William Yeung - 11 Sep 2025 Form 4 Insider Report for Energy Recovery, Inc. (ERII)

Role
Chief Legal Officer
Signature
/s/ William Yeung
Issuer symbol
ERII
Transactions as of
11 Sep 2025
Net transactions value
-$486,869
Form type
4
Filing time
15 Sep 2025, 17:00:47 UTC
Previous filing
29 Jul 2025
Next filing
22 Sep 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Yeung William Chief Legal Officer C/O ENERGY RECOVERY, INC., 1717 DOOLITTLE DRIVE, SAN LEANDRO /s/ William Yeung 15 Sep 2025 0001677876

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ERII Common Stock Options Exercise $276,349 +30,877 +31% $8.95 130,923 11 Sep 2025 Direct
transaction ERII Common Stock Sale $486,869 -33,554 -26% $14.51 97,369 11 Sep 2025 Direct F1, F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction ERII Employee Stock Option (Right to Buy) Options Exercise $276,349 -30,877 -67% $8.95 15,454 11 Sep 2025 Common Stock 30,877 $8.95 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 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 These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
F3 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.