SEC-registered independent wealth management RIA
Main Street Advisors
As of its Form ADV filed March 27, 2026, Main Street Advisors, an SEC-registered independent wealth management RIA in Santa Monica, California, reported $9.6 billion in regulatory assets under management across 125 accounts, ranking #22 among independent RIAs in California by assets.
Registration
- Main office
- Santa Monica, CA
- Registration
- SEC-registered, Approved
- CRD number
- 305170
- SEC file number
- 801-117239
- Registered since
- August 22, 2019
- Latest Form ADV filing
- March 27, 2026
- Legal name
- MSA ADVISORS, LLC
- Organized as
- Limited Liability Company
- Fiscal year ends
- December
- Other offices
- 0
Key figures
- Regulatory assets under management
- $9.6 billion
- Discretionary
- $7.0 billion (72.7%)
- Non-discretionary
- $2.6 billion
- Accounts
- 125 (52 discretionary)
- Clients
- 74, approximate as reported
- Employees
- 34
- Advisory staff
- 17 performing investment advisory functions
- Average account
- $77.2 million
- Asset growth, 1 year
- 10.4% (from $8.7 billion a year earlier)
- Asset growth, 3-year annual rate
- 6.7% (from $7.9 billion three years earlier)
- Asset growth, 5-year annual rate
- 9.7% (from $6.1 billion five years earlier)
- Client growth, 1 year
- 1.4% (from 73)
Independent wealth management RIA: individual and high net worth clients hold at least half of its regulatory assets, it offers financial planning or portfolio management for individuals, and it is not a broker-dealer, a bank or part of one by the directory's rules. How firms are classed.
Growth rates come from the SEC's yearly snapshots and are left blank when the years are not comparable.
Rankings
Among independent wealth management RIAs.
| Ranking | Nationally | In California | Value |
|---|---|---|---|
| Largest independent RIAs by assets under management | #111 | #22 | $9.6 billion |
| Fastest-growing independent RIAs over one year | #5,003 | #638 | 10.4%from $8.7 billion |
| Fastest-growing independent RIAs over three years | #4,773 | #636 | 6.7%from $7.9 billion |
| Fastest-growing independent RIAs over five years | #2,587 | #334 | 9.7%from $6.1 billion |
| Independent RIAs with the biggest asset gains over one year | #230 | #37 | $907.6 million |
| Independent RIAs with the most clients | #10,233 | #1,256 | 74 |
| Independent RIAs with the most accounts | #10,410 | #1,283 | 125 |
| Independent RIAs with the most advisory staff | #568 | #64 | 17 |
| Independent RIAs with the most high net worth clients | #4,455 | #572 | 68 |
Assets over time
Data table
| As of | RAUM |
|---|---|
| October 1, 2019 | $4.8 billion |
| October 1, 2020 | $5.2 billion |
| October 4, 2021 | $6.1 billion |
| October 3, 2022 | $8.6 billion |
| October 5, 2023 | $7.9 billion |
| October 1, 2024 | $8.1 billion |
| September 2, 2025 | $8.7 billion |
| October 2, 2026 | $9.6 billion |
Clients and services
Client mix
| Measure | Bar | RAUM |
|---|---|---|
| High net worth individuals 68 clients | $7.1 billion | |
| Pooled investment vehicles 6 clients | $1.8 billion | |
| State or municipal government entities fewer than 5 clients | $690.5 million | |
| Charitable organizations fewer than 5 clients | $47.6 million |
How the firm is paid
- A percentage of assets under management
- Performance-based fees
Advisory services
- Portfolio management for individuals or small businesses
- Portfolio management for pooled investment vehicles
- Portfolio management for businesses or institutional clients
- Selection of other advisers
Financial planning clients (Item 5.H): 0.
Wrap fee program sponsor or portfolio manager: no.
Other business, affiliations and custody
Other business activities (Item 6.A)
- Commodity pool operator or commodity trading advisor
Financial industry affiliations (Item 7.A)
- Broker-dealer
- Commodity pool operator or commodity trading advisor
- Sponsor, general partner or managing member of pooled investment vehicles
Advises 6 private funds (Item 7.B).
Custody (Item 9)
The firm reported custody of client cash or securities, $6.1 billion in total.
Investment adviser representatives
- IARs registered with the firm
- 0
- Also registered through a broker-dealer
- 0
- Employees who are IARs (Form ADV 5.B(3))
- 0
IAR registrations by jurisdiction are not available for this firm. IAR CE requirements by state.
Counts only. AdvisorIQ does not list individual people.
Disclosures
On Form ADV Item 11 the firm answered yes to 0 disclosure questions. See the detail on IAPD.
Succession and acquired firms
On Form ADV Item 4 the firm did not report succeeding to another adviser's business.
Similar-sized firms in California
| Firm | City | RAUM |
|---|---|---|
| Parallel Advisors, LLC | San Francisco | $10.3 billion |
| Composition Wealth, LLC | Los Angeles | $9.5 billion |
| Axxcess Wealth Management, LLC | Carlsbad | $8.9 billion |
| Robertson Stephens | San Francisco | $8.8 billion |
| One Capital Management, LLC | Westlake Village | $8.5 billion |
The five independent RIAs nearest in regulatory assets with a main office in the same state.
Elsewhere
- Main Street Advisors on IAPD: Form ADV, brochures and disclosure detail.
- Firm website: www.mainstreetadvisors.com
- Independent RIAs in California
Firm data as of October 2, 2026, from ia100226.zip. Figures are as the firm reported them; corrections are made on Form ADV and appear after the next monthly reload.
Data as of October 2, 2026, from Form ADV. Sources: SEC registered adviser data (ia100226.zip) and IAPD compilation reports. How the directory is built.