Cal Water SVP gets stock awards, withholds shares

Q: What insider transactions did CWT executive Michael Luu report?

Michael Luu reported stock-based compensation activity in California Water Service Group (CWT) common stock. He received vested restricted and performance stock awards, and some shares were simultaneously withheld by the company to satisfy related tax withholding obligations.

Q: Were Michael Luu’s CWT transactions open-market buys or sells?

The filing shows no open-market purchases or sales. Shares were acquired through vesting of restricted and performance stock awards, while separate transactions reflect shares withheld and surrendered to the issuer solely to cover tax withholding obligations.

Q: What role does Michael Luu hold at California Water Service Group (CWT)?

Michael Luu is identified as Senior Vice President, Corporate Services & Chief Risk Officer of California Water Service Group. The reported transactions relate to his equity compensation awards in company common stock, rather than ordinary trading activity.

California Water Service Group senior vice president Michael B. Luu reported several stock-based compensation transactions in company common stock.

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Rhea-AI Filing Summary

California Water Service Group senior vice president Michael B. Luu reported several stock-based compensation transactions in company common stock. On March 7, 2026, he acquired shares through the vesting of a Restricted Stock Award and two Performance Stock Unit awards that vested after the Board-approved performance criteria were satisfied, resulting in a 46% payout of the original goals for the PSUs. On March 7 and March 5, 2026, additional shares were withheld and surrendered back to the company to cover associated tax withholding obligations, rather than being sold on the open market.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider Luu Michael B

Role SVP Corp Svce & Chief Risk Of

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	900	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	504	$45.59	$23K
Grant/Award	Common Stock	205	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	115	$45.59	$5K
Exercise Price or Tax Liability	Common Stock	59	$45.59	$3K
Exercise Price or Tax Liability	Common Stock	76	$45.78	$3K

Holdings After Transaction: Common Stock — 24,394.735 shares (Direct)

Footnotes (4)

F1. Represents the number of shares withheld by and surrendered to the Issuer to satisfy the tax withholding obligations that arose in connection with the vesting of the Restricted Stock Award (RSA)
F2. The reporting person was granted a Performance Stock Unit (PSU) award on 3/7/2023. The PSU vested in full based on the satisfaction of certain performance criteria approved by the Board of Directors. The performance criteria was met resulting in 46% payout of the original goal
F3. Represents the number of shares withheld by and surrendered to the Issuer to satisfy the tax withholding obligations that arose in connection with the vesting of a Performance Stock Unit (PSU) Award.
F4. The reporting person was granted a Performance Stock Unit (PSU) award on 6/1/2023. The PSU vested in full based on the satisfaction of certain performance criteria approved by the Board of Directors. The performance criteria was met resulting in 46% payout of the original goal

FAQ

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What insider transactions did CWT executive Michael Luu report?

Michael Luu reported stock-based compensation activity in California Water Service Group (CWT) common stock. He received vested restricted and performance stock awards, and some shares were simultaneously withheld by the company to satisfy related tax withholding obligations.

Were Michael Luu’s CWT transactions open-market buys or sells?

The filing shows no open-market purchases or sales. Shares were acquired through vesting of restricted and performance stock awards, while separate transactions reflect shares withheld and surrendered to the issuer solely to cover tax withholding obligations.

What triggered the CWT performance stock unit vesting for Michael Luu?

Michael Luu’s Performance Stock Unit awards vested in full after performance criteria approved by the Board of Directors were met. The filing states that the performance results produced a 46% payout of the original PSU goal for the referenced awards.

How were taxes handled on Michael Luu’s CWT stock awards?

To cover tax obligations from vesting of restricted and performance stock awards, shares were withheld and surrendered back to California Water Service Group. These transactions are coded as tax-withholding dispositions, not discretionary market sales of stock.

What role does Michael Luu hold at California Water Service Group (CWT)?

Michael Luu is identified as Senior Vice President, Corporate Services & Chief Risk Officer of California Water Service Group. The reported transactions relate to his equity compensation awards in company common stock, rather than ordinary trading activity.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 03/09/2026 - 06:13 PM

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^*

Luu Michael B

(Last)

(First)

(Middle)

1720 NORTH FIRST STREET

(Street)

SAN JOSE

95112

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
CALIFORNIA WATER SERVICE GROUP [ CWT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	SVP Corp Svce & Chief Risk Of

3. Date of Earliest Transaction (Month/Day/Year)
03/05/2026

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)
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	03/05/2026		F		76⁽¹⁾	D	$45.78	23,967.735	D
Common Stock	03/07/2026		A		900⁽²⁾	A	$0.0	24,867.735	D
Common Stock	03/07/2026		F		504⁽³⁾	D	$45.59	24,363.735	D
Common Stock	03/07/2026		A		205⁽⁴⁾	A	$0.0	24,568.735	D
Common Stock	03/07/2026		F		115⁽³⁾	D	$45.59	24,453.735	D
Common Stock	03/07/2026		F		59⁽¹⁾	D	$45.59	24,394.735	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)
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. Represents the number of shares withheld by and surrendered to the Issuer to satisfy the tax withholding obligations that arose in connection with the vesting of the Restricted Stock Award (RSA)

2. The reporting person was granted a Performance Stock Unit (PSU) award on 3/7/2023. The PSU vested in full based on the satisfaction of certain performance criteria approved by the Board of Directors. The performance criteria was met resulting in 46% payout of the original goal

3. Represents the number of shares withheld by and surrendered to the Issuer to satisfy the tax withholding obligations that arose in connection with the vesting of a Performance Stock Unit (PSU) Award.

4. The reporting person was granted a Performance Stock Unit (PSU) award on 6/1/2023. The PSU vested in full based on the satisfaction of certain performance criteria approved by the Board of Directors. The performance criteria was met resulting in 46% payout of the original goal

	By: /s/ Michelle R. Mortensen For: Michael B Luu	03/09/2026
	** 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.

Source: View Original Filing on SEC EDGAR