Wealth manager, independent · LOS Angeles, CA
Seia
Signature Estate & Investment Advisors LLC · SEC-registered investment adviser · CRD 108163 · SEC 801-56288
At a glance
Seia is an SEC-registered investment adviser based in LOS Angeles, California, with $23B in regulatory assets under management as of its Form ADV filed September 14, 2026. It reports 9,520 individual clients, 4,920 of them high-net-worth, holding an average of about $2.3 million each, and 241 employees. That ranks it 46th among the nation’s 5,657 independent wealth management RIAs and 7th of 714 in California. It reports 2 custodians for its clients’ separately managed accounts: Charles Schwab and Fidelity.
Main office 310-712-2323seia.comLinkedInAs filed on Form ADV
- Regulatory AUM
- $23B
- Rank among independent wealth managers
- #46 of 5,657
- Rank among all SEC RIAs
- #810 of 17,210
- Rank in California
- #7 of 714
- Individual clients
- 9,520
- High-net-worth clients
- 4,920
- Accounts
- 9,833
- Discretionary
- 16% of AUM
- Employees
- 241
- Advisory staff
- 128
- Offices
- 26
Owners and executives on its Form ADV
- Brian D. HolmesCEO
- Eric Z. RosenChief Compliance Officer
- Matthew J. MatrisianPresident
- Stephen V MastersonChief Financial Officer
- Eric Z. RosenChief Operating Officer
- Alex KimDeputy Compliance Officer
Custody and brokerage
Broker-dealer
Hybrid RIA
Seia is a hybrid RIA: 138 of its employees are also registered representatives of a broker-dealer. It names an affiliated broker-dealer: Signature Estate Securities, LLC.
- Signature Estate Securities, LLC ↗CRD 18923
It doesn’t hold client accounts or customer funds itself. Its annual audited report filed with the SEC, April 2026
Its Form ADV brochure (filed September 2026) names Signature Estate Securities as the broker-dealer its advisers are registered with.
September 14, 2026 HEADQUARTERS 2121 AVENUE OF THE STARS SUITE 1600 LOS ANGELES, CA 90067 TELEPHONE 310.712.2323 FACSIMILE 310.712.2345 WWW.SEIA.COM Securities offered through Signature Estate Securities, LLC member FINRA/SIPC.
Who it serves
| Client type | Clients | Regulatory AUM | Share |
|---|---|---|---|
| High-net-worth individuals | 4,920 | $17B | 75% |
| Individuals | 4,600 | $4.8B | 21% |
| Corporations or other businesses | 196 | $586M | 3% |
| Pension and profit sharing plans | 95 | $174M | <1% |
| Charitable organizations | 22 | $100M | <1% |
Disciplinary disclosures
Seia reports no disciplinary disclosures in Item 11 of Form ADV. Read the details on the SEC’s adviser search ↗
Services
- Financial planning
- Portfolio management for individuals and small businesses
- Portfolio management for businesses and institutions
- Selecting other advisers
- Educational seminars and workshops
How it’s paid
- A percentage of assets under management
- Hourly charges
- Fixed fees
Form ADV and brochures on the SEC’s adviser search ↗seia.com ↗
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The full record on Seia
Ten years of SEC filings, its owners and contacts, and how it stacks up against its peers. Atlas members see all of it.
- Assets, accounts, clients and staff, ten years of filings
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- Growth over one, three and five years
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- Rank against 200 peers of its type and size
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- Owners and executives, with titles and stakes
- 6 namedLocked
- Main office, fax and compliance officer
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- Filing changes this year, with alerts
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Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.
Similar-size RIAs in California
All of California →| Firm | Regulatory AUM | Clients |
|---|---|---|
| EP Wealth AdvisorsTorrance | $45B | 19,618 |
| LidoLOS Angeles | $43B | 13,043 |
| Jordan Park Group LLCSAN Francisco | $23B | 163 |
| Baker Street Advisors, LLCSAN Francisco | $21B | 504 |
| Comprehensive Financial Management LLCLOS Gatos | $19B | 13 |
| Aspiriant, LLCLOS Angeles | $18B | 2,310 |
Compare Seia with
- Seia vs Jordan Park Group LLC $23B · SAN Francisco, CA
- Seia vs Johnson Investment Counsel, Inc. $23B · Cincinnati, OH
- Seia vs Baker Street Advisors, LLC $21B · SAN Francisco, CA
- Seia vs Summit Trail Advisors, LLC $20B · New York, NY
Background
Questions
How much does Seia manage?
Seia reports $23B in regulatory assets under management across 9,833 accounts, 16% of it on a discretionary basis, on its Form ADV filed September 14, 2026.
How many clients does Seia have?
It reports 9,520 individual clients: 4,920 high-net-worth individuals and 4,600 other individuals. Individuals account for about 96% of its regulatory assets.
Where is Seia headquartered?
Its main office is in LOS Angeles, California. It reports 26 offices in total and 241 employees, 128 of whom perform investment advisory functions.
How does Seia charge clients?
On Form ADV it lists these forms of compensation: a percentage of assets under management; hourly charges; fixed fees. Fees and minimums are set out in its Form ADV Part 2A brochure, available on the SEC’s adviser search.
What custodian does Seia use?
It reports 2 custodians for its clients’ separately managed accounts: Charles Schwab and Fidelity. On Schedule D of its Form ADV filed September 14, 2026, it reports these amounts held: Charles Schwab ($16B); Fidelity ($6.1B). Form ADV lists only custodians holding 10% or more of separately managed account assets.
Is Seia a hybrid RIA with a broker-dealer?
Seia is a hybrid RIA: 138 of its employees are also registered representatives of a broker-dealer. It names an affiliated broker-dealer: Signature Estate Securities, LLC. Those representatives can also earn commissions on brokerage business through the broker-dealer, where different rules apply than for advisory accounts.
Is Seia a fiduciary?
As an SEC-registered investment adviser, Seia owes its advisory clients a fiduciary duty under the Investment Advisers Act of 1940, which includes duties of care and loyalty. 138 of its employees are also registered representatives of a broker-dealer, where different rules apply to brokerage recommendations.
Where these numbers come from
Every figure is Seia’s own answer on its latest Form ADV, from the SEC’s registered-adviser list as of October 1, 2026: regulatory assets and accounts (Item 5.F), clients by type (5.D), employees (5.A and 5.B), compensation (5.E) and services (5.G). Custodians come from Schedule D 5.K(3) of its latest filing (2026-09-14), which lists those holding 10% or more of separately managed account assets and the amount at each. “Hybrid” means some employees are also registered representatives of a broker-dealer (Item 5.B(2)); affiliated broker-dealers are the related persons it lists in Item 7.A and Schedule D. Firm type comes from its own answers: broker-dealer firms are registered broker-dealers themselves (Item 6.A); private fund advisers manage mostly private funds (Item 7.B, 5.D); wealth managers manage at least half their assets for individuals (5.D). Its national rank compares it with every US-based independent wealth management RIA, the same field as The Largest RIAs. Figures are as of the firm’s last annual update, so they can lag recent deals and market moves. Regulatory AUM counts assets the firm continuously supervises and can differ from what a firm markets.
Not an endorsement or a recommendation. Before hiring any adviser, read its Form ADV Part 2A brochure and check its record on the SEC’s adviser search. How to check a financial advisor →