Sabesp CFO RSUs vest; shares used for taxes

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Financial Officer Daniel Szlak reported routine equity compensation activity.

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Financial Officer Daniel Szlak reported routine equity compensation activity. On May 1, 2026, 10,181 restricted stock units vested and were converted into 10,181 Common Shares through a derivative exercise.

To cover tax obligations, 2,800 Common Shares valued at $6.69 per share were delivered back in a tax-withholding disposition, leaving Szlak with 7,381 Common Shares held directly after these transactions. The derivative position reflects a broader grant of 40,715 restricted stock units awarded on April 29, 2025, vesting in four equal annual installments through May 1, 2029.

Insider Trade Summary

10,181 shares exercised/converted

Exercise 3 txns

Insider Szlak Daniel

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	10,181	$0.00	$0.00
Exercise	Common Shares	10,181	$0.00	$0.00
Exercise Price or Tax Liability	Common Shares	2,800	$6.69	$19K

Holdings After Transaction: Restricted Stock Units — 30,533 contracts (Direct); Common Shares — 7,381 shares (Direct)

Footnotes (1)

1. F1. On April 29, 2025, the reporting person was granted an aggregate of 40,715 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 converted: 10,181 shares Tax-withholding shares: 2,800 shares Tax-withholding price: $6.69 per share +3 more

6 metrics

RSUs converted 10,181 shares Restricted stock units converted to Common Shares on May 1, 2026

Tax-withholding shares 2,800 shares Common Shares delivered to cover tax liabilities

Tax-withholding price $6.69 per share Value used for 2,800-share tax-withholding disposition

Shares held after 7,381 shares Direct Common Share holdings after May 1, 2026 transactions

Total RSU grant 40,715 units Restricted stock units granted on April 29, 2025

RSUs remaining unvested 30,534 units Unvested portion of 40,715-unit RSU grant after first vesting

Key Terms

Restricted Stock Units, tax-withholding disposition, derivative exercise/conversion, contingent right

4 terms

Restricted Stock Units financial

"the reporting person was granted an aggregate of 40,715 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

"2800 Common Shares were used in a tax-withholding disposition to satisfy 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

"the 10,181 restricted stock units were reported as a derivative exercise/conversion into Common Shares"

contingent right financial

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

FAQ

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

What did Sabesp (SBS) CFO Daniel Szlak report in this Form 4?

CFO Daniel Szlak reported the vesting and conversion of 10,181 restricted stock units into Common Shares and a related tax-withholding share disposition. These actions reflect scheduled equity compensation rather than open-market buying or selling activity.

How many Sabesp (SBS) shares were involved in the CFO’s RSU vesting?

10,181 restricted stock units vested and were converted into 10,181 Common Shares for CFO Daniel Szlak. This represents one installment of a larger restricted stock unit grant that is scheduled to vest over several years.

How were taxes handled on the Sabesp (SBS) CFO’s RSU vesting?

To satisfy tax obligations from the RSU vesting, 2,800 Common Shares were delivered as a tax-withholding disposition at $6.69 per share. This mechanism pays taxes without requiring the executive to sell shares in the open market.

How many Sabesp (SBS) shares does the CFO hold after these transactions?

Following the May 1, 2026 transactions, CFO Daniel Szlak directly holds 7,381 Common Shares. This reflects the net shares remaining after 10,181 RSUs converted into stock and 2,800 shares were used to cover tax liabilities.

What is the size and schedule of the Sabesp (SBS) CFO’s RSU grant?

On April 29, 2025, the CFO received 40,715 restricted stock units. They vest pro rata on May 1 of 2026, 2027, 2028 and 2029, contingent on continued service, with each vested unit delivering one Common Share.

Did the Sabesp (SBS) CFO sell shares in the open market in this filing?

No open-market sales are reported. The filing shows a derivative exercise converting RSUs into shares and a tax-withholding disposition where 2,800 shares were delivered to cover tax liabilities associated with the vesting event.

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

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Accepted by SEC EDGAR 05/15/2026 - 01:41 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^*

Szlak Daniel

(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)
	Chief Financial 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		10,181	A	(1)	10,181	D
Common Shares	05/01/2026		F		2,800	D	$6.69	7,381	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			10,181	(1)	(1)	Common Shares	10,181	$0	30,533	D

Explanation of Responses:

1. On April 29, 2025, the reporting person was granted an aggregate of 40,715 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 Daniel Szlak	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.
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* Form 4: SEC 1474 (03-26)