| # | Company | Employees |
|---|---|---|
| 1 | 71,933 | |
| 2 |
Petrobraspetrobras.com.br
The company aims to provide ethical, safe, and competitive energy solutions while focusing on sustainability, environmental responsibility, and employee well-being |
56,267 |
| 3 |
Rede D'Orrededorsaoluiz.com.br
The largest integrated healthcare network in Brazil, with hospitals, oncology clinics, blood banks, and research institutes across multiple states Follow on social media for updates |
42,515 |
| 4 |
TIM Brasiltim.com.br
Leading mobile telecommunications provider in Brazil with a focus on innovation and quality services including mobile, fixed-line, and broadband internet |
20,211 |
| 5 | 20,150 | |
| 6 |
Neoenergia S.A.neoenergia.com
Open capital company, Brazilian electricity sector leader. Operations span generation, transmission, distribution, and commercialization, serving 16 million customers across 18 states. |
16,000 |
| 7 |
Eletrobraseletrobras.com
Generation, transmission, commercialization, and energy efficiency programs; electric sector leader in Latin America, clean and renewable energy matrix. |
13,000 |
| 8 |
Ipirangaipiranga.com.br
Provider of quality fuels and services for industry, transportation, and logistics in Brazil, focusing on customer relationships, innovation, and sustainability initiatives |
8,612 |
| 9 |
Lightlight.com.br
Provides essential energy distribution, generation, and services to over 10 million people in 31 municipalities in the state of Rio de Janeiro, Brazil. |
7,516 |
| 10 |
Vibravibraenergia.com.br
Largest multienergy platform in the country, leading in fuel distribution, licensed to operate Petrobras and BR Aviation brands. |
6,425 |
| 11 |
Transpetro - Petrobras Transporte S. A.transpetro.com.br
Provider of logistics solutions for the oil and gas industry, operating terminals, pipelines, ships, and storage facilities for oil, derivatives, and biofuels |
5,169 |
| 12 |
Embratelembratel.com.br
Specializing in IT, Telecom, and Mobility solutions, we help businesses evolve through digital transformation by offering a complete portfolio for innovation and growth |
5,118 |
| 13 |
Wilson Sonswilsonsons.com.br
The largest integrated port and maritime logistics operator in Brazil with over 180 years of experience providing comprehensive trade and industry solutions |
4,864 |
| 14 |
Supergasbras Energia Ltdasupergasbras.com.br
We are a leading distributor of LP Gas in Brazil, providing customized energy solutions to households and businesses, with a focus on quality, safety, and environmental sustainability |
4,857 |
| 15 |
RioSaúderiosaude.prefeitura.rio
Public health organization in Rio de Janeiro dedicated to serving the local population with medical care and health services 🏥👩🏽⚕️🩺 |
4,345 |
| 16 |
Águas do Rioaguasdorio.com.br
We are the concessionaire responsible for providing water and sewage services in 27 municipalities in Rio state, including various areas of the Capital |
4,220 |
| 17 |
DaVita Tratamento Renaldavita.com.br
A global leader in providing renal care through innovative practices, improving health, quality of life, and access to treatment for patients worldwide |
3,823 |
| 18 |
CEDAE - Companhia Estadual de Águas e Esgotoscedae.com.br
A water and sewage company in Rio de Janeiro that operates water supply, sewage collection, treatment, and distribution for over nine million people |
3,011 |
| 19 |
BNDESbndes.gov.br
A federal public entity providing long-term financing to projects supporting Brazilian development, including infrastructure, industry, agriculture, and social investments in education and health |
2,963 |
| 20 |
Enevaeneva.com.br
A leading integrated energy operator, involved in exploration, production, and supply of energy solutions Operates gas fields and power generation assets across Brazil |
2,771 |
| 21 |
Corpo de Bombeiros Militar do Estado do Rio de Janeiro - CBMERJcbmerj.rj.gov.br
The organization is a military force in Rio de Janeiro tasked with civil defense, firefighting, search and rescue, and public assistance |
2,691 |
| 22 |
Ocyanocyan-sa.com
Specializing in sustainable solutions for the offshore oil and gas industry, the company focuses on safety, client partnership, and ethical operations with drilling and FPSO services |
2,637 |
| 23 |
