ERII / Energy Recovery, Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Energy Recovery, Inc.
US ˙ NasdaqGS ˙ US29270J1007

Mga Batayang Estadistika
LEI 549300ZEQL52Z525WJ22
CIK 1421517
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Energy Recovery, Inc.
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
August 6, 2025 EX-99.1

Energy Recovery Announces New Share Repurchase Program

Exhibit 99.1 Energy Recovery Announces New Share Repurchase Program •New $25 million repurchase follows two earlier programs for a total of $105 million between November 2024 and August 2025 ◦$50 million share repurchase announced in November 2024 was completed in Q4 2024 ◦$30 million share repurchase announced in February 2025 is nearing completion •Board authorization reflects continued strong c

August 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 Energy Recovery, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 6, 2025 EX-99.1

Energy Recovery Reports its Second Quarter 2025 Financial Results

Exhibit 99.1 Energy Recovery Reports its Second Quarter 2025 Financial Results SAN LEANDRO, Calif. - August 6, 2025 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the second quarter and six months ended June 30, 2025. Second Quarter Highlights •Q2’2025 financial results were in-line with internal expectations and consistent with

August 6, 2025 10-Q

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recov

August 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 ENERGY RECOVERY, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

June 11, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2025 (June 5, 2025) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (

May 23, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 (State or other jurisdiction of incorporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 (State or other jurisdiction of incorporation) (Commission File Number) 1717 Doolittle Drive, San Leandro, California 94577 (Address of principal executive offices) (Zip Code) William Yeung (510

May 23, 2025 EX-1.01

Conflict Minerals Report, as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 Energy Recovery Inc. Conflict Minerals Report For The Calendar Year Ended December 31, 2024 Introduction For the year ended December 31, 2024, Energy Recovery, Inc. (the “Company”, “Energy Recovery”, “our”, “us”, or “we”), in good faith, has conducted a reasonable country of origin inquiry (“RCOI”) of our products using the Responsible Minerals Initiative’s (“RMI”) Conflict Minerals R

May 7, 2025 10-Q

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Reco

May 7, 2025 EX-10.1

Offer of Employment by and between Energy Recovery, Inc. and Ram Ramanan as Chief Technology Officer

Exhibit 10.1 February 11, 2025 Mr. Ram Ramanan Re: Offer of Employment with Energy Recovery, Inc. as Chief Technical Officer Dear Ram: We are pleased to offer you a full-time position with Energy Recovery, Inc. (the “Company), as Chief Technical Officer, reporting to David Moon, President and Chief Executive Officer, based in our headquarters in San Leandro, California, and subject to the followin

May 7, 2025 EX-10.2

Professional Services Agreement by and between Energy Recovery, Inc. and Farshad G

Exhibit 10.2 Professional Services Agreement This Professional Services Agreement (“Agreement”), is entered into as of March 15, 2025 (“Effective Date”) between Energy Recovery, Inc., a Delaware corporation, with headquarters at 1717 Doolittle Drive, San Leandro, CA 94577 (“ERII”), and Farshad Ghasripoor, (“Consultant”); and collectively referred to herein as the Parties. NOW THEREFORE, in conside

May 7, 2025 EX-99.1

Energy Recovery Reports its First Quarter 2025 Financial Results

Exhibit 99.1 Energy Recovery Reports its First Quarter 2025 Financial Results SAN LEANDRO, Calif. - May 7, 2025 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the first quarter ended March 31, 2025. First Quarter Highlights •Q1’25 financial results were in-line with internal expectations and consistent with our communicated expe

May 7, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2025 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

April 21, 2025 DEF 14A

DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐Preliminary Proxy Statement ☐Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒Definitive Proxy Statemen

February 26, 2025 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 26, 2025 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

February 26, 2025 EX-19.1

Energy Recovery, Inc. Insider Trading Policy dated November 4, 2020.

Exhibit 19.1 ENERGY RECOVERY, INC. AMENDED AND RESTATED INSIDER TRADING POLICY (effective November 4, 2020) TABLE OF CONTENTS Page I. The Need for an Insider Trading Policy 1 II. What is Material Non-Public Information? 1 III. The Consequences of Insider Trading 3 IV. Our Policy 4 General Prohibition on Trading 4 Transactions by Family Members, Others in Your Household and Entities You Control 4 O

February 26, 2025 EX-21.1

List of subsidiaries of the Company.

Exhibit 21.1 Energy Recovery, Inc. LIST OF REGISTRANT'S SUBSIDIARIES Subsidiaries of Registrant (All 100% Owned) Country/State of Incorporation/Formation Energy Recovery Iberia, S.L. Spain Energy Recovery Canada, Corp. Canada

February 26, 2025 EX-10.20

Energy Recovery, Inc. 2020 Incentive Plan Performance Restricted Stock Unit

Exhibit 10.20 ENERGY RECOVERY, INC. 2020 INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT NOTICE AND PERFORMANCE RESTRICTED STOCK UNIT AGREEMENT Energy Recovery, Inc., a Delaware corporation (the “Company”), pursuant to its 2020 Incentive Plan (the “Plan”), hereby grants to the individual listed below (the “Grantee”) an Award for the target number of Performance Restricted Stock Units (“PRSU

February 26, 2025 EX-10.1

Ram Ramanan, as Chief Technology Officer

Exhibit 10.1 February 11, 2025 Mr. Ram Ramanan Via email [email protected] Re: Offer of Employment with Energy Recovery, Inc. as Chief Technical Officer Dear Ram: We are pleased to offer you a full-time position with Energy Recovery, Inc. (the “Company”), as Chief Technical Officer, reporting to David Moon, President and Chief Executive Officer, based in our headquarters in San Leandro, Califor

February 26, 2025 10-K

SECURITIES AND EXCHANGE COMMISSION

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recovery

February 26, 2025 EX-99.1

Energy Recovery Reports its Fourth Quarter 2024 Financial Results

Exhibit 99.1 Energy Recovery Reports its Fourth Quarter 2024 Financial Results SAN LEANDRO, Calif. - February 26, 2025 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the fourth quarter and year ended December 31, 2024. Fourth Quarter Highlights •Revenue of $67.1 million, an increase of 17% as compared to Q4’2023 and resulting in

February 26, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 26, 2025 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

February 26, 2025 EX-99.1

Energy Recovery Appoints New CTO and VP, Wastewater

Exhibit 99.1 Energy Recovery Appoints New CTO and VP, Wastewater •Dr. Ram Ramanan, with more than three decades in product innovation leadership at companies including Bloom Energy, to become Chief Technology Officer •Dr. Ramanan to assume duties following the handover and retirement of Farshad Ghasripoor, who will serve as an executive advisor through October 2025 •After six years with Energy Rec

February 26, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 26, 2025 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

February 26, 2025 EX-99.1

Energy Recovery Announces New Share Repurchase Program

Exhibit 99.1 Energy Recovery Announces New Share Repurchase Program •New $30 million program follows Q4 2024 completion of share repurchase announced in November 2024 •Board authorization underscores balance sheet strength and free cash flow generation as company executes growth strategy •Continued cost management and margin improvement initiatives driving confidence in long-term strategic operati

February 14, 2025 EX-99.EX1

Schedule 13G

EX-99.EX1 2 ck0001669811-ex99ex1.htm EX-99.EX1 Exhibit I to Schedule 13G Ameriprise Financial, Inc., a Delaware Corporation, is a parent holding company. The classification and identity of the relevant subsidiaries is as follows: Non-US Institution in accordance with Rule 13d-1(b)(1)(ii)(J) – TAM UK International Holdings Limited, a private limited company incorporated in England and Wales, is a h

November 20, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2024 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 20, 2024 EX-99.1

Energy Recovery Announces Share Repurchase Program

Exhibit 99.1 Energy Recovery Announces Share Repurchase Program SAN LEANDRO, Calif. — Nov. 18, 2024 — Energy Recovery, Inc. (Nasdaq: ERII) today announced that its Board of Directors approved a share repurchase program to purchase up to $50 million of the company's outstanding common stock over the next 12 months, beginning in November 2024. “With our strategic plan, or Playbook, complete we now h

