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

Q: What does CUSIP 83418M103 represent in this 13F holders report?

CUSIP 83418M103 is the security identifier for SEI - Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value used to aggregate holder disclosures.

Q: How many institutions held SEI - Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value in Q1 2026?

359 institutional investors reported SEI - Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: 83418M103

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Class A Common Stock, $0.01 par value
Total 13F shares: 65,117,324
Total 13F value: $3,679,122,136
Share change: -3,627,610
Put/Call ratio: 85%
SEC-reported price per share: $56.51
Number of holders: 359
Value change: -$146,012,279
Number of buys: 205
Number of sells: 170
Shares outstanding: 58,139,535

Security key

83418M103

Report period

Q1 2026

Institutions

359

Top holders

SEI full security history Ownership snapshot Full 13F holder table Previous quarter: Q4 2025 Solaris Energy Infrastructure, Inc. SEC filings Solaris Energy Infrastructure, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 83418M103

Previous quarter: Q4 2025

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024

Ownership snapshot

Top reported holders of SEI - Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Yorktown Energy Partners ...

Disclosed value leader

William A. Zartler

Comparable rows

15/15

Latest evidence

31 Mar 2026

3/4/5 13D/G 13F Lead comparable stake: 16% 13D/G row: Yorktown Energy Partners X, L.P. Showing 1-6 of 15 holder rows.

Quick read

Yorktown Energy Partners X, L.P. leads the comparable SEC ownership view at 16%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Yorktown Energy Partners X, L.P.'s linked filing trail.

Comparable ownership Top 5

Yorktown Energy Partners X, L.P. 16%

William A. Zartler 10%

Solaris Energy Capital, LLC 8.5%

VANGUARD GROUP INC 6%

BlackRock, Inc. 5.6%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Yorktown Energy Partners X, L.P.	3/4/5 13D/G 10%+ Owner 3/4/5 13D/G	16% from 13D/G	$169,954,710 14,158,468 shares mixed-class rows	—	16 Dec 2024
William A. Zartler	3/4/5 13D/G Chairman and Co-CEO, Director, 10%+ Owner 3/4/5 13D/G	10% from 13D/G	$403,603,629 14,035,828 shares mixed-class rows	+$248,300	01 Mar 2026
Solaris Energy Capital, LLC	13D/G 13D/G	8.5%	$72,834,772 3,513,496 shares	$0	31 Dec 2024
VANGUARD GROUP INC	13F 13D/G Company · The Vanguard Group 13F 13D/G	6% from 13D/G	$133,939,663 2,913,632 shares	—	31 Dec 2025
BlackRock, Inc.	13F 13D/G Company 13F 13D/G	5.6% from 13D/G	$198,221,180 4,311,968 shares	—	31 Dec 2025
Voya Financial, Inc.	13D/G 13D/G	5.2%	$134,371,494 2,545,879 shares	$0	31 Dec 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

359

65,117,324

Rows available

359

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

335

Q1 2026 holders

359

Holder diff

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 value	Q1 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend