Energy Recovery Inc. (ERII) Insider Trading

Last 12 months

Insiders bought $266k and sold $3.75M on the open market.

18% of the selling was scheduled in advance under 10b5-1 plans. Director Arve Hanstveit sold $1.68M on Apr 2, 25% of their stake, outside a plan.

Net open-market

−$3.48M

2 buys · 14 sales

Under a 10b5-1 plan

18%

of the value sold

Insiders who bought / sold

2 / 5

executives and directors

Last open-market buy

Jun 2026

Jun 15, 2026

Get an email when ERII's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Jul 28	Rodney Clemente SVP, Water	Sold10b5-1 plan	5,387	$8.56	$46k	4.7%	Form 4
Jul 28	William Yeung Chief Legal Officer	Sold10b5-1 plan	2,048	$8.56	$18k	1.9%	Form 4
Jun 15	Colin R Sabol Director	Bought	11,180	$8.88	$99k	24%	Form 4
Jun 15	Alexander J Buehler Interim President and CEO	SoldNo plan	14,900	$8.71	$130k	18%	Form 4
May 13	Pamela L. Tondreau Director	Bought	20,000	$8.34	$167k	36%	Form 4
Apr 6	Arve Hanstveit Director	SoldNo plan	2,419	$10.29	$25k	0.5%	Form 4
Apr 2	Arve Hanstveit Director	SoldNo plan	165,292	$10.14	$1.68M	25%	Form 4
Mar 10	Arve Hanstveit Director	SoldNo plan	25,000	$10.96	$274k	3.6%	Form 4
Mar 5 – 6	Arve Hanstveit Director	SoldNo plan 2 parts	50,000	$10.69 average	$534k	8.0%	Form 4
Mar 5	Natarajan Ramanan Chief Technology Officer	SoldNo plan	272	$10.57	$3k	0.5%	Form 4
Mar 4	Rodney Clemente SVP, Water	Sold10b5-1 plan	20,568	$10.61	$218k	15%	Form 4
Feb 5 – 6	William Yeung Chief Legal Officer	Sold10b5-1 plan 2 parts	1,536	$14.82 average	$23k	1.9%	Form 4
Feb 5	Rodney Clemente SVP, Water	Sold10b5-1 plan	724	$14.59	$11k	0.8%	Form 4
Jan 28 – Feb 2	William Yeung Chief Legal Officer	Sold10b5-1 plan 2 parts	8,000	$14.54 average	$116k	8.6%	Form 4
Dec 4, 2025 – Dec 5, 2025	Arve Hanstveit Director	SoldNo plan 2 parts	30,000	$14.84 average	$445k	3.9%	Form 4
Oct 23, 2025 – Oct 24, 2025	William Yeung Chief Legal Officer	Sold10b5-1 plan 3 parts	12,698	$17.86 average	$227k	11%	Form 4
Oct 20, 2025	William Yeung Chief Legal Officer	Sold10b5-1 plan	3,530	$17.00	$60k	3.3%	Form 4
Oct 16, 2025	William Yeung Chief Legal Officer	Sold10b5-1 plan	3,530	$16.50	$58k	3.3%	Form 4
Oct 3, 2025	William Yeung Chief Legal Officer	Sold10b5-1 plan 2 parts	3,567	$16.00 average	$57k	3.3%	Form 4
Sep 18, 2025	William Yeung Chief Legal Officer	Sold10b5-1 plan	15,454	$15.09	$233k	13%	Form 4
Sep 11, 2025	William Yeung Chief Legal Officer	Sold10b5-1 plan	33,554	$14.51	$487k	26%	Form 4
Jul 28, 2025	Rodney Clemente SVP, Water	Sold10b5-1 plan	5,387	$13.97	$75k	5.1%	Form 4
Jun 11, 2025 – Jun 12, 2025	Arve Hanstveit Director	SoldNo plan 2 parts	50,000	$12.71 average	$635k	6.1%	Form 4
May 14, 2025	Pamela L. Tondreau Director	Bought	4,200	$12.28	$52k	11%	Form 4
May 13, 2025	David W Moon President and CEO	Bought	4,200	$12.20	$51k	2.1%	Form 4
Mar 11, 2025	Arve Hanstveit Director	SoldNo plan	50,000	$16.34	$817k	6.7%	Form 4
Mar 11, 2025	Rodney Clemente SVP, Water	Sold10b5-1 plan	1,843	$16.23	$30k	1.7%	Form 4
Feb 20, 2025	Rodney Clemente SVP, Water	Sold10b5-1 plan	21,444	$15.42	$331k	16%	Form 4
Dec 11, 2024	Arve Hanstveit Director	SoldNo plan	20,000	$16.87	$337k	2.3%	Form 4
Nov 7, 2024 – Nov 11, 2024	Rodney Clemente SVP, Water	Sold10b5-1 plan 3 parts	27,456	$20.03 average	$550k	21%	Form 4
Oct 28, 2024	Farshad Ghasripoor Chief Technology Officer	SoldNo plan	10,526	$17.97	$189k	7.7%	Form 4
Oct 28, 2024	Rodney Clemente SVP, Water	SoldNo plan	6,505	$17.98	$117k	4.6%	Form 4
Oct 28, 2024	David W Moon President and CEO	SoldNo plan	2,550	$17.97	$46k	2.8%	Form 4

