This selection of Brazilian cybersecurity companies primarily features large IT services and consulting firms, with a strong presence of established players. Oi, a telecommunications giant, focuses on high-speed connectivity and digital services. Stefanini Brasil provides global IT services, while Valid offers secure identification services. Montreal Oficial specializes in IT solutions, and T-Systems do Brasil delivers integrated IT and communications technology solutions.
A clear pattern among these companies is their focus on comprehensive IT solutions, digital transformation, and business process outsourcing, often incorporating cybersecurity as part of a broader offering. A significant number of these larger firms are headquartered in São Paulo, indicating a concentration of the IT services sector in that city.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 20,150 | ||||
| 2 |
Stefanini Brasilstefanini.com
A global IT services provider offering consulting, integration, solution development, BPO, outsourcing, and technology-based business solutions in over 35 countries |
12,265 | |||
| 3 | 3,613 | ||||
| 4 |
Stefanini LATAMstefanini.com
Provides integrated digital transformation services including consulting, AI, cybersecurity, banking, manufacturing, and digital marketing across 41 countries. |
2,651 | |||
| 5 |
Montreal Oficialmontreal.com.br
A technology company in Brazil with over 30 years of experience, specializing in developing and implementing IT solutions for businesses globally |
2,464 | |||
| 6 |
Stefanini EMEAstefanini.com
Global digital transformation accelerator with 35+ years experience offering diverse technology solutions and IT outsourcing services in 16 European countries |
2,420 | |||
| 7 |
Unifiqueunifique.com.br
Provides communication solutions: internet, TV, landline, mobile, and data center services for businesses, homes, and governments, with advanced technology and customer relationships. |
2,246 | |||
| 8 |
Stefanini North America and APACstefanini.com
A multinational company offering innovative technological solutions to help clients transform their business through digital innovation and co-creation for a better future |
1,999 | |||
| 9 |
T-Systems do Brasilt-systems.com
Global leader in IT & Communications Technology, offering integrated solutions in Digital, SAP, Cloud, Infrastructure, and Security with focus on innovation and customer satisfaction |
1,528 | |||
| 10 |
Globalweb Corpglobalweb.com.br
Cloud services provider offering ERP, CRM, security, data storage, and infrastructure solutions tailored to enhance business competitiveness with modern technology services |
1,443 | |||
| 11 |
Nava | Tech for Businessnava.com.br
A technology company passionate about people and innovation, empowering employees to create solutions for leading companies to positively impact the world |
1,374 | |||
| 12 |
Lanlink Informática Ltda.lanlink.com.br
A technology solutions provider established in 1988, dedicated to delivering quality, excellence, and reliability for business needs with long-term client relationships |
1,352 | |||
| 13 | 1,336 | ||||
| 14 |
BrBPObrbpo.com.br
Brazilian capital-backed firm specialized in interactive client relationship management through integrated technology solutions, omnichannel platforms, and diverse service offerings across 12 strategic nationwide locations |
1,332 | |||
| 15 | 1,256 | ||||
| 16 |
SEK Security Ecosystem Knowledgesek.io
Specialized consultancy providing continuous risk analysis and control services for large companies and organizations, with customized solutions tailored to each client's unique profile |
1,067 | |||
| 17 |
InterOpinterop.com.br
Provides IT services including implementation, integration, monitoring, maintenance, and evolution of technology solutions for businesses of all sizes. |
936 | |||
| 18 |
NTT DATA BRASILnttdata.com
Global IT services arm of NTT with over 75,000 employees in 40+ countries Leading provider of innovative IT solutions benefiting businesses and organizations |
921 | |||
| 19 |
unico IDtechunico.io
Specializing in digital identity, we create solutions to simplify lives and boost businesses for millions of individuals and top firms in the country |
871 | |||
| 20 |
Service IT.service.com.br
Specializing in IT solutions and services such as outsourcing, cybersecurity, and consultation Providing monitoring and management through own operation centers in multiple countries |
751 | |||
| 21 |
Delfiadelfia.tech
A Brazilian multinational specializing in digital curation, offering continuous training to curators to identify and implement innovative solutions for digital success |
694 | |||
| 22 |
Certisigncertisign.com.br
Specializing in digital identification and security solutions for over 26 years, we provide secure and seamless digital experiences for individuals and businesses, reducing fraud and costs |
668 | |||
| 23 |
RTMrtm.net.br
Integrator hub in Brazilian financial market, providing secure technological solutions to over 700 institutions, connecting key players in the industry |
660 | |||
| 24 |
ArcelorMittal Sistemasbrasil.arcelormittal.com
Develops and integrates IT solutions, including cybersecurity, cloud platforms, and SAP projects, to support global steel manufacturing operations with industrial digital efficiency. |
657 | |||
