ERII

SEC source: 0001677876-25-000011 · wk-form4_1761600530.xml · nonDerivative · entry 2

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 97,369

F1 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001677876-25-000011 · wk-form4_1761600530.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 100,899

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001677876-25-000009 · wk-form4_1761170964.xml · derivative · entry 4

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 21,180

Underlying: Common Stock · 3,530 shares

Expires 2028-02-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: This employee stock option was granted on February 1, 2018. 25% of the shares fully vest on the 1st anniversary of the vesting start date; thereafter, the remaining 75%, vest 1/36th per month.

SEC source: 0001677876-25-000009 · wk-form4_1761170964.xml · nonDerivative · entry 2

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 97,369

F1 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001677876-25-000009 · wk-form4_1761170964.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 100,899

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001677876-25-000007 · wk-form4_1760733642.xml · derivative · entry 4

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 24,710

Underlying: Common Stock · 3,530 shares

Expires 2028-02-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: This employee stock option was granted on February 1, 2018. 25% of the shares fully vest on the 1st anniversary of the vesting start date; thereafter, the remaining 75%, vest 1/36th per month.

SEC source: 0001677876-25-000007 · wk-form4_1760733642.xml · nonDerivative · entry 2

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 97,369

F1 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001677876-25-000007 · wk-form4_1760733642.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 100,899

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001677876-25-000005 · wk-form4_1759871464.xml · derivative · entry 7

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 28,240

Underlying: Common Stock · 2,529 shares

Expires 2028-02-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: This employee stock option was granted on February 1, 2018. 25% of the shares fully vest on the 1st anniversary of the vesting start date; thereafter, the remaining 75%, vest 1/36th per month.

SEC source: 0001677876-25-000005 · wk-form4_1759871464.xml · derivative · entry 6

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 30,769

Underlying: Common Stock · 1,038 shares

Expires 2028-02-01

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: This employee stock option was granted on February 1, 2018. 25% of the shares fully vest on the 1st anniversary of the vesting start date; thereafter, the remaining 75%, vest 1/36th per month.

SEC source: 0001677876-25-000005 · wk-form4_1759871464.xml · nonDerivative · entry 4

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 97,369

F1 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001677876-25-000005 · wk-form4_1759871464.xml · nonDerivative · entry 3

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 99,898

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001677876-25-000005 · wk-form4_1759871464.xml · nonDerivative · entry 2

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 97,369

F1 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001677876-25-000005 · wk-form4_1759871464.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 98,407

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001677876-25-000003 · wk-form4_1758583100.xml · derivative · entry 4

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 15,454 shares

Expires 2026-06-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: 25% of the shares became vested and exercisable on the 1st anniversary of the vesting start date of 06/20/2016; Thereafter, the remaining 75%, will vest and become exercisable 1/36th per month. The options become fully vested and exercisable on 06/20/2020.

SEC source: 0001677876-25-000003 · wk-form4_1758583100.xml · nonDerivative · entry 2

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 97,369

F1 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2 · price: This amount represents the weighted average sales price of multiple trades ranging from $15 to $15.21 per share. The reporting person undertakes to provide the SEC Staff, Energy Recovery, Inc. or a shareholder of Energy Recovery, Inc. full information about the number of shares sold at each separate price upon request.

SEC source: 0001677876-25-000003 · wk-form4_1758583100.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 112,823

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001421517-25-000122 · wk-form4_1757970044.xml · derivative · entry 3

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 15,454

Underlying: Common Stock · 30,877 shares

Expires 2026-06-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: 25% of the shares became vested and exercisable on the 1st anniversary of the vesting start date of 06/20/2016; Thereafter, the remaining 75%, will vest and become exercisable 1/36th per month. The options become fully vested and exercisable on 06/20/2020.

SEC source: 0001421517-25-000122 · wk-form4_1757970044.xml · nonDerivative · entry 2

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 97,369

F1 · price: This amount represents the weighted average sales price of multiple trades ranging from $14.40 to $14.65 per share. The reporting person undertakes to provide the SEC Staff, Energy Recovery, Inc. or a shareholder of Energy Recovery, Inc. full information about the number of shares sold at each separate price upon request.

F2 · balance_after: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001421517-25-000122 · wk-form4_1757970044.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 130,923

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001421517-25-000104 · wk-form4_1753820367.xml · nonDerivative · entry 2

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 100,765

F2 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 10, 2024.

SEC source: 0001421517-25-000104 · wk-form4_1753820367.xml · nonDerivative · entry 1

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 106,152

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000106 · wk-form4_1753820454.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,046

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000102 · wk-form4_1749847291.xml · nonDerivative · entry 2

Hanstveit Arve · CIK 0001430122 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 655,220

F2 · price: This amount represents the weighted average sales price of multiple trades ranging from $12.635 to $12.710 per share. The reporting person undertakes to provide the SEC Staff, Energy Recovery, Inc. or a shareholder of Energy Recovery, Inc. full information about the number of shares sold at each separate price upon request.

SEC source: 0001421517-25-000102 · wk-form4_1749847291.xml · nonDerivative · entry 1

Hanstveit Arve · CIK 0001430122 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 685,220

F1 · price: This amount represents the weighted average sales price of multiple trades ranging from $12.690 to $12.810 per share. The reporting person undertakes to provide the SEC Staff, Energy Recovery, Inc. or a shareholder of Energy Recovery, Inc. full information about the number of shares sold at each separate price upon request.

SEC source: 0001421517-25-000089 · wk-form4_1749242898.xml · nonDerivative · entry 1

Hanstveit Arve · CIK 0001430122 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 705,220

F1 · shares: The restricted stock unit will fully vest on 2026 Annual Meeting date, anticipated to be on or about June 4, 2026.

SEC source: 0001421517-25-000096 · wk-form4_1749243159.xml · nonDerivative · entry 1

TONDREAU PAMELA L. · CIK 0001722237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,890

F1 · shares: The restricted stock unit will fully vest on 2026 Annual Meeting date, anticipated to be on or about June 4, 2026.

SEC source: 0001421517-25-000093 · wk-form4_1749243074.xml · nonDerivative · entry 1

BUEHLER ALEXANDER J · CIK 0001397838 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,328

F1 · shares: The restricted stock unit will fully vest on 2026 Annual Meeting date, anticipated to be on or about June 4, 2026.

SEC source: 0001421517-25-000091 · wk-form4_1749242988.xml · nonDerivative · entry 1

Chow Joan Kai · CIK 0001390709 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,022

F1 · shares: The restricted stock unit will fully vest on 2026 Annual Meeting date, anticipated to be on or about June 4, 2026.

SEC source: 0001421517-25-000087 · wk-form4_1749242787.xml · nonDerivative · entry 1

Sabol Colin R · CIK 0001531414 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,397

F1 · shares: The restricted stock unit will fully vest on 2026 Annual Meeting date, anticipated to be on or about June 4, 2026.

SEC source: 0001421517-25-000080 · wk-form4_1747343058.xml · nonDerivative · entry 1

TONDREAU PAMELA L. · CIK 0001722237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,043

SEC source: 0001421517-25-000082 · wk-form4_1747343115.xml · nonDerivative · entry 1

Moon David W · CIK 0001372923 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · David and Rhonda Moon JCP

Disclosed balance after: 36,950

F1 · price: This amount represents the weighted average purchase price of multiple trades ranging from $12.19 to $12.20 per share. The reporting person undertakes to provide the SEC Staff, Energy Recovery, Inc. or a shareholder of Energy Recovery, Inc. full information about the number of shares purchased at each separate price upon request.

SEC source: 0001421517-25-000050 · wk-form4_1741813055.xml · nonDerivative · entry 2

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 108,472

F2 · shares: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 10, 2024.

SEC source: 0001421517-25-000058 · wk-form4_1741897456.xml · nonDerivative · entry 1

Hanstveit Arve · CIK 0001430122 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 693,182

F1 · price: This figure is the weighted average sales price of multiple trades ranging from $16.20 to $16.665 per share. The reporting person undertakes to provide the SEC Staff, Energy Recovery, Inc. or a shareholder of Energy Recovery, Inc. full information about the number of shares sold at each separate price upon request.

SEC source: 0001421517-25-000050 · wk-form4_1741813055.xml · nonDerivative · entry 1

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 110,315

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000052 · wk-form4_1741813182.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,035

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000056 · wk-form4_1741813453.xml · derivative · entry 2

Ramanan Natarajan · CIK 0002058874 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,030

Underlying: Common Stock · 65,030 shares

Expires 2035-03-03

F3 · derivative.exercise_date: This employee stock option was granted on the transaction date. 25% of the options will vest on the 1st anniversary of the grant date; thereafter, the remaining 75% vest 1/36th per month.

SEC source: 0001421517-25-000056 · wk-form4_1741813453.xml · nonDerivative · entry 1

Ramanan Natarajan · CIK 0002058874 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,455

F1 · shares: Each restricted stock unit represents the right to receive, at settlement, one (1) share of the Company's common stock.

F2 · price: These employee restricted stock units were granted on the transaction date. 25% of the restricted stock units will vest on the first four anniversaries of the grant date. Each restricted stock unit represents the right to receive, at settlement, one (1) share of the Company's common stock.

SEC source: 0001421517-25-000030 · wk-form4_1740440089.xml · nonDerivative · entry 1

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 111,109

F1 · security: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 10, 2024.

F2 · price: This figure is the weighted average sales price of multiple trades ranging from $15.31 to $15.53 per share. The reporting person undertakes to provide the SEC Staff, Energy Recovery, Inc. or a shareholder of Energy Recovery, Inc. full information about the number of shares sold at each separate price upon request.

SEC source: 0001421517-25-000024 · wk-form4_1738798701.xml · nonDerivative · entry 3

Ghasripoor Farshad · CIK 0001723522 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · JT with Spouse

Disclosed balance after: 70,230

F2 · shares: These securities were transferred by the reporting person from an individual account to a joint account with the spouse of reporting person.

SEC source: 0001421517-25-000024 · wk-form4_1738798701.xml · nonDerivative · entry 2

Ghasripoor Farshad · CIK 0001723522 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,860

F2 · shares: These securities were transferred by the reporting person from an individual account to a joint account with the spouse of reporting person.

SEC source: 0001421517-25-000028 · wk-form4_1738798910.xml · nonDerivative · entry 1

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 132,553

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000026 · wk-form4_1738798846.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,979

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000024 · wk-form4_1738798701.xml · nonDerivative · entry 1

Ghasripoor Farshad · CIK 0001723522 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 117,860

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000018 · wk-form4_1738624736.xml · nonDerivative · entry 2

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 133,497

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000022 · wk-form4_1738624936.xml · nonDerivative · entry 2

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,861

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000020 · wk-form4_1738624820.xml · nonDerivative · entry 2

Ghasripoor Farshad · CIK 0001723522 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,280

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000018 · wk-form4_1738624736.xml · nonDerivative · entry 1

Clemente Rodney · CIK 0001668422 · SVP, Water

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,112

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000022 · wk-form4_1738624936.xml · nonDerivative · entry 1

Yeung William · CIK 0001677876 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 104,488

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

SEC source: 0001421517-25-000020 · wk-form4_1738624820.xml · nonDerivative · entry 1

Ghasripoor Farshad · CIK 0001723522 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,206

F1 · shares: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).