Energy Recovery, Inc. (ERII) · Insider trading
What Energy Recovery's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$266,078
2 insiders, 2 trades
Sold, 12 months
$3.81M
5 insiders, 17% under a plan
Net, 12 months
−$3.54M
bought less sold
Latest filing
2026-07-29
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Hanstveit ArveDirector | – | $4.74M | 11 | 2026-04-06 | 382,509 |
| Clemente RodneySVP, Water | – | $1.38M | 10 | 2026-07-28 | 108,301 |
| Yeung WilliamChief Legal Officer | – | $1.28M | 14 | 2026-07-28 | 99,291 |
| Tondreau Pamela L.Director | $218,376 | – | 2 | 2026-05-13 | – |
| Ghasripoor FarshadChief Technology Officer | – | $189,152 | 1 | 2024-10-28 | 126,961 |
| Buehler Alexander JDirector, Interim President and CEO | – | $129,779 | 1 | 2026-06-15 | 66,755 |
| Sabol Colin RDirector | $99,278 | – | 1 | 2026-06-15 | 55,671 |
| Moon David WDirector, President and CEO | $51,240 | $45,824 | 2 | 2025-05-13 | – |
| Ramanan NatarajanChief Technology Officer | – | $2,875 | 1 | 2026-03-05 | 52,565 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-07-28 | Yeung WilliamChief Legal Officer | Sale | 2,048 | 8.56 | $17,531 | 99,291 | Form 4 |
| 2026-07-28 | Clemente RodneySVP, Water | Sale | 5,387 | 8.56 | $46,113 | 108,301 | Form 4 |
| 2026-06-15 | Buehler Alexander JDirector, Interim President and CEO | Sale | 14,900 | 8.71 | $129,779 | 66,755 | Form 4 |
| 2026-06-15 | Sabol Colin RDirector | Buy | 11,180 | 8.88 | $99,278 | 55,671 | Form 4 |
| 2026-05-13 | Tondreau Pamela L.Director | Buyindirect | 20,000 | 8.34 | $166,800 | 37,362 | Form 4 |
| 2026-04-06 | Hanstveit ArveDirector | Sale | 2,419 | 10.29 | $24,892 | 382,509 | Form 4 |
| 2026-04-02 | Hanstveit ArveDirector | Sale | 165,292 | 10.14 | $1.68M | 384,928 | Form 4 |
| 2026-03-10 | Hanstveit ArveDirector | Sale | 25,000 | 10.96 | $274,000 | 550,220 | Form 4 |
| 2026-03-06 | Hanstveit ArveDirector | Sale | 11,582 | 10.62 | $123,001 | 575,220 | Form 4 |
| 2026-03-05 | Hanstveit ArveDirector | Sale | 38,418 | 10.71 | $411,457 | 586,802 | Form 4 |
| 2026-03-05 | Ramanan NatarajanChief Technology Officer | Sale | 272 | 10.57 | $2,875 | 52,565 | Form 4 |
| 2026-03-04 | Clemente RodneySVP, Water | Saleplan | 20,568 | 10.61 | $218,226 | 116,008 | Form 4 |
| 2026-02-06 | Yeung WilliamChief Legal Officer | Saleplan | 646 | 15.14 | $9,780 | 78,208 | Form 4 |
| 2026-02-05 | Clemente RodneySVP, Water | Saleplan | 724 | 14.59 | $10,563 | 90,950 | Form 4 |
| 2026-02-05 | Yeung WilliamChief Legal Officer | Saleplan | 890 | 14.59 | $12,985 | 78,854 | Form 4 |
| 2026-02-02 | Yeung WilliamChief Legal Officer | Saleplan | 729 | 14.46 | $10,541 | 79,744 | Form 4 |
| 2026-01-28 | Yeung WilliamChief Legal Officer | Saleplan | 7,271 | 14.55 | $105,793 | 90,098 | Form 4 |
| 2025-12-05 | Hanstveit ArveDirector | Sale | 15,000 | 14.71 | $220,650 | 625,220 | Form 4 |
| 2025-12-04 | Hanstveit ArveDirector | Sale | 15,000 | 14.97 | $224,550 | 640,220 | Form 4 |
