Companhia De Saneamento Basico Do Estado De Sao Paulo SabespBMFBOVESPA: SBSP3

Annual and Extraordinary Shareholders Meeting - 04/28/2026 - Manual for Shareholders Participation

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COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO - SABESP

PUBLICLY-HELD COMPANY

CNPJ [National Register of Legal Entities] No. 43.776.517/0001-80

MEETING PARTICIPATION MANUAL

to the

ANNUAL AND EXTRAORDINARY GENERAL MEETING

to be held at

11:00 am (GMT-03:00) on April 28, 2026

exclusively digitally



1

  1. GUIDELINES FOR PARTICIPATION IN THE ANNUAL AND EXTRAORDINARY GENERAL MEETING

    Companhia de Saneamento Básico do Estado de São Paulo - Sabesp ("Company" or "Sabesp") will hold the Annual and Extraordinary General Meeting on April 28, 2026, at 11:00

    a.m. (GMT-03:00), on first call, held exclusively digitally ("Meeting" or "AEGM"). In this context, the Company's management believes that holding the Meeting exclusively in digital format can provide greater accessibility for its shareholders who wish to participate in the AEGM, but who, for whatever reason, would be unable to attend in person at the Company's headquarters. Thus, in compliance with paragraph 4 of Article 5 of Brazilian Securities and Exchange Commission (CVM) Resolution No. 81, of March 29, 2022 ("CVM Resolution 81/22"), the management clarifies that, in order to expand the participation of the Company's shareholding base, it believes that it is more appropriate to carry out the AEGM exclusively digitally.

    Date

    April 28, 2026

    Time

    11:00 a.m. (GMT-03:00)

    How to participate?

    The AEGM will be held exclusively digitally through the digital platform Ten Meetings on the date and time indicated above, or by sending a voting instruction prior to the AEGM, via Remote Voting Ballot.

    Summary of matters to be voted on at each Annual and Extraordinary General Meeting

    Annual General Meeting

    1. To examine, discuss and vote on the management´s accounts and to examine, discuss and vote on the Company's financial statements for the fiscal year ended on December 31, 2025, together with the Management Report, the Independent Auditors' Report, the Fiscal Council's Opinion and the Audit Committee's Summary Annual Report;

    2. To resolve the allocation of net income for the fiscal year ended on December 31, 2025;

    3. To elect Mr. Eduardo Parente Menezes as a member of the Board of Directors, for the remainder of the current term of office, that is, until September 27, 2026;

    4. To define the number of members that will comprise the Company's Fiscal Council for

    2

    the next term of office;

    Extraordinary General Meeting

    1. To elect the members of the Company's Fiscal Council;

    2. To set the limit on the annual global compensation of the management for the fiscal year to be ended on December 31, 2026; and

    3. To set the compensation of the members of the Fiscal Council for the fiscal year to be ended on December 31, 2026.

    1. The Restricted Share Plan - Estrela Bonus;

    2. To amend the Company's Bylaws to:

      1. amend the caput of Article 3 to reflect (i) the capitalizations of profit reserves made in 2025 in the amount of BRL 6,210,000,000.00, and in 2026 in the amount of BRL 169,216,143.38 by resolution of the Board of Directors; and (ii) the existence of a special class preferred share (golden share) held by the State of São Paulo;

      2. amend the third paragraph of Article 3 to increase the authorized capital by adding 21,396,937 shares;

      3. include new first paragraphs in Articles 12, 18 and 26, to provide for the permanence of the members of the Board of Directors, the Board of Executive Officers and the Fiscal Council, respectively, in the exercise of their duties, until their respective successors take office, and renumber the subsequent paragraphs;

      4. amend the caput of Article 15 to adjust the minimum frequency of meetings of the Board of Directors from monthly to 8 meetings per year;

      5. amend paragraph ten of Article 15 to eliminate the requirement to prepare an excerpt of the minutes of the Board of Directors' meeting for filing with commercial boards and publication;

      6. amend item IV of Article 16 to limit the scope of authority of the Board of Directors to the approval of strategic and corporate policies;

      7. amend item XIX of Article 16 to change the name of the Eligibility and Compensation Committee to the People and Compensation Committee, and to include the authority of the Board of Directors to elect and remove members of the statutory committees that may be created;

      8. amend item XXI of Article 16, the title of Chapter IX, Article 31, caput and sole paragraph, Article 32, caput and sole paragraph, and Article 43 to change the name

    of the Eligibility and Compensation Committee to People and Compensation Committee;

    III. The stock split of common shares issued by the Company, whereby each 1 common share will be split into 5 common shares, without any change to the amount of the share capital, with the consequent amendment to the caput and paragraph three of Article 3 of the Bylaws; and

    IV. To restate the Company's Bylaws, to reflect the changes proposed in items "II" and "III" of the agenda of the Extraordinary General Meeting, if approved.

