Key facts
- This page summarizes William Yeung's Form 4 filing for Energy Recovery, Inc. (ERII).
- 9 reported transactions and 3 derivative rows are listed below.
- Accepted by SEC: 27 Oct 2025, 17:28.
William Yeung - 23 Oct 2025 Form 4 Insider Report for Energy Recovery, Inc. (ERII)
- Reporting relationship
- Chief Legal Officer
- Issuer ticker
- ERII
- Reported as of
- 23 Oct 2025
- Net transaction value
- -$226,799
- SEC form
- 4
- Accepted by SEC
- 27 Oct 2025, 17:28:52 UTC
- Prior SEC filing
- 22 Oct 2025
- Next SEC filing
- 03 Feb 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ William Yeung
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
William Yeung filed Form 4 for Energy Recovery, Inc. (ERII) on 27 Oct 2025.
Change
- Previous filing in this sequence was filed on 22 Oct 2025.
- Current net transaction value: -$226,799.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001677876
Primary reporting owner
Yeung William
- Relationship
- Chief Legal Officer
- Address
- C/O ENERGY RECOVERY, INC., 1717 DOOLITTLE DRIVE, SAN LEANDRO
- Signature
- /s/ William Yeung
- Signature date
- 27 Oct 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
ERII
transaction
Common Stock
Options Exercise
- Transaction value
- $26,475
- Shares
- +3,530
- Change %
- +3.6%
- Price
- $7.50
- Shares after
- 100,899
- Date
- 23 Oct 2025
- Ownership
- Direct
ERII
transaction
Common Stock
Sale
- Transaction value
- $61,775
- Shares
- -3,530
- Change %
- -3.5%
- Price
- $17.50
- Shares after
- 97,369
- Date
- 23 Oct 2025
- Ownership
- Direct
- Footnotes
- F1
ERII
transaction
Common Stock
Options Exercise
- Transaction value
- $57,451
- Shares
- +5,638
- Change %
- +5.8%
- Price
- $10.19
- Shares after
- 103,007
- Date
- 24 Oct 2025
- Ownership
- Direct
ERII
transaction
Common Stock
Sale
- Transaction value
- $101,484
- Shares
- -5,638
- Change %
- -5.5%
- Price
- $18.00
- Shares after
- 97,369
- Date
- 24 Oct 2025
- Ownership
- Direct
- Footnotes
- F1
ERII
transaction
Common Stock
Options Exercise
- Transaction value
- $26,475
- Shares
- +3,530
- Change %
- +3.6%
- Price
- $7.50
- Shares after
- 100,899
- Date
- 24 Oct 2025
- Ownership
- Direct
ERII
transaction
Common Stock
Sale
- Transaction value
- $63,540
- Shares
- -3,530
- Change %
- -3.5%
- Price
- $18.00
- Shares after
- 97,369
- Date
- 24 Oct 2025
- Ownership
- Direct
- Footnotes
- F1
ERII
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 5,568
- Date
- 23 Oct 2025
- Ownership
- Spouse
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
ERII
transaction
Derivative
Employee Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $26,475
- Shares
- -3,530
- Change %
- -17%
- Price
- $7.50
- Shares after
- 17,650
- Date
- 23 Oct 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 3,530
- Exercise price
- $7.50
- Footnotes
- F2
ERII
transaction
Derivative
Employee Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $57,451
- Shares
- -5,638
- Change %
- -26%
- Price
- $10.19
- Shares after
- 16,229
- Date
- 24 Oct 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 5,638
- Exercise price
- $10.19
- Footnotes
- F3
ERII
transaction
Derivative
Employee Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $26,475
- Shares
- -3,530
- Change %
- -20%
- Price
- $7.50
- Shares after
- 14,120
- Date
- 24 Oct 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 3,530
- Exercise price
- $7.50
- Footnotes
- F2
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 3 footnotes
Footnote F1
These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
Footnote F2
This employee stock option was granted on February 1, 2018. 25% of the shares fully vest on the 1st anniversary of the vesting start date; thereafter, the remaining 75%, vest 1/36th per month.
Footnote F3
25% of these options fully vest on the 1st anniversary of the vesting start date of 02/02/2017; thereafter, the remaining 75% vest 1/36th per month.