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).

1. Name and Address of Reporting Person* Gannon Chris M (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 Executive Officer
	3. Date of Earliest Transaction (Month/Day/Year) 02/02/2019
	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(1)(2)	02/02/2019		A		19,059	A	$7.87	83,545	D
Common Stock(3)	02/05/2019		F		1,768	D	$8.4289(4)	81,777	D
Common Stock(5)	02/04/2019		F		2,258	D	$7.7444(6)	79,519	D
Common Stock(5)	02/05/2019		F		1,660	D	$7.7711(6)	77,859	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
Employee Stock Option (Right to Buy)	$7.87	02/02/2019		A		95,622		(7)	02/02/2029	Common Stock	95,622	$7.87	95,622	D

Explanation of Responses:

1. Each restricted stock unit represents the right to receive, at settlement, one (1) share of Common Stock

2. The restricted stock unit award was granted on February 2, 2019 and vests 25% on each of the first four anniversary of the grant date.

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

4. Represents the weighted average stock price of the shares withheld to cover tax obligation for restricted stock unit award vesting.

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

6. Represents the weighted average stock price of the shares sold to cover tax obligation for restricted stock unit award vesting.

7. This employee stock option was granted on February 2, 2019, 25% of the shares will vest on the 1st anniversary of the vesting commencement date, thereafter, the remaining 75% vest 1/36th per month.

Remarks:

	/s/ William Yeung, Attorney-in-fact for Chris Gannon	02/05/2019
	** 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).
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