Solaris Energy Infrastructure, Inc.
MX ˙ BMV ˙ US83418M1036
SecurityMX:SEI / Solaris Energy Infrastructure, Inc.
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership1,470,242 shares
Latest Disclosed Value $ 83,083,375
Marshall Wace, Llp reports 75.42% increase in ownership of SEI / Solaris Energy Infrastructure, Inc.

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 1,470,242 shares of Solaris Energy Infrastructure, Inc. (MX:SEI) valued at $83,083,375 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 838,110 shares of Solaris Energy Infrastructure, Inc.. This represents a change in shares of 75.42% 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.

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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)
2026-05-14 2026-03-31 13F SOLARIS ENERGY I COMMON STOCK 83418M103 1,470,242 632,132 75.42 83,083 115.65 0.0392
2026-02-13 2025-12-31 13F SOLARIS ENERGY I COMMON STOCK 83418M103 838,110 305,572 57.38 38,528 81.01 0.0351
2025-11-13 2025-09-30 13F SOLARIS ENERGY I COMMON STOCK 83418M103 532,538 506,415 1,938.58 21,286 2,780.24 0.0216
2025-08-13 2025-06-30 13F SOLARIS ENERGY I COMMON STOCK 83418M103 26,123 -27,160 -50.97 739 -36.24 0.0008
2025-05-15 2025-03-31 13F SOLARIS ENERGY I COMMON STOCK 83418M103 53,283 45,883 620.04 1,159 446.70 0.0015
2025-02-13 2024-12-31 13F SOLARIS ENERGY I COMMON STOCK 83418M103 7,400 -17,220 -69.94 213 -32.48 0.0003
2024-11-14 2024-09-30 13F SOLARIS ENERGY I COMMON STOCK 83418M103 24,620 -7,839 -24.15 314 12.95 0.0004
2024-08-14 2024-06-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 32,459 32,459 278 0.0004
2024-05-15 2024-03-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 0 -39,065 -100.00 0 -100.00
2024-02-14 2023-12-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 39,065 -41,915 -51.76 311 -64.08 0.0005
2023-11-14 2023-09-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 80,980 80,980 863 0.0017
2023-08-14 2023-06-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 0 -24,520 -100.00 0 -100.00
2023-05-15 2023-03-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 24,520 13,120 115.09 209 84.96 0.0004
2023-02-14 2022-12-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 11,400 -8,428 -42.51 113 -38.92 0.0003
2022-11-14 2022-09-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 19,828 19,828 185 0.0004
2022-05-16 2022-03-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 0 -91,507 -100.00 0 -100.00
2022-02-14 2021-12-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 91,507 91,507 599 0.0011
2021-05-17 2021-03-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 0 -210,893 -100.00 0 -100.00
2021-02-16 2020-12-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 210,893 -95,970 -31.27 1,717 -11.77 0.0093
2020-11-16 2020-09-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 306,863 -79,335 -20.54 1,946 -32.10 0.0125
2020-08-13 2020-06-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 386,198 -359,277 -48.19 2,866 -26.78 0.0201
2020-05-15 2020-03-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 745,475 455,397 156.99 3,914 -3.62 0.0391
2020-02-14 2019-12-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 290,078 290,078 4,061 0.0279
2019-11-14 2019-09-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 0 -72,878 -100.00 0 -100.00
2019-08-14 2019-06-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 72,878 -134,363 -64.83 1,092 -67.95 0.0090
2019-05-29 2019-03-31 13F/A-1 SOLARIS OIL IN-A COMMON STOCK 83418M103 207,241 128,281 162.46 3,407 256.75 0.0320
2019-05-14 2019-03-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 207,241 128,281 3,407
2019-02-14 2018-12-31 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 78,960 41,821 112.61 955 36.04 0.0097
2018-12-06 2018-09-30 13F/A-1 SOLARIS OIL IN-A COMMON STOCK 83418M103 37,139 37,139 702 0.0060
2018-11-14 2018-09-30 13F SOLARIS OIL IN-A COMMON STOCK 83418M103 37,139 702
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.