| 2025-10-24 | Yeung WilliamChief Legal Officer | Saleplan | 5,638 | 18.00 | $101,484 | 97,369 | Form 4 |
| 2025-10-24 | Yeung WilliamChief Legal Officer | Saleplan | 3,530 | 18.00 | $63,540 | 97,369 | Form 4 |
| 2025-10-23 | Yeung WilliamChief Legal Officer | Saleplan | 3,530 | 17.50 | $61,775 | 97,369 | Form 4 |
| 2025-10-20 | Yeung WilliamChief Legal Officer | Saleplan | 3,530 | 17.00 | $60,010 | 97,369 | Form 4 |
| 2025-10-16 | Yeung WilliamChief Legal Officer | Saleplan | 3,530 | 16.50 | $58,245 | 97,369 | Form 4 |
| 2025-10-03 | Yeung WilliamChief Legal Officer | Saleplan | 1,038 | 16.00 | $16,608 | 97,369 | Form 4 |
| 2025-10-03 | Yeung WilliamChief Legal Officer | Saleplan | 2,529 | 16.00 | $40,464 | 97,369 | Form 4 |
| 2025-09-18 | Yeung WilliamChief Legal Officer | Saleplan | 15,454 | 15.09 | $233,201 | 97,369 | Form 4 |
| 2025-09-11 | Yeung WilliamChief Legal Officer | Saleplan | 33,554 | 14.51 | $486,869 | 97,369 | Form 4 |
| 2025-07-28 | Clemente RodneySVP, Water | Saleplan | 5,387 | 13.97 | $75,256 | 100,765 | Form 4 |
| 2025-06-12 | Hanstveit ArveDirector | Sale | 30,000 | 12.68 | $380,400 | 655,220 | Form 4 |
| 2025-06-11 | Hanstveit ArveDirector | Sale | 20,000 | 12.75 | $255,000 | 685,220 | Form 4 |
| 2025-05-14 | Tondreau Pamela L.Director | Buy | 4,200 | 12.28 | $51,576 | 41,043 | Form 4 |
| 2025-05-13 | Moon David WDirector, President and CEO | Buyindirect | 4,200 | 12.20 | $51,240 | 36,950 | Form 4 |
| 2025-03-11 | Hanstveit ArveDirector | Sale | 50,000 | 16.34 | $817,000 | 693,182 | Form 4 |
| 2025-03-11 | Clemente RodneySVP, Water | Saleplan | 1,843 | 16.23 | $29,912 | 108,472 | Form 4 |
| 2025-02-20 | Clemente RodneySVP, Water | Saleplan | 21,444 | 15.42 | $330,666 | 111,109 | Form 4 |
| 2024-12-11 | Hanstveit ArveDirector | Sale | 20,000 | 16.87 | $337,400 | 743,182 | Form 4 |
| 2024-11-11 | Clemente RodneySVP, Water | Saleplan | 4,207 | 20.06 | $84,392 | 106,367 | Form 4 |
| 2024-11-08 | Clemente RodneySVP, Water | Saleplan | 3,631 | 20.15 | $73,165 | 110,574 | Form 4 |
| 2024-11-07 | Clemente RodneySVP, Water | Saleplan | 19,618 | 20.00 | $392,360 | 114,205 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
27 × shares withheld for tax22 × grant or award10 × option exercise2 × other
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-07-27 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −2,828 | 8.42 | 101,339 | Form 4 |
| 2026-07-27 | Clemente RodneySVP, Water | Shares withheld for tax F | −2,320 | 8.42 | 113,688 | Form 4 |
| 2026-07-09 | Mitchell John JosephDirector | Grant or award A | +16,797 | – | 16,797 | Form 4 |
| 2026-06-15 | Buehler Alexander JDirector, Interim President and CEO | Option exercise M | +15,327 | 8.60 | 81,655 | Form 4 |
| 2026-06-04 | Chow Joan KaiDirector | Grant or award A | +18,094 | 8.29 | 52,116 | Form 4 |
| 2026-06-04 | Sabol Colin RDirector | Grant or award A | +18,094 | 8.29 | 44,491 | Form 4 |
| 2026-06-04 | Hanstveit ArveDirector | Grant or award A | +18,094 | 8.29 | 400,603 | Form 4 |
| 2026-06-04 | Tondreau Pamela L.Director | Grant or award A | +22,316 | 8.29 | 60,844 | Form 4 |
| 2026-05-06 | Ryan AidanInterim CFO | Grant or award A | +18,518 | 11.61 | 34,133 | Form 4 |
| 2026-03-03 | Ramanan NatarajanChief Technology Officer | Shares withheld for tax F | −2,724 | 10.22 | 52,837 | Form 4 |
| 2026-02-17 | Moon David WDirector, President and CEO | Grant or award A | +81,812 | – | 233,069 | Form 4 |
| 2026-02-17 | Ramanan NatarajanChief Technology Officer | Grant or award A | +29,106 | – | 55,561 | Form 4 |
| 2026-02-17 | Clemente RodneySVP, Water | Grant or award A | +45,626 | – | 136,576 | Form 4 |
| 2026-02-17 | Yeung WilliamChief Legal Officer | Grant or award A | +25,959 | – | 104,167 | Form 4 |
| 2026-02-17 | Mancini Michael S.Chief Financial Officer | Grant or award A | +45,626 | – | 75,051 | Form 4 |
| 2026-02-17 | Hostetler MatthewChief Human Resources Officer | Grant or award A | +25,959 | – | 46,556 | Form 4 |
| 2026-01-30 | Moon David WDirector, President and CEO | Shares withheld for tax F | −17,160 | 14.30 | 151,257 | Form 4 |
| 2026-01-30 | Mancini Michael S.Chief Financial Officer | Shares withheld for tax F | −4,798 | 14.30 | 29,425 | Form 4 |
| 2026-01-30 | Hostetler MatthewChief Human Resources Officer | Shares withheld for tax F | −3,359 | 14.30 | 20,597 | Form 4 |
| 2026-01-30 | Clemente RodneySVP, Water | Shares withheld for tax F | −694 | 14.65 | 100,071 | Form 4 |
| 2026-01-30 | Clemente RodneySVP, Water | Shares withheld for tax F | −8,397 | 14.30 | 91,674 | Form 4 |
| 2026-01-30 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −1,003 | 14.65 | 89,095 | Form 4 |
| 2026-01-30 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −8,622 | 14.30 | 80,473 | Form 4 |
| 2025-10-24 | Yeung WilliamChief Legal Officer | Option exercise M | +5,638 | 10.19 | 103,007 | Form 4 |
| 2025-10-24 | Yeung WilliamChief Legal Officer | Option exercise M | +3,530 | 7.50 | 100,899 | Form 4 |
| 2025-10-23 | Yeung WilliamChief Legal Officer | Option exercise M | +3,530 | 7.50 | 100,899 | Form 4 |
| 2025-10-20 | Yeung WilliamChief Legal Officer | Option exercise M | +3,530 | 7.50 | 100,899 | Form 4 |
| 2025-10-16 | Yeung WilliamChief Legal Officer | Option exercise M | +3,530 | 7.50 | 100,899 | Form 4 |
| 2025-10-03 | Yeung WilliamChief Legal Officer | Option exercise M | +1,038 | 7.50 | 98,407 | Form 4 |
| 2025-10-03 | Yeung WilliamChief Legal Officer | Option exercise M | +2,529 | 7.50 | 99,898 | Form 4 |
| 2025-09-18 | Yeung WilliamChief Legal Officer | Option exercise M | +15,454 | 8.95 | 112,823 | Form 4 |
| 2025-09-11 | Yeung WilliamChief Legal Officer | Option exercise M | +30,877 | 8.95 | 130,923 | Form 4 |
| 2025-07-25 | Clemente RodneySVP, Water | Shares withheld for tax F | −2,320 | 13.88 | 106,152 | Form 4 |
| 2025-07-25 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −1,989 | 13.88 | 100,046 | Form 4 |
