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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 4,540 | ||||
| 2 |
Hrvatski Telekomhrvatskitelekom.hr
Leading Croatian telecommunications company offering fixed, mobile, internet, and international communication services with focus on innovation and customer satisfaction. |
2,426 | |||
| 3 |
Zagrebačka bankazaba.hr
Empowering community development and unlocking individual and collective potential across Europe through a pan-European banking network focused on integrity and responsibility |
2,063 | |||
| 4 | 2,058 | ||||
| 5 |
Privredna banka Zagreb d. d.pbz.hr
A leading financial institution offering a wide range of banking services to individuals and businesses, with a strong international presence |
1,644 | |||
| 6 |
Croatia osiguranje d.d.crosig.hr
Leading insurance provider in Croatia offering various types of insurance, supporting national economy, embracing social responsibility, and focusing on innovative products and client satisfaction |
1,410 | |||
| 7 |
A1 Hrvatska d.o.o.a1.hr
Digital solutions provider in Central and Eastern Europe, offering innovative services and communications solutions to simplify and enhance customer experiences |
1,296 | |||
| 8 |
University Hospital Centre Zagreb, Croatiakbc-zagreb.hr
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 |
1,201 | |||
| 9 |
Hrvatska poštanska banka, dioničko društvohpb.hr
A leading Croatian financial institution with a focus on knowledge, innovation, and community responsibility, serving a large client base across the country |
912 | |||
| 10 |
Financijska agencija - Finafina.hr
Leading Croatian provider of financial and electronic services, operating on a market principle, collaborating with banks, institutions, and businesses on various projects nationwide |
903 | |||
| 11 |
Raiffeisenbank Hrvatskarba.hr
A financial institution offering simple, fast, and professional financing and asset management services while striving to positively impact society and the environment |
894 | |||
| 12 |
Croatia Airlinescroatiaairlines.com
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 |
790 | |||
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. | |||||
| 13 |
Addiko Bank Hrvatskaaddiko.hr
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 |
763 | |||
| 14 |
Sestre milosrdnice University Hospital Centerkbcsm.hr
A leading healthcare institution in Croatia, offering a wide range of medical services, scientific activities, and hosting educational facilities |
685 | |||
| 15 |
Croatian National Bankhnb.hr
A central bank part of the Eurosyste, responsible for maintaining price stability and financial system stability, and participates in the EU monetary policy implementation |
642 | |||
| 16 |
Telemach Hrvatskatelemach.hr
A leading provider of telecommunications and media services in Southeast Europe, offering top-notch customer value, cutting-edge technology, and community engagement |
592 | |||
| 17 |
VIPnet d.o.o.a1.hr
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 |
563 | |||
| 18 |
Hrvatski zavod za mirovinsko osiguranje (HZMO) - Croatian Pension Insurance Institutemirovinsko.hr
A public institution in Croatia implementing pension insurance based on generational solidarity, ensuring legality, timeliness, and quality of service through modern technology |
490 | |||
| 19 |
Zagrebački holding d.o.o.zgh.hr
A diversified group specializing in gas distribution, waste management, water services, road maintenance, property management, parking services, pharmaceuticals, and infrastructure development |
386 | |||
| 20 |
Sberbank d.d. Croatiasberbank.hr
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 |
363 | |||
| 21 |
Wiener osiguranje Vienna Insurance Group d.d.wiener.hr
A leading insurance provider in Croatia, offering a wide range of services through a strong sales network and dedicated employees |
274 | |||
| 22 |
HOPS Croatian Transmission System Operator Plc.hops.hr
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 |
270 | |||
| 23 |
KentBank d.d.kentbank.hr
A boutique bank in Croatia focusing on retail and SME clients, offering advanced digital banking services and a unique networking concept |
190 | |||
| 24 | 187 | ||||
| 25 |
Raiffeisen mirovinski fondovirmf.hr
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 |
37 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 198
- Multinational companies in Zagreb 48
- Companies with a mobile app in Zagreb 26
- Retail chains in Zagreb 26
- Public sector organisations in Zagreb 25