Energy Recovery director granted 16,797 RSUs

Mitchell John Joseph reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Mitchell John Joseph reported acquisition or exercise transactions in this Form 4 filing.

Energy Recovery, Inc. director John Joseph Mitchell received a grant of 16,797 restricted stock units of common stock on July 9, 2026. The award has a grant price of $0.0000 per share and will fully vest at the 2027 Annual Meeting, anticipated on or around June 3, 2027. Following this award, his reported direct holdings total 16,797 shares.

Insider Trade Summary

Grant/Award: 16,797 shares

Grant/Award 1 txn

Insider Mitchell John Joseph

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	16,797	$0.00	$0.00

Holdings After Transaction: Common Stock — 16,797 shares (Direct)

Footnotes (1)

1. F1. The restricted stock unit will fully vest on the 2027 Annual Meeting, anticipated to be on or around June 3, 2027.

Key Figures

Restricted stock units granted: 16,797 shares Grant price per share: $0.0000 per share Shares owned after transaction: 16,797 shares +1 more

4 metrics

Restricted stock units granted 16,797 shares Grant or award on 2026-07-09 to director John Joseph Mitchell

Grant price per share $0.0000 per share Price for the restricted stock unit award

Shares owned after transaction 16,797 shares Reported direct holdings following the grant

Vesting date 2027 Annual Meeting (around June 3, 2027) Restricted stock unit will fully vest on the 2027 Annual Meeting

Key Terms

restricted stock unit, vest, Annual Meeting

3 terms

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.

vest financial

"The restricted stock unit will fully vest on the 2027 Annual Meeting"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

Annual Meeting regulatory

"The restricted stock unit will fully vest on the 2027 Annual Meeting"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Energy Recovery (ERII) report for John Joseph Mitchell?

Energy Recovery disclosed that director John Joseph Mitchell received 16,797 restricted stock units of common stock on July 9, 2026. The grant was priced at $0.0000 per share and represents equity-based compensation rather than an open-market stock purchase.

When do the 16,797 restricted stock units granted to ERII director John Joseph Mitchell vest?

The 16,797 restricted stock units will fully vest at Energy Recovery’s 2027 Annual Meeting. A footnote states this meeting is anticipated to be on or around June 3, 2027, making vesting dependent on that meeting date being reached.

How many Energy Recovery (ERII) shares does John Joseph Mitchell hold after this grant?

After the July 9, 2026 grant, John Joseph Mitchell’s reported direct holdings total 16,797 shares. This figure reflects the newly awarded restricted stock units, which are tied to common stock and subject to vesting at the 2027 Annual Meeting.

Was John Joseph Mitchell’s ERII equity award made under a Rule 10b5-1 trading plan?

The disclosure indicates the Rule 10b5-1 checkbox was not marked as applicable. This means the reported grant of 16,797 restricted stock units to director John Joseph Mitchell was not identified as being executed under a Rule 10b5-1 trading plan.

What type of security was granted to Energy Recovery (ERII) director John Joseph Mitchell?

John Joseph Mitchell received a grant of restricted stock units linked to Energy Recovery common stock. A footnote explains that this restricted stock unit award will fully vest at the company’s 2027 Annual Meeting, anticipated around June 3, 2027.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/22/2026 - 05:58 PM EDT Learn about SEC filing dates

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^*

Mitchell John Joseph

(Last) (First) (Middle)

1717 DOOLITTLE DR.

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/09/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/09/2026		A		16,797(1)	A	$0	16,797	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. The restricted stock unit will fully vest on the 2027 Annual Meeting, anticipated to be on or around June 3, 2027.

Remarks:

Exhibit 24

	/s/ William Yeung, Attorney-in-fact for John J. Mitchell	07/21/2026
	** 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)