Solaris Energy Infrastructure, Inc. (SEI) shareholders
SEINYSEOil & Gas Field Machinery & EquipmentFiscal year ends December 31
Financials through Q3 FY2026, quarter ended Sep 30, 2026Last filing: 10-Q on Nov 6, 2026Score 12/30102% above fair value
$63.81−0.69 (-1.07%)
Close on Nov 13, 2026Market cap $4.89BP/E –Yield 0.75%
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
92.8%
71M of 77M shares
Institutional holders
432
115 new, 39 sold out
Net institutional buying
7M
In Q2 2026
Insider trades, 12 months
10 buys · 11 sales
Net sold $299.24M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| BlackRock, Inc. | 8,024,851 | 13.10% | 13G (passive) amendment | Jul 31, 2026 |
| John A. Johnson Joint filing with J Turbines, Inc. (13.40%) | 6,264,783 | 13.40% | 13D (active) amendment | May 5, 2025 |
| William A. Zartler | 5,289,542 | 10.00% | 13G (passive) amendment | Dec 31, 2025 |
| Yorktown X Company LP Joint filing with Yorktown Energy Partners X, L.P. (7.20%), Yorktown X Associates LLC (7.20%) | 5,079,234 | 7.20% | 13G (passive) amendment | May 6, 2026 |
| Solaris Energy Capital, LLC | 3,513,496 | 8.50% | 13G (passive) amendment | Dec 31, 2024 |
| Encompass Capital Advisors LLC Joint filing with Todd J. Kantor (5.24%) | 2,559,543 | 5.24% | 13G (passive) amendment | Dec 31, 2025 |
| Matthew Curtis Joint filing with Summit Partners Public Asset Management, LLC (6.48%), Philip Furse (6.48%) and 3 more | 2,399,191 | 6.48% | 13G (passive) amendment | Dec 31, 2024 |
| Millennium Group Management LLC Joint filing with Millennium Management LLC (5.00%), Israel A. Englander (5.00%) | 2,033,354 | 5.00% | 13G (passive) | May 9, 2025 |
| Philip Furse Joint filing with Summit Partners Public Asset Management, LLC (5.22%), Timothy Albright (5.22%) and 2 more | 1,985,844 | 5.22% | 13G (passive) amendment | Mar 31, 2025 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of SEI | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| BlackRock, Inc. | 5,204,415 | 6.80% | $418.75M | +1,081,979 | 0.01% |
| Encompass Capital Advisors LLC | 2,519,604 | 3.29% | $202.73M | +769,604 | 7.21% |
| Vanguard Capital Management LLC | 2,447,630 | 3.20% | $196.94M | +407,179 | 0.00% |
| Morgan Stanley | 2,024,283 | 2.64% | $162.87M | +316,828 | 0.01% |
| Two Sigma Investments, LP | 1,979,861 | 2.59% | $159.30M | +38,315 | 0.12% |
| Summit Partners Public Asset Management, LLC | 1,692,838 | 2.21% | $136.21M | −36,217 | 2.39% |
| Jennison Associates LLC | 1,691,193 | 2.21% | $136.07M | +511,457 | 0.08% |
| Valiant Capital Management, L.P. | 1,604,346 | 2.10% | $129.09M | +484,843 | 5.21% |
| Driehaus Capital Management LLC | 1,584,985 | 2.07% | $127.53M | −43,189 | 0.74% |
| FMR LLC | 1,581,402 | 2.07% | $127.24M | −281,159 | 0.01% |
| State Street Corp | 1,487,464 | 1.94% | $119.65M | +132,118 | 0.00% |
