| # | Company | Employees |
|---|---|---|
| 1 | 6,367 | |
| 2 | 4,950 | |
| 3 |
Câmara Municipal de Lisboalisboa.pt
The Municipal Chamber of Lisbon is responsible for defining and implementing policies to promote development in various areas within the municipality |
2,959 |
| 4 |
AT - Autoridade Tributária e Aduaneiraportaldasfinancas.gov.pt
National entity managing taxes, customs rights, border control for fiscal, economic, societal protection Negotiates international agreements, collaborates with taxpayers, promotes tax compliance, innovation through digital platforms |
2,786 |
| 5 |
Instituto da Segurança Socialseg-social.pt
Providing efficient social security services to ensure the protection and social inclusion of individuals, based on trust, ethics, innovation, and solidarity |
1,183 |
| 6 |
Fundação para a Ciência e a Tecnologia (FCT)fct.pt
A Portuguese agency funding science and technology, coordinating public policies, managing national research network, connecting research with industry, and supporting diverse research areas |
903 |
| 7 |
Turismo de Portugalturismodeportugal.pt
Promotion and development of national tourism, infrastructure qualification, investment support, human resource training, and regulation of gambling activities. |
781 |
| 8 |
Instituto Informática,I.P.seg-social.pt
The organization defines and proposes information technology policies and strategies, ensuring planning, design, implementation, and evaluation of digitization and technological updates in MTSSS |
617 |
| 9 |
SPMS, EPE - Serviços Partilhados do Ministério da Saúdespms.min-saude.pt
A public entity providing shared services in purchasing, logistics, finance, HR, and IT to healthcare organizations in Portugal's National Health Service |
615 |
| 10 |
INPIinpi.justica.gov.pt
The company provides patent protection, trademark registration, and design grants to promote industrial property and innovation investment in Portugal |
598 |
| 11 |
SUCH - Serviço de Utilização Comum dos Hospitaissuch.pt
A nonprofit association providing shared healthcare services, supported by the Ministries of Health and Finance, with over 50 years of hospital service experience |
482 |
| 12 | 429 | |
| 13 |
Administração Pública de Portugaldgaep.gov.pt
Portugal's public administration sector overseeing governmental operations and services for its citizens and residents |
424 |
| 14 |
Camões - Instituto da Cooperação e da Língua, I.P.instituto-camoes.pt
The organization is a public institute responsible for proposing and executing Portuguese cooperation policies and promoting the language and culture abroad |
423 |
| 15 |
INFARMED, I.P.infarmed.pt
A public institute under the Ministry of Health in Portugal, responsible for regulating medicines and health products with administrative and financial autonomy |
400 |
| 16 |
Ordem dos Psicólogos Portuguesesordemdospsicologos.pt
Professional organization representing over 18,000 Portuguese psychologists, responsible for professional title and recognition, ensuring adherence to European professional mobility Directive |
380 |
| 17 |
ANACOM - Autoridade Nacional de Comunicaçõesanacom.pt
ANACOM is the national regulatory authority in Portugal for communications, ensuring compliance with EU and national legislation while maintaining operational independence |
372 |
| 18 | 370 | |
| 19 |
Instituto dos Registos e do Notariadoirn.justica.gov.pt
A public institute under the Ministry of Justice overseeing registry services for civil identification, citizenship, property, vehicles, companies, and collective entities |
361 |
| 20 |
IAPMEI, I.P. - Agência para a Competitividade e Inovaçãoiapmei.pt
A specialized public agency under the Portuguese Ministry of the Economy providing technical and financial support to SMEs for growth and competitiveness |
347 |
| 21 |
ACT - Autoridade para as Condições do Trabalhoportal.act.gov.pt
A government service in Portugal dedicated to promoting and improving working conditions for employees throughout the country |
320 |
| 22 |
Ministry of Justice of Portugalgov.pt
The company is a government department responsible for designing, implementing, and evaluating justice policies as defined by the national assembly and government |
310 |
| 23 |
IHRU – Institute for Housing and Urban Rehabilitationihru.pt
The organization focuses on implementing government policies related to housing, urban regeneration, city development, social safeguarding, and cultural/architectural heritage promotion |
193 |
| 24 |
European Union Drugs Agency (EUDA)euda.europa.eu
Leading authority in the EU on illicit drugs, providing scientific evidence and analysis to inform policies and protect citizens from drug-related harms |
193 |
| 25 |
Portuguese Institute of Sport and Youth, IPipdj.gov.pt
National public body responsible for implementing integrated policy for sports and youth in collaboration with public and private organizations |
183 |
| 26 | 169 | |
| 27 |
Agência para o Desenvolvimento e Coesão, IP – AD&Cadcoesao.pt
The company is responsible for coordinating regional development policies, supporting sustainable development, managing European Structural and Investment Funds, and optimizing financial investments coordination |
147 |
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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 Oct 9, 2026.
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