ERII
Energy Recovery Inc
NASDAQ: ERII · INDUSTRIALS · POLLUTION & TREATMENT CONTROLS
$8.73
-3.38% today
Updated 2026-06-05
Market cap
$412.88M
P/E ratio
21.65
P/S ratio
3.02x
EPS (TTM)
$0.37
Dividend yield
—
52W range
$8 – $18
Volume
1.1M
Energy Recovery Inc (ERII) Insider transactions
Net insider activity
Net buying (131,591 shares)
Buy transactions
28
Sell transactions
72
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-13 | TONDREAU, PAMELA L. | Director | Buy | 20,000 | $8.34 | $166840.00 |
| 2026-04-06 | HANSTVEIT, ARVE | Director | Sale | 2,419 | $10.29 | $24891.51 |
| 2026-04-02 | HANSTVEIT, ARVE | Director | Sale | 165,292 | $10.14 | $1.68M |
| 2026-03-10 | HANSTVEIT, ARVE | Director | Sale | 25,000 | $10.96 | $273975.00 |
| 2026-03-06 | HANSTVEIT, ARVE | Director | Sale | 11,582 | $10.62 | $122942.93 |
| 2026-03-05 | RAMANAN, NATARAJAN | Chief Technology Officer | Sale | 272 | $10.57 | $2875.04 |
| 2026-03-05 | HANSTVEIT, ARVE | Director | Sale | 38,418 | $10.71 | $411456.78 |
| 2026-03-04 | CLEMENTE, RODNEY | SVP, Water | Sale | 20,568 | $10.61 | $218308.75 |
| 2026-03-03 | RAMANAN, NATARAJAN | Chief Technology Officer | Sale | 2,724 | $10.22 | $27839.28 |
| 2026-02-17 | YEUNG, WILLIAM | Chief Legal Officer | Buy | 25,959 | — | — |
| 2026-02-17 | RAMANAN, NATARAJAN | Chief Technology Officer | Buy | 29,106 | — | — |
| 2026-02-17 | MOON, DAVID W | Director, President and CEO | Buy | 81,812 | — | — |
| 2026-02-17 | MANCINI, MICHAEL S. | Chief Financial Officer | Buy | 45,626 | — | — |
| 2026-02-17 | HOSTETLER, MATTHEW | Chief Human Resources Officer | Buy | 25,959 | — | — |
| 2026-02-17 | CLEMENTE, RODNEY | SVP, Water | Buy | 45,626 | — | — |
| 2026-02-06 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 646 | $15.14 | $9780.44 |
| 2026-02-05 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 890 | $14.59 | $12985.10 |
| 2026-02-05 | CLEMENTE, RODNEY | SVP, Water | Sale | 724 | $14.59 | $10563.16 |
| 2026-02-02 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 729 | $14.46 | $10541.34 |
| 2026-01-30 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 8,622 | $14.30 | $123294.60 |
| 2026-01-30 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 1,003 | $14.65 | $14693.95 |
| 2026-01-30 | MOON, DAVID W | Director, President and CEO | Sale | 17,160 | $14.30 | $245388.00 |
| 2026-01-30 | MANCINI, MICHAEL S. | Chief Financial Officer | Sale | 4,798 | $14.30 | $68611.40 |
| 2026-01-30 | HOSTETLER, MATTHEW | Chief Human Resources Officer | Sale | 3,359 | $14.30 | $48033.70 |
| 2026-01-30 | CLEMENTE, RODNEY | SVP, Water | Sale | 8,397 | $14.30 | $120077.10 |
| 2026-01-30 | CLEMENTE, RODNEY | SVP, Water | Sale | 694 | $14.65 | $10167.10 |
| 2026-01-28 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 7,271 | $14.55 | $105793.05 |
| 2025-12-05 | HANSTVEIT, ARVE | Director | Sale | 15,000 | $14.71 | $220605.00 |
| 2025-12-04 | HANSTVEIT, ARVE | Director | Sale | 15,000 | $14.97 | $224505.00 |
| 2025-10-24 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 5,638 | $10.19 | $57451.22 |
| 2025-10-24 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 3,530 | $7.50 | $26475.00 |
| 2025-10-24 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 5,638 | $18.00 | $101484.00 |
| 2025-10-24 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 3,530 | $18.00 | $63540.00 |
| 2025-10-23 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 3,530 | $7.50 | $26475.00 |
| 2025-10-23 | YEUNG, WILLIAM | Chief Legal Officer | Buy | 3,530 | $7.50 | $26475.00 |
| 2025-10-20 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 3,530 | $7.50 | $26475.00 |
| 2025-10-20 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 3,530 | $17.00 | $60010.00 |
| 2025-10-16 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 3,530 | $7.50 | $26475.00 |
| 2025-10-16 | YEUNG, WILLIAM | Chief Legal Officer | Buy | 3,530 | $7.50 | $26475.00 |
| 2025-10-03 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 2,529 | $7.50 | $18967.50 |
| 2025-10-03 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 1,038 | $7.50 | $7785.00 |
| 2025-10-03 | YEUNG, WILLIAM | Chief Legal Officer | Buy | 2,529 | $7.50 | $18967.50 |
| 2025-10-03 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 1,038 | $16.00 | $16608.00 |
| 2025-09-18 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 15,454 | $8.95 | $138313.30 |
| 2025-09-18 | YEUNG, WILLIAM | Chief Legal Officer | Buy | 15,454 | $8.95 | $138313.30 |
| 2025-09-11 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 30,877 | $8.95 | $276349.15 |
| 2025-09-11 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 33,554 | $14.51 | $486868.54 |
| 2025-09-11 | YEUNG, WILLIAM | Chief Legal Officer | Buy | 30,877 | $8.95 | $276349.15 |
| 2025-07-28 | CLEMENTE, RODNEY | SVP, Water | Sale | 5,387 | $13.97 | $75256.39 |
| 2025-07-25 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 1,989 | $13.88 | $27607.32 |
| 2025-07-25 | CLEMENTE, RODNEY | SVP, Water | Sale | 2,320 | $13.88 | $32201.60 |
| 2025-06-12 | HANSTVEIT, ARVE | Director | Sale | 30,000 | $12.68 | $380400.00 |
| 2025-06-11 | HANSTVEIT, ARVE | Director | Sale | 20,000 | $12.75 | $255000.00 |
| 2025-06-05 | TONDREAU, PAMELA L. | Director | Buy | 14,847 | — | — |
| 2025-06-05 | SABOL, COLIN R | Director | Buy | 12,038 | — | — |
| 2025-06-05 | HANSTVEIT, ARVE | Director | Buy | 12,038 | — | — |
| 2025-06-05 | CHOW, JOAN KAI | Director | Buy | 12,038 | — | — |
| 2025-06-05 | BUEHLER, ALEXANDER J | Director | Buy | 12,038 | — | — |
| 2025-05-14 | TONDREAU, PAMELA L. | Director | Buy | 4,200 | $12.28 | $51569.70 |
| 2025-05-13 | MOON, DAVID W | Director, President and CEO | Buy | 4,200 | $12.20 | $51240.00 |
| 2025-03-11 | HANSTVEIT, ARVE | Director | Sale | 50,000 | $16.34 | $816950.00 |
| 2025-03-11 | CLEMENTE, RODNEY | SVP, Water | Sale | 1,843 | $16.23 | $29911.89 |
| 2025-03-10 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 944 | $16.37 | $15453.28 |
| 2025-03-10 | CLEMENTE, RODNEY | SVP, Water | Sale | 794 | $16.37 | $12997.78 |
| 2025-03-03 | RAMANAN, NATARAJAN | Chief Technology Officer | Buy | 65,030 | $15.12 | $983253.60 |
| 2025-03-03 | RAMANAN, NATARAJAN | Chief Technology Officer | Buy | 26,455 | — | — |
| 2025-02-20 | CLEMENTE, RODNEY | SVP, Water | Sale | 21,444 | $15.42 | $330709.37 |
| 2025-02-04 | GHASRIPOOR, FARSHAD | Chief Technology Officer | Sale | 65,000 | — | — |
| 2025-02-03 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 882 | $14.34 | $12647.88 |
