ERII

Energy Recovery, Inc.

Insider trading activity for Energy Recovery, Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

-$63.6K

net selling

Bought(0 · 0 insiders): $0
Sold(2 · 2 insiders): $63.6K

Past 6 months

-$1.6M

net selling

Bought(2 · 2 insiders): $266.1K
Sold(5 · 4 insiders): $1.9M

Past 12 months

-$3.7M

net selling

Bought(2 · 2 insiders): $266.1K
Sold(24 · 5 insiders): $3.9M

Transaction history

The 82 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Jul 28	Yeung William	Chief Legal Officer	SSELL◷?	2,048	$8.56	$17.5K	-2.0%	Open the original filing on SEC.gov
Jul 28	Clemente Rodney	SVP, Water	SSELL◷?	5,387	$8.56	$46.1K	-4.7%	Open the original filing on SEC.gov
Jul 27	Yeung William	Chief Legal Officer	FTAX	2,828	$8.42	$23.8K	-2.7%	Open the original filing on SEC.gov
Jul 27	Clemente Rodney	SVP, Water	FTAX	2,320	$8.42	$19.5K	-2.0%	Open the original filing on SEC.gov
Jul 9	Mitchell John Joseph	Director	AGRANT	16,797	—	—	—	Open the original filing on SEC.gov
Jun 15	Sabol Colin R	Director	PBUY★	11,180	$8.88	$99.3K	+25.1%	Open the original filing on SEC.gov
Jun 15	Buehler Alexander J	Interim President and…	MEXER◆	15,327	$8.60	$131.8K	—	Open the original filing on SEC.gov
Jun 15	Buehler Alexander J	Interim President and…	SSELL	14,900	$8.71	$129.8K	-18.3%	Open the original filing on SEC.gov
Jun 15	Buehler Alexander J	Interim President and…	MEXER	15,327	$8.60	$131.8K	+23.1%	Open the original filing on SEC.gov
Jun 4	Tondreau Pamela L.	Director	AGRANT	22,316	$8.29	$185K	+57.9%	Open the original filing on SEC.gov
Jun 4	Hanstveit Arve	Director	AGRANT	18,094	$8.29	$150K	+4.7%	Open the original filing on SEC.gov
Jun 4	Sabol Colin R	Director	AGRANT	18,094	$8.29	$150K	+68.5%	Open the original filing on SEC.gov
Jun 4	Chow Joan Kai	Director	AGRANT	18,094	$8.29	$150K	+53.2%	Open the original filing on SEC.gov
May 13	Tondreau Pamela L.	Director	PBUY▲↓	20,000	$8.34	$166.8K	+115.2%	Open the original filing on SEC.gov
May 6	Ryan Aidan	Interim CFO	AGRANT	18,518	$11.61	$215K	+118.6%	Open the original filing on SEC.gov
Apr 6	Hanstveit Arve	Director	SSELL	2,419	$10.29	$24.9K	-0.6%	Open the original filing on SEC.gov
Apr 2	Hanstveit Arve	Director	SSELL	165,292	$10.14	$1.7M	-30.0%	Open the original filing on SEC.gov
Mar 10	Hanstveit Arve	Director	SSELL	25,000	$10.96	$274K	-4.3%	Open the original filing on SEC.gov
Mar 6	Hanstveit Arve	Director	SSELL	11,582	$10.62	$122.9K	-2.0%	Open the original filing on SEC.gov
Mar 5	Ramanan Natarajan	Chief Technology Officer	SSELL	272	$10.57	$2.9K	-0.5%	Open the original filing on SEC.gov
Mar 5	Hanstveit Arve	Director	SSELL	38,418	$10.71	$411.5K	-6.1%	Open the original filing on SEC.gov
Mar 4	Clemente Rodney	SVP, Water	SSELL◷	20,568	$10.61	$218.3K	-15.1%	Open the original filing on SEC.gov
Mar 3	Ramanan Natarajan	Chief Technology Officer	FTAX	2,724	$10.22	$27.8K	-4.9%	Open the original filing on SEC.gov
Feb 17	Hostetler Matthew	Chief Human Resources…	AGRANT	25,959	—	—	+126.0%	Open the original filing on SEC.gov
Feb 17	Mancini Michael S.	Chief Financial Officer	AGRANT	45,626	—	—	+155.1%	Open the original filing on SEC.gov