| Van Eck Associates Corp | 1,478,669 | 1.93% | $118.97M | −475,786 | 0.07% |
| Geode Capital Management, LLC | 1,352,450 | 1.77% | $108.84M | +251,299 | 0.01% |
| Goldman Sachs Group Inc | 1,278,618 | 1.67% | $102.88M | +144,755 | 0.01% |
| Ameriprise Financial Inc | 1,144,927 | 1.50% | $92.12M | +419,904 | 0.02% |
| Clearbridge Investments, LLC | 1,138,159 | 1.49% | $91.58M | +1,026,595 | 0.08% |
| Situational Awareness LP | 1,129,621 | 1.48% | $90.89M | +24,070 | 0.45% |
| Korea Investment CORP | 1,096,000 | 1.43% | $88.18M | +425,486 | 0.17% |
| Advent International, L.P. | 1,094,427 | 1.43% | $88.06M | −146,935 | 0.50% |
| Principal Financial Group Inc | 1,072,200 | 1.40% | $86.27M | −72,452 | 0.04% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 432 | 71M | 92.8% | 115 / 158 | 123 / 39 | 17M | 10M |
| Q1 2026 | 363 | 65M | 85.2% | 91 / 126 | 112 / 59 | 16M | 15M |
| Q4 2025 | 335 | 68M | 88.4% | 102 / 124 | 85 / 33 | 22M | 9M |
| Q3 2025 | 272 | 55M | 72.3% | 88 / 83 | 75 / 26 | 18M | 10M |
| Q2 2025 | 212 | 48M | 62.6% | 54 / 92 | 47 / 37 | 12M | 5M |
| Q1 2025 | 200 | 41M | 53.5% | 56 / 90 | 40 / 30 | 13M | 7M |
| Q4 2024 | 178 | 35M | 45.8% | 63 / 47 | 51 / 20 | 16M | 5M |
| Q3 2024 | 135 | 24M | 31.4% | 38 / 38 | 46 / 30 | 10M | 7M |
| Q2 2024 | 129 | 24M | 31.0% | 19 / 41 | 51 / 22 | 3M | 7M |
| Q1 2024 | 132 | 28M | 36.6% | 25 / 42 | 50 / 33 | 8M | 5M |
| Q4 2023 | 140 | 25M | 32.6% | 30 / 53 | 37 / 9 | 6M | 3M |
| Q3 2023 | 119 | 22M | 28.2% | 27 / 34 | 35 / 8 | 2M | 2M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
327 funds held SEI in Q2 2026, 38% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| Fund | Shares | % of SEI | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 1,762,092 | 2.30% | $141.78M | 0.01% | Jun 30, 2026 |
| iShares Russell 2000 ETF | 1,371,420 | 1.79% | $110.34M | 0.13% | Jun 30, 2026 |
| VanEck Oil Services ETF | 1,286,378 | 1.68% | $103.50M | 5.20% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 629,688 | 0.82% | $50.66M | 0.05% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund | 584,242 | 0.76% | $30.04M | 0.09% | Jul 31, 2026 |
| PGIM Jennison Small Company Fund | 570,128 | 0.74% | $45.87M | 1.32% | Jun 30, 2026 |
| Westwood Salient Mlp & Energy | 517,696 | 0.68% | $26.61M | 1.87% | Jul 31, 2026 |
| SmallCap Fund | 501,200 | 0.65% | $25.77M | 1.24% | Jul 31, 2026 |
| iShares Russell 2000 Growth ETF | 493,233 | 0.64% | $39.69M | 0.26% | Jun 30, 2026 |
| Vanguard Explorer Fund | 481,850 | 0.63% | $24.77M | 0.11% | Jul 31, 2026 |
| Oberweis Small-Cap Opportunities Fund | 471,400 | 0.62% | $37.93M | 1.34% | Jun 30, 2026 |
| T. Rowe Price New Horizons Fund, Inc. | 463,300 | 0.61% | $37.28M | 0.25% | Jun 30, 2026 |
| BlackRock Strategic Income Opportunities Portfolio | 403,846 | 0.53% | $32.49M | 0.07% | Jun 30, 2026 |
| ClearBridge Small Cap Growth Fund | 358,400 | 0.47% | $18.43M | 0.97% | Jul 31, 2026 |
