SEIC SEI Investments Company
SEI Investments Company (SEIC) Institutional Ownership
What the institutions did with SEIC last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 9.9M | 11.0% |
| LOOMIS SAYLES & CO L P | 8.5M | 9.4% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.1M | 6.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.7M | 5.2% |
| STATE STREET CORP | 4.3M | 4.7% |
| MORGAN STANLEY | 4.1M | 4.6% |
| Boston Partners | 3.1M | 3.4% |
| GEODE CAPITAL MANAGEMENT, LLC | 3.0M | 3.3% |
| BANK OF AMERICA CORP /DE/ | 2.9M | 3.2% |
| FMR LLC | 2.5M | 2.8% |
| LORD, ABBETT & CO. LLC | 2.3M | 2.6% |
| DIMENSIONAL FUND ADVISORS LP | 2.0M | 2.2% |
| FIRST TRUST ADVISORS LP | 1.5M | 1.7% |
| Beutel, Goodman & Co Ltd. | 1.5M | 1.7% |
| Invesco Ltd. | 1.1M | 1.2% |
| ROYCE & ASSOCIATES LP | 1.1M | 1.2% |
| Caisse de depot et placement du Quebec | 1.0M | 1.1% |
| Boston Trust Walden Corp | 991.3K | 1.1% |
| NORTHERN TRUST CORP | 914.9K | 1.0% |
| Bank of New York Mellon Corp | 894.2K | 1.0% |
| NORGES BANK | 887.1K | 1.0% |
| BARCLAYS PLC | 825.2K | 0.9% |
| AMERICAN CAPITAL MANAGEMENT INC | 745.3K | 0.8% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 695.4K | 0.8% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 660.5K | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Boston Partners | Increased | 1.8M | 3.1M | +1.3M |
| MORGAN STANLEY | Reduced | 4.8M | 4.1M | -673.1K |
| JANE STREET GROUP, LLC | Increased | 6.3K | 578.8K | +572.5K |
| PFA Pension, Forsikringsaktieselskab | Sold Out | 519.3K | 0 | -519.3K |
| FRANKLIN RESOURCES INC | Reduced | 983.1K | 512.8K | -470.3K |
| BARCLAYS PLC | Increased | 381.0K | 825.2K | +444.2K |
| Azora Capital LP | New | 0 | 443.2K | +443.2K |
| FMR LLC | Increased | 2.1M | 2.5M | +417.7K |
| Prana Capital Management, LP | Reduced | 464.2K | 139.2K | -325.0K |
| FIRST TRUST ADVISORS LP | Reduced | 1.8M | 1.5M | -320.7K |
| AMERIPRISE FINANCIAL INC | Reduced | 869.5K | 578.4K | -291.1K |
| Beutel, Goodman & Co Ltd. | Reduced | 1.8M | 1.5M | -278.5K |
| Man Group plc | Reduced | 360.9K | 87.5K | -273.4K |
| ROYAL BANK OF CANADA | Reduced | 416.7K | 161.0K | -255.6K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Reduced | 455.9K | 216.1K | -239.9K |
| Clark Capital Management Group, Inc. | Reduced | 837.8K | 638.9K | -198.9K |
| Caisse de depot et placement du Quebec | Reduced | 1.2M | 1.0M | -195.6K |
| BlackRock, Inc. | Reduced | 10.1M | 9.9M | -182.8K |
| VICTORY CAPITAL MANAGEMENT INC | Reduced | 427.6K | 270.0K | -157.6K |
| Quantinno Capital Management LP | Increased | 382.4K | 532.4K | +150.0K |
| MILLENNIUM MANAGEMENT LLC | Increased | 118.8K | 266.2K | +147.5K |
| LOOMIS SAYLES & CO L P | Reduced | 8.6M | 8.5M | -146.8K |
| GOLDMAN SACHS GROUP INC | Increased | 324.1K | 461.2K | +137.1K |
| Qube Research & Technologies Ltd | Sold Out | 125.0K | 0 | -125.0K |
| Janney Montgomery Scott LLC | Reduced | 132.9K | 9.2K | -123.7K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 2.8M | 3.0M | +122.8K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 399.8K | 284.7K | -115.1K |
| Fideuram Asset Management (Ireland) dac | New | 0 | 113.2K | +113.2K |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | Increased | 411.9K | 518.3K | +106.5K |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | Increased | 13.1K | 119.4K | +106.4K |
| LORD, ABBETT & CO. LLC | Increased | 2.2M | 2.3M | +104.6K |
| TWO SIGMA INVESTMENTS, LP | Increased | 19.2K | 118.7K | +99.5K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 568.0K | 660.5K | +92.5K |
| BI Asset Management Fondsmaeglerselskab A/S | Increased | 70.4K | 160.6K | +90.1K |
| Interval Partners, LP | Increased | 136.2K | 226.0K | +89.8K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 1.9M | 2.0M | +89.6K |
| Bridgewater Associates, LP | Reduced | 232.7K | 144.4K | -88.3K |
| JPMORGAN CHASE & CO | Reduced | 461.7K | 375.4K | -86.3K |
| AQR CAPITAL MANAGEMENT LLC | Reduced | 420.0K | 334.3K | -85.7K |
| Horizon Investments, LLC | Increased | 3.1K | 87.0K | +83.9K |
| Balyasny Asset Management L.P. | Increased | 225.7K | 308.1K | +82.4K |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO | Increased | 219.6K | 300.9K | +81.3K |
| Connor, Clark & Lunn Investment Management Ltd. | Increased | 342.5K | 421.0K | +78.5K |
| Rockefeller Capital Management L.P. | Increased | 152.6K | 228.0K | +75.5K |
| OSSIAM | New | 0 | 73.1K | +73.1K |
| Brevan Howard Capital Management LP | New | 0 | 66.5K | +66.5K |
| STATE STREET CORP | Increased | 4.2M | 4.3M | +66.4K |
| Tidal Investments LLC | Increased | 161.5K | 226.7K | +65.2K |
| TD Asset Management Inc | Reduced | 107.6K | 48.2K | -59.4K |
| IFG Advisory, LLC | New | 0 | 59.3K | +59.3K |
| CITIGROUP INC | Increased | 34.0K | 93.1K | +59.1K |
| Vestcor Inc | Reduced | 111.6K | 52.8K | -58.8K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 4.7M | 4.7M | -55.5K |
| APG Asset Management N.V. | Sold Out | 54.8K | 0 | -54.8K |
| Robeco Institutional Asset Management B.V. | Reduced | 104.8K | 50.2K | -54.6K |
| ROYCE & ASSOCIATES LP | Increased | 996.5K | 1.1M | +53.8K |
| Legal & General Group Plc | Reduced | 188.6K | 136.4K | -52.2K |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | Increased | 1.5K | 53.5K | +52.0K |
| Pathstone Holdings, LLC | Increased | 30.9K | 82.8K | +51.8K |
| HRT FINANCIAL LP | New | 0 | 50.8K | +50.8K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.