Data / Investment advisers / Connecticut / Main Street Research LLC
Main Street Research LLC, Lakeville, CT: $2.7 billion AUM, SEC registered investment adviser
Updated November 7, 2026. Source: the SEC's Form ADV data files for investment advisers.
Main Street Research LLC is an SEC registered investment adviser with its main office in Lakeville, Connecticut and reports $2.7 billion in regulatory assets under management in its Form ADV filed April 27, 2026. Its clients include high net worth individuals, individuals and charitable organizations. It is paid through a percentage of assets under management and performance based fees.
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- Registration
- SEC registered investment adviser
- CRD number
- 114629
- SEC file number
- 801-57739
- SEC status
- Approved, effective November 14, 2000
- Main office
- 342 Main Street, Lakeville, CT 06039
- Phone
- (860) 435-2350
- Regulatory AUM
- $2,681,886,634 in the Form ADV filed April 27, 2026
- Discretionary AUM
- $2,681,886,634
- Accounts
- 3,017
- Employees
- 24, of which 16 give investment advice
- Form of organization
- Limited Liability Company
- Paid through
- a percentage of assets under management, performance based fees
- Other offices
- 4
- Form ADV Item 11 disclosures
- None reported
- Latest Form ADV filing
- April 27, 2026
- SEC record
- Investment Adviser Public Disclosure
Clients
Client types the adviser reports in Form ADV item 5.D, with the AUM it attributes to each.
| Client type | Clients | AUM |
|---|---|---|
| High net worth individuals | 815 | $2.55 billion |
| Individuals (other than high net worth individuals) | 203 | $67.9 million |
| Charitable organizations | 5 | $43.9 million |
| Pension and profit sharing plans | 8 | $16.9 million |
AUM in the SEC's monthly files
Each change in the AUM the adviser reported across the monthly SEC files held here, with the first file that shows the new value.
| First in the file of | AUM | Form ADV filed |
|---|---|---|
| April 1, 2026 | $2.68 billion | March 31, 2026 |
| December 1, 2025 | $2.38 billion | March 25, 2025 |
Other advisers in Connecticut
| Adviser | City | AUM | Private funds | Source |
|---|---|---|---|---|
| Ardmore Road Asset Management LP | Westport | $2.83 billion | 1 | adviserinfo.sec.gov |
| Johnson Brunetti | Wethersfield | $2.78 billion | Not listed | adviserinfo.sec.gov |
| GHK Capital Partners LP | Greenwich | $2.76 billion | 10 | adviserinfo.sec.gov |
| Mangrove Partners | Greenwich | $2.71 billion | 1 | adviserinfo.sec.gov |
| Precision Capital Advisors, LLC | Greenwich | $2.69 billion | 34 | adviserinfo.sec.gov |
| Steeprock Capital | Greenwich | $2.63 billion | Not listed | adviserinfo.sec.gov |
| Basso Capital Management, L.P. | Stamford | $2.56 billion | 1 | adviserinfo.sec.gov |
| Discerene Group LP | Stamford | $2.53 billion | 10 | adviserinfo.sec.gov |
Also on SpecStream
- Investment advisers in Connecticut
- Advisers with $1 billion to $10 billion in AUM
- Advisers serving high net worth individuals
- Advisers serving individuals
- Main Street Research LLC on the SEC's adviser search
Public data published by the US Securities and Exchange Commission (US government work). Advisers report these values themselves in Form ADV, and neither the SEC nor the states approve or guarantee them. AUM is regulatory assets under management as the adviser reported it in Form ADV item 5.F, which can differ from the AUM a firm quotes elsewhere. Exempt reporting advisers do not report AUM. Office address, phone and website are the adviser's main office as filed; a firm that files its main office as a private residence shows no street address or phone. An Item 11 disclosure is a reported event, not a finding about the firm today. Details for each firm are on the SEC's Investment Adviser Public Disclosure site. This page uses SEC data and is not endorsed or certified by the SEC. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.