    Installation Quorum

    On the first call, at least 1/4 of the shares representing the Company's voting share capital for items (I) to (VII) of the Annual General Meeting´s agenda and for item (I) of the Extraordinary General Meeting´s agenda.

    On the first call, at least 2/3 of the shares representing the Company's voting share capital for items (II) to (IV) of the Extraordinary General Meeting´s agenda.

    If the quorums indicated above are not reached for the voting of the respective items, the Company will publish a new Call Notice with the new date for the respective meeting, and may be validly installed, on

    1. delete item VIII of the first paragraph of Article 23 to organize the duties of the Chief Executive Officer (CEO) in accordance with the Company's practice;

    2. delete item IV of the second paragraph of Article 23 in order to eliminate repetition in the duties of the Chief Financial Officer and Investor Relations Officer and renumber the subsequent items;

    3. amend Article 37 to adapt the reporting lines of the compliance and risk management areas to the internal organizational structure;

    4. amend Article 38 to separate compliance and risk management assignments, with the creation of a new Article 39, renumber the subsequent articles and adjust cross-references;

    5. delete the second paragraph of Article 46 in view of the provision of the duties of the Committees in Internal Rules, with consequent renumbering of the first paragraph; and

    6. amend the sole paragraph of Article 58 to exclude the restriction that the pension plans sponsored by the Company be managed exclusively by a closed entity, under the defined contribution modality.

    second call, with the presence of any number of shareholders.

  2. DOCUMENTS AVAILABLE TO SHAREHOLDERS

    The Company's management informs that the documents necessary for the consideration of the matters of the Meeting are available to the shareholders at the Company's headquarters, on the Company's investor relations website (http://www.ri.sabesp.com.br/), as well as on the website on the CVM (http://www.cvm.gov.br/) and B3 (http://www.b3.com.br/), as listed below:

    1. the financial statements for the fiscal year ended on December 31, 2025, accompanied by (a) the Management Report, (b) the Independent Auditors' Report, (c) the Fiscal Council's Opinion, (d) the Audit Committee's Summary Annual Report, and (e) the executive officers' statement that the they have reviewed, discussed and agreed with the financial statements and the opinions expressed in the Independent Auditors' Report;

    2. the Standardized Financial Statements - DFP;

    3. the remote voting ballots for the matters to be resolved at the Annual General Meeting and for the matters of the Extraordinary General Meeting;

    4. the Management's Proposal, followed by (a) the management's comments on the Company's financial situation, as set forth in Section 2 of the reference form, pursuant to Exhibit 22 of CVM Resolution No. 80, of March 29, 2022 ("Reference Form") (b) information on the allocation of net income for the fiscal year, pursuant to Exhibit A of CVM Resolution 81/22, (c) information regarding the candidate for the position on the Board of Directors, pursuant to items 7.3 to 7.6 of the Reference Form, (d) information regarding candidates for positions on the Fiscal Council, pursuant to items 7.3 to 7.6 of the Reference Form, (e) information on the management's compensation proposal, pursuant to Section 8 of the Reference Form, (f) information on the share-based compensation plan, pursuant to Exhibit B of CVM Resolution 81/22, including the full text of the plan, (g) the report detailing the origin and justification of the proposed changes in the Bylaws and analyzing their legal and economic effects, (h) copy of the bylaws including, in particular, the proposed changes and (i) the restatement of the Company's Bylaws;

    5. the Call Notice; and

    6. this Meeting Participation Manual.