Companhia Municipal de Limpeza Urbana - COMLURBrio.rj.gov.br
The organization is a major public cleaning entity in Latin America, focusing on urban cleaning services in Rio de Janeiro |
2,595 |
| 24 |
Icatu Segurosportal.icatuseguros.com.br
Specialized in life insurance, pension plans, capitalization bonds, and asset management, offering financial security and realization through partnerships and corporate clients. |
2,557 |
| 25 |
Hospital São Vicente de Paulohsvp.org.br
A healthcare provider that achieved accreditation from JCI multiple times, confirming the quality and safety of its services |
2,499 |
| 26 |
Constellation Oil Servicestheconstellation.com
A drilling contractor specializing in deep and ultra-deepwater drilling, with a focus on safety, trust, excellence, and sustainability in operations |
2,357 |
| 27 |
Auto Viação 1001 Ltdaautoviacao1001.com.br
A transportation company specializing in long-distance bus travel in the Rio de Janeiro region, part of a larger group with modern amenities and sustainable practices |
2,316 |
| 28 |
Rede Hospital Casaredehospitalcasa.com.br
Leading independent medical hospital operator in Rio de Janeiro, providing a wide range of specialties, 11 emergency rooms, 44 surgery rooms, and a focus on humanized patient care |
2,210 |
| 29 |
Metrô Riometrorio.com.br
The Rio de Janeiro Metro operates since 1979, managing two lines with 38 stations, transporting around 550,000 passengers daily |
2,193 |
| 30 |
Assim Saúdeassim.com.br
A healthcare operator in Rio de Janeiro with a vast network of hospitals and clinics, offering quality medical services with modern technology and skilled professionals |
2,149 |
| 31 |
PETROBRAS PETROLEO BRASILEIRO SApetrobras.com.br
A publicly traded company in the Oil and Gas industry, headquartered in Rio de Janeiro, founded in 1953 |
2,085 |
| 32 |
SuperViasupervia.com.br
The company operates urban train services in the Rio de Janeiro Metropolitan Region, serving thousands of passengers through a 270-kilometer rail network |
2,028 |
| 33 |
Eletronucleareletronuclear.gov.br
produces electricity from nuclear sources, operating Angra 1 and Angra 2 plants, supplying significant power to Rio de Janeiro with a focus on safety and environmental monitoring. |
2,020 |
| 34 |
Log-In Logística Integradaloginlogistica.com.br
A logistics solutions provider specializing in coastal navigation in Brazil and Mercosur, serving a diverse customer portfolio with a large workforce |
1,942 |
| 35 |
PRIOprio3.com.br
Leading independent oil and gas company in Brazil, focusing on efficient reservoir management and redeveloping mature fields with innovative approaches |
1,843 |
| 36 |
SAAEbarramansa.rj.gov.br
The organization is responsible for water supply, treatment and distribution, as well as sanitation services and waste management in Barra Mansa, Rio de Janeiro |
1,776 |
| 37 |
Triunfo Logísticalinktr.ee
A leading provider of competitive port operation and logistics solutions, committed to excellence, innovation, ethics, and safety for stakeholders and society |
1,749 |
| 38 |
DECEA - Departamento de Controle do Espaço Aéreodecea.gov.br
An organization managing activities related to air traffic control, search and rescue, and aeronautical telecommunications, covering a vast airspace area |
1,730 |
| 39 |
Grupo Águas do Brasilgrupoaguasdobrasil.com.br
The company provides water supply, sewage collection and treatment services in Brazil, with a focus on customer service and sustainable growth Expanding operations in Rio de Janeiro |
1,641 |
| 40 |
Prumoprumologistica.com.br
A multi-business economic group developing a sustainable and competitive port-industry, expanding a business ecosystem while prioritizing environmental protection and ESG commitments |
1,560 |
| 41 |
ONS - Operador Nacional do Sistema Elétricoons.org.br
Coordination and control of electric power generation and transmission operations in the national interconnected system, with planning for isolated systems |
1,552 |
| 42 |
Unimed Volta Redondaunimedvr.com.br
With 35 years of history, it is the largest medical organization in the Southern Rio de Janeiro region, providing quality care to over 66,000 clients |
1,476 |
| 43 |
Prudential do Brasilprudential.com.br