Feb 17	Yeung William	Chief Legal Officer	AGRANT	25,959	—	—	+33.2%	Open the original filing on SEC.gov
Feb 17	Ramanan Natarajan	Chief Technology Officer	AGRANT	29,106	—	—	+110.0%	Open the original filing on SEC.gov
Feb 17	Moon David W	President and CEO	AGRANT	81,812	—	—	+54.1%	Open the original filing on SEC.gov
Feb 17	Clemente Rodney	SVP, Water	AGRANT	45,626	—	—	+50.2%	Open the original filing on SEC.gov
Feb 6	Yeung William	Chief Legal Officer	SSELL◷	646	$15.14	$9.8K	-0.8%	Open the original filing on SEC.gov
Feb 5	Yeung William	Chief Legal Officer	SSELL◷	890	$14.59	$13K	-1.1%	Open the original filing on SEC.gov
Feb 5	Clemente Rodney	SVP, Water	SSELL◷	724	$14.59	$10.6K	-0.8%	Open the original filing on SEC.gov
Feb 2	Yeung William	Chief Legal Officer	SSELL◷	729	$14.46	$10.5K	-0.9%	Open the original filing on SEC.gov
Jan 30	Yeung William	Chief Legal Officer	FTAX◷	8,622	$14.30	$123.3K	-9.7%	Open the original filing on SEC.gov
Jan 30	Yeung William	Chief Legal Officer	FTAX◷	1,003	$14.65	$14.7K	-1.1%	Open the original filing on SEC.gov
Jan 30	Hostetler Matthew	Chief Human Resources…	FTAX	3,359	$14.30	$48K	-14.0%	Open the original filing on SEC.gov
Jan 30	Mancini Michael S.	Chief Financial Officer	FTAX	4,798	$14.30	$68.6K	-14.0%	Open the original filing on SEC.gov
Jan 30	Moon David W	President and CEO	FTAX	17,160	$14.30	$245.4K	-10.2%	Open the original filing on SEC.gov
Jan 30	Clemente Rodney	SVP, Water	FTAX	8,397	$14.30	$120.1K	-8.4%	Open the original filing on SEC.gov
Jan 30	Clemente Rodney	SVP, Water	FTAX	694	$14.65	$10.2K	-0.7%	Open the original filing on SEC.gov
Jan 28	Yeung William	Chief Legal Officer	SSELL◷	7,271	$14.55	$105.8K	-7.5%	Open the original filing on SEC.gov
Dec 5, 2025	Hanstveit Arve	Director	SSELL	15,000	$14.71	$220.6K	-2.3%	Open the original filing on SEC.gov
Dec 4, 2025	Hanstveit Arve	Director	SSELL	15,000	$14.97	$224.5K	-2.3%	Open the original filing on SEC.gov
Oct 24, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	3,530	$7.50	$26.5K	—	Open the original filing on SEC.gov
Oct 24, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	5,638	$10.19	$57.5K	—	Open the original filing on SEC.gov
Oct 24, 2025	Yeung William	Chief Legal Officer	SSELL◷	3,530	$18.00	$63.5K	-3.5%	Open the original filing on SEC.gov
Oct 24, 2025	Yeung William	Chief Legal Officer	MEXER◷	3,530	$7.50	$26.5K	+3.6%	Open the original filing on SEC.gov
Oct 24, 2025	Yeung William	Chief Legal Officer	SSELL◷	5,638	$18.00	$101.5K	-5.5%	Open the original filing on SEC.gov
Oct 24, 2025	Yeung William	Chief Legal Officer	MEXER◷	5,638	$10.19	$57.5K	+5.8%	Open the original filing on SEC.gov
Oct 23, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	3,530	$7.50	$26.5K	—	Open the original filing on SEC.gov
Oct 23, 2025	Yeung William	Chief Legal Officer	SSELL◷	3,530	$17.50	$61.8K	-3.5%	Open the original filing on SEC.gov
Oct 23, 2025	Yeung William	Chief Legal Officer	MEXER◷	3,530	$7.50	$26.5K	+3.6%	Open the original filing on SEC.gov
Oct 20, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	3,530	$7.50	$26.5K	—	Open the original filing on SEC.gov
Oct 20, 2025	Yeung William	Chief Legal Officer	SSELL◷	3,530	$17.00	$60K	-3.5%	Open the original filing on SEC.gov
