Energy Recovery (ERII) CTO sells 272 shares at $10.57 each

Rhea-AI Filing Summary

Energy Recovery, Inc. Chief Technology Officer Ramanan Natarajan reported an open-market sale of common stock. On March 5, 2026, he sold 272 shares at a price of $10.57 per share. After this transaction, he directly owned 52,565 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^*

Ramanan Natarajan

(Last) (First) (Middle)

1717 DOOLITTLE DR.

(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)

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

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		272	D	$10.57	52,565	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:

Remarks:

Exhibit 24

	/s/ William Yeung, Attorney-in-Fact for Natarajan Ramanan	03/06/2026
	** 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 transaction did Energy Recovery (ERII) report for Ramanan Natarajan?

Energy Recovery reported that Chief Technology Officer Ramanan Natarajan sold 272 shares of the company’s common stock. The transaction was an open-market sale and was reported on a Form 4 insider trading filing.

How many Energy Recovery (ERII) shares did the CTO sell and at what price?

The Chief Technology Officer sold 272 shares of Energy Recovery common stock at a price of $10.57 per share. This was classified as an open-market sale under transaction code “S” in the Form 4 filing.

How many Energy Recovery (ERII) shares does the CTO hold after this sale?

After the reported sale, Chief Technology Officer Ramanan Natarajan directly owned 52,565 shares of Energy Recovery common stock. The Form 4 filing lists this as the total number of shares beneficially owned following the transaction.

What type of transaction did the Energy Recovery (ERII) Form 4 disclose?

The Form 4 disclosed a non-derivative transaction in Energy Recovery common stock. It was recorded as an open-market sale with transaction code “S,” indicating a sale in the open market or a private transaction by the reporting officer.

What is Ramanan Natarajan’s role at Energy Recovery (ERII) in this Form 4?

In the Form 4, Ramanan Natarajan is identified as an officer of Energy Recovery, serving as Chief Technology Officer. The reported open-market sale of common stock reflects a transaction in his directly owned shares of the company.