# List of critical infrastructure operators in Zagreb

Tamtam tracks 25 critical infrastructure operators headquartered in Zagreb. This list ranks all of them by number of employees on LinkedIn, led by INA Grupa, Hrvatski Telekom and Zagrebačka banka. Their median headcount is 763. Half of them were founded in 1991 or later.

These major critical infrastructure operators in Zagreb primarily comprise established companies in the financial, energy, and telecommunications sectors. Among them, INA Grupa is involved in oil and gas exploration and distribution, while Hrvatski Telekom is a leading telecommunications provider. Zagrebačka banka and Privredna banka Zagreb d.d. are prominent financial institutions, and HEP is the national electricity provider. Croatia osiguranje d.d. is a major insurance company.

A notable characteristic of these organizations is their long-standing presence; several were founded in the late 19th or early 20th century, such as HEP (1884), Zagrebačka banka (1914), and Croatia osiguranje d.d. (1884). All listed companies have their headquarters in Zagreb, indicating a concentration of critical infrastructure management within the city.

🇭🇷 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 | [Hrvatski Telekom](https://www.tamtam.ai/c/hrvatski-telekom) (hrvatskitelekom.hr)<br>Leading Croatian telecommunications company offering fixed, mobile, internet, and international communication services with focus on innovation and customer satisfaction. | Telecommunications | 🇭🇷 Zagreb | 2,426 |  |
| 3 | [Zagrebačka banka](https://www.tamtam.ai/c/zagrebacka-banka) (zaba.hr)<br>Empowering community development and unlocking individual and collective potential across Europe through a pan-European banking network focused on integrity and responsibility | Banking | 🇭🇷 Zagreb | 2,063 | 1914 |
| 4 | [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 |
| 5 | [Privredna banka Zagreb d. d.](https://www.tamtam.ai/c/privredna-banka-zagreb-d-d) (pbz.hr)<br>A leading financial institution offering a wide range of banking services to individuals and businesses, with a strong international presence | Banking | 🇭🇷 Zagreb | 1,644 | 1966 |
| 6 | [Croatia osiguranje d.d.](https://www.tamtam.ai/c/croatia-osiguranje-d-d) (crosig.hr)<br>Leading insurance provider in Croatia offering various types of insurance, supporting national economy, embracing social responsibility, and focusing on innovative products and client satisfaction | Insurance | 🇭🇷 Zagreb | 1,410 | 1884 |
| 7 | [A1 Hrvatska d.o.o.](https://www.tamtam.ai/c/a1-hrvatska-d-o-o) (a1.hr)<br>Digital solutions provider in Central and Eastern Europe, offering innovative services and communications solutions to simplify and enhance customer experiences | Telecommunications | 🇭🇷 Zagreb | 1,296 | 1999 |
| 8 | [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 |  |
| 9 | [Hrvatska poštanska banka, dioničko društvo](https://www.tamtam.ai/c/hrvatska-postanska-banka-dionicko-drustvo) (hpb.hr)<br>A leading Croatian financial institution with a focus on knowledge, innovation, and community responsibility, serving a large client base across the country | Banking | 🇭🇷 Zagreb | 912 | 1991 |
| 10 | [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 |  |
| 11 | [Raiffeisenbank Hrvatska](https://www.tamtam.ai/c/raiffeisenbank-hrvatska) (rba.hr)<br>A financial institution offering simple, fast, and professional financing and asset management services while striving to positively impact society and the environment | Financial Services | 🇭🇷 Zagreb | 894 | 1994 |
| 12 | [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 |
| 13 | [Addiko Bank Hrvatska](https://www.tamtam.ai/c/addiko-bank-hrvatska) (addiko.hr)<br>Focused on delivering value through basic banking products, prioritizing quality over quantity Simplifying processes, providing clear communication, and personalized service for a positive client experience | Banking | 🇭🇷 Zagreb | 763 | 1996 |
| 14 | [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 |
| 15 | [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 |
| 16 | [Telemach Hrvatska](https://www.tamtam.ai/c/telemach-hrvatska) (telemach.hr)<br>A leading provider of telecommunications and media services in Southeast Europe, offering top-notch customer value, cutting-edge technology, and community engagement | Telecommunications | 🇭🇷 Zagreb | 592 |  |
| 17 | [VIPnet d.o.o.](https://www.tamtam.ai/c/vipnet-d-o-o) (a1.hr)<br>Leader in Croatian telecom, offering comprehensive 5-play services with cutting-edge technologies Part of global telecom groups with focus on customer satisfaction and innovation | Telecommunications | 🇭🇷 Zagreb | 563 | 1998 |
| 18 | [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 |
| 19 | [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 |
| 20 | [Sberbank d.d. Croatia](https://www.tamtam.ai/c/sberbank-d-d-croatia) (sberbank.hr)<br>Leading financial institution in Russia with a strong presence in Central and Eastern Europe, offering a wide range of banking services to individual and corporate clients | Banking | 🇭🇷 Zagreb | 363 |  |
| 21 | [Wiener osiguranje Vienna Insurance Group d.d.](https://www.tamtam.ai/c/wiener-osiguranje-vienna-insurance-group-d-d) (wiener.hr)<br>A leading insurance provider in Croatia, offering a wide range of services through a strong sales network and dedicated employees | Insurance | 🇭🇷 Zagreb | 274 |  |
| 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 | [KentBank d.d.](https://www.tamtam.ai/c/kentbank-d-d) (kentbank.hr)<br>A boutique bank in Croatia focusing on retail and SME clients, offering advanced digital banking services and a unique networking concept | Banking | 🇭🇷 Zagreb | 190 | 1998 |
| 24 | [ENNA](https://www.tamtam.ai/c/enna) (enna.hr)<br>A rapidly growing company in Croatia, Energia Naturalis group manages various operations including natural gas distribution, renewable energy, trading, and investment projects | Investment Management | 🇭🇷 Zagreb | 187 | 2010 |
| 25 | [Raiffeisen mirovinski fondovi](https://www.tamtam.ai/c/raiffeisen-mirovinski-fondovi) (rmf.hr)<br>A financial institution managing mandatory and voluntary pension funds, aiming to provide the best service for members and ensure a dignified retirement in the future | Pension Funds | 🇭🇷 Zagreb | 37 | 2001 |

## 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)
- [Public sector organisations in Zagreb](https://www.tamtam.ai/l/public-sector-organisations-zagreb) (25)

## The same list elsewhere in Croatia

- [Critical infrastructure operators in Croatia](https://www.tamtam.ai/l/critical-infrastructure-operators-croatia) (34)

## The same list elsewhere

- [Critical infrastructure operators in the world](https://www.tamtam.ai/l/critical-infrastructure-operators-in-the-world) (23,312)
- [Critical infrastructure operators in Europe](https://www.tamtam.ai/l/critical-infrastructure-operators-in-europe) (9,815)

---

Source: https://www.tamtam.ai/l/critical-infrastructure-operators-zagreb