Energy Recovery (ERII) CLO Yeung sells 1,536 shares under 10b5-1 plan

Rhea-AI Filing Summary

Energy Recovery Chief Legal Officer William Yeung reported pre‑planned stock sales under a Rule 10b5-1 trading plan. On February 5, 2026, he sold 890 shares of common stock at $14.59 each. On February 6, 2026, he sold an additional 646 shares at $15.14 each. After these transactions, he beneficially owned 78,208 shares of Energy Recovery common stock directly.

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

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).

X

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^*

Yeung William

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/05/2026

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	02/05/2026		S		890(1)	D	$14.59	78,854	D
Common Stock	02/06/2026		S		646(1)	D	$15.14	78,208	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. These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

Remarks:

	/s/ William Yeung	02/09/2026
	** 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 transaction did ERII report in this Form 4?

Energy Recovery reported that Chief Legal Officer William Yeung sold company common stock in two transactions executed on February 5 and 6, 2026, under a Rule 10b5-1 trading plan adopted by the reporting person.

How many Energy Recovery (ERII) shares did the insider sell?

The insider sold a total of 1,536 Energy Recovery common shares, consisting of 890 shares on February 5, 2026, and 646 shares on February 6, 2026, as reported in the Form 4 filing.

At what prices were the ERII shares sold by the Chief Legal Officer?

On February 5, 2026, 890 common shares were sold at $14.59 per share. On February 6, 2026, another 646 common shares were sold at $15.14 per share, according to the Form 4 disclosure.

How many ERII shares does William Yeung own after these sales?

Following the reported transactions, Chief Legal Officer William Yeung beneficially owned 78,208 shares of Energy Recovery common stock, held in direct ownership as stated in the Form 4 filing’s ownership table.

What is the role of the reporting person in Energy Recovery (ERII)?

The reporting person, William Yeung, serves as Chief Legal Officer of Energy Recovery, Inc. The Form 4 indicates he is an officer of the company and not a director or 10% beneficial owner.

Were the ERII insider stock sales made under a Rule 10b5-1 plan?

Yes. A footnote explains that the transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan that had been adopted by the reporting person before the sales occurred.