Asset manager · Oaks, PA
SEI Investments Management Corp
SEC-registered investment adviser · CRD 105146 · SEC 801-24593
At a glance
SEI Investments Management Corp is an SEC-registered investment adviser based in Oaks, Pennsylvania, with $216.4 billion in regulatory assets under management as of its Form ADV filed September 1, 2026. Its largest client group by assets is investment companies, and it reports 111,685 individual clients. By Form ADV it is a asset manager, ranked 69th of 3,218 asset managers and 117th of 17,210 SEC-registered advisers by assets.
Main office 610-676-1000seic.comAs filed on Form ADV
- Regulatory AUM
- $216B
- Rank among asset managers
- #69 of 3,218
- Rank among all SEC RIAs
- #117 of 17,210
- Rank in Pennsylvania
- #9 of 564
- Individual clients
- 111,685
- High-net-worth clients
- 726
- Accounts
- 112,627
- Discretionary
- 98% of AUM
- Employees
- 434
- Advisory staff
- 226
- Offices
- 4
Owners and executives on its Form ADV
- Timothy D. BartoGeneral Counsel
- Michael N. PetersonSenior Vice President
- Jennifer H. CampisiChief Compliance Officer
- Mark A. WarnerTreasurer/controller
- Bradley S. LandisBoard Member
- Sean P. SimkoBoard Member
- Nathan ShettyPresident
Custody and brokerage
Broker-dealer
Hybrid RIA
SEI Investments Management Corp is a hybrid RIA: 91 of its employees are also registered representatives of a broker-dealer. It names affiliated broker-dealers: SEI Investments (south Africa) Limited, SEI Investments Distribution Co. and Stratos Wealth Securities, LLC.
- SEI Investments (south Africa) Limited
- SEI Investments Distribution Co. ↗CRD 10690
An introducing broker-dealer: its trades clear through another firm, which holds the brokerage accounts. Its annual audited report filed with the SEC, February 2026
- Stratos Wealth Securities, LLC ↗CRD 290230
It doesn’t hold client accounts or customer funds itself. Its annual audited report filed with the SEC, March 2026
Its Form ADV brochure (filed September 2026) names SEI Investments Distribution Co. as the broker-dealer its advisers are registered with.
In addition, certain SIMC employees are also registered representatives of SIDCO.
Who it serves
| Client type | Clients | Regulatory AUM | Share |
|---|---|---|---|
| Investment companies | 1 | $101B | 47% |
| Individuals | 110,959 | $48B | 22% |
| Pooled investment vehicles | 18 | $45B | 21% |
| Pension and profit sharing plans | 343 | $9.6B | 4% |
| High-net-worth individuals | 726 | $5.0B | 2% |
| Charitable organizations | 465 | $3.9B | 2% |
| State or municipal government entities | 4 | $2.6B | 1% |
| Banking or thrift institutions | 93 | $936M | <1% |
| Corporations or other businesses | 35 | $488M | <1% |
| Other | 2 | $375M | <1% |
Private funds
SEI Investments Management Corp reports 17 private funds with $13B in gross assets: hedge funds, other private funds (Form ADV Item 7.B).
Disciplinary disclosures
SEI Investments Management Corp answers yes to 4 disclosure items in Item 11 of Form ADV (criminal, regulatory or civil matters involving the firm or its advisory affiliates). Read the details on the SEC’s adviser search ↗
Services
- Financial planning
- Portfolio management for individuals and small businesses
- Portfolio management for investment companies
- Portfolio management for pooled investment vehicles
- Portfolio management for businesses and institutions
- Pension consulting
- Selecting other advisers
- Periodicals or newsletters
- Educational seminars and workshops
How it’s paid
- A percentage of assets under management
- Fixed fees
- Performance-based fees
Form ADV and brochures on the SEC’s adviser search ↗seic.com ↗
AtlasMembers
The full record on SEI Investments Management Corp
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 139 peers of its type and size
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- Owners and executives, with titles and stakes
- 7 namedLocked
- Main office, fax and compliance officer
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- Filing changes this year, with alerts
- 5Locked
Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.
Background
Questions
How much does SEI Investments Management Corp manage?
SEI Investments Management Corp reports $216.4 billion in regulatory assets under management across 112,627 accounts, 98% of it on a discretionary basis, on its Form ADV filed September 1, 2026.
What kind of firm is SEI Investments Management Corp?
SEI Investments Management Corp is a asset manager by its Form ADV answers. Most of its assets are managed for funds, institutions or other businesses rather than individuals. It reports a bank or thrift among its related persons.
Who are SEI Investments Management Corp’s clients?
By assets, its largest client types are investment companies ($100.7 billion, 1 clients); individuals ($47.7 billion, 110,959 clients); pooled investment vehicles ($45.2 billion, 18 clients).
Does SEI Investments Management Corp manage private funds?
Yes. It reports 17 private funds with $13.2 billion in gross assets, including hedge funds, other private funds.
Does SEI Investments Management Corp have any disciplinary history?
SEI Investments Management Corp answers yes to 4 disclosure items in Item 11 of Form ADV, which covers criminal, regulatory and civil matters involving the firm or its advisory affiliates. The details are on the SEC’s adviser search.
Where these numbers come from
Every figure is SEI Investments Management Corp’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 (2026-09-01), 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). Ranks compare it by regulatory assets with every SEC-registered adviser and with firms of its type. 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 →