STOCK TITAN

Energy Recovery (ERII) director awarded 18,094 shares in stock grant

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Hanstveit Arve reported acquisition or exercise transactions in this Form 4 filing.

Energy Recovery, Inc. director Arve Hanstveit reported a stock award. He received 18,094 shares of common stock as a grant at $8.29 per share, increasing his direct holdings to 400,603 shares. The restricted stock unit will fully vest at the 2027 Annual Meeting, anticipated around June 3, 2027. He also reports 60,000 shares held in each of two irrevocable trusts, where he serves as sole trustee with sole voting and investment power.

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Insider Hanstveit Arve
Role null
Type Security Shares Price Value
Grant/Award Common Stock 18,094 $8.29 $150K
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 400,603 shares (Direct, null); Common Stock — 60,000 shares (Indirect, Natasha Hanstveit Irrevocable Trust)
Footnotes (1)
  1. The restricted stock unit will fully vest on the 2027 Annual Meeting, anticipated to be on or around June 3, 2027. Mr. Hanstveit is sole trustee and exercises sole voting and investment power.
Stock grant size 18,094 shares Common stock grant to director Arve Hanstveit
Grant price $8.29 per share Value per share for the 18,094-share award
Direct holdings after grant 400,603 shares Common stock directly held by Hanstveit after transaction
Sophie trust holdings 60,000 shares Common stock in Sophie Hanstveit Irrevocable Trust
Natasha trust holdings 60,000 shares Common stock in Natasha Hanstveit Irrevocable Trust
Vesting date on or around June 3, 2027 Restricted stock unit fully vests at 2027 Annual Meeting
restricted stock unit financial
"The restricted stock unit will fully vest on the 2027 Annual Meeting"
A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.
irrevocable trust financial
"Sophie Hanstveit Irrevocable Trust"
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
voting and investment power financial
"Mr. Hanstveit is sole trustee and exercises sole voting and investment power"
Annual Meeting financial
"will fully vest on the 2027 Annual Meeting, anticipated to be on or around June 3, 2027"
A company's annual meeting is a yearly gathering where owners (shareholders) and the board review performance, ask questions, and vote on key matters like electing directors, approving auditor choices, and sometimes setting pay or dividend policies. For investors it matters because decisions made and votes cast can change who runs the company, influence strategy and payouts, and affect the value or direction of their investment—similar to a homeowners’ meeting where rules and leaders that shape your property’s value are decided.
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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a 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). See Instruction 10.
1. Name and Address of Reporting Person*
Hanstveit Arve

(Last)(First)(Middle)
C/O ENERGY RECOVERY, INC.
1717 DOOLITTLE DRIVE

(Street)
SAN LEANDRO CALIFORNIA 94577

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Energy Recovery, Inc. [ ERII ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock06/04/2026A18,094(1)A$8.29400,603D
Common Stock60,000INatasha Hanstveit Irrevocable Trust(2)
Common Stock60,000ISophie Hanstveit Irrevocable Trust(2)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. The restricted stock unit will fully vest on the 2027 Annual Meeting, anticipated to be on or around June 3, 2027.
2. Mr. Hanstveit is sole trustee and exercises sole voting and investment power.
Remarks:
Exhibit 24
/s/ William Yeung Attorney-in-fact for Arve Hanstveit06/05/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Energy Recovery (ERII) director Arve Hanstveit report in this Form 4?

Director Arve Hanstveit reported receiving 18,094 shares of Energy Recovery common stock as a grant. The shares were awarded at $8.29 per share and increased his direct holdings to 400,603 shares, reflecting routine equity-based compensation rather than an open-market purchase.

At what price were the 18,094 Energy Recovery (ERII) shares granted to Arve Hanstveit?

The 18,094 common shares granted to Arve Hanstveit were valued at $8.29 per share. This figure reflects the grant price used for the equity award and helps indicate the dollar value of the compensation he received through this stock-based grant.

When will Arve Hanstveit’s restricted stock unit in Energy Recovery (ERII) fully vest?

The restricted stock unit will fully vest at the 2027 Annual Meeting, anticipated to occur on or around June 3, 2027. Vesting means the award becomes fully earned, aligning Hanstveit’s compensation with longer-term company performance and continued board service.

How many Energy Recovery (ERII) shares does Arve Hanstveit hold after this transaction?

After the grant, Arve Hanstveit directly holds 400,603 shares of Energy Recovery common stock. In addition, 60,000 shares are held in each of two irrevocable trusts for which he is sole trustee, giving him sole voting and investment power over those trust-held shares.

What is the nature of Arve Hanstveit’s indirect holdings of Energy Recovery (ERII) shares?

Arve Hanstveit’s indirect holdings consist of shares in the Sophie Hanstveit Irrevocable Trust and the Natasha Hanstveit Irrevocable Trust. Each trust holds 60,000 common shares, and he serves as sole trustee with sole voting and investment power over those trust assets.