| 2025-02-03 | GHASRIPOOR, FARSHAD | Chief Technology Officer | Sale | 1,420 | $14.34 | $20362.80 |
| 2025-02-03 | CLEMENTE, RODNEY | SVP, Water | Sale | 944 | $14.34 | $13536.96 |
| 2025-01-31 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 627 | $14.56 | $9129.12 |
| 2025-01-31 | GHASRIPOOR, FARSHAD | Chief Technology Officer | Sale | 926 | $14.56 | $13482.56 |
| 2025-01-31 | CLEMENTE, RODNEY | SVP, Water | Sale | 615 | $14.56 | $8954.40 |
| 2025-01-30 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 698 | $14.33 | $10002.34 |
| 2025-01-30 | GHASRIPOOR, FARSHAD | Chief Technology Officer | Sale | 1,034 | $14.33 | $14817.22 |
| 2025-01-30 | CLEMENTE, RODNEY | SVP, Water | Sale | 694 | $14.33 | $9945.02 |
| 2025-01-27 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 4,061 | $14.40 | $58478.40 |
| 2025-01-27 | MOON, DAVID W | Director, President and CEO | Sale | 7,664 | $14.40 | $110361.60 |
| 2025-01-27 | GHASRIPOOR, FARSHAD | Chief Technology Officer | Sale | 5,721 | $14.40 | $82382.40 |
| 2025-01-27 | CLEMENTE, RODNEY | SVP, Water | Sale | 5,784 | $14.40 | $83289.60 |
| 2025-01-23 | YEUNG, WILLIAM | Chief Legal Officer | Buy | 23,956 | — | — |
| 2025-01-23 | MOON, DAVID W | Director, President and CEO | Buy | 88,980 | — | — |
| 2025-01-23 | MANCINI, MICHAEL S. | Chief Financial Officer | Buy | 34,223 | — | — |
| 2025-01-23 | CLEMENTE, RODNEY | SVP, Water | Buy | 34,223 | — | — |
| 2024-12-11 | HANSTVEIT, ARVE | Director | Sale | 20,000 | $16.87 | $337400.00 |
| 2024-11-11 | CLEMENTE, RODNEY | SVP, Water | Sale | 4,207 | $20.06 | $84392.42 |
| 2024-11-08 | CLEMENTE, RODNEY | SVP, Water | Sale | 3,631 | $20.15 | $73175.54 |
| 2024-11-07 | CLEMENTE, RODNEY | SVP, Water | Sale | 19,618 | $20.00 | $392360.00 |
| 2024-10-28 | MOON, DAVID W | Director, President and CEO | Sale | 2,550 | $17.97 | $45833.70 |
| 2024-10-28 | GHASRIPOOR, FARSHAD | Chief Technology Officer | Sale | 10,526 | $17.97 | $189120.64 |
| 2024-10-28 | CLEMENTE, RODNEY | SVP, Water | Sale | 6,505 | $17.98 | $116946.89 |
| 2024-08-19 | BUEHLER, ALEXANDER J | Director | Sale | 19,841 | $2.92 | $57935.72 |
| 2024-08-19 | BUEHLER, ALEXANDER J | Director | Buy | 19,841 | $2.92 | $57935.72 |
| 2024-08-05 | MOON, DAVID W | Director, President and CEO | Buy | 3,000 | $16.00 | $48009.00 |
| 2024-08-05 | MANCINI, MICHAEL S. | Chief Financial Officer | Buy | 229,322 | $16.03 | $3.68M |
| 2024-07-29 | YEUNG, WILLIAM | Chief Legal Officer | Sale | 2,012 | $14.63 | $29433.55 |
| 2024-07-29 | GHASRIPOOR, FARSHAD | Chief Technology Officer | Sale | 4,079 | $14.63 | $59671.69 |
| 2024-07-29 | CLEMENTE, RODNEY | SVP, Water | Sale | 2,353 | $14.63 | $34422.04 |
| 2024-06-18 | MOON, DAVID W | Director, President and CEO | Sale | 1,219 | $12.77 | $15565.41 |
Frequently asked questions
Are ERII insiders buying or selling?
Over the transactions on record, ERII insiders have been net sellers, with about $9.18M in stock sold across 72 sales, against 12 open-market purchases.
Does insider selling at ERII mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which ERII insiders are selling the most?
Recent selling is concentrated in a few names. HANSTVEIT, ARVE accounts for the largest share on record, with about $4.74M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.