Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in SEIC held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 10.1M | $793.4M | +4.9% | 8.270% | 0.01% |
| 2 | LOOMIS SAYLES & CO L P | 8.6M | $677.1M | -1.3% | 7.058% | 0.91% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 6.1M | $480.7M | β | 5.011% | 0.03% |
| 4 | MORGAN STANLEY | 4.8M | $376.1M | -5.6% | 3.920% | 0.02% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 4.7M | $372.1M | β | 3.879% | 0.01% |
| 6 | STATE STREET CORP | 4.2M | $328.4M | -2.3% | 3.424% | 0.01% |
| 7 | BANK OF AMERICA CORP /DE/ | 2.9M | $229.2M | -0.1% | 2.389% | 0.02% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 2.8M | $222.1M | -2.2% | 2.315% | 0.01% |
| 9 | FMR LLC | 2.1M | $164.2M | +55.8% | 1.712% | 0.01% |
| 10 | DIMENSIONAL FUND ADVISORS LP | 1.9M | $147.0M | +1.1% | 1.532% | 0.03% |
| 11 | FIRST TRUST ADVISORS LP | 1.8M | $143.0M | +1.2% | 1.491% | 0.10% |
| 12 | Boston Partners | 1.8M | $138.9M | β | 1.448% | 0.15% |
| 13 | CAISSE DE DEPOT ET PLACEMENT DU QUEBEC | 1.2M | $94.0M | -13.2% | 0.980% | 0.15% |
| 14 | Invesco Ltd. | 1.1M | $89.9M | -33.9% | 0.937% | 0.01% |
| 15 | Boston Trust Walden Corp | 1.0M | $81.6M | -4.2% | 0.851% | 0.67% |
| 16 | ROYCE & ASSOCIATES LP | 996K | $78.2M | +9.9% | 0.815% | 0.77% |
| 17 | FRANKLIN RESOURCES INC | 983K | $77.1M | +20.1% | 0.804% | 0.02% |
| 18 | Bank of New York Mellon Corp | 936K | $73.5M | -5.5% | 0.766% | 0.01% |
| 19 | NORTHERN TRUST CORP | 906K | $71.1M | +1.6% | 0.741% | 0.01% |
| 20 | AMERIPRISE FINANCIAL INC | 870K | $68.2M | +5.9% | 0.711% | 0.02% |
| 21 | Clark Capital Management Group, Inc. | 838K | $65.7M | +29.7% | 0.685% | 0.41% |
| 22 | AMERICAN CAPITAL MANAGEMENT INC | 769K | $60.3M | +33.7% | 0.629% | 3.24% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 696K | $54.7M | +4.8% | 0.570% | 0.01% |
| 24 | VANGUARD FIDUCIARY TRUST CO | 590K | $46.3M | β | 0.483% | 0.01% |
| 25 | RAYMOND JAMES FINANCIAL INC | 572K | $44.9M | +7.5% | 0.468% | 0.01% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in SEIC β a direct measure of their conviction.
Filings activity in SEIC during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new SEIC position in Q1 2026
Institutions that fully closed their SEIC position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 553 | +0.2% | 59.81% | 2.44 pp | $6.54B | 3.9% |
| Q4 2025 | 552 | +3.2% | 62.25% | 1.65 pp | $6.80B | 2.6% |
| Q3 2025 | 535 | 3.6% | 63.90% | 30.69 pp | $6.98B | 32% |
| Q2 2025 | 555 | +3.9% | 94.59% | +39.89 pp | $10.34B | +73% |
| Q1 2025 | 534 | +1.3% | 54.70% | 1.47 pp | $5.98B | 2.6% |
| Q4 2024 | 527 | +8.7% | 56.17% | +10.09 pp | $6.14B | +22% |
| Q3 2024 | 485 | +1.0% | 46.08% | +0.67 pp | $5.04B | +1.5% |
| Q2 2024 | 480 | β | 45.41% | β | $4.96B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying SEIC stock.
Based on Q1 2026 13F filings, institutional ownership of SEI Investments Company stands at 59.8%, held across 553 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of SEIC, with approximately 10,110,337 shares worth $0.79B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of SEIC.
Our composite Smart Money Score for SEIC is 27 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
80 institutions opened new positions in SEIC during Q1 2026, while 79 fully exited. 152 added to existing positions and 316 trimmed.
SEIC institutional ownership fell by 2.44 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 58.0% of all reported 13F value in SEIC, and the top 25 account for 76.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
SEI Investments Company (SEIC) Institutional Ownership