November 14, 2024 SC 13G/A

ERII / Energy Recovery, Inc. / BROWN CAPITAL MANAGEMENT LLC Passive Investment

SC 13G/A 1 fp0090934-1sc13ga.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (AMENDMENT NO. 1)* Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 Par Value (Title of Class of Securities) 29270J100 (CUSIP Num

November 14, 2024 EX-99.III

to Schedule 13G Powers of Attorney LIMITED POWER OF ATTORNEY

EX-99.III 4 d892428dex99iii.htm EX-99.III Exhibit III to Schedule 13G Powers of Attorney LIMITED POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS, which are intended to constitute a Limited Power of Attorney, that TAM UK International Holdings Limited, a company incorporated under the laws of England and Wales under registered number 12728685, with its principal place of business at Cannon Place,

November 14, 2024 EX-99.II

to Schedule 13G Joint Filing Agreement

EX-99.II 3 d892428dex99ii.htm EX-99.II Exhibit II to Schedule 13G Joint Filing Agreement The undersigned persons agree and consent to the joint filing on their behalf of this Schedule 13G dated November 14, 2024 in connection with their beneficial ownership of Energy Recovery, Inc. Each of TAM UK International Holdings Limited, Threadneedle Holdings Limited, TAM UK Holdings Limited, Threadneedle A

November 14, 2024 EX-99.I

to Schedule 13G

EX-99.I 2 d892428dex99i.htm EX-99.I Exhibit I to Schedule 13G Ameriprise Financial, Inc., a Delaware Corporation, is a parent holding company. The classification and identity of the relevant subsidiaries is as follows: Non-US Institution – TAM UK International Holdings Limited, a private limited company incorporated in England and Wales, is a holding company and parent entity to Threadneedle Holdi

November 14, 2024 SC 13G

ERII / Energy Recovery, Inc. / AMERIPRISE FINANCIAL INC - SC 13G Passive Investment

SC 13G 1 d892428dsc13g.htm SC 13G SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities and Exchange Act of 1934 Energy Recovery, Inc (Name of Issuer) Common Stock (Title of Class of Securities) 29270J100 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

October 30, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 30, 2024 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

October 30, 2024 EX-99.1

Energy Recovery Reports its Third Quarter 2024 Financial Results

Exhibit 99.1 Energy Recovery Reports its Third Quarter 2024 Financial Results SAN LEANDRO, Calif. - October 30, 2024 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the third quarter and nine months ended September 30, 2024. Third Quarter Highlights •Revenue of $38.6 million, reaching the upper end of our guidance of $35 - $39 mi

October 30, 2024 10-Q

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy

July 31, 2024 10-Q

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recov

July 31, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 31, 2024 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

July 31, 2024 EX-99

Energy Recovery Appoints Mike Mancini as Chief Financial Officer

Exhibit 99.1 Energy Recovery Appoints Mike Mancini as Chief Financial Officer SAN LEANDRO, Calif. — July 31, 2024 — Energy Recovery, Inc. (Nasdaq: ERII) today announced the appointment of Michael (Mike) Mancini as Chief Financial Officer (CFO). He will join Energy Recovery on August 5, 2024. Mr. Mancini is an experienced CFO and business strategist with extensive operational and capital markets ex

July 31, 2024 EX-99.1

Energy Recovery Reports its Second Quarter 2024 Financial Results

Exhibit 99.1 Energy Recovery Reports its Second Quarter 2024 Financial Results SAN LEANDRO, Calif. - July 31, 2024 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the second quarter and six months ended June 30, 2024. Second Quarter Highlights •Revenue of $27.2 million, exceeding the upper end of our guidance of $20 - $25 million

July 31, 2024 EX-10.1

Offer Letter to Mr. Michael Mancini, as Chief Financial Officer

Exhibit 10.1 July 5, 2024 Mr. Michael Mancini Via email Re: Offer of Employment with Energy Recovery, Inc. as Chief Financial Officer Dear Michael: We are pleased to offer you a full-time position with Energy Recovery, Inc. (the “Company), as Chief Financial Officer, reporting to David Moon, President and Chief Executive Officer, based in our headquarters in San Leandro, California, and subject to

July 31, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 31, 2024 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

July 15, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 10, 2024 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

July 2, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 28, 2024 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

July 2, 2024 EX-10.1

, 2024, by and between Energy Recovery, Inc. and Joshua Ballard.

Exhibit 10.1 GENERAL RELEASE THIS GENERAL RELEASE (the “Agreement”) is made by and between Joshua Ballard (“Employee”) and Energy Recovery, Inc. (“Employer”). For purposes of this Agreement, it is agreed that “Employer” (including in Paragraph 3) includes Energy Recovery, Inc. and any corporations related to or affiliated with Energy Recovery, Inc., whether as a parent, subsidiary or an affiliate

June 10, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 6, 2024 (June 6, 2024) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (

May 29, 2024 EX-1.01

Conflict Minerals Report, as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 Energy Recovery Inc. Conflict Minerals Report For The Calendar Year Ended December 31, 2023 Introduction For the year ended December 31, 2023, Energy Recovery, Inc. (the “Company”, “Energy Recovery”, “our”, “us”, or “we”), in good faith, has conducted a reasonable country of origin inquiry (“RCOI”) of our products using the Responsible Minerals Initiative’s (“RMI”) Conflict Minerals R

May 29, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 (State or other jurisdiction of incorporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 (State or other jurisdiction of incorporation) (Commission File Number) 1717 Doolittle Drive, San Leandro, California 94577 (Address of principal executive offices) (Zip Code) Joshua Ballard (51

May 1, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 1, 2024 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

May 1, 2024 EX-99.1

Energy Recovery Reports its First Quarter 2024 Financial Results

Exhibit 99.1 Energy Recovery Reports its First Quarter 2024 Financial Results SAN LEANDRO, Calif. - May 1, 2024 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the first quarter ended March 31, 2024. First Quarter Highlights •Revenue of $12.1 million, which is in-line with our February 2024 guidance. •Gross margin of 59.0%, a dec

May 1, 2024 10-Q

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Reco

April 22, 2024 DEF 14A

DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐Preliminary Proxy Statement ☐Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒Definitive Proxy Statemen

April 22, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 22, 2024 (April 22, 2024) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporatio

February 21, 2024 EX-99.1

Energy Recovery Announces CFO Transition

Exhibit 99.1 Energy Recovery Announces CFO Transition SAN LEANDRO, Calif. — February 21, 2024 — Energy Recovery, Inc. (Nasdaq: ERII), a trusted global leader in energy efficiency technology, today announced Joshua Ballard has made the decision to step down from his position as Chief Financial Officer at the end of June 2024. A search to identify Energy Recovery’s next CFO is underway with the exec

February 21, 2024 EX-10.13

Energy Recovery, Inc. 2020 Incentive Plan and Forms of Award Agreements.

Exhibit 10.13 ENERGY RECOVERY, INC. 2020 INCENTIVE PLAN SECTION 1. PURPOSE The purpose of the Energy Recovery, Inc. 2020 Incentive Plan is to promote the long-term success of the Company and the creation of stockholder value by (a) encouraging employees, officers, directors, consultants, agents, advisors and independent contractors of the Company and its Related Companies to focus on critical long

February 21, 2024 EX-99.1

Energy Recovery Reports Record Full Year and Fourth Quarter Revenue for 2023

Exhibit 99.1 Energy Recovery Reports Record Full Year and Fourth Quarter Revenue for 2023 SAN LEANDRO, Calif. - February 21, 2024 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the fourth quarter and year ended December 31, 2023. Fiscal Year 2023 Highlights •Record annual revenue of $128.3 million, which includes a 79% growth in

February 21, 2024 EX-21.1

List of subsidiaries of the Company.

