Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value (SEI) Institutional Ownership

13F Institutional Holders and Ownership History from Q2 2017 to Q4 2025

Type / Class
Equity / Class A Common Stock, $0.01 par value
Symbol
SEI on NYSE
Shares outstanding
48,893,412
Price per share
$45.97
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
55,305,273
Total reported value
$2,210,406,155
% of total 13F portfolios
0.01%
Share change
+7,368,432
Value change
+$322,737,215
Number of holders
270
Price from insider filings
$45.97
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value (SEI) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Yorktown Energy Partners X, L.P. 16% $162,043,666 7,079,234 Yorktown Energy Partners X, L.P. 31 Dec 2024
Zartler William A 12% $116,859,813 5,105,278 William A. Zartler 31 Dec 2024
Solaris Energy Capital, LLC 8.5% $80,423,923 3,513,496 Solaris Energy Capital, LLC 31 Dec 2024
Encompass Capital Advisors LLC 6.6% -30% $116,695,852 -$28,354,358 2,919,586 -20% Encompass Capital Advisors LLC 30 Sep 2025
JANE STREET GROUP, LLC 5.1% $106,799,346 2,493,564 JANE STREET GROUP, LLC 01 Dec 2025
VANGUARD GROUP INC 6% +45% $55,309,638 +$18,799,167 2,440,849 +51% The Vanguard Group 30 Jun 2025
FMR LLC 5.2% $92,725,827 2,319,886 FMR LLC 30 Sep 2025
BlackRock Portfolio Management LLC 4.9% -40% $86,965,247 -$50,313,357 2,175,763 -37% BlackRock Portfolio Management LLC 30 Sep 2025
J Turbines, Inc. 3.1% -79% $47,920,983 -$94,039,000 2,114,783 -66% J Turbines, Inc. 28 Jul 2025
BlackRock, Inc. 5.6% -65% $47,281,721 -$82,812,907 2,065,606 -64% BlackRock, Inc. 31 Jan 2025
KTR Management Company, LLC 3.9% -36% $79,940,000 -$84,527,877 2,000,000 -51% KTR Management Company, LLC 04 Nov 2025
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 4% -24% $71,798,511 -$7,575,674 1,796,310 -9.5% Summit Partners Public Asset Management, LLC 30 Sep 2025
DRIEHAUS CAPITAL MANAGEMENT LLC 2.2% -63% $38,433,034 -$42,522,884 961,547 -53% DRIEHAUS CAPITAL MANAGEMENT LLC 30 Sep 2025
DIMENSIONAL FUND ADVISORS LP 2.3% $19,833,956 866,490 Dimensional Fund Advisors LP 31 Dec 2024
MILLENNIUM MANAGEMENT LLC 1.6% -68% $14,669,246 -$31,406,556 647,363 -68% Millennium Management LLC 30 Jun 2025
T. Rowe Price Investment Management, Inc. 1% -81% $8,684,443 -$48,269,150 379,399 -85% T. Rowe Price Investment Management, Inc. 31 Mar 2025

As of 30 Sep 2025, 270 institutional investors reported holding 55,305,273 shares of Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value (SEI). This represents 113% of the company’s total 48,893,412 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value (SEI) together control 73% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
BlackRock, Inc. 9.9% 4,852,484 -21% 0% $193,953,789
Encompass Capital Advisors LLC 6% 2,919,586 -20% 5.3% $116,695,852
VANGUARD GROUP INC 5.5% 2,664,870 +9.2% 0% $106,514,854
FMR LLC 4.6% 2,237,437 +35% 0% $89,430,356
MORGAN STANLEY 3.9% 1,891,539 +19% 0% $75,604,856
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 3.7% 1,796,310 -25% 2.3% $71,798,511
GOLDMAN SACHS GROUP INC 3.5% 1,696,481 +101% 0.01% $67,808,354
VAN ECK ASSOCIATES CORP 2.7% 1,295,898 +624% 0.05% $51,797,000
WELLINGTON MANAGEMENT GROUP LLP 2.5% 1,222,542 -2.4% 0.01% $48,865,004
GW&K Investment Management, LLC 2.4% 1,177,830 +13% 0.42% $47,078,000
Situational Awareness LP 2.4% 1,150,300 2.1% $45,977,491
Point72 Asset Management, L.P. 2.2% 1,097,575 +530% 0.1% $43,870,039
JANE STREET GROUP, LLC 2.1% 1,044,042 0.05% $41,730,359
STATE STREET CORP 2.1% 1,043,621 +13% 0% $41,713,531
TWO SIGMA INVESTMENTS, LP 2.1% 1,007,320 +89% 0.06% $40,262,580
Advent International, L.P. 2.1% 1,006,900 0.81% $40,245,793
BRIGHTLINE CAPITAL MANAGEMENT, LLC 2.1% 1,003,000 -11% 16% $40,089,910
Driehaus Capital Management LLC 2% 961,547 -57% 0.28% $38,433,034
GEODE CAPITAL MANAGEMENT, LLC 1.9% 911,202 +5.5% 0% $36,426,455
Ceredex Value Advisors LLC 1.8% 876,900 0.81% $35,049,694
WESTWOOD HOLDINGS GROUP INC 1.8% 861,121 -43% 0.25% $34,419,000
MILLENNIUM MANAGEMENT LLC 1.6% 802,148 +24% 0.03% $32,061,856
SIR Capital Management, L.P. 1.6% 763,894 -26% 2.7% $30,532,843
PRICE T ROWE ASSOCIATES INC /MD/ 1.5% 728,373 +3274% 0% $29,114,000
Goodlander Investment Management, LLC 1.3% 650,000 -7.1% 9.9% $25,980,500