  3. ‌REMOTE PARTICIPATION VIA THE DIGITAL PLATFORM

Shareholders who wish to attend through the Ten Meetings platform ("Digital Platform") must pre-register on the Digital Platform at the following link

https://assembleia.ten.com.br/919638884, by April 26, 2026, in accordance with the steps below:

  1. Pre-Registration. Select the "Register" option and upload the following documents:

    1. Individual Shareholders

      1. Mandatory: Individual Taxpayer's Register (CPF) and photo identification document (Identity Card (RG), Foreign National Register (RNE), Driver's License (CNH, or a professional registration card officially recognized in Brazil;); and

      2. Optional: proof issued by the institution providing bookkeeping share services or by the custodian institution, pursuant to item II of Article 126 of Law No. 6,404, of December 15, 1976 ("Brazilian Corporations Law"), indicating the number of shares held, dated no more than three (3) business days before the date of their accreditation for participation in the AEGM, that is, issued between April 22, 2026 and April 24, 2026.

    2. Legal Entities Shareholders

      1. Mandatory: copy of the amended and restated a bylaws or articles of association, as well as corporate documents evidencing the powers of legal representation (election of officers and/or power of attorney);

      2. Mandatory: CPF and photo identification document (Identity Card (RG), Foreign National Register (RNE), Driver's License (CNH) and professional registration card officially recognized in Brazil;) of their legal representative; and

      3. Optional: proof issued by the institution providing bookkeeping share services or by the custodian institution, pursuant to item II of Article 126 of the Brazilian Corporations Law, indicating the number of shares held dated no more than three (3) business days before the date of their accreditation for the participation in the AEGM, that is, issued between April 22, 2026 and April 24, 2026.

    3. Investment Funds:

      1. Mandatory: copy of the amended and restated fund regulations; copy of the bylaws or articles of association of the fund's administrator or manager, as applicable; as well as corporate documentation evidencing the powers of legal representation of the administrator or manager attending the Meeting, as the case may be (election of administrator and/or power of attorney);

      2. Mandatory: photo identification document (Identity Card (RG), Foreign National Register (RNE), Driver's License (CNH) and professional registration card officially recognized in Brazil) of the legal representative(s); and

      3. Optional: proof issued by the institution providing bookkeeping services or by the custodian institution, pursuant to item II of Article 126 of the Brazilian Corporations Law, indicating the number of shares held dated no more than three (3) business days before the date of their accreditation for the participation in the AEGM, that is, issued between April 22, 2026 and April 24, 2026.

    4. Shareholders represented by proxy:

      1. In addition to the documents listed above, the following must be submitted: (a) power of attorney, which must have been granted less than 1 year prior to the date of the Meeting to an attorney-in-fact who is a shareholder, manager of the Company, lawyer registered in the Brazilian Bar Association or financial institution (except for powers of attorney granted pursuant to paragraph 7, Article 118, of the Brazilian Corporations Law). The administrator of investment funds is responsible for representing its fund unit holders, pursuant to Article 126, paragraph 1, of the Brazilian Corporation Law. Legal entity shareholders may be represented by a proxy appointed in accordance with their bylaws or articles of association, and such a proxy is not required to be a shareholder, manager of the Company, lawyer or financial institution. The power of attorney must be granted in writing and, pursuant to Article 654, paragraphs 1 and 2 of Law No. 10,406, of January, 10 ,2002 ("Brazilian Civil Code"), must include the places where it was granted, full identification of the grantor and grantee, the date and purpose of the grant, and the designation and extent of the powers granted; and

        (b) copy of the photo identification document of the attorney-in-fact and/or relevant corporate acts of the attorney-in-fact, as the case may be;

  2. Email confirmation. After completing pre-registration on the Digital Platform, the shareholder will receive an email confirming receipt of the registration request, which will be analyzed by the Company.

  3. Approval. If the registration is approved, shareholders and their proxies will receive a confirmation email. If the registration is rejected, the shareholders will receive an email explaining the reason for the rejection and, if applicable, instructions on how to regularize the registration. If the shareholder does not receive either confirmation or rejection email within 24 hours prior to the AEGM, they must contact the Company via email at dri@sabesp.com.br.

    On an exceptional basis, the Company waives the requirement for (i) notarization of signature on the documents submitted, (ii) submission of certified copies; (iii) notarization, consularization or apostille of documents executed abroad; and (iv) sworn translation of: (a) documents in Portuguese, English or Spanish, and (b) documents in other foreign languages, provided that they are accompanied by a simple translation into one of the aforementioned languages.

    The shareholder shall be responsible for the accuracy and authenticity of the documents submitted.

