Solaris Energy Infrastructure, Inc.
MX ˙ BMV ˙ US83418M1036
SecurityMX:SEI / Solaris Energy Infrastructure, Inc.
InstitutionMillennium Management Llc
ManagerIsrael Englander
Latest Disclosed Ownership647,363 shares
Ownership 1.60%
Millennium Management Llc ownership in SEI / Solaris Energy Infrastructure, Inc.

2025-07-21 - Millennium Management Llc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 647,363 shares of Solaris Energy Infrastructure, Inc. (MX:SEI). This represents 1.6 percent ownership of the company. In their previous filing dated 2025-05-15 , Millennium Management Llc had reported owning 2,033,354 shares, indicating a decrease of -68.16 percent.

Millennium Management Llc has a history of taking positions in derivatives of the underlying security (SEI) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date
Effective
Date
Form Prev
Shares
Latest
Shares
ΔShares
(Percent)
Ownership
(Percent)
ΔOwnership
(Percent)
2025-07-21 2025-07-21 13G/A 2,033,354 647,363 -68.16 1.60 -68.00
2025-05-15 2025-05-15 13G 2,007,438 2,033,354 1.29 5.00 0.60
2025-05-08 2025-05-08 13G 2,007,438 4.97

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:SEI / Solaris Energy Infrastructure, Inc. Historical Put/Call Ratio
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)
2026-05-15 2026-03-31 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 2,285,544 440,494 23.87 129,156 52.28 0.0537
2026-02-17 2025-12-31 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 1,845,050 1,042,902 130.01 84,817 164.55 0.0357
2025-11-14 2025-09-30 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 802,148 155,385 24.03 32,062 75.24 0.0137
2025-08-14 2025-06-30 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 646,763 -471,562 -42.17 18,297 -24.81 0.0088
2025-05-15 2025-03-31 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 1,118,325 846,734 311.77 24,335 211.34 0.0130
2025-02-14 2024-12-31 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 271,591 182,585 205.14 7,816 588.63 0.0038
2024-11-14 2024-09-30 13F SOLARIS ENERGY INFRAS COM CL A 83418M103 89,006 -508,888 -85.11 1,136 -77.87 0.0005
2024-08-14 2024-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 597,894 -223,588 -27.22 5,130 -27.98 0.0024
2024-05-15 2024-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 821,482 617,937 303.59 7,122 339.63 0.0030
2024-02-14 2023-12-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 203,545 90,712 80.39 1,620 34.78 0.0007
2023-11-14 2023-09-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 112,833 112,833 1,203 0.0006
2023-08-14 2023-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 0 -64,761 -100.00 0 -100.00
2023-05-15 2023-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 64,761 -105,831 -62.04 553 -67.36 0.0003
2023-02-14 2022-12-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 170,592 -562,418 -76.73 1,694 -75.31 0.0009
2022-11-14 2022-09-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 733,010 169,080 29.98 6,861 11.82 0.0041
2022-08-15 2022-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 563,930 330,484 141.57 6,136 132.78 0.0038
2022-05-16 2022-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 233,446 185,978 391.80 2,636 747.59 0.0014
2022-02-14 2021-12-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 47,468 47,468 311 0.0002
2021-11-15 2021-09-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 0 -203,159 -100.00 0 -100.00
2021-08-16 2021-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A 83418M103 203,159 203,159 1,979 0.0012
2020-08-14 2020-06-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 0 -10,945 -100.00 0 -100.00
2020-05-14 2020-03-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 10,945 -442,413 -97.59 57 -99.10 0.0001
2020-02-14 2019-12-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 453,358 -479,439 -51.40 6,347 -49.30 0.0079
2019-11-14 2019-09-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 932,797 438,616 88.76 12,518 69.09 0.0198
2019-08-15 2019-06-30 13F/A-1 SOLARIS OILFIELD INFRSTR COM CL A 83418M103 494,181 337,431 215.27 7,403 187.27 0.0111
2019-08-14 2019-06-30 13F CALAVO GROWERS COM 83418M103 9,126 -147,624 883
2019-05-14 2019-03-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 156,750 141,650 938.08 2,577 1,308.20 0.0039
2019-02-15 2018-12-31 13F/A-1 SOLARIS OILFIELD INFRSTR COM CL A 83418M103 15,100 -119,051 -88.74 183 -92.78 0.0003
2019-02-14 2018-12-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 15,100 183
2018-11-14 2018-09-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 134,151 -108,046 -44.61 2,534 -26.78 0.0031
2018-08-14 2018-06-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 242,197 913 0.38 3,461 -13.39 0.0045
2018-05-15 2018-03-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 241,284 180,387 296.22 3,996 206.44 0.0053
2018-02-14 2017-12-31 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 60,897 22,823 59.94 1,304 96.39 0.0018
2017-11-14 2017-09-30 13F SOLARIS OILFIELD INFRSTR COM CL A 83418M103 38,074 38,074 664 0.0010
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-08-15 2022-06-30 13F SOLARIS OILFIELD INFRASTRUCT COM CL A Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-05-16 2022-03-31 13F SOLARIS OILFIELD INFRASTRUCT COM CL A Call 15,800 178 n/a n/a n/a
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.