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 Q3 2026?

246 institutional investors reported SEI - Solaris Energy Infrastructure, Inc. - Class A Common Stock, $0.01 par value for Q3 2026. Use the holders table for investor-level position and value details.

CUSIP: 83418M103

Q3 2026 13F Holders as of 30 Sep 2026

Security type / class: Equity / Class A Common Stock, $0.01 par value
Total 13F shares: 31,724,689
Total 13F value: $2,252,994,391
Share change: +3,479,145
SEC-reported price per share: $71.18
Number of holders: 246
Value change: +$231,710,595
Number of buys: 155
Number of sells: 108
Shares outstanding: 69,522,651

Security key

83418M103

Report period

Q3 2026

Institutions

246

Top holders

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

Broader feeds

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

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

BlackRock, Inc.

Disclosed value leader

BlackRock, Inc.

Comparable rows

15/15

Latest evidence

30 Sep 2026

13D/G 13F 3/4/5 Lead comparable stake: 13% 13D/G row: BlackRock, Inc. Showing 1-6 of 15 holder rows.

Quick read

BlackRock, Inc. leads the comparable SEC ownership view at 13%.

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 BlackRock, Inc.'s linked filing trail.

Comparable ownership Top 5

BlackRock, Inc. 13%

William A. Zartler 10%

Solaris Energy Capital, LLC 8.5%

Yorktown Energy Partners X, L.P. 7.2%

VANGUARD GROUP INC 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
BlackRock, Inc.	13D/G 13F Company 13D/G 13F	13% Reported 13D/G · 31 Jul 2026	$538,868,745 8,024,851 shares	+$262,700,805	31 Jul 2026
William A. Zartler	3/4/5 13D/G Chairman and Co-CEO, Director, 10%+ Owner 3/4/5 13D/G	10% Reported 13D/G · 31 Dec 2025	$403,603,629 14,035,828 shares mixed-class rows	—	01 Mar 2026
Solaris Energy Capital, LLC	13D/G 13D/G	8.5% Reported 13D/G · 31 Dec 2024	$72,834,772 3,513,496 shares	$0	31 Dec 2024
Yorktown Energy Partners X, L.P.	13D/G 3/4/5 10%+ Owner 13D/G 3/4/5	7.2% Reported 13D/G · 06 May 2026	$341,070,563 5,079,234 shares	-$134,300,000	06 May 2026
VANGUARD GROUP INC	13D/G The Vanguard Group 13D/G	6% Reported 13D/G · 30 Jun 2025	$69,051,618 2,440,849 shares	+$23,469,922	30 Jun 2025
BlackRock Portfolio Management LLC	13D/G 13D/G	4.9% Reported 13D/G · 30 Sep 2025	$86,965,247 2,175,763 shares	-$50,313,357	30 Sep 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 Q3 2026

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

Institutions

246

31,724,689

Rows available

246

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 Q3 2026 vs Q2 2026 Across Filers

Q2 2026 holders

433

Q3 2026 holders

246

Holder diff

-187

Investor	Q2 2026 Shares	Q3 2026 Shares	Share Diff	Share Chg %	Q2 2026 value	Q3 2026 value	Value change	Value Chg %