Exhibit 21.1 Energy Recovery, Inc. LIST OF REGISTRANT'S SUBSIDIARIES Subsidiaries of Registrant (All 100% Owned) Country/State of Incorporation/Formation Energy Recovery Iberia, S.L. Spain Energy Recovery Canada, Corp. Canada

February 21, 2024 EX-97.1

Energy Recovery, Inc. Compensation Recovery ("Clawback") Policy dated

Exhibit 97.1 ENERGY RECOVERY, INC. COMPENSATION RECOVERY POLICY (effective July 25, 2023) TABLE OF CONTENTS Page 1. Purpose 1 2. Requirement to Recover Compensation 1 3. Definitions 1 4. Exceptions 3 5. Manner of Recovery 4 6. Other Provision 5 7. Other Recovery Rights 5 Compensation Recovery Policy 1.Purpose. In accordance with the applicable rules of the Nasdaq Stock Market (the “Nasdaq”) and Se

February 21, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 21, 2024 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

February 21, 2024 10-K

Management’s Role Managing Risk

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recovery

February 21, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 21, 2024 (February 21, 2024) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorp

February 14, 2024 SC 13G

ERII / Energy Recovery, Inc. / BROWN CAPITAL MANAGEMENT LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (AMENDMENT NO. 0)* Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 Par Value (Title of Class of Securities) 29270J100 (CUSIP Number) Eddie C. Brown Brown Capital

February 13, 2024 SC 13G

ERII / Energy Recovery, Inc. / VANGUARD GROUP INC - SCHEDULE 13G Passive Investment

SC 13G 1 tv0842-energyrecoveryinc.htm SCHEDULE 13G SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 Name of issuer: Energy Recovery Inc Title of Class of Securities: Common Stock CUSIP Number: 29270J100 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to

February 9, 2024 SC 13G/A

ERII / Energy Recovery, Inc. / Trigran Investments, Inc. - SC 13G/A Passive Investment

SC 13G/A 1 tm243940d6sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 Under the Securities Exchange Act of 1934 (Amendment No. 1)* ENERGY RECOVERY, INC. (Name of Issuer) Common Stock, Par Value of $0.001 Per Share (Title of Class of Securities) 29270J100 (CUSIP Number) December 31,

February 9, 2024 EX-1

EXHIBIT 1: Agreement to Make a Joint Filing

EX-1 2 tm243940d6ex1.htm EXHIBIT 1 CUSIP No. 29270J100 Schedule 13G Page 1 of 1 Exhibit 1 EXHIBIT 1 TO SCHEDULE 13G February 9, 2024 In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, TRIGRAN INVESTMENTS, INC., DOUGLAS GRANAT, LAWRENCE A. OBERMAN, STEVEN G. SIMON, BRADLEY F. SIMON and STEVEN R. MONIESON each hereby agree to the joint filing of this statement

January 31, 2024 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): January 31, 2024 (January 16, 2024) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorp

January 31, 2024 EX-10.1

Offer Letter to Mr. David W. Moon, as President and CEO.

Exhibit 10.1 January 25, 2024 David W. Moon 1717 Doolittle Drive San Leandro, CA 94577 Re: Offer of Employment with Energy Recovery, Inc., as President and Chief Executive Officer Dear David; On behalf of the Board of Directors of Energy Recovery, Inc (“ERII” or the “Company), I am pleased to confirm your appointment to the position of President and Chief Executive Officer of ERII, reporting to th

January 22, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 22, 2024 (January 16, 202

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 22, 2024 (January 16, 2024) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorpor

January 22, 2024 EX-99.1

Energy Recovery Appoints David Moon as President and CEO

Exhibit 99.1 Energy Recovery Appoints David Moon as President and CEO SAN LEANDRO, Calif. — January 22, 2024 — Energy Recovery, Inc. (Nasdaq: ERII), a trusted global leader in energy efficiency technology, today announced David Moon has been named President and Chief Executive Officer of the Company. Mr. Moon has served as interim President and CEO since October 2023 and will continue serving on t

November 1, 2023 EX-99.1

Energy Recovery Achieves 22% Year-on-Year Quarterly Revenue Growth, Beating Guidance

Exhibit 99.1 Energy Recovery Achieves 22% Year-on-Year Quarterly Revenue Growth, Beating Guidance SAN LEANDRO, Calif. - November 1, 2023 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the third quarter and nine months ended September 30, 2023. Third Quarter Highlights •Revenue of $37.0 million, exceeding the upper end of our gui

November 1, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 ☐ TRANSITION REPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energ

November 1, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 1, 2023 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 1, 2023 EX-10.1

Recovery, Inc. as Borrower, and JPMorgan Chase Bank N.A. as Lender dated

EXECUTION VERSION 756400675 SECOND AMENDMENT TO CREDIT AGREEMENT THIS SECOND AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), dated as of September 11, 2023, is entered into by and among ENERGY RECOVERY, INC.

October 27, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 27, 2023 (October 23, 2023) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorpor

October 27, 2023 EX-10.1

estricted Stock Unit Grant Notice and Restricted Stock Unit Agreement

Exhibit 10.1 ENERGY RECOVERY, INC. 2020 INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT NOTICE AND RESTRICTED STOCK UNIT AGREEMENT Energy Recovery, Inc., a Delaware corporation (the “Company”), pursuant to its 2020 Incentive Plan (the “Plan”), hereby grants to the individual listed below (the “Grantee”) an Award for the number of Restricted Stock Units set forth below. This Award of Restricted Stock Un

October 24, 2023 EX-99.1

Energy Recovery Announces Leadership Transition Appoints David Moon Interim CEO

Exhibit 99.1 Energy Recovery Announces Leadership Transition Appoints David Moon Interim CEO SAN LEANDRO, Calif. — October 24, 2023 — Energy Recovery, Inc. (NASDAQ: ERII) today announced Mr. David Moon, a current member of the Energy Recovery Board of Directors, has been appointed interim Chief Executive Officer, effective immediately. Mr. Bob Mao will remain a member of the Board, and Ms. Pamela

October 24, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 24, 2024 (October 23, 2023) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorpor

October 20, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 10, 2023 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

October 20, 2023 EX-99.1

Energy Recovery Announces Appointment of Refrigeration, Water Executives to Board of Directors

Exhibit 99.1 Energy Recovery Announces Appointment of Refrigeration, Water Executives to Board of Directors SAN LEANDRO, Calif. — July 10, 2023 — Energy Recovery, Inc. (NASDAQ: ERII) today announced the appointment of refrigeration executive David Moon and water solutions leader Colin Sabol to its Board of Directors. “Mr. Moon and Mr. Sabol’s extensive expertise in their respective fields will be

August 2, 2023 EX-99.1

Energy Recovery Affirms FY 2023 Guidance, Continues Investments in Wastewater and CO2 Business Growth

Exhibit 99.1 Energy Recovery Affirms FY 2023 Guidance, Continues Investments in Wastewater and CO2 Business Growth SAN LEANDRO, Calif. - August 2, 2023 – Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the second quarter and six months ended June 30, 2023. Second Quarter Highlights •Revenue of $20.7 million, within the lower end of

August 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 2, 2023 Energy Recovery, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 2, 2023 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 2, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Rec

June 12, 2023 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 8, 2023 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

May 23, 2023 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 (State or other jurisdiction of incorporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 (State or other jurisdiction of incorporation) (Commission File Number) 1717 Doolittle Drive, San Leandro, California 94577 (Address of principal executive offices) (Zip Code) William Yeung (510

May 23, 2023 EX-1.01

Conflict Minerals Report, as required by Items 1.01 and 1.02 of this Form

U.S. Securities and Exchange Commission You’ve Exceeded the SEC’s Traffic Limit Your request rate has exceeded the SEC’s maximum allowable requests per second. Your access to SEC.gov will be limited for 10 minutes. Current guidelines limit each user to a total of no more than 10 requests per second, regardless of the number of machines used to submit requests. To ensure that SEC.gov remains

May 3, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2023 Energy Recovery, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2023 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

May 3, 2023 EX-99.1

Energy Recovery Reports First Quarter 2023 Financial Results

Exhibit 99.1 Energy Recovery Reports First Quarter 2023 Financial Results SAN LEANDRO, Calif. - May 3, 2023 - Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the first quarter ended March 31, 2023. First Quarter Highlights •Revenue of $13.4 million, and within February 2023 guidance. •Lower gross margin of 60.9%, as compared to Q1’

May 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 ☐ TRANSITION REPORT P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Re

April 24, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 19, 2023 ENERGY RECOVERY, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 19, 2023 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

April 24, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy State

February 22, 2023 EX-99.1

Energy Recovery Reports Record Q4 Revenue, 75% Annual Earnings Per Share Growth

Exhibit 99.1 Energy Recovery Reports Record Q4 Revenue, 75% Annual Earnings Per Share Growth SAN LEANDRO, Calif. - February 22, 2023 - Energy Recovery, Inc. (Nasdaq:ERII) (“Energy Recovery” or the “Company”) today announced its financial results for the fourth quarter ended December 31, 2022. Fiscal Year 2022 Highlights •Revenue growth of 21% over the prior year and within the November 2022 guidan

February 22, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUAN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recovery

February 22, 2023 EX-21.1

List of subsidiaries of the Company.