Jul 2810b5-1 plan
Rodney Clemente
SVP, Water · sold 5,387 at $8.56
$46k
4.7% of stake
Jul 2810b5-1 plan
William Yeung
Chief Legal Officer · sold 2,048 at $8.56
$18k
1.9% of stake
Jun 15
Colin R Sabol
Director · bought 11,180 at $8.88
$99k
24% of stake
Jun 15No plan
Alexander J Buehler
Interim President and CEO · sold 14,900 at $8.71
$130k
18% of stake
May 13
Pamela L. Tondreau
Director · bought 20,000 at $8.34
$167k
36% of stake
Apr 6No plan
Arve Hanstveit
Director · sold 2,419 at $10.29
$25k
0.5% of stake
Apr 2No plan
Arve Hanstveit
Director · sold 165,292 at $10.14
$1.68M
25% of stake
Mar 10No plan
Arve Hanstveit
Director · sold 25,000 at $10.96
$274k
3.6% of stake
Mar 5 – 6No plan
Arve Hanstveit
Director · sold 50,000 at avg $10.69
$534k
8.0% of stake
Mar 5No plan
Natarajan Ramanan
Chief Technology Officer · sold 272 at $10.57
$3k
0.5% of stake
Mar 410b5-1 plan
Rodney Clemente
SVP, Water · sold 20,568 at $10.61
$218k
15% of stake
Feb 5 – 610b5-1 plan
William Yeung
Chief Legal Officer · sold 1,536 at avg $14.82
$23k
1.9% of stake
Feb 510b5-1 plan
Rodney Clemente
SVP, Water · sold 724 at $14.59
$11k
0.8% of stake
Jan 28 – Feb 210b5-1 plan
William Yeung
Chief Legal Officer · sold 8,000 at avg $14.54
$116k
8.6% of stake
Dec 4, 2025 – Dec 5, 2025No plan
Arve Hanstveit
Director · sold 30,000 at avg $14.84
$445k
3.9% of stake
Oct 23, 2025 – Oct 24, 202510b5-1 plan
William Yeung
Chief Legal Officer · sold 12,698 at avg $17.86
$227k
11% of stake
Oct 20, 202510b5-1 plan
William Yeung
Chief Legal Officer · sold 3,530 at $17.00
$60k
3.3% of stake
Oct 16, 202510b5-1 plan
William Yeung
Chief Legal Officer · sold 3,530 at $16.50
$58k
3.3% of stake
Oct 3, 202510b5-1 plan
William Yeung
Chief Legal Officer · sold 3,567 at avg $16.00
$57k
3.3% of stake
Sep 18, 202510b5-1 plan
William Yeung
Chief Legal Officer · sold 15,454 at $15.09
$233k
13% of stake
Sep 11, 202510b5-1 plan
William Yeung
Chief Legal Officer · sold 33,554 at $14.51
$487k
26% of stake
Jul 28, 202510b5-1 plan
Rodney Clemente
SVP, Water · sold 5,387 at $13.97
$75k
5.1% of stake
Jun 11, 2025 – Jun 12, 2025No plan
Arve Hanstveit
Director · sold 50,000 at avg $12.71
$635k
6.1% of stake
May 14, 2025
Pamela L. Tondreau
Director · bought 4,200 at $12.28
$52k
11% of stake
May 13, 2025
David W Moon
President and CEO · bought 4,200 at $12.20
$51k
2.1% of stake
Mar 11, 2025No plan
Arve Hanstveit
Director · sold 50,000 at $16.34
$817k
6.7% of stake
Mar 11, 202510b5-1 plan
Rodney Clemente
SVP, Water · sold 1,843 at $16.23
$30k
1.7% of stake
Feb 20, 202510b5-1 plan
Rodney Clemente
SVP, Water · sold 21,444 at $15.42
$331k
16% of stake
Dec 11, 2024No plan
Arve Hanstveit
Director · sold 20,000 at $16.87
$337k
2.3% of stake
Nov 7, 2024 – Nov 11, 202410b5-1 plan
Rodney Clemente
SVP, Water · sold 27,456 at avg $20.03
$550k
21% of stake
Oct 28, 2024No plan
Farshad Ghasripoor
Chief Technology Officer · sold 10,526 at $17.97
$189k
7.7% of stake
Oct 28, 2024No plan
Rodney Clemente
SVP, Water · sold 6,505 at $17.98
$117k
4.6% of stake
Oct 28, 2024No plan
David W Moon
President and CEO · sold 2,550 at $17.97
$46k
2.8% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch ERII, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in ERII's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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