADV Part 2A brochure dated March 31, 2026)

- Minimum annual fee: None

> Further, there are no minimum fee requirements.

As stated in the firm's brochure. Fees can differ by service and may be negotiable.

### Custodians (Schedule D, Section 5.K(3))
- Charles Schwab & Co., Inc.

Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian.

### Regulatory assets under management (Item 5.F)
- Total: $2,681,886,634
- Discretionary: $2,681,886,634
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 203 | $67,948,537 |
| High net worth individuals | 815 | $2,553,138,019 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 8 | $16,948,381 |
| Charitable organizations | 5 | $43,851,697 |

### Advisory services (Item 5.G)
- Financial planning services
- Portfolio management for individuals and/or small businesses
- Portfolio management for businesses (other than small businesses) or institutional clients
- Educational seminars/workshops
- Other

### Firm details
- Registered since: 2000 (25 years)
- Employees: 24 total, 16 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, HI, IA, IL, IN, KY, LA, MA, MD, ME, MI, MN, MO, MT, NC, ND, NH, NJ, NM, NV, NY, OH, OR, PA, RI, SC, TN, TX, UT, VA, VT, WA, WV
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Other offices (Schedule D, Section 1.F), as of the May 2026 filing
- Greenwich, CT
- Lakeville, CT
- New York, NY
- Sausalito, CA

### Websites listed on Form ADV (Item 1.I)
- ms-research.com
- Facebook @MainStreetResearch
- Instagram @mainstreetresearch
- LinkedIn @main-street-research
- X @MAINSTREETRIA
- YouTube @UCAhWEuanmTs_6WEQgbPDq0g

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $1,389,974,082 | 13 | September 28, 2021 |
| October 2022 | $1,963,324,024 | 22 | June 8, 2022 |
| October 2023 | $1,674,891,277 | 23 | April 25, 2023 |
| October 2024 | $1,816,608,726 | 21 | August 21, 2024 |
| October 2025 | $2,384,657,948 | 24 | March 25, 2025 |
| October 2026 | $2,681,886,634 | 24 | April 27, 2026 |

Regulatory assets under management: $1,389,974,082 in the October 2021 data and $2,681,886,634 in the October 2026 data, up 93%.
Total employees: 13 in October 2021 and 24 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Regulatory assets under management went from $2,384,657,948 to $2,681,886,634 (+12%).
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Main Street Research LLC (CRD 114629): Form ADV filing data as of October 2026.