Arve Hanstveit - Dec 4, 2025 Form 4 Insider Report for Energy Recovery, Inc. (ERII)

Role
Director
Signature
/s/ William Yeung Attorney-in-fact for Arve Hanstveit
Stock symbol
ERII
Transactions as of
Dec 4, 2025
Transactions value $
-$445,110
Form type
4
Date filed
12/8/2025, 04:50 PM
Previous filing
Jun 13, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Hanstveit Arve Director C/O ENERGY RECOVERY, INC., 1717 DOOLITTLE DRIVE, SAN LEANDRO /s/ William Yeung Attorney-in-fact for Arve Hanstveit 2025-12-08 0001430122

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ERII Common Stock Sale -$225K -15K -2.29% $14.97 640K Dec 4, 2025 Direct F1
transaction ERII Common Stock Sale -$221K -15K -2.34% $14.71 625K Dec 5, 2025 Direct F2
holding ERII Common Stock 60K Dec 4, 2025 Sophie Hanstveit Irrevocable Trust F3
holding ERII Common Stock 60K Dec 4, 2025 Natasha Hanstveit Irrevocable Trust F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 This amount represents the weighted average sales price of multiple trades ranging from $14.96 to $14.972 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 This amount represents the weighted average sales price of multiple trades ranging from $14.64 to $14.753 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.
F3 Mr. Hanstveit is sole trustee and exercises sole voting and investment power.

Remarks:

Exhibit 24