SABESP CLO exercises RSUs, withholds shares for tax

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Legal Officer Maria Alicia Lima Peralta reported routine equity compensation transactions.

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Legal Officer Maria Alicia Lima Peralta reported routine equity compensation transactions. On May 1, 2026, she exercised 6,039 Restricted Stock Units into 6,039 Common Shares at a stated price of 0.00 per share.

To cover tax obligations, 1,661 Common Shares were disposed of in a tax-withholding transaction at 6.69 per share, leaving 4,378 Common Shares held directly after the disposition. Following the vesting, 18,122 Restricted Stock Units remain outstanding from a 24,142-unit grant awarded on April 29, 2025.

Insider Trade Summary

6,039 shares exercised/converted

Exercise 3 txns

Insider Lima Peralta Maria Alicia

Role Chief Legal Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	6,039	$0.00	$0.00
Exercise	Common Shares	6,039	$0.00	$0.00
Exercise Price or Tax Liability	Common Shares	1,661	$6.69	$11K

Holdings After Transaction: Restricted Stock Units — 18,122 contracts (Direct); Common Shares — 4,378 shares (Direct)

Footnotes (1)

1. F1. On April 29, 2025, the reporting person was granted an aggregate of 24,142 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: 6,039 shares Tax-withholding shares: 1,661 shares at 6.69 per share Common Shares held after transaction: 4,378 shares +3 more

6 metrics

RSUs exercised 6,039 shares Restricted Stock Units converted to Common Shares on May 1, 2026

Tax-withholding shares 1,661 shares at 6.69 per share Common Shares disposed to cover tax obligations on May 1, 2026

Common Shares held after transaction 4,378 shares Direct ownership following tax-withholding disposition

Original RSU grant size 24,142 RSUs Grant awarded on April 29, 2025 to Chief Legal Officer

Remaining RSUs 18,122 RSUs Outstanding after 6,039 RSUs vested on May 1, 2026

RSU vesting dates May 1, 2026–May 1, 2029 Annual pro rata vesting schedule subject to continued service

Key Terms

Restricted Stock Units, tax-withholding disposition, derivative exercise/conversion, contingent right, +1 more

5 terms

Restricted Stock Units financial

"the reporting person was granted an aggregate of 24,142 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""

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""

contingent right financial

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

Common Shares financial

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

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) report for its Chief Legal Officer?

SABESP reported that Chief Legal Officer Maria Alicia Lima Peralta exercised 6,039 Restricted Stock Units into Common Shares on May 1, 2026. In a related tax-withholding transaction, 1,661 Common Shares were disposed of, leaving her with 4,378 Common Shares held directly after these events.

Were the recent SABESP (SBS) insider transactions open-market buys or sells?

The reported SABESP transactions were not open-market buys or sells. They involved exercising 6,039 Restricted Stock Units into Common Shares and a tax-withholding disposition of 1,661 shares, which covered tax obligations rather than reflecting a discretionary market sale decision by the insider.

How many SABESP (SBS) shares does the insider hold after these Form 4 transactions?

After the reported transactions, the insider directly holds 4,378 SABESP Common Shares. These holdings reflect shares remaining following the exercise of 6,039 Restricted Stock Units and the tax-withholding disposition of 1,661 shares completed on May 1, 2026, as disclosed in the filing.

What is the size and vesting schedule of the SABESP (SBS) RSU grant mentioned?

The filing notes a grant of 24,142 Restricted Stock Units to the insider on April 29, 2025. These RSUs vest pro rata on May 1, 2026, May 1, 2027, May 1, 2028, and May 1, 2029, subject to continued service as an officer of the issuer.

How many SABESP (SBS) Restricted Stock Units remain after the May 1, 2026 vesting?

After 6,039 Restricted Stock Units vested and were exercised into Common Shares on May 1, 2026, 18,122 Restricted Stock Units remain outstanding from the original 24,142-unit grant. Each remaining RSU represents a contingent right to receive one SABESP Common Share upon future vesting.

What prices were reported for the SABESP (SBS) insider transactions on the Form 4?

The RSU exercise into 6,039 Common Shares was reported at a price of 0.00 per share, consistent with equity awards. The related tax-withholding disposition of 1,661 Common Shares occurred at a reported price of 6.69 per share on May 1, 2026, according to the filing.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 05/15/2026 - 02:00 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^*

Lima Peralta Maria Alicia

(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 Legal 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		6,039	A	$0	6,039	D
Common Shares	05/01/2026		F		1,661	D	$6.69	4,378	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			6,039	(1)	(1)	Common Shares	6,039	$0	18,122	D

Explanation of Responses:

1. On April 29, 2025, the reporting person was granted an aggregate of 24,142 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 Maria Alicia Lima Peralta	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)