Oct 20, 2025	Yeung William	Chief Legal Officer	MEXER◷	3,530	$7.50	$26.5K	+3.6%	Open the original filing on SEC.gov
Oct 16, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	3,530	$7.50	$26.5K	—	Open the original filing on SEC.gov
Oct 16, 2025	Yeung William	Chief Legal Officer	SSELL◷	3,530	$16.50	$58.2K	-3.5%	Open the original filing on SEC.gov
Oct 16, 2025	Yeung William	Chief Legal Officer	MEXER◷	3,530	$7.50	$26.5K	+3.6%	Open the original filing on SEC.gov
Oct 3, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	2,529	$7.50	$19K	—	Open the original filing on SEC.gov
Oct 3, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	1,038	$7.50	$7.8K	—	Open the original filing on SEC.gov
Oct 3, 2025	Yeung William	Chief Legal Officer	SSELL◷	2,529	$16.00	$40.5K	-2.5%	Open the original filing on SEC.gov
Oct 3, 2025	Yeung William	Chief Legal Officer	MEXER◷	2,529	$7.50	$19K	+2.6%	Open the original filing on SEC.gov
Oct 3, 2025	Yeung William	Chief Legal Officer	SSELL◷	1,038	$16.00	$16.6K	-1.1%	Open the original filing on SEC.gov
Oct 3, 2025	Yeung William	Chief Legal Officer	MEXER◷	1,038	$7.50	$7.8K	+1.1%	Open the original filing on SEC.gov
Sep 18, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	15,454	$8.95	$138.3K	—	Open the original filing on SEC.gov
Sep 18, 2025	Yeung William	Chief Legal Officer	SSELL◷	15,454	$15.09	$233.1K	-13.7%	Open the original filing on SEC.gov
Sep 18, 2025	Yeung William	Chief Legal Officer	MEXER◷	15,454	$8.95	$138.3K	+15.9%	Open the original filing on SEC.gov
Sep 11, 2025	Yeung William	Chief Legal Officer	MEXER◷◆	30,877	$8.95	$276.3K	—	Open the original filing on SEC.gov
Sep 11, 2025	Yeung William	Chief Legal Officer	SSELL◷	33,554	$14.51	$486.9K	-25.6%	Open the original filing on SEC.gov
Sep 11, 2025	Yeung William	Chief Legal Officer	MEXER◷	30,877	$8.95	$276.3K	+30.9%	Open the original filing on SEC.gov
Jul 28, 2025	Clemente Rodney	SVP, Water	SSELL◷	5,387	$13.97	$75.3K	-5.1%	Open the original filing on SEC.gov
Jul 25, 2025	Yeung William	Chief Legal Officer	FTAX	1,989	$13.88	$27.6K	-1.9%	Open the original filing on SEC.gov
Jul 25, 2025	Clemente Rodney	SVP, Water	FTAX◷	2,320	$13.88	$32.2K	-2.1%	Open the original filing on SEC.gov
Jun 12, 2025	Hanstveit Arve	Director	SSELL	30,000	$12.68	$380.4K	-4.4%	Open the original filing on SEC.gov
Jun 11, 2025	Hanstveit Arve	Director	SSELL	20,000	$12.75	$255K	-2.8%	Open the original filing on SEC.gov
Jun 5, 2025	Tondreau Pamela L.	Director	AGRANT	14,847	—	—	+36.2%	Open the original filing on SEC.gov
Jun 5, 2025	Hanstveit Arve	Director	AGRANT	12,038	—	—	+1.7%	Open the original filing on SEC.gov
Jun 5, 2025	Sabol Colin R	Director	AGRANT	12,038	—	—	+83.8%	Open the original filing on SEC.gov
Jun 5, 2025	Chow Joan Kai	Director	AGRANT	12,038	—	—	+54.8%	Open the original filing on SEC.gov
Jun 5, 2025	Buehler Alexander J	Director	AGRANT	12,038	—	—	+22.2%	Open the original filing on SEC.gov
May 14, 2025	Tondreau Pamela L.	Director	PBUY	4,200	$12.28	$51.6K	+11.4%	Open the original filing on SEC.gov
May 13, 2025	Moon David W	President and CEO	PBUY	4,200	$12.20	$51.2K	+12.8%	Open the original filing on SEC.gov