Offers personalized individual and group life insurance solutions in Brazil, protecting millions of lives, part of a global financial services and investment management leader. |
1,398 |
| 44 |
CHN - Complexo Hospitalar de Niteróihospitaisredeimpar.com.br
A leading healthcare center in the east region, specializing in major surgeries, trauma care, cardiology, neurology, pediatrics, maternity, and transplants Offers a wide range of medical services with over 1400 employees |
1,361 |
| 45 | 1,336 | |
| 46 |
Rede D'Or Starrededorsaoluiz.com.br
Providing a unique and upscale healthcare experience with cutting-edge technology for diagnosis and treatment, focusing on comfort, hospitality, and humanized care |
1,246 |
| 47 |
Transmissora Aliança de Energia Elétrica - TAESAtaesa.com.br
A leading Brazilian group dedicated to electric power transmission, focusing on technical excellence, sustainability, and innovation to connect Brazil with reliable energy |
1,225 |
| 48 |
Camorim Serviços Marítimoscamorim.com.br
A maritime group with over 1,000 employees and a fleet of 50+ vessels, providing support along the Brazilian coast and in port complexes |
1,211 |
| 49 |
State Grid Brazil Holding S.A.stategrid.com.br
A subsidiary of a Chinese state-owned company, operating and maintaining seven energy transmission concessions in Brazil since 2010 |
1,181 |
| 50 |
Origem Energiaorigemenergia.com
Established in 2017, it specializes in energy integration across different sectors and operates across various states, offering a diverse portfolio of energy solutions |
1,090 |
| 51 |
Rio+Saneamentoriomaissaneamento.com.br
A water and sewage concessionaire in Rio de Janeiro aiming to provide universal access to clean water and sanitation services |
1,046 |
| 52 |
Sumicitygigamaisfibra.com.br
Leading provider of fiber optic internet in Brazil, with over 15 million customers and 5 million connections nationwide, focused on modernity and customer satisfaction |
1,016 |
| 53 |
Oncologia D'Orrededorsaoluiz.com.br
Specializing in oncology, we offer superior cancer diagnosis and treatment across Brazil with a network of over 40 units and 360+ oncologists |
1,004 |
| 54 |
CYMI BRASILcymi.com.br
With over 60 years of experience, we specialize in infrastructure concessions, energy transmission, substations, and now also operate in sanitation and renewable energy sectors |
992 |
| 55 |
RIOgaleão – Aeroporto Internacional Tom Jobimriogaleao.com
The RIOgaleão - Aeroporto Internacional Tom Jobim manages and operates a major international airport in Rio de Janeiro, providing unique travel experiences |
967 |
| 56 |
Rio Itarioita.com.br
Contributing to urban mobility development in Rio de Janeiro since 1954, offering intercity bus transportation services to thousands of customers daily Serving multiple cities in the region |
958 |
| 57 |
Porto Sudesteportosudeste.com
A private port terminal dedicated to handling iron ore, strategically located in Itaguaí (RJ) with the capability of moving up to 50 million tons annually |
954 |
| 58 |
INBinb.gov.br
The business operates in the nuclear fuel supply chain, including mining, processing, enrichment, and fuel fabrication for Brazilian nuclear power plants |
930 |
| 59 |
Instituto Nacional de Traumatologia e Ortopediainto.saude.gov.br
Specializing in treating complex orthopedic diseases and traumas, the organization excels in surgical procedures and research, with a focus on quality and innovation |
891 |
| 60 |
Hospital Icaraíhospitalicarai.com.br
Established in 2011, a healthcare facility offering top-notch services with a focus on humanizing care and ethical practices in Niterói, Rio de Janeiro |
880 |
| 61 |
Hospital Municipal Souza Aguiarfacebook.com
Medical practice located in Rio De Janeiro, Brazil, offering services at Hospital Municipal Souza Aguiar in the field of healthcare |
834 |
| 62 |
Starnav Serviços Marítimos Ltda.starnav.com.br
Brazilian maritime services provider operating offshore support vessels in the oil industry and tugboats in major Brazilian ports, serving leading oil companies |
833 |
| 63 |
Unimed Leste Fluminenseunimed.coop.br
A healthcare organization with over 1,100 cooperative doctors serving 100k+ clients, backed by a team of 1,300 staff Offering advanced and holistic medical care |
805 |
| 64 |
Unimed Ferjunimed.coop.br