    In addition, if the shareholder is represented by proxy at the AEGM, the relevant power of attorney must also be submitted through the Digital Platform, in addition to the documents indicated in Step 1 above.

    PLATFORM INFORMATION

    Once the registration request has been submitted, the shareholder or their representatives will have access to a virtual environment called the "Representatives Panel", which can be accessed through the following link: https://assembleia.ten.com.br/919638884. In this environment, user may monitor the status of the registration approval and update the documentation sent, by logging in with their previously registered login and password.

    Access to the AEGM through the Digital Platform is restricted to shareholders and their representatives or proxies who have duly completed the registration process within the applicable deadline, in accordance with the procedures set forth in this Meeting Participation Manual, and whose registrations have been validated by the Company. Even if the shareholder's registration is approved by the Company, if they do not have shares registered in the last list of the Company's shareholding base, they will not be granted access to the Digital Platform at the time of the Meeting.

    The Company shall not be liable for any operational or connectivity issues experienced by shareholders, nor for any circumstances beyond the Company control that may hinder or prevent their participation in the Meeting through the Digital Platform.

    The Company also recommends that shareholders familiarize themselves in advance with the use of the Digital Platform and verify the compatibility of their electronic devices with the Digital Platform's requirements (including video and audio functionality).

    Additionally, the Company recommends that its shareholders (or their duly appointed representatives or proxies) access the Digital platform at least 30 minutes prior to the Meeting, in order to allow for proper access validation and timely participation.

  4. HOW TO USE THE PLATFORM DURING THE AEGM

    The Shareholder attending the AEGM through the Digital Platform may exercise their voting rights and shall be deemed present and signatories to the minutes, pursuant to paragraph 1 of Article 47 of CVM Resolution 81/22.

    Upon validation of their registration, shareholders attending the AEGM agree to: (i) use the individual access link solely and exclusively for participation in the AEGM; (ii) not transfer or disclose, in whole or in part, the individual link to any third party, whether a shareholder or not, as the link is personal and non-transferable; and (iii) not record or reproduce, in whole or in part, nor transfer to any third party, whether a shareholder or not, any content or information transmitted by virtual means during the AEGM.

    All shareholders, representatives or proxies accessing the Meeting through the Digital Platform will be subject to a visual verification procedure to confirm the regularity of their

    participation. During this procedure, participants must display a valid identification document on the camera of their device, ensuring that the photograph and all the information are clearly visible and legible.

    Throughout the AEGM, participants must keep their camera turned on and remain positioned in front of it, so as to stay visible during the Meeting. Participants who turn off their camera or move out of view may be request to return or reestablish their connection. In case of noncompliance with the request, the shareholder may be removed from the Meeting.

    In order to optimize interaction among participants, audio will be automatically muted during the Meeting. Participants may speak by (i) sending messages at any time or (ii) audio, upon request by message for the timely release of their audio.

    The videoconference will begin 30 minutes prior to the schedule start time of the Meeting, in order to allow for the validation of participants. The Company advises shareholders who choose to participate through the Digital Platform join the AEGM at least 30 minutes in advance.

  5. 3VOTING THROUGH REMOTE VOTING BALLOT:

    Shareholders may, alternatively, vote remotely on the matters included in the agenda of the Meeting from this date, through: (a) transmission of instructions for filling out the remote voting ballot ("Ballot" or "RVB") to their custodian agents, if the shares are deposited with a central depositary; (b) transmission of instructions for filling out the Ballot to the financial institution hired by the Company to provide securities bookkeeping services, Itaú Corretora de Valores S.A. ("Bookkeeping Agent"), if the shares are not deposited in a central depositary;

    (c) transmission of voting instructions through Ten Meetings digital platform (through the link: https://assembleia.ten.com.br/919638884), in the specific tab called "RVB", (d) sending the Ballot, available on the websites of the CVM (http://www.cvm.gov.br/) and the Company (https://ri.sabesp.com.br/), duly filled out and signed directly to the email dri@sabesp.com.br, to the attention of the Company's Investor Relations Office; or (e) the electronic system provided by B3, in the Investor Area (available at https://www.investidor.b3.com.br/), in the 'Services' section, clicking on " Meetings in Progress".