SSELL◷?$17.5K

Yeung William · Chief Legal…Jul 28

2,048 sh @ $8.56 · -2.0% own

SSELL◷?$46.1K

Clemente Rodney · SVP, WaterJul 28

5,387 sh @ $8.56 · -4.7% own

FTAX$23.8K

Yeung William · Chief Legal…Jul 27

2,828 sh @ $8.42 · -2.7% own

FTAX$19.5K

Clemente Rodney · SVP, WaterJul 27

2,320 sh @ $8.42 · -2.0% own

AGRANT—

Mitchell John Joseph · DirectorJul 9

16,797 sh

PBUY★$99.3K

Sabol Colin R · DirectorJun 15

11,180 sh @ $8.88 · +25.1% own

MEXER◆$131.8K

Buehler Alexander J · Interim President…Jun 15

15,327 sh @ $8.60

SSELL$129.8K

Buehler Alexander J · Interim President…Jun 15

14,900 sh @ $8.71 · -18.3% own

MEXER$131.8K

Buehler Alexander J · Interim President…Jun 15

15,327 sh @ $8.60 · +23.1% own

AGRANT$185K

Tondreau Pamela L. · DirectorJun 4

22,316 sh @ $8.29 · +57.9% own

AGRANT$150K

Hanstveit Arve · DirectorJun 4

18,094 sh @ $8.29 · +4.7% own

AGRANT$150K

Sabol Colin R · DirectorJun 4

18,094 sh @ $8.29 · +68.5% own

AGRANT$150K

Chow Joan Kai · DirectorJun 4

18,094 sh @ $8.29 · +53.2% own

PBUY▲↓$166.8K

Tondreau Pamela L. · DirectorMay 13

20,000 sh @ $8.34 · +115.2% own

AGRANT$215K

Ryan Aidan · Interim CFOMay 6

18,518 sh @ $11.61 · +118.6% own

SSELL$24.9K

Hanstveit Arve · DirectorApr 6

2,419 sh @ $10.29 · -0.6% own

SSELL$1.7M

Hanstveit Arve · DirectorApr 2

165,292 sh @ $10.14 · -30.0% own

SSELL$274K

Hanstveit Arve · DirectorMar 10

25,000 sh @ $10.96 · -4.3% own

SSELL$122.9K

Hanstveit Arve · DirectorMar 6

11,582 sh @ $10.62 · -2.0% own

SSELL$2.9K

Ramanan Natarajan · Chief Technology…Mar 5

272 sh @ $10.57 · -0.5% own

SSELL$411.5K

Hanstveit Arve · DirectorMar 5

38,418 sh @ $10.71 · -6.1% own

SSELL◷$218.3K

Clemente Rodney · SVP, WaterMar 4

20,568 sh @ $10.61 · -15.1% own

FTAX$27.8K

Ramanan Natarajan · Chief Technology…Mar 3

2,724 sh @ $10.22 · -4.9% own

AGRANT—

Hostetler Matthew · Chief Human…Feb 17

25,959 sh · +126.0% own

AGRANT—

Mancini Michael S. · Chief Financial…Feb 17

45,626 sh · +155.1% own

AGRANT—

Yeung William · Chief Legal…Feb 17

25,959 sh · +33.2% own

AGRANT—

Ramanan Natarajan · Chief Technology…Feb 17

29,106 sh · +110.0% own

AGRANT—

Moon David W · President and CEOFeb 17

81,812 sh · +54.1% own

AGRANT—

Clemente Rodney · SVP, WaterFeb 17

45,626 sh · +50.2% own

SSELL◷$9.8K

Yeung William · Chief Legal…Feb 6

646 sh @ $15.14 · -0.8% own

SSELL◷$13K

Yeung William · Chief Legal…Feb 5

890 sh @ $14.59 · -1.1% own

SSELL◷$10.6K

