Solaris Energy Infrastructure, Inc.
MX ˙ BMV ˙ US83418M1036
SecurityMX:SEI / Solaris Energy Infrastructure, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership138,229 shares
Latest Disclosed Value $ 6,354,380
Sei Investments Co reports 310.74% increase in ownership of SEI / Solaris Energy Infrastructure, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 138,229 shares of Solaris Energy Infrastructure, Inc. (MX:SEI) valued at $6,354,380 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 33,654 shares of Solaris Energy Infrastructure, Inc.. This represents a change in shares of 310.74% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 138,229 104,575 310.74 6,354 372.42 0.0063
2025-11-13 2025-09-30 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 33,654 -201 -0.59 1,345 40.54 0.0014
2025-08-14 2025-06-30 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 33,855 808 2.45 958 33.10 0.0011
2025-05-14 2025-03-31 13F/A-1 SOLARIS ENERGY INFRAS COM CL A 83418M103 33,047 -2,164 -6.15 719 -29.02 0.0009
2025-05-13 2025-03-31 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 22,215 -12,996 553 0.0006
2025-02-11 2024-12-31 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 35,211 35,211 1,013 0.0013
2024-11-12 2024-09-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 0 -36,233 -100.00 0 -100.00
2024-08-13 2024-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 36,233 0 0.00 311 -1.27 0.0004
2024-05-07 2024-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 36,233 0 0.00 314 9.03 0.0005
2024-02-14 2023-12-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 36,233 -29 -0.08 288 -25.39 0.0005
2023-11-14 2023-09-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 36,262 0 0.00 387 27.81 0.0007
2023-08-11 2023-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 36,262 -10,649 -22.70 302 -24.50 0.0005
2023-05-12 2023-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 46,911 5,898 14.38 401 -1.72 0.0007
2023-02-10 2022-12-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 41,013 3,243 8.59 407 15.30 0.0009
2022-11-14 2022-09-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 37,770 0 0.00 353 -14.11 0.0008
2022-08-15 2022-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 37,770 0 0.00 411 -3.52 0.0009
2022-05-13 2022-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 37,770 -26,122 -40.88 426 1.91 0.0009
2022-02-14 2021-12-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 63,892 0 0.00 418 -21.58 0.0008
2021-11-12 2021-09-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 63,892 16,420 34.59 533 15.37 0.0011
2021-08-06 2021-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 47,472 8,200 20.88 462 -4.15 0.0010
2021-05-12 2021-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 39,272 -14,900 -27.50 482 9.30 0.0012
2021-02-08 2020-12-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 54,172 -9,267 -14.61 441 9.70 0.0011
2020-12-04 2020-09-30 13F/A-1 SOLARIS OILFIELD INFRSTR COM CL A 83418M103 63,439 19,100 43.08 402 22.19 0.0012
2020-11-06 2020-09-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 65,525 21,186 415 999.2277
2020-08-17 2020-06-30 13F/A-1 SOLARIS OILFIELD INFRSTR COM CL A 83418M103 44,339 -4,081 -8.43 329 29.53 0.0010
2020-08-11 2020-06-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 47,182 -1,238 661 1,792.9977
2020-05-14 2020-03-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 48,420 1,238 2.62 254 -61.57 0.0009
2020-02-06 2019-12-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 47,182 2,730 6.14 661 10.72 0.0020
2019-11-12 2019-09-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 44,452 7,795 21.26 597 8.74 0.0015
2019-08-14 2019-06-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 36,657 4,666 14.59 549 4.37 0.0018
2019-05-15 2019-03-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 31,991 20,732 184.14 526 146.95 0.0018
2019-02-13 2018-12-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 11,259 0 0.00 213 0.00 0.0008
2018-11-08 2018-09-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 11,259 2,323 26.00 213 66.41 0.0008
2018-08-03 2018-06-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 8,936 901 11.21 128 -3.76 0.0004
2018-05-11 2018-03-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 8,035 0 0.00 133 -22.67 0.0005
2018-02-08 2017-12-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 8,035 -706 -8.08 172 13.16 0.0006
2017-11-06 2017-09-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 8,741 8,741 152 0.0005
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.