| 25 |
BHSbhs.com.br
Specialists in delivering customized IT solutions to optimize businesses with services including IT infrastructure management, security, software development, collaboration portals, and outsourcing |
655 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
HS Preventhsprevent.com.br
Specializing in services and technological solutions for over a decade, they enhance profitability by offering formalization, credit risk, anti-fraud, and transactional solutions |
631 | |||
| 27 |
Skyoneskyone.solutions
A technology solutions provider focused on agility, innovation, and simplifying business processes to help companies evolve and improve customer experiences |
610 | |||
| 28 |
ATECH – NEGÓCIOS EM TECNOLOGIAS S/Aatech.com.br
Specializing in critical mission solutions and decision-making technologies with a focus on defense projects, innovative solutions, asset management, logistics, digital security, and smart connections |
609 | |||
| 29 |
ISH Tecnologiaish.com.br
A fast-growing IT firm in Brazil offering cybersecurity, cloud computing, IT infrastructure services, and a Tier III Data Center with research & development for tech solutions |
596 | |||
| 30 | 591 | ||||
| 31 |
Soluti Digitalsoluti.com.br
We are an IDTech company offering Digital Identity and Electronic Signature solutions #SolutiDigital |
544 | |||
| 32 |
RSIkeeggo.com
With 25 years of experience, the company focuses on excellence and innovation It encourages breaking from tradition and embracing the future |
506 | |||
| 33 |
Asperasper.tec.br
A rapidly growing cybersecurity company offering managed services to protect organizations' valuable assets, with a team of experts in digital security |
474 | |||
| 34 |
Valid Certificadoravalidcertificadora.com.br
A trusted brand specializing in digital certification, providing high-quality and secure services for individuals and businesses in various sectors |
466 | |||
| 35 |
Companhia de Processamento de Dados do Estado da Bahiaprodeb.ba.gov.rb
Provider of Information Technology and Communication services for the government sector in Bahia, offering data processing, network management, application development, web services, and technical support |
466 | |||
| 36 |
Soow Sigmasoow.com.br
With over 30 years of experience, a highly skilled team provides innovative communication solutions nationwide, prioritizing excellent service and product quality |
422 | |||
| 37 |
INDT - Instituto de Desenvolvimento Tecnológicoindt.org.br
Delivering technology, innovation, and digital transformation through research and development, with over 20 years of experience in the market |
418 | |||
| 38 |
NESSness.com.br
Strategic partner specializing in business processes, technology, and innovation Delivering results, managing risks, and driving efficiency for over 25 years |
418 | |||
| 39 |
Solorsolor.com.br
Specializing in managed IT infrastructure and cybersecurity services, offering tailored solutions to sustain critical technology operations and optimize client investments with agility and expertise |
394 | |||
| 40 |
Engemon ITengemon.com.br
Technology integration company offering infrastructure, services, security, and innovation solutions from top global suppliers to boost business performance |
387 | |||
| 41 |
Safeweb Segurança da Informaçãosafeweb.com.br
Leading digital certification provider in Brazil with 27 years of experience, offering secure solutions to 9 million customers through 4,000 service points worldwide |
373 | |||
| 42 |
Teletex IT Solutionsteletex.com.br
Solution Integrator in IT Infrastructure domain, delivering value through services and products, aligned with customer needs and technology partners |
363 | |||
| 43 |
Tempest Security Intelligencetempest.com.br
Specialized in cybersecurity and digital fraud prevention, offering over 70 solutions to protect businesses of all sizes in various sectors worldwide |
360 | |||
| 44 |
Maminfomaminfo.com.br
Consulting and integrating IT and telecommunications solutions, providing sales, installation, and technical support for network technologies nationwide 24/7 |
354 | |||
| 45 |
Claranet Brasilclaranet.com
Global technology service provider specializing in cloud, AI, cybersecurity, and digital transformation consulting with scalable, customized solutions for clients worldwide. |
331 | |||
| 46 |
Netcenternetcenter.com.br
Define, implement, manage, and protect IT assets with a focus on trust and connection |
309 | |||
| 47 |
Grupo NTSecgrupontsec.com.br
A visionary alliance of leading technology companies uniting to provide innovative solutions and exceptional talent for securing clients' future |
295 | |||
| 48 |
TLD Teledata Tecnologia em Conectividadeteledatabrasil.com.br
With over 36 years of experience in telecommunications, contact center, and IT services, we provide innovative solutions for unified communications, omnichannel contact centers, video conferencing, and more |
290 | |||
| 49 | 232 | ||||
| 50 |
Grupo Imagetechgrupoimagetech.com.br
Leader in IT and communication technology, providing intelligent solutions in information security, communication, service management, outsourcing, and software/app development through national and international partnerships |
199 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.
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