Clemente Rodney · SVP, WaterFeb 5

724 sh @ $14.59 · -0.8% own

SSELL◷$10.5K

Yeung William · Chief Legal…Feb 2

729 sh @ $14.46 · -0.9% own

FTAX◷$123.3K

Yeung William · Chief Legal…Jan 30

8,622 sh @ $14.30 · -9.7% own

FTAX◷$14.7K

Yeung William · Chief Legal…Jan 30

1,003 sh @ $14.65 · -1.1% own

FTAX$48K

Hostetler Matthew · Chief Human…Jan 30

3,359 sh @ $14.30 · -14.0% own

FTAX$68.6K

Mancini Michael S. · Chief Financial…Jan 30

4,798 sh @ $14.30 · -14.0% own

FTAX$245.4K

Moon David W · President and CEOJan 30

17,160 sh @ $14.30 · -10.2% own

FTAX$120.1K

Clemente Rodney · SVP, WaterJan 30

8,397 sh @ $14.30 · -8.4% own

FTAX$10.2K

Clemente Rodney · SVP, WaterJan 30

694 sh @ $14.65 · -0.7% own

SSELL◷$105.8K

Yeung William · Chief Legal…Jan 28

7,271 sh @ $14.55 · -7.5% own

SSELL$220.6K

Hanstveit Arve · DirectorDec 5, 2025

15,000 sh @ $14.71 · -2.3% own

SSELL$224.5K

Hanstveit Arve · DirectorDec 4, 2025

15,000 sh @ $14.97 · -2.3% own

MEXER◷◆$26.5K

Yeung William · Chief Legal…Oct 24, 2025

3,530 sh @ $7.50

MEXER◷◆$57.5K

Yeung William · Chief Legal…Oct 24, 2025

5,638 sh @ $10.19

SSELL◷$63.5K

Yeung William · Chief Legal…Oct 24, 2025

3,530 sh @ $18.00 · -3.5% own

MEXER◷$26.5K

Yeung William · Chief Legal…Oct 24, 2025

3,530 sh @ $7.50 · +3.6% own

SSELL◷$101.5K

Yeung William · Chief Legal…Oct 24, 2025

5,638 sh @ $18.00 · -5.5% own

MEXER◷$57.5K

Yeung William · Chief Legal…Oct 24, 2025

5,638 sh @ $10.19 · +5.8% own

MEXER◷◆$26.5K

Yeung William · Chief Legal…Oct 23, 2025

3,530 sh @ $7.50

SSELL◷$61.8K

Yeung William · Chief Legal…Oct 23, 2025

3,530 sh @ $17.50 · -3.5% own

MEXER◷$26.5K

Yeung William · Chief Legal…Oct 23, 2025

3,530 sh @ $7.50 · +3.6% own

MEXER◷◆$26.5K

Yeung William · Chief Legal…Oct 20, 2025

3,530 sh @ $7.50

SSELL◷$60K

Yeung William · Chief Legal…Oct 20, 2025

3,530 sh @ $17.00 · -3.5% own

MEXER◷$26.5K

Yeung William · Chief Legal…Oct 20, 2025

3,530 sh @ $7.50 · +3.6% own

MEXER◷◆$26.5K

Yeung William · Chief Legal…Oct 16, 2025

3,530 sh @ $7.50

SSELL◷$58.2K

Yeung William · Chief Legal…Oct 16, 2025

3,530 sh @ $16.50 · -3.5% own

MEXER◷$26.5K

Yeung William · Chief Legal…Oct 16, 2025

3,530 sh @ $7.50 · +3.6% own

MEXER◷◆$19K

Yeung William · Chief Legal…Oct 3, 2025

2,529 sh @ $7.50

MEXER◷◆$7.8K

Yeung William · Chief Legal…Oct 3, 2025

1,038 sh @ $7.50

SSELL◷$40.5K

Yeung William · Chief Legal…Oct 3, 2025

2,529 sh @ $16.00 · -2.5% own

MEXER◷$19K