    Voting instructions must be received by the custodian agent, the bookkeeping agent or the Company, as applicable, no later than 4 days prior to the date of the AEGM (that is, by April 24, 2026, inclusive), unless a shorter deadline is established by the service providers. In the case of direct submission to the Company, the Ballot must be duly filled out, initialed and signed, and must be accompanied by the other documents indicated in item 3 above, as applicable, and ad detailed in the Ballot.

    Exceptionally, the Company will not require the presentation of the original Ballot, as well as the certification of signature on Ballot executed in the Brazil, and the notarization, apostille or consularization of Ballots executed abroad, each shareholder being responsible for the accuracy and authenticity of the document.

    The Company will inform the shareholder, within 3 days of receipt of the voting instructions, whether the vote has been successfully recorded or whether any rectification or resubmission of the voting instructions or supporting documents is required.

    If case of a discrepancy between any Ballot received directly by the Company and the voting instruction contained in the consolidated voting map sent by the bookkeeping agent regarding the same CPF or CNPJ registration number, the voting instruction contained in the bookkeeping agent's voting map will prevail, and the Ballot received directly by the Company will be disregarded.

    During the voting period, the shareholder may change their voting instructions as many times as necessary, so that the last voting instruction submitted will be considered in the Company's voting map.

    Shareholders who have already submitted their Ballot may also, if they so wish, register to attend the Meeting through the Digital Platform, in accordance with the terms and deadlines set forth in this Meeting Participation Manual. However, if such shareholder exercises their voting right during the Meeting, all voting instructions previously submitted through a Ballot associated with the same CPF or CNPJ will be disregarded.

  6. VOTING AT THE MEETING AND LIMITATION OF THE EXERCISE OF VOTING RIGHTS

    Each common share confer the right to one vote in the Meeting's resolutions, subject to the limits established in the Company's Bylaws.

    Pursuant to Article 6 of the Company's Bylaws, any shareholder or Group of Shareholders (as defined below), whether Brazilian or foreign, public or private, is prohibited from exercising the voting right in a number exceeding the equivalent of thirty percent (30%) of the total number of shares into which the Company's total voting capital is divided, regardless of the shareholder's or Group of Shareholders' in the share capital ("Limitation on the Exercise of Voting Right").

    Pursuant to the paragraph 3 of Article 6 of the Company's Bylaws, "Group of Shareholders" means the group of two or more persons or any other forms of organization (a) that are bound by voting agreements or arrangements of any kind, including shareholders' agreements, whether directly or through persons (or any other forms of organization) controlled, controlling, or under common control; or (b) among which there is a control relationship with each other; or (c) that are under common control; or (d) in which a person holds, directly or indirectly, an equity interest equal to or greater than 15% of the share capital of the other person; or (e) between two persons, a third common investor that holds, directly or indirectly, an equity interest equal to or greater than 15% of the capital of each of the two persons; or (f) which are managed or are under management by the same person or by parties related to the same person; or (g) have in common the majority of their managers; or (h) whose employees are beneficiaries of the same post-employment benefit plan; or (i) where one is a post-employment benefit plan and the other is the person whose employees contribute to that post-employment benefit plan.

    In the case of investment funds with a common administrator or manager, only those funds for which the investment and voting policy at shareholders' meetings, pursuant to the respective regulations, is the responsibility of the trustee or manager, as the case may be, on a discretionary basis, as established by paragraph four of Article 6 of the Company's Bylaws, will be considered as a Group of Shareholders.

    Due to the Limitation on the Exercise of Voting Rights, the Company requests that shareholders belonging to the "Group of Shareholders", as defined above, report this fact to the Company by 11:00 am(GMT-03:00) on April 24, 2026, and identify the other shareholders that are part of the same "Group of Shareholders".

    Votes that exceed the limits set forth in Article 6 of the Bylaws will not be counted.

  7. GENERAL INFORMATION TO SHAREHOLDERS

Questions regarding access to or use of the Digital Platform for shareholders who wish to participate the AEGM can be sent to the email dri@sabesp.com.br.

The Meeting will be fully recorded and the duly accredited shareholder who participates in the Meeting through the Digital Platform will be considered present and a signatory of the minutes.

Finally, it should be noted that the personal data and documents requested for accreditation and participation in the AEGM will be used exclusively for this purpose.

São Paulo, March 27, 2026

Alexandre Gonçalves Silva

Chairman of the Board of Directors