Solaris Energy Infrastructure, Inc. (NYSE: SEI), an SEC filer in Oil & Gas Field Machinery & Equipment, closed at $49.89, -5.6%, on 2026-08-28, with a return on equity of 6.6%, a net margin of 4.8% and 3-year sales growth of 24.8%. Institutional ownership, earnings history and filed financials are on the tabs below.
% of shares outstanding not shown: no SEC cover-page share count falls within 120 days of the 2026-Q1 quarter end, so any percentage would rest on a count that cannot speak for this quarter. Holder share counts are shown as filed.
Crowding percentile lands with its cohort — the cohort is size-matched, so it needs a market cap for SEI in the served universe — that lands with the next screener build.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4,122,4364.1M | $233M | — | TRIM -4% |
| 2 | MILLENNIUM MANAGEMENT LLC | 2,285,5442.3M | $129M | — | ADD 24% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 2,040,4512.0M | $115M | — | NEW |
| 4 | VAN ECK ASSOCIATES CORP | 1,954,4552.0M | $110M | — | ADD 57% |
| 5 | TWO SIGMA INVESTMENTS, LP | 1,941,5461.9M | $110M | — | ADD 80% |
| 6 | FMR LLC | 1,862,5611.9M | $105M | — | TRIM -19% |
| 7 | Encompass Capital Advisors LLC | 1,750,0001.8M | $99M | — | TRIM -32% |
| 8 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 1,729,0551.7M | $98M | — | TRIM -17% |
| 9 | MORGAN STANLEY | 1,707,4551.7M | $96M | — | TRIM -18% |
| 10 | Driehaus Capital Management LLC | 1,628,1741.6M | $92M | — | ADD 33% |
Ranked by each filer’s own reported value, not shares.
1 holder — The filer reported no value for this line, so it carries no dollar figure and is left out of the percentage and value columns.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | +2,040,451 | $115M | OPEN |
| TWO SIGMA INVESTMENTS, LP | +861,615 | $49M | ADD |
| JENNISON ASSOCIATES LLC | +805,319 | $46M | ADD |
| VAN ECK ASSOCIATES CORP | +712,736 | $40M | ADD |
| Korea Investment CORP | +643,414 | $36M | ADD |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD GROUP INC | −2,913,632 | $165M | CLOSE |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | −1,021,000 | $58M | CLOSE |
| Goodlander Investment Management, LLC | −960,000 | $54M | CLOSE |
| Encompass Capital Advisors LLC | −809,543 | $46M | TRIM |
| Situational Awareness LP | −760,949 | $43M | TRIM |
Prior quarter split-rebased · 13Fs are long, US-listed only.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 5.7M | 6.6M | 6.1M | 4.9M | 4.3M | 4.1M | $233M |
| MILLENNIUM MANAGEMENT LLC | 272K | 1.1M | 647K | 802K | 1.8M | 2.3M | $129M |
| VANGUARD CAPITAL MANAGEMENT LLC | — | — | — | — | — | 2.0M | $115M |
| VAN ECK ASSOCIATES CORP | — | — | 179K | 1.3M | 1.2M | 2.0M | $110M |
| TWO SIGMA INVESTMENTS, LP | 212K | 333K | 533K | 1.0M | 1.1M | 1.9M | $110M |
| FMR LLC | 5K | 5K | 1.7M | 2.2M | 2.3M | 1.9M | $105M |
| Encompass Capital Advisors LLC | 2.3M | 3.6M | 3.6M | 2.9M | 2.6M | 1.8M | $99M |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 2.4M | 1.4M | 2.4M | 1.8M | 2.1M | 1.7M | $98M |
| MORGAN STANLEY | 732K | 603K | 1.6M | 1.9M | 2.1M | 1.7M | $96M |
| Driehaus Capital Management LLC | 536K | 2.0M | 2.2M | 962K | 1.2M | 1.6M | $92M |
Green = added, red = trimmed, grey = held; a dash is a quarter with no 13F on file — a gap, not an exit.
Holders only — breaks = no 13F.
Short interest has its own tab now — open SI →
SEC Form 13F · ~10,250 filers, 10y · long-only, US-listed, filed ≤45d after quarter-end.
SEC Schedule 13D/G XML · group aggregate.