Institutional Holders of Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value (SEI) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 455,322 $20,979,505 +$1,144,791 $45.97 10
2025 Q3 55,305,273 $2,210,406,155 +$322,737,215 $39.97 270
2025 Q2 47,822,065 $1,352,942,005 +$209,556,304 $28.29 210
2025 Q1 40,959,060 $891,388,765 +$125,489,883 $21.76 199
2024 Q4 35,026,280 $1,008,015,163 +$330,954,639 $28.78 176
2024 Q3 23,891,385 $304,882,213 +$21,557,065 $12.76 132
2024 Q2 23,566,847 $202,202,956 -$10,503,129 $8.58 125
2024 Q1 24,776,940 $214,813,753 +$334,569 $8.67 131
2023 Q4 50,087 $398,693 +$168,696 $7.96 2
2023 Q3 20,826,944 $222,051,273 -$4,649,448 $10.66 115
2023 Q2 21,865,662 $182,138,734 -$9,894,747 $8.33 99
2023 Q1 22,784,805 $194,498,634 -$8,814,245 $8.54 115
2022 Q4 24,110,785 $239,417,892 +$1,392,465 $9.93 123
2022 Q3 24,002,385 $224,657,248 -$6,295,169 $9.36 122
2022 Q2 24,511,101 $267,404,973 +$26,464,787 $10.88 128
2022 Q1 25,512,174 $287,543,035 +$27,913,955 $11.29 119
2021 Q4 23,934,603 $156,730,942 -$9,621,210 $6.55 103
2021 Q3 22,000,000 $183,339,705 -$7,676,099 $8.34 104
2021 Q2 23,235,974 $226,483,516 -$1,492,926 $9.74 110
2021 Q1 22,826,156 $280,104,714 -$11,228,922 $12.27 111
2020 Q4 24,265,298 $198,323,824 +$7,497,685 $8.14 104
2020 Q3 23,045,511 $146,354,939 -$12,551,337 $6.34 103
2020 Q2 24,652,334 $182,694,094 -$12,165,315 $7.42 115
2020 Q1 26,725,897 $140,217,139 -$42,093,621 $5.25 114
2019 Q4 31,811,690 $445,369,684 +$5,759,454 $14.00 133
2019 Q3 31,405,678 $421,571,375 -$6,188,066 $13.42 120
2019 Q2 31,740,761 $475,420,506 +$24,536,166 $14.98 134
2019 Q1 29,990,199 $493,318,281 +$14,726,998 $16.44 113
2018 Q4 29,210,038 $353,140,534 -$180,730,255 $12.09 102
2018 Q3 36,419,586 $687,949,737 +$18,628,343 $18.89 105
2018 Q2 36,491,754 $521,298,878 +$20,990,829 $14.29 117
2018 Q1 34,777,544 $575,921,448 +$83,458,257 $16.56 116
2017 Q4 29,647,208 $634,773,241 +$109,324,931 $21.41 99
2017 Q3 24,508,328 $426,586,823 -$4,484,905 $17.43 66
2017 Q2 25,233,780 $290,940,222 +$290,940,319 $11.53 51