UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 3, 2016 (May 31, 2015)

Energy Recovery, Inc.

(Exact Name of Registrant as Specified in its Charter)

1717 Doolittle Dr. San Leandro, CA 94577

(Address if Principal Executive Offices)(Zip Code)

510-483-7370

(Registrant’s telephone number, including area code)

Not applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On May 31, 2015, Energy Recovery (the “Company) accepted the resignation of its Chief Sales Officer, Mr. David Barnes. The separation was originally reported in a Form 8-K filed on June 4, 2015. Mr. Barnes had previously been afforded the opportunity to either (i) voluntarily resign or be terminated for unsatisfactory performance; and (ii) execute a mutual release of claims. Subsequently, Mr. Barnes rejected the mutual release and rejected his resignation. Consequently, the Company is now reclassifying Mr. Barnes’ separation from the Company as an involuntary separation.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.