| Voya Small Cap Growth Fund | 347,622 | 0.45% | $24.17M | 1.14% | May 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Amanda M. Brock | Co-Chief Executive Officer, Director | 276,080 | 0.36% | Mar 3, 2026 |
| Cynthia M. Durrett | Chief Administrative Officer, Director | 319,565 | 0.42% | Mar 3, 2026 |
| William A. Zartler | Chairman and Co-CEO, Director, 10% owner | 5,555,198 | 7.26% | Mar 3, 2026 |
| Christopher P. Wirtz | Chief Accounting Officer | 34,782 | 0.05% | Jun 2, 2026 |
| Christopher M. Powell | Chief Legal Officer | 141,790 | 0.19% | May 12, 2026 |
| Kyle S. Ramachandran | President | 954,456 | 1.25% | Mar 3, 2026 |
| Stephan E. Tompsett | Chief Financial Officer | 30,000 | 0.04% | Feb 17, 2026 |
| Aj Teague | Director | 132,495 | 0.17% | Nov 12, 2026 |
| Mario Max Yzaguirre | Director | 11,484 | 0.01% | Aug 25, 2026 |
| Ray N. Walker JR | Director | 8,835 | 0.01% | Aug 25, 2026 |
| Laurie H. Argo | Director | 48,170 | 0.06% | Aug 25, 2026 |
| W. Howard Keenan JR | Director | 7,171,273 | 9.37% | Aug 25, 2026 |
| Edgar R. Giesinger JR. | Director | 94,202 | 0.12% | Aug 25, 2026 |
| James R. Burke | Director | 52,305 | 0.07% | Aug 25, 2026 |
| KTR Management Company, LLC | 10% owner | 0 | – | May 4, 2026 |
| John Tuma | 10% owner | 2,000,000 | 2.61% | May 4, 2026 |
| John Abraham Johnson | 10% owner | 6,114,783 | 7.99% | Jul 30, 2025 |
| J Turbines, Inc. | 10% owner | 2,114,783 | 2.76% | Jul 30, 2025 |
| Kelly L. Price | – | 271,519 | 0.35% | Mar 4, 2025 |
| Yorktown Energy Partners X, L.P. | 10% owner | 8,054,234 | 10.52% | Dec 18, 2024 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Aj Teague Director | Nov 11, 2026 | Buy | +150 | $65.81 | $9.87K | 15,110 |
| Aj Teague Director | Nov 10, 2026 | Buy | +170 | $59.50 | $10.12K | 117,385 |
| Aj Teague Director | Nov 9, 2026 | Buy | +350 | $59.23 | $20.73K | 117,215 |
| Aj Teague Director | Sep 8, 2026 | Buy | +3,900 | $64.25 | $250.58K | 14,960 |
| Aj Teague Director | Sep 8, 2026 | Buy | +3,900 | $64.21 | $250.42K | 116,865 |
| James R. Burke Director | Aug 23, 2026 | Award | +3,075 | – | – | 8,771 |
| Edgar R. Giesinger JR. Director | Aug 23, 2026 | Award | +3,246 | – | – | 94,202 |
| Aj Teague Director | Aug 23, 2026 | Award | +3,075 | – | – | 112,965 |
| W. Howard Keenan JR Director | Aug 23, 2026 | Award | +2,989 | – | – | 92,039 |
| Laurie H. Argo Director | Aug 23, 2026 | Award | +3,331 | – | – | 48,170 |
| Ray N. Walker JR Director | Aug 23, 2026 | Award | +3,075 | – | – | 8,835 |
| Mario Max Yzaguirre Director | Aug 23, 2026 | Award | +3,160 | – | – | 11,484 |
| Christopher P. Wirtz Chief Accounting Officer | Jun 1, 2026 | Tax withholding | −1,303 | $69.54 | $90.61K | 34,782 |
| Christopher P. Wirtz Chief Accounting Officer | May 13, 2026 | Sale | −700 | $77.22 | $54.05K | 36,085 |
