William Yeung - Oct 20, 2025 Form 4 Insider Report for Energy Recovery, Inc. (ERII)

Signature
/s/ William Yeung
Stock symbol
ERII
Transactions as of
Oct 20, 2025
Transactions value $
-$60,010
Form type
4
Date filed
10/22/2025, 06:09 PM
Previous filing
Oct 17, 2025
Next filing
Oct 27, 2025

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 2025-10-22 0001677876

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ERII Common Stock Options Exercise $26.5K +3.53K +3.63% $7.50 101K Oct 20, 2025 Direct
transaction ERII Common Stock Sale -$60K -3.53K -3.5% $17.00 97.4K Oct 20, 2025 Direct F1
holding ERII Common Stock 5.57K Oct 20, 2025 Spouse

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 -$26.5K -3.53K -14.29% $7.50 21.2K Oct 20, 2025 Common Stock 3.53K $7.50 Direct F2
* 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 These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
F2 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.