# Main Street Advisors

> Main Street Advisors is an SEC-registered investment advisory firm in Santa Monica, CA, registered since 2019, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated March 27, 2026.

- CRD: 305170
- Filed as: MAIN STREET ADVISORS
- Legal name: MSA Advisors, LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Santa Monica, CA
- Filing period: October 2026
- Form ADV filing dated: March 27, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/305170
- AdvisorCensus page: https://advisorcensus.com/firm/main-street-advisors-santa-monica-ca-305170

## Quick answers

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

**Where is Main Street Advisors located?**
Main Street Advisors' principal office is in Santa Monica, CA, according to its Form ADV.

**Is Main Street Advisors registered with the SEC or a state?**
Main Street Advisors is an SEC-registered investment advisory firm, registered since 2019. Status as filed: Approved. CRD 305170.

**How much does Main Street Advisors manage?**
Main Street Advisors reports $9,647,018,829 in regulatory assets under management in its Form ADV filing dated March 27, 2026 (73% discretionary).

**How have Main Street Advisors' assets and staff changed since 2021?**
In the Form ADV data for Main Street Advisors: Regulatory assets under management: $6,082,889,363 in the October 2021 data and $9,647,018,829 in the October 2026 data, up 59%. Total employees: 23 in October 2021 and 34 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Main Street Advisors serve?**
By number of clients on Form ADV Item 5.D: high net worth individuals (68); pooled investment vehicles (other than investment companies and business development companies) (6).

**Does Main Street Advisors 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/305170

**Does Main Street Advisors state an account minimum?**
Its Form ADV Part 2A brochure dated March 27, 2026 says: "MSA generally requires clients to place at least $10 million under an advisory relationship; however, MSA maintains discretion to accept less than the minimum threshold."

**What changed in Main Street Advisors' recent Form ADV filings?**
In the April 2026 filing data: Regulatory assets under management went from $8,739,376,053 to $9,647,018,829 (+10%). Employees performing advisory functions went from 15 to 17.

## 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 27, 2026)

- Account minimum: $10,000,000 (the brochure says it may be waived or negotiated)

> MSA generally requires clients to place at least $10 million under an advisory relationship; however, MSA maintains discretion to accept less than the minimum threshold.

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

### Regulatory assets under management (Item 5.F)
- Total: $9,647,018,829
- Discretionary: $7,009,680,409
- Non-discretionary: $2,637,338,420

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | Not reported | $0 |
| High net worth individuals | 68 | $7,140,550,383 |
| Banking or thrift institutions | Not reported | $0 |
| Investment companies | Not reported | $0 |
| Business development companies | Not reported | $0 |
| Pooled investment vehicles (other than investment companies and business development companies) | 6 | $1,768,355,368 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | Not reported | $0 |
| Charitable organizations | Fewer than 5 | $47,579,929 |
| State or municipal government entities (including government pension plans) | Fewer than 5 | $690,533,149 |
| Other investment advisers | Not reported | $0 |
| Insurance companies | Not reported | $0 |
| Sovereign wealth funds and foreign official institutions | Not reported | $0 |
| Corporations or other businesses not listed above | Not reported | $0 |
| Other | Not reported | $0 |

### Advisory services (Item 5.G)
- Portfolio management for individuals and/or small businesses
- Portfolio management for pooled investment vehicles (other than investment companies)
- Portfolio management for businesses (other than small businesses) or institutional clients
- Selection of other advisers (including private fund managers)

### Firm details
- Registered since: 2019 (7 years)
- Employees: 34 total, 17 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: CA, TX
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- mainstreetadvisors.com
- LinkedIn @mainstreetadvisors

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $6,082,889,363 | 23 | September 8, 2021 |
| October 2022 | $8,567,909,499 | 25 | April 27, 2022 |
| October 2023 | $7,946,002,715 | 27 | July 12, 2023 |
| October 2024 | $8,117,604,543 | 26 | June 28, 2024 |
| October 2025 | $8,739,376,053 | 28 | April 15, 2025 |
| October 2026 | $9,647,018,829 | 34 | March 27, 2026 |

Regulatory assets under management: $6,082,889,363 in the October 2021 data and $9,647,018,829 in the October 2026 data, up 59%.
Total employees: 23 in October 2021 and 34 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Regulatory assets under management went from $8,739,376,053 to $9,647,018,829 (+10%).
- Employees performing advisory functions went from 15 to 17.

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Main Street Advisors (CRD 305170): Form ADV filing data as of October 2026.