Exhibit 21.1 Energy Recovery, Inc. LIST OF REGISTRANT'S SUBSIDIARIES Subsidiaries of Registrant (All 100% Owned) Country/State of Incorporation/Formation Energy Recovery Iberia, S.L. Spain Energy Recovery Canada, Corp. Canada

February 22, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 22, 2023 Energy Recovery

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 22, 2023 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

February 10, 2023 SC 13G

ERII / Energy Recovery, Inc. / Trigran Investments, Inc. - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 Under the Securities Exchange Act of 1934 (Amendment No.)* ENERGY RECOVERY, INC. (Name of Issuer) Common Stock, Par Value of $0.001 Per Share (Title of Class of Securities) 29270J100 (CUSIP Number) December 31, 2022 Date of Event Which Requires Filing of

February 10, 2023 EX-99.1

February 10, 2023

CUSIP No. 29270J100 Schedule 13G Page 1 of 1 Exhibit 1 EXHIBIT 1 TO SCHEDULE 13G February 10, 2023 In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, TRIGRAN INVESTMENTS, INC., DOUGLAS GRANAT, LAWRENCE A. OBERMAN, STEVEN G. SIMON, BRADLEY F. SIMON and STEVEN R. MONIESON each hereby agree to the joint filing of this statement on Schedule 13G (including any an

November 2, 2022 EX-99.1

Energy Recovery Reports 47% Quarterly Product Revenue Growth in Third Quarter

Exhibit 99.1 Energy Recovery Reports 47% Quarterly Product Revenue Growth in Third Quarter SAN LEANDRO, Calif. - November 2, 2022 - Energy Recovery, Inc. (Nasdaq:ERII) (?Energy Recovery? or the ?Company?) today announced its financial results for the third quarter ended September 30, 2022. Third Quarter Highlights: ?Revenue of $30.5 million. Full year revenue guidance of $121?$125 million, or 16%?

November 2, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2022 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 2, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 ☐ TRANSITION REPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energ

September 12, 2022 S-3ASR

As filed with the Securities and Exchange Commission on September 12, 2022

As filed with the Securities and Exchange Commission on September 12, 2022 Registration No.

September 12, 2022 EX-4.2

Form of Senior Indenture

Exhibit 4.2 ENERGY RECOVERY, INC., as the Company and [?], as Trustee Senior Indenture Dated as of [?] 1 ENERGY RECOVERY, INC. Reconciliation and tie between Trust Indenture Act of 1939 and Senior Indenture TRUST INDENTURE ACT SECTION INDENTURE SECTION Section 310 (a) (1) 7.11 (a) (2) 7.11 (b) 7.03 Section 311 7.03 Section 312 (a) 4.03 (b) 10.01 Section 313 (a) 7.06 Section 314 (a) (1), (2), (3) 4

September 12, 2022 EX-FILING FEES

Calculation of Filing Fees Table

Exhibit 107 Calculation of Filing Fees Table Form S-3 (Form Type) Energy Recovery, Inc.

September 12, 2022 EX-4.3

Form of Subordinated Indenture

Exhibit 4.3 ENERGY RECOVERY, INC., as the Company and [?], as Trustee Subordinated Indenture Dated as of [?] 1 ENERGY RECOVERY, INC. Reconciliation and tie between Trust Indenture Act of 1939 and Subordinated Indenture TRUST INDENTURE ACT SECTION INDENTURE SECTION Section 310 (a) (1) 7.11 (a) (2) 7.11 (b) 7.03 Section 311 7.03 Section 312 (a) 4.03 (b) 10.01 Section 313 (a) 7.06 Section 314 (a) (1)

August 24, 2022 CORRESP

Appendix A

Energy Recovery, Inc. 1717 Doolittle Drive San Leandro, CA 94577 Phone: (510) 483-7370 VIA EDGAR SUBMISSION August 24, 2022 United States Securities and Exchange Commission Division of Corporation Finance Office of Real Estate & Construction 100 F Street, N.E. Washington, D.C. 20549 Attn: William Demarest Kristi Marrone Re: Energy Recovery, Inc. Form 10-K for the Year Ended December 31, 2021 Form

August 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2022 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Rec

August 3, 2022 EX-99.1

Energy Recovery Announces Second Quarter 2022 Financial Results and Commissioning of the First PX G1300™ for CO2 Refrigeration

Exhibit 99.1 Energy Recovery Announces Second Quarter 2022 Financial Results and Commissioning of the First PX G1300? for CO2 Refrigeration SAN LEANDRO, Calif. - August 3, 2022 - Energy Recovery, Inc. (Nasdaq:ERII) (?Energy Recovery? or the ?Company?) today announced its financial results for the second quarter ended June 30, 2022. Second Quarter Highlights: ?Revenue of $20.3 million, as guided in

August 3, 2022 EX-10.1

First Amendment to the Credit Agreement by and between Energy Recovery,

748030822 FIRST AMENDMENT TO CREDIT AGREEMENT THIS FIRST AMENDMENT TO CREDIT AGREEMENT (this ?Amendment?), dated as of July 15, 2022, is entered into by and among ENERGY RECOVERY, INC.

June 10, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 9, 2022 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

June 3, 2022 DEFR14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1) Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

May 27, 2022 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 01-0616867 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 1717 Doolittle Drive, San Leandro, California 94577 (Address of principal exe

May 27, 2022 EX-1.01

Conflict Minerals Report, as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 Energy Recovery Inc. Conflict Minerals Report For The Calendar Year Ended December 31, 2021 Introduction For the year ended December 31, 2021, Energy Recovery, Inc. (the ?Company?, ?Energy Recovery?, ?our?, ?us?, or ?we?), in good faith, has conducted a reasonable country of origin inquiry (?RCOI?) of our products using the Responsible Minerals Initiative?s (?RMI?) Conflict Minerals R

May 4, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 4, 2022 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

May 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 ☐ TRANSITION REPORT P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Re

May 4, 2022 EX-99.1

Energy Recovery Achieves Record-Breaking First Quarter 2022 Revenue

Exhibit 99.1 Energy Recovery Achieves Record-Breaking First Quarter 2022 Revenue SAN LEANDRO, Calif. - May 4, 2022 - Energy Recovery, Inc. (Nasdaq:ERII) (?Energy Recovery? or the ?Company?) today announced its financial results for the first quarter ended March 31, 2022. News Summary ?Revenue of $32.5 million, an increase of 12% year-over-year (?YoY?). ?Income from operations of $8.2 million, an i

April 25, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

March 9, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 7, 2022 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

February 24, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 24, 2022 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

February 24, 2022 EX-4.1

Description of Securities.

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT?S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Energy Recovery, Inc. (the ?Company?, ?Energy Recovery?, ?we?, ?our? and ?us?) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?): our common stock. General Energy Recovery is authorized to issue

February 24, 2022 EX-21.1

List of subsidiaries of the Company.