Founded in 1972, this organization in Rio de Janeiro supports 18 local healthcare cooperatives, focusing on people and providing services to the community |
773 |
| 65 |
Sepetiba Teconcsn.com.br
Specialized terminal in Itaguaí Port, near Rio de Janeiro, offering modern infrastructure and strategic location for efficient cargo concentration and distribution operations |
713 |
| 66 |
Hospital Municipal Ronaldo Gazolla
This medical center is a key part of the city's healthcare system, with a large outpatient clinic, numerous specialties, and a vast number of hospital beds |
706 |
| 67 |
Porto do Açuportodoacu.com.br
We are a private port in Brazil with unique infrastructure supporting new businesses and low-carbon industries, leading the energy transition |
692 |
| 68 |
Grupo Ensegenseg.com.br
The company operates in fire systems, workplace safety, pre-hospital care, construction, and shrimp cultivation, ensuring safety and quality in industrial, commercial, and agricultural sectors |
680 |
| 69 |
Santa Casa de Misericórdia de Barra Mansascbm.org.br
The company specializes in providing healthcare services with a focus on traditional care tailored to modern times, led by Dr Elder Machado Sarmento |
646 |
| 70 |
Telecalltelecall.com
Provider of smart internet and telephony solutions with high-capacity fiber network, ensuring quality, speed, and efficiency for businesses |
643 |
| 71 |
Transportes Florestransportesflores.com.br
With over 60 years of experience, it is the largest bus operator in Baixada Fluminense, offering intercity passenger services in Rio de Janeiro and surrounding areas |
639 |
| 72 |
Hospital Sao Jose Do Avaihsja.com.br
Sharing health tips, technological advancements, medical breakthroughs, and daily life at Hospital São José do Avaí in Itaperuna-RJ |
628 |
| 73 |
Hospital e Clínica São Gonçalohcsg.com.br
The Hospital & Clinic São Gonçalo provides modernized and expanded healthcare services, including 24-hour emergency care, outpatient services, and a comprehensive laboratory |
628 |
| 74 |
Hospital Copa Starrededorsaoluiz.com.br
A cutting-edge healthcare facility in the heart of Rio de Janeiro's Copacabana, providing excellence in medical assistance and hospital services nationwide |
609 |
| 75 |
Grupo Perinatalrededorsaoluiz.com.br
Specialized healthcare institution focusing on obstetrics, high-risk pregnancy, fetal medicine, neonatology, and diagnostic services for women and mothers |
605 |
| 76 |
Instituto Nacional de Cardiologia (Instituto Nacional de Cardiologia Laranjeiras)inc.saude.gov.br
Specializing in high-complexity treatment for cardiac diseases, the institute stands out for hemodynamic procedures, complex heart surgeries, transplants, and professional training in the healthcare field |
592 |
| 77 |
Hospital Naval Marcílio Dias
Medical practice located in Rio De Janeiro, Brazil, providing services at Hospital Naval Marcílio Dias on R CÉSAR ZAMA 185 |
582 |
| 78 |
HEMORIOhemorio.rj.gov.br
A blood center in Rio de Janeiro supplying blood and its products to around 180 healthcare facilities |
579 |
| 79 |
LAMSAlamsa.com.br
Manages toll expressway in Rio de Janeiro connecting Fundão Island to Barra da Tijuca, including a major tunnel, as part of an infrastructure investment holding |
576 |
| 80 |
TAGntag.com.br
Transporting gas across 10 Brazilian states, integrating energy from various sources to distribution networks, and providing proactive logistical solutions for energy security. |
419 |
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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 Oct 24, 2026.
More company lists in Rio de Janeiro State
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- Healthcare providers in Rio de Janeiro State 54
- Oil and Gas companies in Rio de Janeiro State 53
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- IT Services and IT Consulting companies in Rio de Janeiro State 39
- Financial Services companies in Rio de Janeiro State 36
- Construction companies in Rio de Janeiro State 34
- Food and Beverage Services companies in Rio de Janeiro State 32
- Primary and Secondary Education companies in Rio de Janeiro State 31
- Investment Management companies in Rio de Janeiro State 30
- Franchise networks in Rio de Janeiro State 27
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