Yeung William · Chief Legal…Oct 3, 2025

2,529 sh @ $7.50 · +2.6% own

SSELL◷$16.6K

Yeung William · Chief Legal…Oct 3, 2025

1,038 sh @ $16.00 · -1.1% own

MEXER◷$7.8K

Yeung William · Chief Legal…Oct 3, 2025

1,038 sh @ $7.50 · +1.1% own

MEXER◷◆$138.3K

Yeung William · Chief Legal…Sep 18, 2025

15,454 sh @ $8.95

SSELL◷$233.1K

Yeung William · Chief Legal…Sep 18, 2025

15,454 sh @ $15.09 · -13.7% own

MEXER◷$138.3K

Yeung William · Chief Legal…Sep 18, 2025

15,454 sh @ $8.95 · +15.9% own

MEXER◷◆$276.3K

Yeung William · Chief Legal…Sep 11, 2025

30,877 sh @ $8.95

SSELL◷$486.9K

Yeung William · Chief Legal…Sep 11, 2025

33,554 sh @ $14.51 · -25.6% own

MEXER◷$276.3K

Yeung William · Chief Legal…Sep 11, 2025

30,877 sh @ $8.95 · +30.9% own

SSELL◷$75.3K

Clemente Rodney · SVP, WaterJul 28, 2025

5,387 sh @ $13.97 · -5.1% own

FTAX$27.6K

Yeung William · Chief Legal…Jul 25, 2025

1,989 sh @ $13.88 · -1.9% own

FTAX◷$32.2K

Clemente Rodney · SVP, WaterJul 25, 2025

2,320 sh @ $13.88 · -2.1% own

SSELL$380.4K

Hanstveit Arve · DirectorJun 12, 2025

30,000 sh @ $12.68 · -4.4% own

SSELL$255K

Hanstveit Arve · DirectorJun 11, 2025

20,000 sh @ $12.75 · -2.8% own

AGRANT—

Tondreau Pamela L. · DirectorJun 5, 2025

14,847 sh · +36.2% own

AGRANT—

Hanstveit Arve · DirectorJun 5, 2025

12,038 sh · +1.7% own

AGRANT—

Sabol Colin R · DirectorJun 5, 2025

12,038 sh · +83.8% own

AGRANT—

Chow Joan Kai · DirectorJun 5, 2025

12,038 sh · +54.8% own

AGRANT—

Buehler Alexander J · DirectorJun 5, 2025

12,038 sh · +22.2% own

PBUY$51.6K

Tondreau Pamela L. · DirectorMay 14, 2025

4,200 sh @ $12.28 · +11.4% own

PBUY$51.2K

Moon David W · President and CEOMay 13, 2025

4,200 sh @ $12.20 · +12.8% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

3 of 48 filings we hold were filed after the two-business-day deadline. The furthest past the deadline was 31 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
May 6	Jun 24	Ryan AidanInterim CFO	31days · about 1 month	$215K	Filing ↗
Jul 9	Jul 21	Mitchell John JosephDirector	6days	—	Filing ↗
Jan 28	Feb 2	Yeung WilliamChief Legal Officer	1day	$123.3K	Filing ↗

Ryan AidanInterim CFO

31days · about 1 month

Traded May 6 · filed Jun 24Filing ↗

Mitchell John JosephDirector

6days

Traded Jul 9 · filed Jul 21Filing ↗

Yeung WilliamChief Legal Officer

1day

Traded Jan 28 · filed Feb 2Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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