| Laurie H. Argo Director | May 12, 2026 | Sale | −5,200 | $72.88 | $378.98K | 44,839 |
| Christopher M. Powell Chief Legal Officer | May 11, 2026 | Sale | −9,179 | $73.90 | $678.33K | 141,790 |
| Christopher M. Powell Chief Legal Officer | May 11, 2026 | Sale | −25,492 | $74.84 | $1.91M | 116,298 |
| Christopher M. Powell Chief Legal Officer | May 11, 2026 | Sale | −2,181 | $75.33 | $164.29K | 114,117 |
| Aj Teague Director | May 8, 2026 | Buy | +3,425 | $72.98 | $249.96K | 109,890 |
| Aj Teague Director | May 8, 2026 | Buy | +2,750 | $72.98 | $200.70K | 11,060 |
| Ray N. Walker JR Director | May 8, 2026 | Sale | −56,841 | $72.11 | $4.10M | 5,760 |
| W. Howard Keenan JR Director | May 6, 2026 | Conversion | +2,000,000 | – | – | 2,000,000 |
| W. Howard Keenan JR Director | May 6, 2026 | Sale | −2,000,000 | $74.50 | $149.00M | 0 |
| W. Howard Keenan JR Director | May 6, 2026 | Other | −2,000,000 | – | – | 5,079,234 |
| KTR Management Company, LLC 10% owner | Apr 30, 2026 | Sale | −2,000,000 | $70.75 | $141.50M | 0 |
| KTR Management Company, LLC 10% owner | Apr 30, 2026 | Other | −2,000,000 | – | – | 0 |
| KTR Management Company, LLC 10% owner | Apr 30, 2026 | Conversion | +2,000,000 | – | – | 2,000,000 |
| Amanda M. Brock Co-Chief Executive Officer, Director | Mar 1, 2026 | Award | +135,000 | – | – | 276,080 |
| Cynthia M. Durrett Chief Administrative Officer, Director | Mar 1, 2026 | Tax withholding | −26,940 | $49.63 | $1.34M | 154,527 |
| Cynthia M. Durrett Chief Administrative Officer, Director | Mar 1, 2026 | Award | +21,444 | – | – | 152,596 |
| Cynthia M. Durrett Chief Administrative Officer, Director | Mar 1, 2026 | Award | +28,871 | – | – | 181,467 |
| William A. Zartler Chairman and Co-CEO, Director, 10% owner | Mar 1, 2026 | Award | +115,656 | – | – | 1,314,883 |
| William A. Zartler Chairman and Co-CEO, Director, 10% owner | Mar 1, 2026 | Award | +150,000 | – | – | 1,199,227 |
| Christopher P. Wirtz Chief Accounting Officer | Mar 1, 2026 | Award | +3,296 | – | – | 37,177 |
| Christopher P. Wirtz Chief Accounting Officer | Mar 1, 2026 | Award | +1,814 | – | – | 38,991 |
| Christopher P. Wirtz Chief Accounting Officer | Mar 1, 2026 | Tax withholding | −2,206 | $49.63 | $109.48K | 36,785 |
| Kyle S. Ramachandran President | Mar 1, 2026 | Tax withholding | −49,902 | $49.63 | $2.48M | 407,779 |
| Kyle S. Ramachandran President | Mar 1, 2026 | Award | +37,004 | – | – | 407,342 |
| Kyle S. Ramachandran President | Mar 1, 2026 | Award | +50,339 | – | – | 457,681 |
| Christopher M. Powell Chief Legal Officer | Mar 1, 2026 | Award | +29,723 | – | – | 178,503 |
| Christopher M. Powell Chief Legal Officer | Mar 1, 2026 | Tax withholding | −27,534 | $49.63 | $1.37M | 150,969 |
| Christopher M. Powell Chief Legal Officer | Mar 1, 2026 | Award | +18,165 | – | – | 148,780 |
| Stephan E. Tompsett Chief Financial Officer | Feb 12, 2026 | Award | +30,000 | – | – | 30,000 |
