SABESP (SBS) officer vests 7,371 RSUs and withholds 2,027 shares for taxes

Q: Were the SABESP (SBS) insider transactions open-market sales or tax withholding?

The disposition involved 2,027 Common Shares treated as a tax-withholding disposition at $6.69 per share . This means shares were withheld to satisfy tax liabilities, not sold in the open market as a discretionary trade.

Q: What restricted stock unit grant underlies the recent SABESP (SBS) insider activity?

The activity relates to a prior grant of 29,486 restricted stock units awarded on April 29, 2025 . These RSUs vest pro rata on May 1, 2026, 2027, 2028, and 2029, with each vested unit converting into one SABESP Common Share.

Q: How many SABESP (SBS) restricted stock units remain after the May 1, 2026 vesting?

Following the May 1, 2026 vesting and conversion of 7,371 RSUs , the Form 4 shows 22,113 restricted stock units remaining. These unvested RSUs continue to represent contingent rights to receive SABESP Common Shares upon future vesting dates.

Q: Does the SABESP (SBS) Form 4 indicate any remaining derivative or option positions?

The Form 4 indicates that the reported 7,371 RSUs were exercised into Common Shares, and the derivative summary shows no additional derivative positions from this filing. Remaining exposure comes from the unvested 22,113 restricted stock units tied to the original 2025 grant.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Corporate Services Officer Gustavo Do Valle Fehlberg reported routine equity compensation activity involving restricted stock units and related tax withholding.

On May 1, 2026, 7,371 restricted stock units were exercised into 7,371 Common Shares at a conversion price of $0.00 per share. To cover tax obligations, 2,027 Common Shares were disposed of at $6.69 per share, a tax-withholding disposition rather than an open‑market sale. Following these transactions, he directly holds 5,344 Common Shares. The RSUs stem from a prior grant of 29,486 units on April 29, 2025, vesting in four equal annual installments, and 22,113 restricted stock units remain outstanding after this vesting event.

Insider Trade Summary

Net Buyer: 5,344 shares

Net Buy 3 txns

Insider Do Valle Fehlberg Gustavo

Role Corporate Services Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	7,371	$0.00	$0.00
Exercise	Common Shares	7,371	$0.00	$0.00
Exercise Price or Tax Liability	Common Shares	2,027	$6.69	$14K

Holdings After Transaction: Restricted Stock Units — 22,113 shares (Direct); Common Shares — 5,344 shares (Direct)

Footnotes (1)

F1. On April 29, 2025, the reporting person was granted an aggregate of 29,486 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: 7,371 units Tax-withholding shares: 2,027 shares Tax-withholding price: $6.69 per share +3 more

6 metrics

RSUs exercised 7,371 units Restricted Stock Units converted to Common Shares on May 1, 2026

Tax-withholding shares 2,027 shares Common Shares disposed of to cover tax at $6.69 per share

Tax-withholding price $6.69 per share Value used for 2,027-share tax-withholding disposition

Common Shares held 5,344 shares Direct ownership after May 1, 2026 transactions

Original RSU grant 29,486 units Granted April 29, 2025, vesting annually 2026–2029

Remaining RSUs 22,113 units Restricted stock units outstanding after 7,371 vested on May 1, 2026

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 29,486 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.

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

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 05/15/2026 - 01:50 PM

FAQ

What insider transactions did SABESP (SBS) report for Gustavo Do Valle Fehlberg?

SABESP reported that Corporate Services Officer Gustavo Do Valle Fehlberg exercised 7,371 restricted stock units into Common Shares and had 2,027 shares withheld to cover tax obligations, a routine compensation‑related transaction rather than an open‑market sale.

Were the SABESP (SBS) insider transactions open-market sales or tax withholding?

The disposition involved 2,027 Common Shares treated as a tax-withholding disposition at $6.69 per share. This means shares were withheld to satisfy tax liabilities, not sold in the open market as a discretionary trade.

How many SABESP (SBS) shares does Gustavo Do Valle Fehlberg hold after the Form 4 transactions?

After the reported transactions, Gustavo Do Valle Fehlberg directly holds 5,344 Common Shares of SABESP. This figure reflects the net position after exercising 7,371 RSUs into shares and disposing of 2,027 shares for tax-withholding purposes.

What restricted stock unit grant underlies the recent SABESP (SBS) insider activity?

The activity relates to a prior grant of 29,486 restricted stock units awarded on April 29, 2025. These RSUs vest pro rata on May 1, 2026, 2027, 2028, and 2029, with each vested unit converting into one SABESP Common Share.

How many SABESP (SBS) restricted stock units remain after the May 1, 2026 vesting?

Following the May 1, 2026 vesting and conversion of 7,371 RSUs, the Form 4 shows 22,113 restricted stock units remaining. These unvested RSUs continue to represent contingent rights to receive SABESP Common Shares upon future vesting dates.

Does the SABESP (SBS) Form 4 indicate any remaining derivative or option positions?

The Form 4 indicates that the reported 7,371 RSUs were exercised into Common Shares, and the derivative summary shows no additional derivative positions from this filing. Remaining exposure comes from the unvested 22,113 restricted stock units tied to the original 2025 grant.

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^*

Do Valle Fehlberg Gustavo

(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)
	Corporate Services 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)
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 Shares	05/01/2026		M		7,371	A	⁽¹⁾	7,371	D
Common Shares	05/01/2026		F		2,027	D	$6.69	5,344	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)
Restricted Stock Units	⁽¹⁾	05/01/2026		M			7,371	⁽¹⁾	⁽¹⁾	Common Shares	7,371	$0	22,113	D

Explanation of Responses:

1. On April 29, 2025, the reporting person was granted an aggregate of 29,486 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 Gustavo do Valle Fehlberg	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)

Source: View Original Filing on SEC EDGAR