Exhibit 21.1 Energy Recovery, Inc. LIST OF REGISTRANT'S SUBSIDIARIES Subsidiaries of Registrant (All 100% Owned) Country/State of Incorporation/Formation Energy Recovery Iberia, S.L. Spain Energy Recovery Canada, Corp. Canada

February 24, 2022 EX-99.1

Energy Recovery Achieves Record-Breaking Fourth Quarter and Fiscal Year 2021 Product Revenue

Exhibit 99.1 Energy Recovery Achieves Record-Breaking Fourth Quarter and Fiscal Year 2021 Product Revenue SAN LEANDRO, Calif. - February 24, 2022 - Energy Recovery, Inc. (Nasdaq:ERII) today announced its financial results for the fourth quarter and fiscal year ended December 31, 2021. The Company achieved 13% product revenue growth for the fiscal year 2021 across all business segments. ?We are ple

February 24, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ☐ TRANSITION REPORT PURSUAN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recovery

February 10, 2022 SC 13G/A

ERII / Energy Recovery, Inc. / Trigran Investments, Inc. - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 Under the Securities Exchange Act of 1934 (Amendment No. 4)* ENERGY RECOVERY, INC. (Name of Issuer) Common Stock, Par Value of $0.001 Per Share (Title of Class of Securities) 29270J100 (CUSIP Number) December 31, 2021 Date of Event Which Requires Filing

February 10, 2022 EX-1

February 10, 2022

CUSIP No. 69291A100 Schedule 13G Page 1 of 1 Exhibit 1 EXHIBIT 1 TO SCHEDULE 13G February 10, 2022 In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, TRIGRAN INVESTMENTS, INC., DOUGLAS GRANAT, LAWRENCE A. OBERMAN, STEVEN G. SIMON, BRADLEY F. SIMON and STEVEN R. MONIESON each hereby agree to the joint filing of this statement on Schedule 13G (including any an

January 6, 2022 EX-10.1

Credit Agreement by and between Energy Recovery, Inc. as Borrower, and

EXECUTION VERSION 743955026 CREDIT AGREEMENT dated as of December 22, 2021 among ENERGY RECOVERY, INC.

January 6, 2022 8-K

Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 22, 2021 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

December 20, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 17, 2021 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

December 20, 2021 EX-99.1

Joan Chow Joins Energy Recovery Board of Directors

Exhibit 99.1 Joan Chow Joins Energy Recovery Board of Directors SAN LEANDRO, Calif. ? December 20, 2021 ? Energy Recovery,?Inc. (NASDAQ: ERII) today announced the appointment of Joan Chow to its Board of Directors. ?We are delighted to have Ms. Chow join our board, who brings years of experience as an executive and corporate director in multiple industries,? said Robert Mao, Chairman of the Board,

December 9, 2021 SC 13G

ERII / Energy Recovery, Inc. / Skaugen Marius Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) October 18, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant

December 2, 2021 EX-2

PLEDGE AGREEMENT dated 7 SEPTEMBER 2021 SOBRAL AS as Pledgor DNB BANK ASA as Pledgee relating to a custody account, a cash account and shares recorded in the custody account

PLEDGE AGREEMENT dated 7 SEPTEMBER 2021 between SOBRAL AS as Pledgor and DNB BANK ASA as Pledgee relating to a custody account, a cash account and shares recorded in the custody account CUSIP No.

December 2, 2021 EX-1

AMENDMENT AND RESTATEMENT AGREEMENT to the AGREEMENT ON SECURITIES FINANCING FOR NON-RETAIL CUSTOMERS This agreement (“Amendment Agreement”) is entered into as of 07.09.2021 between Ludvig Lorentzen AS (the “Borrower”), company registration number 99

AMENDMENT AND RESTATEMENT AGREEMENT to the AGREEMENT ON SECURITIES FINANCING FOR NON-RETAIL CUSTOMERS This agreement (?Amendment Agreement?) is entered into as of 07.

December 2, 2021 SC 13D/A

ERII / Energy Recovery, Inc. / Lorentzen Ole Peter Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 7) Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) P. Rupert Russell, Esq. Shartsis Friese LLP One Maritime Plaza San Francisco, CA 94111 (415) 421-6500 (Name, Address and Telephon

November 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ☐ TRANSITION REPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energ

November 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 4, 2021 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 4, 2021 EX-99.1

Energy Recovery Reports Third Quarter Financial Results

Exhibit 99.1 Energy Recovery Reports Third Quarter Financial Results SAN LEANDRO, Calif. - November 4, 2021 - Energy Recovery, Inc. (Nasdaq: ERII) today announced its financial results for the third quarter ended September 30, 2021. ?2021 is playing out as expected, and we are well positioned to end the year in record fashion. Our desalination business continues to demonstrate strength, and we are

October 29, 2021 SC 13G/A

ERII / Energy Recovery, Inc. / Arvarius AS Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) October 18, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuan

September 24, 2021 SC 13D/A

ERII / Energy Recovery, Inc. / Lorentzen Ole Peter Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 6) Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) P. Rupert Russell, Esq. Shartsis Friese LLP One Maritime Plaza San Francisco, CA 94111 (415) 421-6500 (Name, Address and Telephon

September 20, 2021 EX-99.1

Lisa Pollina Joins Energy Recovery Board of Directors

Exhibit 99.1 Lisa Pollina Joins Energy Recovery Board of Directors SAN LEANDRO, Calif. ? September 20, 2021 ? Energy Recovery,?Inc. (NASDAQ: ERII) today announced the appointment of Lisa Pollina to its Board of Directors. ?Ms. Pollina?s deep expertise in banking and capital markets, and her extensive leadership experience in many other forums, will be a tremendous asset as we pursue our strategy o

September 20, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 16, 2021 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commissio

August 6, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Rec

August 6, 2021 EX-3.1

Amended and Restated Certificate of Incorporation, dated June

Exhibit 3.1 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ENERGY RECOVERY, INC. Energy Recovery, Inc., a corporation organized and existing under the laws of the State of Delaware (the ?Corporation?), hereby certifies as follows: A. The name of this corporation is Energy Recovery, Inc. The Corporation?s original Certificate of Incorporation was filed with the Secretary of State of the State

August 5, 2021 EX-99.1

Energy Recovery Posts Strong Quarterly Product Revenue Growth in Second Quarter

Exhibit 99.1 Energy Recovery Posts Strong Quarterly Product Revenue Growth in Second Quarter SAN LEANDRO, Calif. - August 5, 2021 - Energy Recovery, Inc. (Nasdaq: ERII) today announced its financial results for the second quarter ended June 30, 2021, achieving seven percent growth in product revenue, compared to the second quarter of 2020. ?Our desalination business continues to thrive, driven in

August 5, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2021 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

June 11, 2021 EX-3.1

Amended and Restated Certificate of Incorporation of Energy Recovery, Inc.

Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ENERGY RECOVERY, INC. June 10, 2021 Energy Recovery, Inc. (the ?Corporation?), a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the ?DGCL?), does hereby certify: FIRST: That the name of the Corporation is Energy Recovery, Inc. The origina

June 11, 2021 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 10, 2021 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

May 25, 2021 EX-1.01

Conflict Minerals Report, as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 Energy Recovery Inc. Conflict Minerals Report For The Calendar Year Ended December 31, 2020 Introduction For the year ended December 31, 2020, Energy Recovery, Inc. (the ?Company?, ?Energy Recovery?, ?our?, ?us?, or ?we?) in good faith, has conducted a reasonable country of origin inquiry (?RCOI?) of our products using the Responsible Minerals Initiative?s (?RMI?) Conflict Minerals Re

May 25, 2021 DEFR14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Amendment No. 1) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Amendment No. 1) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant? Filed by a party other than the Registrant? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defini

May 25, 2021 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 01-0616867 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 1717 Doolittle Drive, San Leandro, California 94577 (Address of principal exe

May 17, 2021 EX-99.1

JOINT FILING AGREEMENT

Exhibit 99.1 JOINT FILING AGREEMENT We, the undersigned, hereby express our agreement that the attached Schedule 13G dated March 17, 2021 relating to the common stock, par value $0.001 per share, of Energy Recovery, Inc. is filed on behalf of each of us. Dated: May 12, 2021 Sundt AS By: /s/ Jakob Iqbal Name: Jakob Iqbal Title: Chief Executive Officer CGS Holdings AS By: /s/ Jakob Iqbal Name: Jakob

May 17, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2) * Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) (C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2) * Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) March 15, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant

May 7, 2021 10-Q

Quarterly Report - FORM 10-Q - Q1'2021

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Re

May 6, 2021 EX-99.1

Energy Recovery Sets Product Revenue Record in the First Quarter

Exhibit 99.1 Energy Recovery Sets Product Revenue Record in the First Quarter SAN LEANDRO, Calif. - May 6, 2021 - Energy Recovery, Inc. (Nasdaq: ERII) today announced its financial results for the first quarter ended March 31, 2021. The Company posted record-high quarterly product revenue in its core Water segment with 52% growth compared to the first quarter of 2020. “Today, Energy Recovery is at

May 6, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2021 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

May 4, 2021 144/A

- FORM 144

UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0101 Washington, D.

