Energy Recovery, Inc.
US ˙ NasdaqGS ˙ US29270J1007

SecurityERII / Energy Recovery, Inc.
InstitutionSelect Equity Group, L.P.
Latest Disclosed Ownership394,208 shares
Latest Disclosed Value $ 3,969,675
Select Equity Group, L.P. reports 49.04% decrease in ownership of ERII / Energy Recovery, Inc.

On May 15, 2026 - Select Equity Group, L.P. filed a 13F-HR form disclosing ownership of 394,208 shares of Energy Recovery, Inc. (US:ERII) valued at $3,969,675 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 773,577 shares of Energy Recovery, Inc.. This represents a change in shares of -49.04% during the quarter. The current value of the position is $3,169,432 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ENERGY RECOVERY COM 29270J100 394,208 -379,369 -49.04 3,970 -61.96 0.0203
2026-02-17 2025-12-31 13F ENERGY RECOVERY COM 29270J100 773,577 22,535 3.00 10,436 -9.90 0.0450
2025-11-14 2025-09-30 13F ENERGY RECOVERY COM 29270J100 751,042 -18,664 -2.42 11,581 17.74 0.0477
2025-08-14 2025-06-30 13F ENERGY RECOVERY COM 29270J100 769,706 102,549 15.37 9,837 -7.22 0.0412
2025-05-15 2025-03-31 13F ENERGY RECOVERY COM 29270J100 667,157 534,662 403.53 10,601 444.48 0.0457
2025-02-14 2024-12-31 13F ENERGY RECOVERY COM 29270J100 132,495 11,351 9.37 1,948 -7.55 0.0077
2024-11-14 2024-09-30 13F ENERGY RECOVERY COM 29270J100 121,144 39,145 47.74 2,107 93.39 0.0076
2024-08-14 2024-06-30 13F ENERGY RECOVERY COM 29270J100 81,999 14,609 21.68 1,090 2.35 0.0043
2024-05-15 2024-03-31 13F ENERGY RECOVERY COM 29270J100 67,390 -7,999 -10.61 1,064 -25.07 0.0038
2024-02-14 2023-12-31 13F ENERGY RECOVERY COM 29270J100 75,389 -45,744 -37.76 1,420 -44.73 0.0051
2023-11-14 2023-09-30 13F ENERGY RECOVERY COM 29270J100 121,133 2,163 1.82 2,569 -22.74 0.0105
2023-08-14 2023-06-30 13F ENERGY RECOVERY COM 29270J100 118,970 13,093 12.37 3,325 36.27 0.0124
2023-05-15 2023-03-31 13F ENERGY RECOVERY COM 29270J100 105,877 29,525 38.67 2,440 56.01 0.0087
2023-02-14 2022-12-31 13F ENERGY RECOVERY COM 29270J100 76,352 -64,210 -45.68 1,564 52,033.33 0.0059
2022-11-14 2022-09-30 13F ENERGY RECOVERY COM 29270J100 140,562 -10,500 -6.95 3 50.00 0.0107
2022-08-15 2022-06-30 13F ENERGY RECOVERY COM 29270J100 151,062 22,263 17.29 3 0.00 0.0094
2022-05-16 2022-03-31 13F ENERGY RECOVERY COM 29270J100 128,799 21,655 20.21 3 0.00 0.0084
2022-02-14 2021-12-31 13F ENERGY RECOVERY COM 29270J100 107,144 4,448 4.33 2 -99.90 0.0063
2021-11-15 2021-09-30 13F ENERGY RECOVERY COM 29270J100 102,696 11,038 12.04 1,954 -6.37 0.0066
2021-08-16 2021-06-30 13F ENERGY RECOVERY COM 29270J100 91,658 34,395 60.06 2,088 98.76 0.0071
2021-05-17 2021-03-31 13F ENERGY RECOVERY COM 29270J100 57,263 28,147 96.67 1,050 164.48 0.0038
2021-02-16 2020-12-31 13F ENERGY RECOVERY COM 29270J100 29,116 14,009 92.73 397 222.76 0.0016
2020-11-16 2020-09-30 13F ENERGY RECOVERY COM 29270J100 15,107 3,431 29.39 124 39.77 0.0006
2020-08-14 2020-06-30 13F ENERGY RECOVERY COM 29270J100 11,676 11,676 89 0.0005
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.