Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in SEI held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.1M | $233.0M | -4.4% | 5.743% | 0.00% |
| 2 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 2.6M | $144.3M | -29.8% | 3.558% | 7.64% |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 2.5M | $141.9M | +72.7% | 3.498% | 0.02% |
| 4 | MILLENNIUM MANAGEMENT LLC | 2.3M | $129.2M | +23.9% | 3.184% | 0.09% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 2.0M | $115.3M | β | 2.843% | 0.00% |
| 6 | TWO SIGMA INVESTMENTS, LP | 1.9M | $109.7M | +79.8% | 2.705% | 0.09% |
| 7 | FMR LLC | 1.9M | $105.3M | -18.6% | 2.595% | 0.01% |
| 8 | Encompass Capital Advisors LLC | 1.8M | $98.9M | -31.6% | 2.438% | 4.03% |
| 9 | MORGAN STANLEY | 1.7M | $96.5M | -18.4% | 2.379% | 0.01% |
| 10 | DRIEHAUS CAPITAL MANAGEMENT LLC | 1.6M | $92.0M | +32.6% | 2.268% | 0.68% |
| 11 | MARSHALL WACE, LLP | 1.5M | $83.1M | +75.4% | 2.048% | 0.09% |
| 12 | STATE STREET CORP | 1.4M | $76.6M | +15.4% | 1.888% | 0.00% |
| 13 | ADVENT INTERNATIONAL CORP/MA | 1.2M | $70.1M | -1.8% | 1.729% | 1.65% |
| 14 | JENNISON ASSOCIATES LLC | 1.2M | $66.7M | +215.1% | 1.644% | 0.05% |
| 15 | PRINCIPAL FINANCIAL GROUP INC | 1.1M | $64.7M | -21.9% | 1.595% | 0.03% |
| 16 | GOLDMAN SACHS GROUP INC | 1.1M | $64.1M | -39.8% | 1.580% | 0.01% |
| 17 | Valiant Capital Management, L.P. | 1.1M | $63.3M | +52.4% | 1.560% | 4.23% |
| 18 | Situational Awareness Partners LP | 1.1M | $62.5M | β | 1.540% | 1.18% |
| 19 | Situational Awareness LP | 1.1M | $62.5M | -40.8% | 1.540% | 1.18% |
| 20 | GEODE CAPITAL MANAGEMENT, LLC | 1.1M | $62.2M | +7.6% | 1.534% | 0.00% |
| 21 | WELLINGTON MANAGEMENT GROUP LLP | 929K | $52.5M | -25.5% | 1.294% | 0.01% |
| 22 | CITADEL ADVISORS LLC | 912K | $51.5M | -34.8% | 1.270% | 0.02% |
| 23 | Value Aligned Research Advisors, LLC | 897K | $50.7M | -8.1% | 1.250% | 0.25% |
| 24 | DIMENSIONAL FUND ADVISORS LP | 871K | $49.2M | +19.6% | 1.214% | 0.01% |
| 25 | Qube Research & Technologies Ltd | 793K | $44.8M | -31.3% | 1.105% | 0.05% |
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 SEI β a direct measure of their conviction.
Filings activity in SEI during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new SEI position in Q1 2026
Institutions that fully closed their SEI 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 | 347 | +5.5% | 67.83% | +9.40 pp | $3.60B | +16% |
| Q4 2025 | 329 | +24% | 58.43% | +19.51 pp | $3.10B | +50% |
| Q3 2025 | 265 | +24% | 38.92% | +14.45 pp | $2.07B | +59% |
| Q2 2025 | 213 | +7.6% | 24.47% | +7.67 pp | $1.30B | +46% |
| Q1 2025 | 198 | +13% | 16.80% | 0.34 pp | $893M | 2.0% |
| Q4 2024 | 176 | +30% | 17.14% | +11.59 pp | $910M | +209% |
| Q3 2024 | 135 | +5.5% | 5.55% | +1.98 pp | $295M | +55% |
| Q2 2024 | 128 | β | 3.57% | β | $190M | 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 SEI stock.
Based on Q1 2026 13F filings, institutional ownership of Solaris Energy Infrastructure, Inc. stands at 67.8%, held across 347 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of SEI, with approximately 4,122,436 shares worth $0.23B as of Q1 2026.
Yes β 4 widely-followed marquee investors appear among the top 25 institutional holders of SEI, including SUSQUEHANNA INTERNATIONAL GROUP, LLP, MILLENNIUM MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP, CITADEL ADVISORS LLC.
Our composite Smart Money Score for SEI is 73 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
90 institutions opened new positions in SEI during Q1 2026, while 72 fully exited. 204 added to existing positions and 50 trimmed.
SEI institutional ownership rose by 9.40 percentage points quarter-over-quarter, with a net change of +18 holders.
The top 10 institutions account for 35.1% of all reported 13F value in SEI, and the top 25 account for 60.8%.
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.
Solaris Energy Infrastructure, Inc. (SEI) Institutional Ownership