May 3, 2021 144

- FORM 144

UNITED STATES OMB APPROVAL SECURITIES AND EXCHANGE COMMISSION OMB Number: 3235-0101 Washington, D.

April 26, 2021 DEFA14A

- FORM DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

April 26, 2021 DEF 14A

- FORM DEF 14A

DEF 14A 1 erii20210421def14a.htm FORM DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant☒ Filed by a party other than the Registrant☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission On

April 16, 2021 EX-3.1

Amended and Restated Bylaws, effective as of April 14, 2021.

EXHIBIT 3.1 AMENDED AND RESTATED BYLAWS OF ENERGY RECOVERY, INC. (Amended and Restated effective as of April 14, 2021) ARTICLE I?CORPORATE OFFICES 1.1 REGISTERED OFFICE. The registered office of Energy Recovery, Inc. shall be fixed in the corporation?s certificate of incorporation, as the same may be amended and/or restated from time to time (as so amended and/or restated, the ?Certificate?). 1.2

April 16, 2021 PRE 14A

- FORM PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant? Filed by a party other than the Registrant? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy Stateme

April 16, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 14, 2021 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

April 16, 2021 EX-3.2

Form of Certificate of Amendment to the Amended and Restated Certificate of Incorporation of Energy Recovery, Inc.

EXHIBIT 3.2 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF ENERGY RECOVERY, INC. [?], 2021 Energy Recovery, Inc. (the ?Corporation?), a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the ?DGCL?), does hereby certify: FIRST: That the name of the Corporation is Energy Recovery, Inc. The original ce

March 31, 2021 S-8

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Energy Recovery, Inc. (Exact name of registrant as specified in its charter) Delaware 01-0616867 (State or other

As filed with the Securities and Exchange Commission on March 31, 2021 Registration No.

March 31, 2021 S-8 POS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-212707 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Energy Recovery, Inc. (Exact nam

As filed with the Securities and Exchange Commission on March 31, 2021 Registration No.

March 24, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 24, 2021 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

March 24, 2021 EX-99.1

NASDAQ: ERII Driving Industrial Sustainability Delivering Value in Fluid‐Flow Processes Energy Recovery Investor Presentation – March 2021 Confidential & Proprietary FORWARD LOOKING STATEMENT This presentation contains forward‐looking statements with

NASDAQ: ERII Driving Industrial Sustainability Delivering Value in Fluid?Flow Processes Energy Recovery Investor Presentation ? March 2021 Confidential & Proprietary FORWARD LOOKING STATEMENT This presentation contains forward?looking statements within the ?Safe Harbor? provisions of the Private Securities Litigation Reform Act of 1995.

March 12, 2021 EX-21.1

List of subsidiaries of the Company.

Exhibit 21.1 Energy Recovery, Inc. List of Subsidiaries Company Name Country/State of Incorporation/Formation ERI Energy Recovery Ireland Limited Ireland Energy Recovery Iberia, S.L. Spain Energy Recovery Canada, Corp. Canada

March 12, 2021 EX-4.1

Description of Securities.

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT?S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Energy Recovery, Inc. (the ?Company?, ?Energy Recovery?, ?we?, ?our? and ?us?) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?): our common stock. General Energy Recovery is authorized to issue

March 12, 2021 10-K

Annual Report - FORM 10-K FY2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recovery

March 11, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 11, 2021 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

March 11, 2021 EX-99.1

Energy Recovery Reports Product Revenue Growth of 26% for Fiscal Year 2020 $50 million Share Buyback Program Announced

Energy Recovery Reports Product Revenue Growth of 26% for Fiscal Year 2020 $50 million Share Buyback Program Announced SAN LEANDRO, Calif.

February 11, 2021 SC 13G/A

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 Under the Securities Exchange Act of 1934 (Amendment No. 3)* ENERGY RECOVERY, INC. (Name of Issuer) Common Stock, Par Value of $0.001 Per Share (Title of Class of Securities) 29270J100 (CUSIP Number) December 31, 2020 Date of Event Which Requires Filing

February 11, 2021 EX-99.1

February 11, 2021

Exhibit 1 EXHIBIT 1 TO SCHEDULE 13G February 11, 2021 In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, TRIGRAN INVESTMENTS, INC.

February 10, 2021 EX-10.1

Energy Recovery, Inc. Severance Plan

Exhibit 10.1 ENERGY RECOVERY, INC. SEVERANCE PLAN Effective as of February 5, 2021 (the “Effective Date”), Energy Recovery, Inc. (“Plan Sponsor”) hereby establishes a welfare benefits plan known as the “Energy Recovery, Inc. Severance Plan” (this or the “Plan”) for the benefit of certain key members of management or highly compensated employees of participating employers. This Plan is hereby estab

February 10, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K 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 5, 2021 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 23, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits - FORM 8-K - ITEM 7.01 (MANAGEMENT PRESENTATION - NOVEMBER 2020)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 23, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 23, 2020 EX-99.1

Exhibit 99.1 Driving Industrial Sustainability Delivering Value in Fluid-Flow Processes November 24, 2020 Joshua Ballard, Chief Financial Officer, Energy Recovery NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward-looking state

fearnleysecuritiesannual Exhibit 99.1 Driving Industrial Sustainability Delivering Value in Fluid-Flow Processes November 24, 2020 Joshua Ballard, Chief Financial Officer, Energy Recovery NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward-looking statements within the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements

October 30, 2020 10-Q

Quarterly Report - FORM 10-Q - Q3'2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy

October 29, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - FORM 8-K - EARNINGS RELEASE (Q3'2020)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 29, 2020 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

October 29, 2020 EX-99.1

Energy Recovery Reports Third Quarter Financial Results

Exhibit 99.1 Energy Recovery Reports Third Quarter Financial Results San Leandro, Calif., October 29, 2020 - Energy Recovery Inc. (Nasdaq: ERII) (“Energy Recovery,” “we,” “our,” or the “Company”), a leader in pressure energy technology for industrial fluid flows, today announced its financial results for the third quarter ended September 30, 2020. Third Quarter 2020 Highlights: • Product revenue o

August 18, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 17, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission F

August 18, 2020 EX-99.1

Exhibit 99.1 Energy Recovery Investor Presentation August 2020 NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward‐looking statements within the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. F

ex991-investorpresentati Exhibit 99.1 Energy Recovery Investor Presentation August 2020 NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward‐looking statements within the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward‐looking statements in this report include, but are not limited to, statements about our expectations, objectives, anti

August 4, 2020 SC 13G/A

ERII / Energy Recovery, Inc. / Trigran Investments, Inc. - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 Under the Securities Exchange Act of 1934 (Amendment No. 2)* Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) July 31, 2020 Date of Event Which Requires Filing of the Statement

July 31, 2020 EX-99.1

Energy Recovery Reports Second Quarter Financial Results

Exhibit 99.1 Energy Recovery Reports Second Quarter Financial Results San Leandro, Calif., July 30, 2020 - Energy Recovery Inc. (Nasdaq: ERII) (“Energy Recovery,” “we,” “our,” or the “Company”), a leader in pressure energy technology for industrial fluid flows, today announced its financial results for the second quarter ended June 30, 2020. Second Quarter 2020 Highlights: • Product revenue of $19

July 31, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - FORM 8-K - EARNINGS RELEASE (Q2'2020)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 30, 2020 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

July 31, 2020 10-Q

Quarterly Report - FORM 10-Q - Q2'2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Rec

July 20, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 16, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

June 30, 2020 EX-99.1

Energy Recovery Announces Exit From VorTeq™ Exclusive Licensing Agreement with Schlumberger

Exhibit 99.1 Energy Recovery Announces Exit From VorTeq™ Exclusive Licensing Agreement with Schlumberger SAN LEANDRO, Calif. — June 29, 2020 — Energy Recovery, Inc. (NASDAQ: ERII) today announced an agreement with Schlumberger to exit its 15-year licensing deal for Schlumberger’s exclusive use of Energy Recovery’s VorTeq hydraulic pumping system. Under the terms of the new agreement, no further pa

June 30, 2020 EX-99.1

Exhibit 99.1 Energy Recovery Investor Presentation June 2020 NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward‐looking statements within the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. For

ex991-investorpresentati Exhibit 99.1 Energy Recovery Investor Presentation June 2020 NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward‐looking statements within the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward‐looking statements in this report include, but are not limited to, statements about our expectations, objectives, antici

June 30, 2020 EX-10.1

Termination Agreement and Release, dated as of June 24, 2020, by and between ERI Energy Recovery Ireland Ltd.

exhibit101eri-slbtermina DocuSign Envelope ID: A9F6E60A-8D85-4B48-A0FC-584EEF4833C1DD048246-0EAB-4A31-8939-4A6C52072F3E Exhibit 10.

