Position in ERII
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$4,525,820
-$1,120,917 QoQ
Shares Held
449,436
+7.4% QoQ
Ownership
0.872%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
24 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in ERII Over Time
Shares Held
Position Value (USD)
Derivatives in ERII
reported options exposure · as of Mar 31, 2026CallValue
$335,331
CallShares
33,300
PutValue
$0
PutShares
0
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Pollution & Treatment Controls
Industrials · as of Mar 31, 2026CITADEL ADVISORS LLC holds $43,243,660 across 7 Pollution & Treatment Controls names. ERII ranks #4 (10.5% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VLTO |
Veralto Corp
|
185,893 | $16,436,658 | |
| 2 | CECO |
Ceco Environmental Corp
|
217,386 | $12,951,857 | |
| 3 | ZWS |
Zurn Elkay Water Solutions Corp
|
166,123 | $7,448,954 | |
| 4 | ERII |
Energy Recovery, Inc.
This page
|
449,436 | $4,525,820 | |
| 5 | PCT |
PureCycle Technologies, Inc.
|
342,774 | $1,778,996 | |
| 6 | BCHT |
Birchtech Corp.
|
50,994 | $96,888 | |
| 7 | ZONE |
CleanCore Solutions, Inc.
|
12,605 | $4,487 |
All Filings in ERII
Export CSV
50 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $335,331 | 33,300 | Call | Defined | 2026-05-15 | |
| 2026-03-31 | $4,525,820 | 449,436 | Shares | Defined | 2026-05-15 | |
| 2025-12-31 | $5,646,737 | 418,587 | Shares | Defined | 2026-02-17 | |
| 2025-12-31 | $694,735 | 51,500 | Call | Defined | 2026-02-17 | |
| 2025-09-30 | $416,340 | 27,000 | Put | Defined | 2025-11-14 | |
| 2025-09-30 | $686,190 | 44,500 | Call | Defined | 2025-11-14 | |
| 2025-09-30 | $5,116,664 | 331,820 | Shares | Defined | 2025-11-14 | |
| 2025-06-30 | $486,649 | 38,079 | Shares | Defined | 2025-08-14 | |
| 2025-06-30 | $343,782 | 26,900 | Put | Defined | 2025-08-14 | |
| 2025-06-30 | $235,152 | 18,400 | Call | Defined | 2025-08-14 | |
| 2025-03-31 | $4,481,138 | 282,010 | Shares | Defined | 2025-05-15 | |
| 2025-03-31 | $707,105 | 44,500 | Call | Defined | 2025-05-15 | |
| 2025-03-31 | $506,891 | 31,900 | Put | Defined | 2025-05-15 | |
| 2024-12-31 | $183,750 | 12,500 | Put | Defined | 2025-02-14 | |
| 2024-12-31 | $254,310 | 17,300 | Call | Defined | 2025-02-14 | |
| 2024-12-31 | $703,879 | 47,883 | Shares | Defined | 2025-02-14 | |
| 2024-09-30 | $1,955,192 | 112,432 | Shares | Defined | 2024-11-14 | |
| 2024-09-30 | $85,211 | 4,900 | Put | Defined | 2024-11-14 | |
| 2024-09-30 | $386,058 | 22,200 | Call | Defined | 2024-11-14 | |
| 2024-06-30 | $188,718 | 14,200 | Call | Defined | 2024-08-14 | |
| 2024-06-30 | $81,069 | 6,100 | Put | Defined | 2024-08-14 | |
| 2024-06-30 | $2,563,587 | 192,896 | Shares | Defined | 2024-08-14 | |
| 2024-03-31 | $155,925 | 9,875 | Shares | Defined | 2024-05-15 | |
| 2024-03-31 | $126,320 | 8,000 | Put | Defined | 2024-05-15 | |
| 2024-03-31 | $186,322 | 11,800 | Call | Defined | 2024-05-15 | |
| 2023-12-31 | $531,288 | 28,200 | Call | Defined | 2024-02-14 | |
| 2023-12-31 | $658,833 | 34,970 | Shares | Defined | 2024-02-14 | |
| 2023-12-31 | $175,212 | 9,300 | Put | Defined | 2024-02-14 | |
| 2023-09-30 | $161,196 | 7,600 | Put | Defined | 2023-11-14 | |
| 2023-09-30 | $258,762 | 12,200 | Call | Defined | 2023-11-14 | |
| 2023-09-30 | $631,061 | 29,753 | Shares | Defined | 2023-11-14 | |
| 2023-06-30 | $80,999 | 2,898 | Shares | Defined | 2023-08-14 | |
| 2023-06-30 | $100,620 | 3,600 | Put | Defined | 2023-08-14 | |
| 2023-06-30 | $455,585 | 16,300 | Call | Defined | 2023-08-14 | |
| 2023-03-31 | $18,578 | 806 | Shares | Defined | 2023-05-15 | |
| 2023-03-31 | $82,980 | 3,600 | Put | Defined | 2023-05-15 | |
| 2023-03-31 | $140,605 | 6,100 | Call | Defined | 2023-05-15 | |
| 2022-12-31 | $63,519 | 3,100 | Put | Defined | 2023-02-14 | |
| 2022-12-31 | $140,581 | 6,861 | Shares | Defined | 2023-02-14 | |
| 2022-12-31 | $145,479 | 7,100 | Call | Defined | 2023-02-14 | |
| 2022-09-30 | $2,237,915 | 102,940 | Shares | Defined | 2022-11-14 | |
| 2022-09-30 | $402,190 | 18,500 | Call | Defined | 2022-11-14 | |
| 2022-06-30 | $246,226 | 12,679 | Shares | Defined | 2022-08-15 | |
| 2022-03-31 | $444,005 | 22,046 | Shares | Defined | 2022-05-16 | |
| 2021-12-31 | $349,341 | 16,256 | Shares | Defined | 2022-02-14 | |
| 2021-12-31 | $1,048,712 | 48,800 | Call | Defined | 2022-02-14 | |
| 2021-12-31 | $909,027 | 42,300 | Put | Defined | 2022-02-14 | |
| 2021-09-30 | $416,985 | 21,912 | Shares | Defined | 2021-11-15 | |
| 2021-09-30 | $1,136,091 | 59,700 | Call | Defined | 2021-11-15 | |
| 2021-09-30 | $679,371 | 35,700 | Put | Defined | 2021-11-15 | |
| No filing history on record for this holder in this stock. | ||||||