William Yeung - 16 Oct 2025 Form 4 Insider Report for Energy Recovery, Inc. (ERII)

Signature
/s/ William Yeung
Issuer symbol
ERII
Transactions as of
16 Oct 2025
Net transactions value
-$58,245
Form type
4
Filing time
17 Oct 2025, 16:40:45 UTC
Previous filing
07 Oct 2025
Next filing
22 Oct 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 17 Oct 2025 0001677876

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ERII Common Stock Options Exercise $26,475 +3,530 +3.6% $7.50 100,899 16 Oct 2025 Direct
transaction ERII Common Stock Sale $58,245 -3,530 -3.5% $16.50 97,369 16 Oct 2025 Direct F1
holding ERII Common Stock 5,568 16 Oct 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 $26,475 -3,530 -12% $7.50 24,710 16 Oct 2025 Common Stock 3,530 $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.