Position in ERII
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$40,592
+$18,076 QoQ
Shares Held
4,031
+184.5% QoQ
Ownership
0.008%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
7 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in ERII Over Time
Shares Held
Position Value (USD)
Position in Pollution & Treatment Controls
Industrials · as of Mar 31, 2026GROUP ONE TRADING LLC holds $150,531 across 7 Pollution & Treatment Controls names. ERII ranks #2 (27.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | FTEK |
Fuel Tech, Inc.
|
40,215 | $49,062 | |
| 2 | ERII |
Energy Recovery, Inc.
This page
|
4,031 | $40,592 | |
| 3 | ADUR |
Aduro Clean Technologies Inc.
|
2,432 | $25,511 | |
| 4 | CECO |
Ceco Environmental Corp
|
361 | $21,508 | |
| 5 | ZWS |
Zurn Elkay Water Solutions Corp
|
308 | $13,810 | |
| 6 | CLIR |
ClearSign Technologies Corp
|
9 | $39 | |
| 7 | LIQT |
Liqtech International Inc
|
5 | $9 |
All Filings in ERII
Export CSV
7 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $40,592 | 4,031 | Shares | Sole | 2026-05-13 | |
| 2025-03-31 | $22,516 | 1,417 | Shares | Sole | 2025-05-14 | |
| 2024-12-31 | $18,963 | 1,290 | Shares | Sole | 2025-05-14 | |
| 2022-09-30 | $116,874 | 5,376 | Shares | Sole | 2022-11-09 | |
| 2021-03-31 | $732,096 | 39,918 | Shares | Sole | 2021-05-12 | |
| 2020-06-30 | $28,150 | 3,704 | Shares | Sole | 2020-08-13 | |
| 2020-03-31 | $86,556 | 11,634 | Shares | Sole | 2020-05-13 | |
| No filing history on record for this holder in this stock. | ||||||