SABESP officer exercises 10,317 RSUs, withholds shares

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP regulatory and energy procurement officer Luciane Godinho Domingues exercised 10,317 restricted stock units into Common Shares on May 1, 2026.

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP regulatory and energy procurement officer Luciane Godinho Domingues exercised 10,317 restricted stock units into Common Shares on May 1, 2026. As part of this vesting event, 2,837 Common Shares were delivered back to the issuer to satisfy tax obligations, a tax-withholding disposition rather than an open-market sale.

Following these transactions, Domingues directly holds 7,480 Common Shares and 30,941 remaining restricted stock units. These RSUs come from a prior grant of 41,255 units awarded on April 29, 2025, which vest in four equal annual installments from May 1, 2026 through May 1, 2029, subject to continued service.

Insider Trade Summary

10,317 shares exercised/converted

Exercise 3 txns

Insider Godinho Domingues Luciane

Role Reg. & Energy Proc. Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	10,317	$0.00	$0.00
Exercise	Common Shares	10,317	$0.00	$0.00
Exercise Price or Tax Liability	Common Shares	2,837	$6.69	$19K

Holdings After Transaction: Restricted Stock Units — 30,941 contracts (Direct); Common Shares — 7,480 shares (Direct)

Footnotes (1)

1. F1. On April 29, 2025, the reporting person was granted an aggregate of 41,255 restricted stock units ("RSUs"), vesting pro rata on each of May 1, 2026, May 1, 2027, May 1, 2028 and May 1, 2029, subject to continued service as an officer of the issuer. Each RSU represents the contingent right to receive one Common Share of the Issuer upon vesting.

Key Figures

RSUs exercised: 10,317 units Tax-withholding shares: 2,837 shares Shares held after transaction: 7,480 shares +3 more

6 metrics

RSUs exercised 10,317 units Converted into Common Shares on May 1, 2026

Tax-withholding shares 2,837 shares Delivered to issuer to cover tax liability at $6.69 per share

Shares held after transaction 7,480 shares Direct Common Share holdings following May 1, 2026 transactions

Remaining RSUs 30,941 units Restricted stock units outstanding after the May 1, 2026 vesting

Original RSU grant 41,255 units Grant dated April 29, 2025, vesting annually 2026–2029

Tax-withholding price $6.69 per share Value used for 2,837-share tax-withholding disposition

Key Terms

Restricted Stock Units, tax-withholding disposition, derivative exercise/conversion, Common Shares

4 terms

Restricted Stock Units financial

"the reporting person was granted an aggregate of 41,255 restricted stock units ("RSUs"), vesting pro rata"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition", "transaction_code_description": "Payment of exercise price or tax liability"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

derivative exercise/conversion financial

"transaction_action": "derivative exercise/conversion", "transaction_code_description": "Exercise or conversion of derivative security"

Common Shares financial

"Each RSU represents the contingent right to receive one Common Share of the Issuer upon vesting"

Common shares are the basic units of ownership in a company that give holders a claim on profits and a right to vote on key matters, like electing the board. Think of them as membership cards in a club: they let you share in successes and losses, but in a bankruptcy or liquidation they are paid after creditors and preferred shareholders, so their value can swing more and matters for assessing risk and potential return.

FAQ

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

What insider transactions did SABESP (SBS) officer Luciane Godinho Domingues report?

Luciane Godinho Domingues reported exercising 10,317 restricted stock units into Common Shares and a related tax-withholding disposition of 2,837 Common Shares. These actions reflect a scheduled equity vesting event rather than an open-market purchase or sale of SABESP stock.

How many SABESP (SBS) shares does Luciane Godinho Domingues hold after the Form 4?

After the reported transactions, Luciane Godinho Domingues directly holds 7,480 SABESP Common Shares. She also has 30,941 remaining restricted stock units outstanding, which represent future rights to receive additional Common Shares as those units vest over time.

Was the SABESP (SBS) Form 4 a stock sale by Luciane Godinho Domingues?

The Form 4 shows a tax-withholding disposition of 2,837 shares, not an open-market sale. Shares were delivered to the issuer to cover tax liabilities tied to vesting, a common administrative step in equity compensation rather than a discretionary sale in the market.

What is the size and vesting schedule of Luciane Godinho Domingues’ SABESP RSU grant?

On April 29, 2025, she received 41,255 restricted stock units. These vest in four equal installments on May 1, 2026, May 1, 2027, May 1, 2028, and May 1, 2029, provided she continues serving as an officer of SABESP during the vesting period.

What does the RSU exercise in SABESP (SBS) Form 4 mean for shareholders?

The RSU exercise converts 10,317 units into Common Shares and reflects previously granted compensation becoming shares. It is a routine equity vesting event, with part of the shares withheld for taxes, rather than a new investment or discretionary sale decision by the officer.

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

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Accepted by SEC EDGAR 05/15/2026 - 01:57 PM 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^*

Godinho Domingues Luciane

(Last) (First) (Middle)

300 COSTA CARVALHO STREET

(Street)

SAO PAULO 05429-900

(City) (State) (Zip)

BRAZIL

(Country)

2. Issuer Name and Ticker or Trading Symbol
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP [ SBSP3 ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Reg. & Energy Proc. Officer

2a. Foreign Trading Symbol
[SBS]

3. Date of Earliest Transaction (Month/Day/Year)
05/01/2026

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 Shares	05/01/2026		M		10,317	A	(1)	10,317	D
Common Shares	05/01/2026		F		2,837	D	$6.69	7,480	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
Restricted Stock Units	(1)	05/01/2026		M			10,317	(1)	(1)	Common Shares	10,317	$0	30,941	D

Explanation of Responses:

1. On April 29, 2025, the reporting person was granted an aggregate of 41,255 restricted stock units ("RSUs"), vesting pro rata on each of May 1, 2026, May 1, 2027, May 1, 2028 and May 1, 2029, subject to continued service as an officer of the issuer. Each RSU represents the contingent right to receive one Common Share of the Issuer upon vesting.

Remarks:

All amounts reported in this Form 4 reflect certain recent events exempt from reporting under Section 16(a), namely (i) the receipt of rights to receive dividend equivalents (the accrual of which in this Form 4 upon vesting of the RSUs); (ii) the capital increase that occurred in March 2026; and (iii) the stock split approved by the Issuer's shareholders in April 2026. Due to the issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Securities Exchange Act of 1934 (the "Act"), the reporting person's transactions in the issuer's equity securities are exempt from Sections 16(b) and 16(c) of the Act.

	/s/ Beatriz Caroline de Sousa Daher, as attorney-in-fact for Luciane Godinho Domingues	05/15/2026
	** 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)