# Main Street Investment Advisors, LLC

> Main Street Investment Advisors, LLC is an SEC-registered investment advisory firm in Northbrook, IL, registered since 2018, reporting $100 million to $500 million in regulatory assets under management in its Form ADV filing dated January 20, 2026.

- CRD: 146036
- Filed as: MAIN STREET INVESTMENT ADVISORS, LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Northbrook, IL
- Filing period: October 2026
- Form ADV filing dated: January 20, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/146036
- AdvisorCensus page: https://advisorcensus.com/firm/main-street-investment-advisors-llc-northbrook-il-146036

## Quick answers

**How is Main Street Investment Advisors, LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Main Street Investment Advisors, LLC reports these compensation arrangements: a percentage of assets under its management; fixed fees (other than subscription fees).

**Where is Main Street Investment Advisors, LLC located?**
Main Street Investment Advisors, LLC's principal office is in Northbrook, IL, according to its Form ADV.

**Is Main Street Investment Advisors, LLC registered with the SEC or a state?**
Main Street Investment Advisors, LLC is an SEC-registered investment advisory firm, registered since 2018. Status as filed: Approved. CRD 146036.

**How much does Main Street Investment Advisors, LLC manage?**
Main Street Investment Advisors, LLC reports $250,312,643 in regulatory assets under management in its Form ADV filing dated January 20, 2026 (100% discretionary).

**How have Main Street Investment Advisors, LLC's assets and staff changed since 2021?**
In the Form ADV data for Main Street Investment Advisors, LLC: Regulatory assets under management: $160,000,000 in the October 2021 data and $250,312,643 in the October 2026 data, up 56%. Total employees: 3 in October 2021 and 3 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Main Street Investment Advisors, LLC serve?**
By number of clients on Form ADV Item 5.D: high net worth individuals (128); individuals (other than high net worth individuals) (14); charitable organizations (2).

**Which custodians does Main Street Investment Advisors, LLC use?**
Main Street Investment Advisors, LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Fidelity Brokerage Services LLC as a custodian holding 10% or more of its separately managed account assets.

**Does Main Street Investment Advisors, 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/146036

**Does Main Street Investment Advisors, LLC state an account minimum?**
Its Form ADV Part 2A brochure dated January 20, 2026 says: "We have a minimum asset amount for opening an account of $250,000." "In the past we opened accounts for less than the minimum if such accounts have the potential to grow quickly to the minimum level when aggregated, exceed the minimum asset requirement or there is a relationship to a current client that matches or exceeds the minimum."

**What changed in Main Street Investment Advisors, LLC's recent Form ADV filings?**
In the February 2026 filing data: Regulatory assets under management went from $214,653,300 to $250,312,643 (+17%). 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
- Fixed fees (other than subscription fees)

### Fees and minimums (Form ADV Part 2A brochure dated January 20, 2026)

- Account minimum: $250,000

> We have a minimum asset amount for opening an account of $250,000.

> In the past we opened accounts for less than the minimum if such accounts have the potential to grow quickly to the minimum level when aggregated, exceed the minimum asset requirement or there is a relationship to a current client that matches or exceeds the minimum.

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

### Custodians (Schedule D, Section 5.K(3))
- Fidelity Brokerage Services LLC

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: $250,312,643
- Discretionary: $250,312,643
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 14 | $3,280,000 |
| High net worth individuals | 128 | $243,295,643 |
| Charitable organizations | 2 | $3,737,000 |

### Advisory services (Item 5.G)
- Financial planning services
- Portfolio management for individuals and/or small businesses
- Selection of other advisers (including private fund managers)

### Firm details
- Registered since: 2018 (8 years)
- Employees: 3 total, 3 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: CA, CT, FL, IL, NC, RI
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- [mainstinvest.com](https://mainstinvest.com)

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $160,000,000 | 3 | March 29, 2021 |
| October 2022 | $180,000,000 | 3 | March 31, 2022 |
| October 2023 | $160,000,000 | 3 | March 24, 2023 |
| October 2024 | $175,000,000 | 3 | July 1, 2024 |
| October 2025 | $214,653,300 | 3 | February 12, 2025 |
| October 2026 | $250,312,643 | 3 | January 20, 2026 |

Regulatory assets under management: $160,000,000 in the October 2021 data and $250,312,643 in the October 2026 data, up 56%.
Total employees: 3 in October 2021 and 3 in October 2026.

## Changes in the filing (last 12 months)

### February 2026
- Regulatory assets under management went from $214,653,300 to $250,312,643 (+17%).
- 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 Investment Advisors, LLC (CRD 146036): Form ADV filing data as of October 2026.