Energy Recovery (NASDAQ: ERII) director sells 50,000 shares

Rhea-AI Filing Summary

Energy Recovery, Inc. director Arve Hanstveit sold a total of 50,000 shares of common stock in open-market transactions. On March 5, he sold 38,418 shares at a weighted average price of $10.71 per share, from multiple trades ranging between $10.71 and $10.7109 per share. On March 6, he sold an additional 11,582 shares at $10.615 per share. After these sales, he directly owned 575,220 shares of Energy Recovery common stock.

SEC Form 4

FORM 4

UNITED 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

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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 CA 94577

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Energy Recovery, Inc. [ ERII ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/05/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/05/2026		S		38,418	D	$10.71(1)	586,802	D
Common Stock	03/06/2026		S		11,582	D	$10.615	575,220	D

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This amount represents the weighted average sales price of multiple trades ranging from $10.71 to $10.7109 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.

Remarks:

Exhibit 24

	/s/ William Yeung Attorney-in-fact for Arve Hanstveit	03/09/2026
	** Signature of Reporting Person	Date
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.

FAQ

What insider activity did Energy Recovery (ERII) report for Arve Hanstveit?

Energy Recovery director Arve Hanstveit reported selling 50,000 shares of common stock in two open-market transactions. These sales occurred on March 5 and March 6 and were disclosed in a Form 4 insider trading report filed with regulators.

How many Energy Recovery (ERII) shares did Arve Hanstveit sell and at what prices?

Arve Hanstveit sold 38,418 Energy Recovery shares at a weighted average price of $10.71 and 11,582 shares at $10.615. The March 5 trades ranged from $10.71 to $10.7109 per share, according to the disclosed weighted average pricing footnote.

What is Arve Hanstveit’s remaining Energy Recovery (ERII) share ownership after these sales?

Following the reported transactions, Arve Hanstveit directly owned 575,220 shares of Energy Recovery common stock. This figure reflects his holdings after completing both open-market sales disclosed in the Form 4 filing for early March.

Were Arve Hanstveit’s Energy Recovery (ERII) share sales open-market transactions?

Yes. The Form 4 describes both transactions as open-market sales of Energy Recovery common stock, using transaction code “S.” This code is defined in the filing as a sale in an open-market or private transaction under applicable reporting rules.

What does the weighted average price footnote mean in the Energy Recovery (ERII) Form 4?

The footnote explains that the $10.71 price is a weighted average from multiple trades between $10.71 and $10.7109 per share. It notes that full trade-by-trade details are available to the SEC, the company, or shareholders upon request.