| 2025-06-05 | Sabol Colin RDirector | Grant or award A | +12,038 | – | 26,397 | Form 4 |
| 2025-06-05 | Hanstveit ArveDirector | Grant or award A | +12,038 | – | 705,220 | Form 4 |
| 2025-06-05 | Chow Joan KaiDirector | Grant or award A | +12,038 | – | 34,022 | Form 4 |
| 2025-06-05 | Buehler Alexander JDirector | Grant or award A | +12,038 | – | 66,328 | Form 4 |
| 2025-06-05 | Tondreau Pamela L.Director | Grant or award A | +14,847 | – | 55,890 | Form 4 |
| 2025-03-10 | Clemente RodneySVP, Water | Shares withheld for tax F | −794 | 16.37 | 110,315 | Form 4 |
| 2025-03-10 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −944 | 16.37 | 102,035 | Form 4 |
| 2025-03-03 | Ramanan NatarajanChief Technology Officer | Grant or award A | +26,455 | – | 26,455 | Form 4 |
| 2025-02-04 | Ghasripoor FarshadChief Technology Officer | Other J | −65,000 | – | 52,860 | Form 4 |
| 2025-02-04 | Ghasripoor FarshadChief Technology Officer | Other J | +65,000 | – | 70,230 | Form 4 |
| 2025-02-03 | Ghasripoor FarshadChief Technology Officer | Shares withheld for tax F | −1,420 | 14.34 | 117,860 | Form 4 |
| 2025-02-03 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −882 | 14.34 | 102,979 | Form 4 |
| 2025-02-03 | Clemente RodneySVP, Water | Shares withheld for tax F | −944 | 14.34 | 132,553 | Form 4 |
| 2025-01-31 | Clemente RodneySVP, Water | Shares withheld for tax F | −615 | 14.56 | 133,497 | Form 4 |
| 2025-01-31 | Ghasripoor FarshadChief Technology Officer | Shares withheld for tax F | −926 | 14.56 | 119,280 | Form 4 |
| 2025-01-31 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −627 | 14.56 | 103,861 | Form 4 |
| 2025-01-30 | Clemente RodneySVP, Water | Shares withheld for tax F | −694 | 14.33 | 134,112 | Form 4 |
| 2025-01-30 | Ghasripoor FarshadChief Technology Officer | Shares withheld for tax F | −1,034 | 14.33 | 120,206 | Form 4 |
| 2025-01-30 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −698 | 14.33 | 104,488 | Form 4 |
| 2025-01-27 | Clemente RodneySVP, Water | Shares withheld for tax F | −5,784 | 14.40 | 134,806 | Form 4 |
| 2025-01-27 | Ghasripoor FarshadChief Technology Officer | Shares withheld for tax F | −5,721 | 14.40 | 121,240 | Form 4 |
| 2025-01-27 | Yeung WilliamChief Legal Officer | Shares withheld for tax F | −4,061 | 14.40 | 105,186 | Form 4 |
| 2025-01-27 | Moon David WDirector, President and CEO | Shares withheld for tax F | −7,664 | 14.40 | 168,417 | Form 4 |
| 2025-01-23 | Mancini Michael S.Chief Financial Officer | Grant or award A | +34,223 | – | 34,223 | Form 4 |
| 2025-01-23 | Clemente RodneySVP, Water | Grant or award A | +34,223 | – | 140,590 | Form 4 |
| 2025-01-23 | Moon David WDirector, President and CEO | Grant or award A | +88,980 | – | 176,081 | Form 4 |
| 2025-01-23 | Yeung WilliamChief Legal Officer | Grant or award A | +23,956 | – | 109,247 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.