| Aj Teague Director | Dec 17, 2025 | Buy | +2,310 | $43.13 | $99.63K | 106,465 |
| Aj Teague Director | Dec 17, 2025 | Buy | +2,310 | $43.11 | $99.58K | 8,310 |
| Amanda M. Brock Co-Chief Executive Officer, Director | Dec 17, 2025 | Buy | +3,669 | $40.89 | $150.03K | 141,080 |
| Laurie H. Argo Director | Dec 17, 2025 | Sale | −2,300 | $44.25 | $101.78K | 50,039 |
| Cynthia M. Durrett CHIEF ADMINISTRATIVE OFFICER, Director | Dec 17, 2025 | Sale | −47,011 | $44.62 | $2.10M | 131,152 |
| James R. Burke Director | Dec 10, 2025 | Sale | −11,277 | $53.03 | $598.02K | 5,696 |
| John Tuma 10% owner | Nov 4, 2025 | Other | −2,114,783 | – | – | 2,000,000 |
| John Tuma 10% owner | Nov 4, 2025 | Sale | −2,114,783 | $50.15 | $106.06M | 0 |
| John Tuma 10% owner | Nov 4, 2025 | Conversion | +2,114,783 | – | – | 2,114,783 |
| Amanda M. Brock Co-Chief Executive Officer, Director | Oct 16, 2025 | Award | +125,000 | – | – | 137,411 |
| James R. Burke Director | Sep 10, 2025 | Sale | −5,000 | $29.22 | $146.10K | 16,973 |
| William A. Zartler CHAIRMAN AND CEO, Director, 10% owner | Sep 9, 2025 | Buy | +10,000 | $24.83 | $248.30K | 1,049,227 |
| Kyle S. Ramachandran PRESIDENT AND CFO | Sep 9, 2025 | Buy | +2,000 | $25.00 | $50.00K | 370,338 |
| Christopher M. Powell CHIEF LEGAL OFFICER | Aug 26, 2025 | Sale | −12,750 | $30.00 | $382.50K | 130,615 |
| Edgar R. Giesinger JR. Director | Aug 25, 2025 | Sale | −10,000 | $28.86 | $288.60K | 90,956 |
| Mario Max Yzaguirre Director | Aug 23, 2025 | Award | +5,963 | – | – | 8,324 |
| Ray N. Walker JR Director | Aug 23, 2025 | Award | +5,696 | – | – | 62,601 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of float
33.33%
17M shares short
Days to cover
5.9
At 3M shares a day
Change since last report
+1.7%
From 17M shares
Short volume, 20 days
61.4%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of Solaris Energy Infrastructure's stock actually held short. Settlement fails (shares not delivered on time) peaked at 65,956 shares on Sep 3, 2026 over the last 90 days.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Yorktown Energy Partners X, L.P. Affiliate | May 8, 2026 | 2,000,000 | $149.00M | May 6, 2026 | Private Placement |
| KTR Management Company, LLC 10% Stockholder | Nov 6, 2025 | 2,114,783 | $106.06M | Nov 4, 2025 | Contribution/Acquisition |
| KTR Management Company, LLC Owner | Aug 7, 2025 | 4,000,000 | $118.00M | Aug 6, 2025 | Contribution/Acquisition |
| J Turbines, Inc. 10% Owner | Jul 29, 2025 | 4,000,000 | $121.20M | Jul 28, 2025 | Contribution/Acquisition |
| J Turbines, Inc. Officer | Jun 4, 2025 | 150,000 | $4.20M | Jun 4, 2025 | Contribution / Acquisition |
| J Turbines, Inc. 10% Owner | May 7, 2025 | 1,850,000 | $41.48M | May 5, 2025 | Contribution/Acquisition |
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