Telefônica Brasil (VIV) boosts cybersecurity with CyberCo Brasil buy and R$48M license deal

Rhea-AI Filing Summary

Telefônica Brasil reports that its indirect subsidiary Telefônica Infraestrutura e Segurança Ltda. has completed the acquisition of all shares of Telefônica Cibersegurança e Tecnologia do Brasil Ltda. (CyberCo Brasil) from Telefónica Cybersecurity & Cloud Tech, S.L. for up to R$232 million. Of this amount, R$212 million was paid in a single installment at signing and up to R$20 million may be paid in 2027 as an earn-out tied to CyberCo Brasil’s 2026 service revenue. CyberCo Brasil will also acquire certain perpetual software licenses from Telefónica Cybersecurity & Cloud Tech, S.L. for R$48 million, paid in a single installment.

CyberCo Brasil provides integrated cybersecurity and information security solutions, supported by a team of more than 300 specialists. The transaction is intended to expand Telefônica Brasil’s information security portfolio, optimize and integrate service offerings and sales, accelerate launches, and reinforce its growth strategy in digital, customer-centric solutions. The company states that the deals required no additional regulatory authorizations beyond its internal governance and followed an independent valuation, which concluded that the negotiated amounts are aligned with market practice and the business’s economic potential.

Insights

Telecom and digital services analyst

Telefônica Brasil deepens in-house cybersecurity capabilities via a mid-sized related-party acquisition.

The company reports that its indirect subsidiary completed the acquisition of all shares of CyberCo Brasil from Telefónica Cybersecurity & Cloud Tech, S.L. for up to R$232 million, plus R$48 million for perpetual software licenses. The structure combines an upfront payment of R$212 million with a potential earn-out of up to R$20 million in 2027, linked to CyberCo Brasil’s service revenue in 2026, which ties part of consideration to future operating performance.

CyberCo Brasil offers integrated cybersecurity solutions, from devices and networks to identity management and incident response, supported by more than 300 specialists. Folding this entity into Telefônica Brasil’s group is described as a way to expand the information security portfolio, integrate sales forces, and accelerate launches in digital solutions with a customer-centric focus. This points to a strategic push to capture growing enterprise and security-related demand within the existing customer base.

The company highlights that no additional regulatory approvals were required beyond internal governance and that an independent valuation confirmed the transaction terms as aligned with market practices and the business’s economic potential. While the financial size appears modest relative to a large telecom operator, subsequent disclosures will clarify how effectively these cybersecurity capabilities translate into revenue growth and margin contribution within Telefônica Brasil’s broader digital services strategy.

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of December, 2025

Commission File Number: 001-14475

TELEFÔNICA BRASIL S.A.
(Exact name of registrant as specified in its charter)

TELEFONICA BRAZIL S.A. (Translation of registrant’s name into English)

Av. Eng° Luís Carlos Berrini, 1376 -  28º andar
São Paulo, S.P.
Federative Republic of Brazil
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F X Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Yes No X 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Yes No X 

TELEFÔNICA BRASIL S.A.

Publicly Held Company

CNPJ/MF No. 02.558.157/0001-62 – NIRE 35.3.0015881-4

NOTICE TO THE MARKET

Telefônica Brasil S.A. (“Company”) (B3: VIVT3; NYSE: VIV) hereby informs its shareholders and the market in general that, on this date, its indirect subsidiary Telefônica Infraestrutura e Segurança Ltda. (“TIS”) has completed, with Telefónica Cybersecurity & Cloud Tech, S.L. (“TTech”), the acquisition of all shares issued by Telefônica Cibersegurança e Tecnologia do Brasil Ltda. (“CyberCo Brasil”), under the terms of the share purchase agreement, for an amount of up to R$232 million, of which R$212 million was paid in a single installment on the signing date of the contract, and up to R$20 million as earn-out, to be paid in 2027, based on CyberCo Brasil’s service revenue in 2026 (“Transaction”). Furthermore, CyberCo Brasil will enter into an Asset Purchase Agreement with TTech to acquire certain perpetual software licenses used in its operations, for which R$48 million will be paid in a single installment.

CyberCo Brasil develops integrated cybersecurity and information security solutions, including devices, networks, cloud, identity management, incident and vulnerability response, as well as consulting services, project design and software and hardware resale with a team of more than 300 specialists. The Transaction aims to expand the portfolio of information security solutions, optimize service offerings, accelerate launches, integrate the sales force, and strengthen the growth strategy in digital solutions with a customer-centric focus.

The documents formalizing the transactions contain terms and provisions common to this type of operation, and do not depend on obtaining any regulatory authorizations or additional approvals beyond those already obtained in accordance with the Company’s internal governance.

The acquisitions were preceded by an independent valuation, confirming that the negotiated amounts are in line with market practices and accurately reflect the economic potential of the business.

São Paulo, December 9, 2025.

David Melcon Sanchez-Friera

CFO and Investor Relations Officer

Telefônica Brasil – Investor Relations

Email: ir.br@telefonica.com

https://ri.telefonica.com.br/en

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

			TELEFÔNICA BRASIL S.A.
Date:	December 9, 2025		By:	/s/ João Pedro Carneiro
				Name:	João Pedro Carneiro
				Title:	Investor Relations Director

FAQ

What transaction did Telefônica Brasil (VIV) announce in this Form 6-K?

Telefônica Brasil reported that its indirect subsidiary Telefônica Infraestrutura e Segurança Ltda. completed the acquisition of all shares of Telefônica Cibersegurança e Tecnologia do Brasil Ltda. (CyberCo Brasil) from Telefónica Cybersecurity & Cloud Tech, S.L. as part of a broader cybersecurity-focused transaction.

How much is Telefônica Brasil paying for CyberCo Brasil?

The share acquisition amount is up to R$232 million, of which R$212 million was paid in a single installment at signing and up to R$20 million may be paid in 2027 as an earn-out based on CyberCo Brasil’s service revenue in 2026. Separately, CyberCo Brasil will pay R$48 million in a single installment for certain perpetual software licenses.

What business does CyberCo Brasil operate in?

CyberCo Brasil develops integrated cybersecurity and information security solutions, covering devices, networks, cloud, identity management, incident and vulnerability response, consulting services, project design, and software and hardware resale, supported by a team of more than 300 specialists.

What strategic goals does Telefônica Brasil seek with the CyberCo Brasil acquisition?

Telefônica Brasil states that the transaction aims to expand its information security solutions portfolio, optimize and integrate service offerings, accelerate product launches, integrate the sales force, and strengthen its growth strategy in digital, customer-centric solutions.

Did the CyberCo Brasil deal require additional regulatory approvals?

The company notes that the transaction documents contain terms typical for this type of operation and do not depend on obtaining any regulatory authorizations or additional approvals beyond those already obtained under Telefônica Brasil’s internal governance.

Was an independent valuation performed for the CyberCo Brasil transaction?

Yes. Telefônica Brasil indicates that independent valuation work was carried out before the acquisitions, and it concluded that the negotiated amounts are in line with market practices and accurately reflect the economic potential of the business.