June 30, 2020 8-K/A

Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Financial Statements and Exhibits

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): June 24, 2020 (October 14, 2015) ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorpora

June 30, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 29, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

June 10, 2020 10-K/A

Annual Report - FORM 10-K/A FY2019

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K/A (Amendment No. 1) (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-3

June 4, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 3, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

June 4, 2020 EX-99.1

Exhibit 99.1 Energy Recovery Investor Presentation June 2020 NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward-looking statements within the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. For

investorpresentationxju Exhibit 99.1 Energy Recovery Investor Presentation June 2020 NASDAQ: ERII FORWARD LOOKING STATEMENT This presentation contains forward-looking statements within the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements in this report include, but are not limited to, statements about our expectations, objectives, anticip

May 29, 2020 SD

- FORM SD - SPECIALIZED DISCLOSURE REPORT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report ENERGY RECOVERY, INC. (Exact name of registrant as specified in its charter) Delaware 001-34112 01-0616867 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 1717 Doolittle Drive, San Leandro, California 94577 (Address of principal exe

May 29, 2020 DEF 14A

Energy Recovery, Inc. 20

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Definitive Proxy State

May 29, 2020 EX-1.01

Conflict Minerals Report, as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 Energy Recovery Inc. Conflict Minerals Report For The Calendar Year Ended December 31, 2019 Introduction For the year ended December 31, 2019, Energy Recovery, Inc. (the “Company”, “Energy Recovery”, “our”, “us”, or “we”) in good faith, has conducted a reasonable country of origin inquiry (“RCOI”) of our products using the Responsible Minerals Initiative’s (“RMI”) Conflict Minerals Re

May 22, 2020 EX-10.1

Offer of Employment with Energy Recovery, Inc., as President and Chief Executive Officer

Exhibit 10.1 May 20, 2020 Mr. Robert Yu Lang Mao 1717 Doolittle Drive San Leandro, CA 94577 Re: Offer of Employment with Energy Recovery, Inc., as President and Chief Executive Officer Dear Robert; On behalf of the Board of Directors of Energy Recovery, Inc. (“ERI” or the “Company”), I am pleased to confirm your appointment to the position of President and Chief Executive Officer of ERI, reporting

May 22, 2020 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): May 5, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

May 19, 2020 SC 13D/A

ERII / Energy Recovery, Inc. / Lorentzen Ole Peter Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 5) Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) P. Rupert Russell, Esq. Shartsis Friese LLP One Maritime Plaza San Francisco, CA 94111 (415) 421-6500 (Name, Address and Telephon

May 13, 2020 424B3

1,500,000 Shares Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-233730 PROSPECTUS SUPPLEMENT (To Prospectus dated September 27, 2019) 1,500,000 Shares Common Stock This prospectus supplement relates to the sale of 1,500,000 shares of our common stock owned by the stockholder identified in the section of this prospectus supplement titled “SELLING STOCKHOLDER.” We will not receive any procee

May 8, 2020 EX-99.1

Energy Recovery Names Robert Mao President and Chief Executive Officer Pamela Tondreau elected as Lead Independent Director

Exhibit 99.1 Energy Recovery Names Robert Mao President and Chief Executive Officer Pamela Tondreau elected as Lead Independent Director SAN LEANDRO, Calif. — May 7, 2020 — Energy Recovery, Inc. (NASDAQ: ERII) today announced that its Board of Directors (“Board”) has selected current Chairman and Interim President and CEO, Mr. Robert Yu Lang Mao, as President and CEO of Energy Recovery. Mr. Mao wi

May 8, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

May 1, 2020 EX-10.1

10, 2020, by and between Energy Recovery, Inc. and Prologis, L.P.

tracycaleaseex101

May 1, 2020 10-Q

Quarterly Report - FORM 10-Q - Q1'2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Re

April 30, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 30, 2020 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

April 30, 2020 EX-99.1

Energy Recovery Reports First Quarter Financial Results

Exhibit 99.1 Energy Recovery Reports First Quarter Financial Results San Leandro, Calif., April 30, 2020 - Energy Recovery Inc. (Nasdaq: ERII) (“Energy Recovery,” “we,” “our,” or the “Company”), a leader in pressure energy technology for industrial fluid flows, today announced its financial results for the first quarter ended March 31, 2020. First Quarter 2020 Highlights: • Total product revenue o

April 7, 2020 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 4, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

March 25, 2020 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): March 19, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

March 25, 2020 EX-10.1

Settlement Agreement and Release, dated as of

Exhibit 10.1 GENERAL RELEASE THIS GENERAL RELEASE (the “Agreement”) is made by and between Eric Siebert (“Employee”) and Energy Recovery, Inc. (“Employer”). For purposes of this Agreement, it is agreed that “Employer” includes Energy Recovery, Inc. and any corporations related to or affiliated with Energy Recovery, Inc., whether as a parent, subsidiary or an affiliate and their successors and assi

March 19, 2020 EX-99.1

Energy Recovery Announces Departure of VP, Oil & Gas, Appointment of New VorTeq™ Development Leader

Exhibit 99.1 Energy Recovery Announces Departure of VP, Oil & Gas, Appointment of New VorTeq™ Development Leader SAN LEANDRO, Calif. — March 19, 2020 — Energy Recovery, Inc. (NASDAQ:ERII) today announced the departure of the company’s Vice President of Oil & Gas, Eric Siebert. “Eric’s leadership has been integral to the development of VorTeq™ from its early stages to the advanced position we are i

March 19, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 19, 2020 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

March 6, 2020 EX-21.1

List of subsidiaries of the Company.

Exhibit 21.1 Energy Recovery, Inc. List of Subsidiaries Company Name Country/State of Incorporation/Formation ERI Energy Recovery Holdings Ireland Limited Ireland ERI Energy Recovery Ireland Limited Ireland Energy Recovery Iberia, S.L. Spain Energy Recovery Canada, Corp. Canada

March 6, 2020 10-K

Annual Report - FORM 10-K FY2019

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 Form 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Recovery

March 6, 2020 EX-4.1

Description of Securities

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Energy Recovery, Inc. (the “Company”, “Energy Recovery”, “we”, “our” and “us”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our common stock. General Energy Recovery is authorized to issue

March 5, 2020 EX-99.1

Energy Recovery Reports Fourth Quarter and Fiscal Year End 2019 Financial Results

Exhibit 99.1 Energy Recovery Reports Fourth Quarter and Fiscal Year End 2019 Financial Results San Leandro, Calif., March 5, 2020 - Energy Recovery Inc. (Nasdaq: ERII) (“Energy Recovery,” “we,” “our,” or the “Company”), a leader in pressure energy technology for industrial fluid flows, today announced its financial results for the fourth quarter and fiscal year ended December 31, 2019. Fiscal Year

March 5, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 5, 2020 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

February 12, 2020 EX-1

FEBRUARY 12, 2020

Exhibit 1 EXHIBIT 1 TO SCHEDULE 13G FEBRUARY 12, 2020 In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, TRIGRAN INVESTMENTS, INC.

