Who owns SEI INVESTMENTS CO?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of SEIC from SEC Form 13F filings across 572 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 572 institutions disclosed 90.4M shares of SEI INVESTMENTS CO worth $7.93B — about 75.2% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
572
13F holders
$7.93B
value, 2026 filers
75.2%
of shares outstanding (90.4M sh)
84
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of SEIC's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 9.9M | $870.7M | 0.0% | 8.2% | -1.8% |
| 2 | LOOMIS SAYLES & CO L P | 8.5M | $744.0M | 0.9% | 7% | -1.7% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 6.1M | $538.6M | 0.0% | 5.1% | +0.2% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 4.7M | $411.0M | 0.0% | 3.9% | -1.2% |
| 5 | STATE STREET CORP | 4.3M | $372.9M | 0.0% | 3.5% | +1.6% |
| 6 | MORGAN STANLEY | 4.1M | $361.3M | 0.0% | 3.4% | -14.0% |
| 7 | Boston Partners | 3.1M | $271.4M | 0.2% | 2.6% | +74.8% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 3.0M | $259.1M | 0.0% | 2.5% | +4.3% |
| 9 | BANK OF AMERICA CORP /DE/ | 2.9M | $255.1M | 0.0% | 2.4% | -0.4% |
| 10 | FMR LLC | 2.5M | $220.2M | 0.0% | 2.1% | +20.0% |
| 11 | LORD, ABBETT & CO. LLC | 2.3M | $202.5M | 0.6% | 1.9% | +4.7% |
| 12 | DIMENSIONAL FUND ADVISORS LP | 2.0M | $172.1M | 0.0% | 1.6% | +4.8% |
| 13 | FIRST TRUST ADVISORS LP | 1.5M | $131.7M | 0.1% | 1.2% | -17.6% |
| 14 | Beutel, Goodman & Co Ltd. | 1.5M | $131.1M | 1.0% | 1.2% | -15.7% |
| 15 | Invesco Ltd. | 1.1M | $97.4M | 0.0% | 0.9% | -3.0% |
| 16 | ROYCE & ASSOCIATES LP | 1.1M | $92.1M | 0.7% | 0.9% | +5.4% |
| 17 | Caisse de depot et placement du Quebec | 1.0M | $87.9M | 0.1% | 0.8% | -16.3% |
| 18 | Boston Trust Walden Corp | 991,300 | $86.9M | 0.7% | 0.8% | -4.7% |
| 19 | NORTHERN TRUST CORP | 914,907 | $80.2M | 0.0% | 0.8% | +1.0% |
| 20 | Bank of New York Mellon Corp | 894,194 | $78.4M | 0.0% | 0.7% | -4.5% |
| 21 | NORGES BANKNEW | 887,116 | $77.8M | 0.0% | 0.7% | new |
| 22 | BARCLAYS PLC | 825,215 | $72.4M | 0.0% | 0.7% | +116.6% |
| 23 | AMERICAN CAPITAL MANAGEMENT INC | 745,323 | $65.4M | 2.9% | 0.6% | -3.0% |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 695,446 | $61.0M | 0.0% | 0.6% | -0.1% |
| 25 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 660,498 | $57.9M | 0.0% | 0.5% | +16.3% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.