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Energy Recovery, Inc. (ERII)

Energy Recovery, Inc. (ERII) Insider Trading

Directors, officers and holders of more than 10% of ERII report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.

Recent Form 4 transactions

The 50 most recent of 115 transactions on file: 2 with code P, 19 with code S and 29 with other codes.

DateInsiderCodeShares
Jul 28, 2026Clemente RodneyS Sale5,387
Jul 28, 2026Yeung WilliamS Sale2,048
Jul 27, 2026Yeung WilliamF Tax Payment2,828
Jul 27, 2026Clemente RodneyF Tax Payment2,320
Jul 9, 2026Mitchell John JosephA Award15,186
Jun 15, 2026BUEHLER ALEXANDER JM Exercise15,327
Jun 15, 2026BUEHLER ALEXANDER JM Exercise15,327
Jun 15, 2026Sabol Colin RP Purchase11,180
Jun 15, 2026BUEHLER ALEXANDER JS Sale14,900
Jun 4, 2026TONDREAU PAMELA L.A Award22,316
Jun 4, 2026Chow Joan KaiA Award18,094
Jun 4, 2026Hanstveit ArveA Award18,094
Jun 4, 2026Sabol Colin RA Award18,094
May 13, 2026TONDREAU PAMELA L.P Purchase20,000
May 6, 2026Ryan AidanA Award18,518
Apr 6, 2026Hanstveit ArveS Sale2,419
Apr 2, 2026Hanstveit ArveS Sale165,292
Mar 10, 2026Hanstveit ArveS Sale25,000
Mar 6, 2026Hanstveit ArveS Sale11,582
Mar 5, 2026Hanstveit ArveS Sale38,418
Mar 5, 2026Ramanan NatarajanS Sale272
Mar 4, 2026Clemente RodneyS Sale20,568
Mar 3, 2026Ramanan NatarajanF Tax Payment2,724
Feb 17, 2026Mancini Michael S.A Award45,626
Feb 17, 2026Moon David WA Award81,812
Feb 17, 2026Clemente RodneyA Award45,626
Feb 17, 2026Hostetler MatthewA Award25,959
Feb 17, 2026Ramanan NatarajanA Award29,106
Feb 17, 2026Yeung WilliamA Award25,959
Feb 6, 2026Yeung WilliamS Sale646
Feb 5, 2026Yeung WilliamS Sale890
Feb 5, 2026Clemente RodneyS Sale724
Feb 2, 2026Yeung WilliamS Sale729
Jan 30, 2026Hostetler MatthewF Tax Payment3,359
Jan 30, 2026Moon David WF Tax Payment17,160
Jan 30, 2026Clemente RodneyF Tax Payment8,397
Jan 30, 2026Mancini Michael S.F Tax Payment4,798
Jan 30, 2026Yeung WilliamF Tax Payment8,622
Jan 30, 2026Clemente RodneyF Tax Payment694
Jan 30, 2026Yeung WilliamF Tax Payment1,003
Jan 28, 2026Yeung WilliamS Sale7,271
Dec 5, 2025Hanstveit ArveS Sale15,000
Dec 4, 2025Hanstveit ArveS Sale15,000
Oct 24, 2025Yeung WilliamM Exercise5,638
Oct 24, 2025Yeung WilliamS Sale3,530
Oct 24, 2025Yeung WilliamM Exercise3,530
Oct 24, 2025Yeung WilliamS Sale5,638
Oct 24, 2025Yeung WilliamM Exercise5,638
Oct 24, 2025Yeung WilliamM Exercise3,530
Oct 23, 2025Yeung WilliamM Exercise3,530

The full Form 4 history is on the ERII company page (Insider Trades card, View all).

Questions about this data

Which insider transactions are open-market trades?

Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.

How quickly are insider trades reported?

A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.

Who has to file Form 4?

Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.

Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.