February 12, 2020 SC 13G/A

ERII / Energy Recovery, Inc. / Trigran Investments, Inc. - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Information Statement Pursuant to Rules 13d-1 Under the Securities Exchange Act of 1934 (Amendment No. 1)* Energy Recovery, Inc. (Name of Issuer) Common Stock, $0.001 par value (Title of Class of Securities) 29270J100 (CUSIP Number) December 31, 2019 Date of Event Which Requires Filing of the Statem

December 16, 2019 CORRESP

ERII / Energy Recovery, Inc. CORRESP - -

Energy Recovery, Inc. 1717 Doolittle Drive San Leandro, CA 94577 Phone: (510) 483-7370 VIA EDGAR SUBMISSION December 16, 2019 Mr. Stephen Krikorian Accounting Branch Chief Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Re: Energy Recovery, Inc. Form 10-K for the Fiscal Year Ended December 31, 2018 Filed March 7, 2019, as amended on Marc

November 22, 2019 CORRESP

ERII / Energy Recovery, Inc. CORRESP - -

Energy Recovery, Inc. 1717 Doolittle Drive San Leandro, CA 94577 Phone: (510) 483-7370 VIA EDGAR SUBMISSION November 22, 2019 Ms. Laura Veator Staff Accountant Securities and Exchange Commission Division of Corporation Finance Mail Stop 4628 100 F Street, N.E. Washington, D.C. 20549 Re: Energy Recovery, Inc. Form 10-K for the Fiscal Year Ended December 31, 2018 Filed March 7, 2019, as amended on M

November 19, 2019 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): November 4, 2019 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commissio

November 19, 2019 EX-10.1

Settlement Agreement and Release, dated as of November 15, 2019, by and between Energy Recovery, Inc., and Chris Gannon

Exhibit 10.1 SETTLEMENT AGREEMENT AND RELEASE This Settlement Agreement and Release (hereinafter “Release”) is freely entered into by Chris Gannon (“Gannon”) and Energy Recovery, Inc. (“Company”). Although Gannon is not entitled to severance under his May 4, 2018 Offer of Promotion “in the event that you voluntarily resign (other than under the circumstances described in the Change in Control Seve

November 18, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 18, 2019 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 18, 2019 EX-99.1

Management Presentation.

Exhibit 99.1

November 12, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 12, 2019 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 12, 2019 EX-99.1

Management Presentation.

Exhibit 99.1

November 4, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 4, 2019 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

November 4, 2019 EX-99.1

Energy Recovery Announces Leadership Transition

Exhibit 99.1 FOR IMMEDIATE RELEASE Energy Recovery Announces Leadership Transition SAN LEANDRO, Calif. - November 4, 2019 - Energy Recovery, Inc. (NASDAQ:ERII) announced today the resignation of Chris Gannon as the Company’s President and Chief Executive Officer and as a member of its Board of Directors. Mr. Gannon submitted his resignation to the Board on Friday, November 1, effective immediately

November 1, 2019 10-Q

Quarterly Report - FORM 10-Q - Q3'19

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energ

October 31, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 31, 2019 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission

October 31, 2019 EX-99.1

Energy Recovery Reports Third Quarter 2019 Financial Results

Exhibit 99.1 Energy Recovery Reports Third Quarter 2019 Financial Results San Leandro, Calif., October 31, 2019 - Energy Recovery Inc. (Nasdaq: ERII) (“Energy Recovery” or the “Company”), the leader in pressure energy technology for industrial fluid flows, today announced its financial results for the third quarter ended on September 30, 2019. Third Quarter Summary: • Total revenue of $24.9 millio

September 26, 2019 CORRESP

ERII / Energy Recovery, Inc. CORRESP - -

ENERGY RECOVERY, INC. 1717 Doolittle Drive San Leandro, CA 94577 September 26, 2019 VIA EDGAR U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attn: Thomas Jones Re: Energy Recovery, Inc. Registration Statement on Form S-3 Filed September 12, 2019 File No. 333-233730 Ladies and Gentlemen: In accordance with Rule 461 of the Securities

September 12, 2019 EX-4.2

Form of Senior Indenture

Exhibit 4.2 ENERGY RECOVERY, INC., as the Company and [●], as Trustee Senior Indenture Dated as of [•] ENERGY RECOVERY, INC. Reconciliation and tie between Trust Indenture Act of 1939 and Senior Indenture TRUST INDENTURE ACT SECTION INDENTURE SECTION Section 310 (a) (1) 7.11 (a) (2) 7.11 (b) 7.03 Section 311 7.03 Section 312 (a) 4.03 (b) 10.01 Section 313 (a) 7.06 Section 314 (a) (1), (2), (3) 4.0

September 12, 2019 EX-4.3

Form of Subordinated Indenture

Exhibit 4.3 Energy recovery, INC., as the Company and [●], as Trustee Subordinated Indenture Dated as of [●] ENERGY RECOVERY, INC. Reconciliation and tie between Trust Indenture Act of 1939 and Subordinated Indenture TRUST INDENTURE ACT SECTION INDENTURE SECTION Section 310 (a) (1) 7.11 (a) (2) 7.11 (b) 7.03 Section 311 7.03 Section 312 (a) 4.03 (b) 10.01 Section 313 (a) 7.06 Section 314 (a) (1),

September 12, 2019 S-3

ERII / Energy Recovery, Inc. S-3 - - FORM S-3

Table of Contents As filed with the Securities and Exchange Commission on September 12, 2019 Registration No.

August 8, 2019 EX-99.1

Investor Presentation.

Exhibit 99.1

August 8, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 7, 2019 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 2, 2019 8-K

Current Report

Energy Recovery Reports Second Quarter 2019 Financial Results San Leandro, Calif., August 1, 2019 - Energy Recovery Inc. (Nasdaq: ERII) (“Energy Recovery” or the “Company”), the leader in pressure energy technology for industrial fluid flows, today announced its financial results for the second quarter ended on June 30, 2019. Second Quarter Summary: • Total revenue of $22.8 million, an increase of

August 2, 2019 EX-99.1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 1, 2019 Energy Recovery, I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 1, 2019 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fi

August 2, 2019 10-Q

June 30, 2019

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-34112 Energy Rec

August 2, 2019 EX-10.1

Sixth Amendment to Loan and Pledge Agreement by and between Energy Recovery, Inc. and Citibank N.A.

SIXTH AMENDMENT TO LOAN AND PLEDGE AGREEMENT Dated as of June 10, 2019 Reference is made to that certain Loan and Pledge Agreement dated as of January 27, 2017 (as amended, supplemented, waived or otherwise modified from time to time prior to the date hereof, the “Loan and Pledge Agreement”) between Energy Recovery, Inc.

July 31, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 30, 2019 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

July 31, 2019 EX-99.1

Pamela Tondreau Joins Energy Recovery Board of Directors

Exhibit 99.1 FOR IMMEDIATE RELEASE Pamela Tondreau Joins Energy Recovery Board of Directors SAN LEANDRO, Calif. — July 30, 2019 — Energy Recovery, Inc. (NASDAQ:ERII), the leader in pressure energy technology for industrial fluid flows, today announced the appointment of Pamela Tondreau to its Board of Directors. "We are thrilled to have Ms. Tondreau join our board. She brings nearly two decades of

June 19, 2019 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 13, 2019 ENERGY RECOVERY, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

June 13, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 13, 2019 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission Fil

June 13, 2019 EX-99.1

Annual Shareholder Presentation.

Exhibit 99.1

May 24, 2019 EX-1.01

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 Energy Recovery Inc. Conflict Minerals Report For The Calendar Year Ended December 31, 2018 Introduction For the year ended December 31, 2018, Energy Recovery, Inc. (the “Company”, “Energy Recovery”, “our”, “us”, or “we”) in good faith, has conducted a reasonable country of origin inquiry (“RCOI”) of our products using the Responsible Minerals Initiative’s (“RMI”) Conflict Minerals Re

May 24, 2019 SD

ERII / Energy Recovery, Inc. SD - - FORM SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM SD Specialized Disclosure Report Energy Recovery, Inc. (Exact name of Registrant as specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) Commission File Number (IRS Employer Identification No.) 1717 Doolittle Drive, San Leandro, CA 94577 (Address of Principal Executive Off

May 6, 2019 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2019 Energy Recovery, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-34112 01-0616867 (State or Other Jurisdiction of Incorporation) (Commission File

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