Were William Yeung’s Energy Recovery (ERII) share sales under a Rule 10b5-1 plan?

Yes. A footnote states that the transactions reported were effected pursuant to a Rule 10b5-1 trading plan adopted by Yeung. Such pre-arranged plans schedule trades in advance, providing structure to insider transactions and limiting discretion over timing.

Energy Recovery (ERII) CLO sells 2,048 shares; 2,828 withheld for taxes

Q: At what prices did William Yeung trade Energy Recovery (ERII) shares?

Yeung’s open-market or private sale of 2,048 shares occurred at $8.56 per share . The separate tax-withholding disposition of 2,828 shares tied to vesting was recorded at $8.42 per share , reflecting the value of shares used to satisfy his tax obligation.

Q: How many Energy Recovery (ERII) shares were withheld for William Yeung’s taxes?

A total of 2,828 shares of Energy Recovery common stock were disposed of on July 27, 2026 to pay Yeung’s tax obligation. The footnote explains this occurred by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e) .

Q: What indirect Energy Recovery (ERII) holdings does William Yeung report?

Yeung reports indirect ownership of 5,568 shares of Energy Recovery common stock held through his spouse as of July 27, 2026. These shares are coded as indirect ownership, reflecting they are not held directly in his own name but still attributed to him.

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Energy Recovery, Inc. Chief Legal Officer William Yeung reported selling 2,048 shares of common stock on July 28, 2026 at $8.56 per share in an open-market or private transaction effected under a Rule 10b5-1 trading plan. On July 27, 2026, 2,828 shares were disposed of at $8.42 per share to satisfy tax obligations by withholding securities upon vesting under Rule 16b-3(e). Yeung also reports 5,568 shares of common stock held indirectly through his spouse.

Insider Trade Summary

Net Seller: 4,876 shares

Net Sell 3 txns

Insider Yeung William

Role Chief Legal Officer

Sold 2,048 shs ($18K)

Type	Security	Shares	Price	Value
Sale	Common Stock ^F2	2,048	$8.56	$18K
Tax Withholding	Common Stock ^F1	2,828	$8.42	$24K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 99,291 shares (Direct); Common Stock — 5,568 shares (Indirect, Spouse)

Footnotes (2)

F1. Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).
F2. These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

Key Figures

Shares sold: 2,048 shares Sale price: $8.56 per share Shares withheld for taxes: 2,828 shares +1 more

4 metrics

Shares sold 2,048 shares Common stock sold on July 28, 2026 at $8.56 per share

Sale price $8.56 per share Price for 2,048 common shares sold on July 28, 2026

Shares withheld for taxes 2,828 shares Shares withheld on July 27, 2026 at $8.42 per share to pay tax obligation

Indirectly owned shares 5,568 shares Common shares indirectly owned through spouse as of July 27, 2026

Key Terms

Rule 10b5-1 trading plan, Rule 16b-3(e), withholding securities

3 terms

Rule 10b5-1 trading plan regulatory

"transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Rule 16b-3(e) regulatory

"Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e)"

withholding securities financial

"Payment of tax obligation by withholding securities incident to the vesting of securities"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/29/2026 - 07:59 PM Accepted by SEC EDGAR 07/29/2026 - 07:58 PM

FAQ

What transactions did Energy Recovery (ERII) insider William Yeung report?

William Yeung reported two dispositions of Energy Recovery common stock. He sold 2,048 shares on July 28, 2026 and had 2,828 shares withheld on July 27, 2026 to cover tax obligations related to vesting, plus disclosed 5,568 shares indirectly owned through his spouse.

At what prices did William Yeung trade Energy Recovery (ERII) shares?

Yeung’s open-market or private sale of 2,048 shares occurred at $8.56 per share. The separate tax-withholding disposition of 2,828 shares tied to vesting was recorded at $8.42 per share, reflecting the value of shares used to satisfy his tax obligation.

How many Energy Recovery (ERII) shares were withheld for William Yeung’s taxes?

A total of 2,828 shares of Energy Recovery common stock were disposed of on July 27, 2026 to pay Yeung’s tax obligation. The footnote explains this occurred by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

What indirect Energy Recovery (ERII) holdings does William Yeung report?

Yeung reports indirect ownership of 5,568 shares of Energy Recovery common stock held through his spouse as of July 27, 2026. These shares are coded as indirect ownership, reflecting they are not held directly in his own name but still attributed to him.

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).

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

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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/27/2026

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

X	Form 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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	07/27/2026		F		2,828⁽¹⁾	D	$8.42	101,339	D
Common Stock	07/28/2026		S		2,048⁽²⁾	D	$8.56	99,291	D
Common Stock								5,568	I	Spouse

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

2. 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	07/29/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR