# The 25 largest public sector organisations in Zagreb

Tamtam tracks 25 public sector organisations headquartered in Zagreb. This list ranks all of them by number of employees on LinkedIn, led by INA Grupa, HEP and FER. Their median headcount is 490. Half of them were founded in 1956 or later.

These public sector organizations in Zagreb are primarily large institutions in essential services and infrastructure. They include significant players in energy, such as HEP, the national electricity provider, and INA Grupa, active in oil and gas. Education and healthcare are also well represented by institutions like FER, a leading higher education institution, and the University Hospital Centre Zagreb. Other organizations cover finance, research, and media, with examples like Financijska agencija - Fina and HRT, the national public media institution.

A notable characteristic of these organizations is their long-standing presence; many were founded in the late 19th or early 20th century, indicating a history of established public service. The cluster of headquarters in Zagreb highlights the city's role as a central hub for governmental and public institutions in Croatia.

🇭🇷 Zagreb · 25 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [INA Grupa](https://www.tamtam.ai/c/ina-grupa) (ina.hr)<br>Oil and gas exploration, production, refining, distribution, and operates a regional network of service stations in Croatia and neighboring countries. | Oil and Gas | 🇭🇷 Zagreb | 4,540 | 1964 |
| 2 | [HEP](https://www.tamtam.ai/c/hep) (hep.hr)<br>National electricity provider with over a century of experience in production, transmission, distribution, heat supply, and gas distribution through a holding structure | Appliances, Electrical, and Electronics Manufacturing | 🇭🇷 Zagreb | 2,058 | 1884 |
| 3 | [FER](https://www.tamtam.ai/c/fer) (fer.unizg.hr)<br>Leading Croatian higher education institution specializing in electrical engineering, computer science, and ICT with over 4,000 students and 700 staff members | Higher Education | 🇭🇷 Zagreb | 1,759 | 1956 |
| 4 | [HRT](https://www.tamtam.ai/c/hrt) (hrt.hr)<br>A national public media institution in Croatia providing a diverse range of programs including news, sports, culture, and educational content through traditional and digital platforms | Broadcast Media Production and Distribution | 🇭🇷 Zagreb | 1,658 | 1926 |
| 5 | [University Hospital Centre Zagreb, Croatia](https://www.tamtam.ai/c/university-hospital-centre-zagreb-croatia) (kbc-zagreb.hr)<br>Leader in medical procedures and diagnostic methods, offering top-quality therapeutic procedures Operates 50+ referral centers of excellence, introducing innovative treatments like gamma knife radiosurgery and laparoscopic surgery | Hospitals and Health Care | 🇭🇷 Zagreb | 1,201 |  |
| 6 | [Medicinski fakultet Sveučilišta u Zagrebu](https://www.tamtam.ai/c/medicinski-fakultet-sveucilista-u-zagrebu) (mef.hr)<br>Leading institution for medical training and research in South-East Europe, with focus on international collaborations and research in various medical fields | Higher Education | 🇭🇷 Zagreb | 1,110 | 1917 |
| 7 | [Financijska agencija - Fina](https://www.tamtam.ai/c/financijska-agencija-fina) (fina.hr)<br>Leading Croatian provider of financial and electronic services, operating on a market principle, collaborating with banks, institutions, and businesses on various projects nationwide | Financial Services | 🇭🇷 Zagreb | 903 |  |
| 8 | [Ruđer Bošković Institute](https://www.tamtam.ai/c/ruder-boskovic-institute) (irb.hr)<br>Leading Croatian scientific institute conducting research in natural, biomedical, marine, and environmental sciences Participates in international research projects and houses 550 scientists | Research Services | 🇭🇷 Zagreb | 804 | 1950 |
| 9 | [Croatia Airlines](https://www.tamtam.ai/c/croatia-airlines) (croatiaairlines.com)<br>National air carrier operating domestic and international flights with a focus on safety, service quality, promoting Croatian culture and tourism Offering inflight services and maintaining highest safety standards | Airlines and Aviation | 🇭🇷 Zagreb | 790 | 1989 |
| 10 | [Sestre milosrdnice University Hospital Center](https://www.tamtam.ai/c/sestre-milosrdnice-university-hospital-center) (kbcsm.hr)<br>A leading healthcare institution in Croatia, offering a wide range of medical services, scientific activities, and hosting educational facilities | Hospitals and Health Care | 🇭🇷 Zagreb | 685 | 1846 |
| 11 | [Croatian National Bank](https://www.tamtam.ai/c/croatian-national-bank) (hnb.hr)<br>A central bank part of the Eurosyste, responsible for maintaining price stability and financial system stability, and participates in the EU monetary policy implementation | Government Administration | 🇭🇷 Zagreb | 642 | 1990 |
| 12 | [Faculty of Economics & Business Zagreb](https://www.tamtam.ai/c/faculty-of-economics-and-business-zagreb) (efzg.unizg.hr)<br>Leading institution of higher education specializing in entrepreneurial education with a focus on research and producing highly qualified experts Triple crown accredited | Higher Education | 🇭🇷 Zagreb | 534 | 1920 |
| 13 | [Hrvatski zavod za mirovinsko osiguranje (HZMO) - Croatian Pension Insurance Institute](https://www.tamtam.ai/c/hrvatski-zavod-za-mirovinsko-osiguranje-hzmo-croatian-pension-insurance) (mirovinsko.hr)<br>A public institution in Croatia implementing pension insurance based on generational solidarity, ensuring legality, timeliness, and quality of service through modern technology | Government Administration | 🇭🇷 Zagreb | 490 | 1922 |
| 14 | [Hrvatski zavod za zapošljavanje (HZZ) - Croatian Employment Service (CES)](https://www.tamtam.ai/c/hrvatski-zavod-za-zaposljavanje-hzz-croatian-employment-service-ces) (hzz.hr)<br>A public institution in Croatia addressing employment and unemployment issues through mediation and development of the labor market | Government Administration | 🇭🇷 Zagreb | 436 | 1906 |
| 15 | [APIS IT d.o.o.](https://www.tamtam.ai/c/apis-it-d-o-o) (apis-it.hr)<br>Leading Croatian ICT agency providing support for information systems and technologies, developing crucial systems for government entities, promoting eGovernment and modern technologies | IT Services and IT Consulting | 🇭🇷 Zagreb | 415 | 2005 |
| 16 | [University of Zagreb, Faculty of Science](https://www.tamtam.ai/c/university-of-zagreb-faculty-of-science) (pmf.unizg.hr)<br>The institution offers high-quality education and conducts research in natural sciences, mathematics, and interdisciplinary areas, with a focus on innovation and international collaboration | Higher Education | 🇭🇷 Zagreb | 400 |  |
| 17 | [Hrvatske šume d.o.o.](https://www.tamtam.ai/c/hrvatske-sume-d-o-o) (hrsume.hr)<br>Our organization focuses on sustainable forest management in Croatia, aiming to raise public awareness and promote the principles of sustainable development | Paper and Forest Product Manufacturing | 🇭🇷 Zagreb | 398 | 1991 |
| 18 | [Zagrebački holding d.o.o.](https://www.tamtam.ai/c/zagrebacki-holding-d-o-o) (zgh.hr)<br>A diversified group specializing in gas distribution, waste management, water services, road maintenance, property management, parking services, pharmaceuticals, and infrastructure development | Government Administration | 🇭🇷 Zagreb | 386 | 2006 |
| 19 | [Faculty of Humanities and Social Sciences, University of Zagreb](https://www.tamtam.ai/c/faculty-of-humanities-and-social-sciences-university-of-zagreb) (web2020.ffzg.unizg.hr)<br>Leading Croatian institution offering a wide range of academic degrees in humanities and social sciences, promoting interdisciplinary studies for practical applicability | Higher Education | 🇭🇷 Zagreb | 365 | 1874 |
| 20 | [School of Medicine University of Zagreb](https://www.tamtam.ai/c/school-of-medicine-university-of-zagreb) (mef.unizg.hr)<br>An internationally recognized academic institution offering graduate, doctoral, and specialist programs in biomedicine, healthcare, nursing, and neuroscience, focusing on excellence in education and research | Higher Education | 🇭🇷 Zagreb | 358 | 1917 |
| 21 | [University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture](https://www.tamtam.ai/c/university-of-zagreb-faculty-of-mechanical-engineering-and-naval-architecture) (linktr.ee)<br>Leading institution in mechanical, naval, and aeronautical engineering education, research, and expertise, with a century-old tradition of producing skilled engineers | Higher Education | 🇭🇷 Zagreb | 349 | 1919 |
| 22 | [HOPS Croatian Transmission System Operator Plc.](https://www.tamtam.ai/c/hops-croatian-transmission-system-operator-plc) (hops.hr)<br>Provider of electricity transmission and maintenance services in Croatia, focused on operating and expanding the national transmission network for secure and cost-effective energy supply | Utilities | 🇭🇷 Zagreb | 270 | 2013 |
| 23 | [Faculty of Transport and Traffic Sciences](https://www.tamtam.ai/c/faculty-of-transport-and-traffic-sciences) (fpz.unizg.hr)<br>Higher education institution specializing in transportation, logistics, and aeronautics training, fostering independent thinking, problem-solving skills, and professional values in students | Higher Education | 🇭🇷 Zagreb | 202 | 1962 |
| 24 | [HAMAG-BICRO - Croatian agency for SMEs, Innovations and Investments](https://www.tamtam.ai/c/hamag-bicro-croatian-agency-for-smes-innovations-and-investments) (hamagbicro.hr)<br>An agency in Croatia supporting SME development, promoting investments, implementing grant schemes, and facilitating innovation and technology transfer for economic growth | Financial Services | 🇭🇷 Zagreb | 194 | 1994 |
| 25 | [Hrvatsko mirovinsko osiguravajuće društvo d.d. (HRMOD)](https://www.tamtam.ai/c/hrvatsko-mirovinsko-osiguravajuce-drustvo-d-d-hrmod) (hrmod.hr)<br>The company handles pension payments from second and third pillars, as well as direct one-time contributions, ensuring competitiveness and quality service | Insurance | 🇭🇷 Zagreb | 36 | 2020 |

## 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.

## More company lists in Zagreb

- [The largest companies in Zagreb](https://www.tamtam.ai/l/largest-companies-zagreb) (198)
- [Multinational companies in Zagreb](https://www.tamtam.ai/l/multinational-companies-zagreb) (48)
- [Companies with a mobile app in Zagreb](https://www.tamtam.ai/l/companies-with-mobile-app-zagreb) (26)
- [Retail chains in Zagreb](https://www.tamtam.ai/l/retail-chains-zagreb) (26)
- [Critical infrastructure operators in Zagreb](https://www.tamtam.ai/l/critical-infrastructure-operators-zagreb) (25)

## The same list elsewhere in Croatia

- [Public sector organisations in Croatia](https://www.tamtam.ai/l/public-sector-organisations-croatia) (36)

## The same list elsewhere

- [Public sector organisations in the world](https://www.tamtam.ai/l/public-sector-organisations-in-the-world) (18,493)
- [Public sector organisations in Europe](https://www.tamtam.ai/l/public-sector-organisations-in-europe) (8,568)

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Source: https://www.tamtam.ai/l/public-sector-organisations-zagreb