# The 36 largest critical infrastructure operators in Bulgaria
Tamtam tracks 36 critical infrastructure operators headquartered in Bulgaria. This list ranks all of them by number of employees on LinkedIn, led by A1 Bulgaria, Vivacom and DSK Bank. Their median headcount is 395. Half of them were founded in 1994 or later. The most common headquarters are Sofia (27).
This selection of critical infrastructure operators in Bulgaria primarily comprises established companies in the banking and telecommunications sectors, alongside a few in insurance, healthcare, and utilities. Many of these are large firms, founded between the 1950s and early 2000s, reflecting a mature corporate landscape. For example, A1 Bulgaria provides communication and payment services, while DSK Bank is a retail and corporate bank. Postbank offers retail and wholesale banking products, and Vivacom is a digital telecom company.
A clear pattern among these companies is their strong concentration in the capital city. Almost all, including UniCredit Bulbank, United Bulgarian Bank, and Yettel.Bulgaria, have their headquarters in Sofia. The presence of EVN Bulgaria in Plovdiv is a notable exception.
๐ง๐ฌ Bulgaria ยท 36 companies ยท Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [A1 Bulgaria](https://www.tamtam.ai/c/a1-bulgaria) (a1.bg)
Leading provider of communication, payment, and entertainment services with mobile and fixed services, high-speed internet, TV channels, financial services, and ICT solutions | Telecommunications | ๐ง๐ฌ Sofia | 2,382 | 1994 |
| 2 | [Vivacom](https://www.tamtam.ai/c/vivacom) (vivacom.bg)
Innovative digital telecom company in Southeast Europe offering a wide range of telecommunications solutions, including 5G network, IoT, cloud services, and more | Telecommunications | ๐ง๐ฌ Sofia | 2,322 | |
| 3 | [DSK Bank](https://www.tamtam.ai/c/dsk-bank) (dskbank.bg)
Leading retail and corporate bank in Bulgaria with innovative branches, superior e-channels, high customer awareness, and preferred employer status. | Banking | ๐ง๐ฌ | 2,276 | 1951 |
| 4 | [Postbank (Eurobank Bulgaria AD)](https://www.tamtam.ai/c/postbank-eurobank-bulgaria-ad) (postbank.bg)
Bulgarian banking sector leader, offering retail and wholesale banking products including cards, loans, and savings, with a broad network and digital channels. | Banking | ๐ง๐ฌ Sofia | 1,986 | 1991 |
| 5 | [UniCredit Bulbank](https://www.tamtam.ai/c/unicredit-bulbank) (unicreditbulbank.bg)
A pan-European bank focused on creating opportunities for development, providing products and services, and unlocking potential for individuals, businesses, and communities | Banking | ๐ง๐ฌ Sofia | 1,841 | 1964 |
| 6 | [United Bulgarian Bank](https://www.tamtam.ai/c/united-bulgarian-bank) (ubb.bg)
Offers full spectrum of financial services, including banking, insurance, leasing, asset management, and factoring, as part of a major Bulgarian banking and insurance group. | Banking | ๐ง๐ฌ Sofia | 1,589 | 1992 |
| 7 | [tbi bank](https://www.tamtam.ai/c/tbi-bank) (tbibank.com)
A mobile-first challenger bank in South East Europe offering alternative payment solutions, financing, and shopping services to consumers and merchants | Banking | ๐ง๐ฌ Sofia | 1,495 | 2002 |
| 8 | [Yettel.Bulgaria](https://www.tamtam.ai/c/yettel-bulgaria) (yettel.bg)
A telecommunications provider in Bulgaria, offering connectivity and digital services to millions, with a focus on customer satisfaction and cutting-edge technology | Telecommunications | ๐ง๐ฌ Sofia | 1,092 | |
| 9 | [Raiffeisenbank Bulgaria](https://www.tamtam.ai/c/raiffeisenbank-bulgaria) (rbb.bg)
A banking institution in Bulgaria acquired by KBC Group, now operating as KBC Bank Bulgaria, with a focus on historical information rather than marketing | Banking | ๐ง๐ฌ Sofia | 1,090 | 1994 |
| 10 | [Mobiltel](https://www.tamtam.ai/c/mobiltel) (a1.bg)
Welcome to the world of providing high-quality digital solutions to meet all your needs in today's digital age Follow our official LinkedIn profile for updates and job postings | Telecommunications | ๐ง๐ฌ Sofia | 790 | 1994 |
| 11 | [First Investment Bank](https://www.tamtam.ai/c/first-investment-bank) (fibank.bg)
A leading bank in Bulgaria and the Balkan region offering innovative products, services, and career opportunities while contributing to the community | Banking | ๐ง๐ฌ Sofia | 771 | 1993 |
| 12 | [ProCredit Bank Bulgaria](https://www.tamtam.ai/c/procredit-bank-bulgaria) (procreditbank.bg)
A development-oriented bank offering excellent customer service to small and medium enterprises and individuals, focused on promoting savings and financial responsibility | Banking | ๐ง๐ฌ Sofia | 507 | 2001 |
| 13 | [DZI Insurance, KBC Group](https://www.tamtam.ai/c/dzi-insurance-kbc-group) (dzi.bg)
Leading Bulgarian insurance company offering diverse life and non-life insurance products, including bankassurance, serving retail and business clients. | Insurance | ๐ง๐ฌ Sofia | 444 | 1946 |
| 14 | [Acibadem City Clinic](https://www.tamtam.ai/c/acibadem-city-clinic) (acibademcityclinic.bg)
Leading Bulgarian group of hospitals with over 750 beds, 4 medical centers, and JCI accreditation, offering advanced technology and medical services Expanding to Varna and Burgas | Hospitals and Health Care | ๐ง๐ฌ Sofia | 437 | |
| 15 | [EVN Bulgaria](https://www.tamtam.ai/c/evn-bulgaria) (evn.bg)
A part of the EVN Group, we provide electricity to over 15 million customers in South-East Bulgaria, along with district heating services in Plovdiv | Utilities | ๐ง๐ฌ Plovdiv | 426 | 2005 |
| 16 | [Bulgaria Air](https://www.tamtam.ai/c/bulgaria-air) (air.bg)
National air carrier based in Bulgaria, offering scheduled and charter flights across Europe and Asia with modern Airbus and Embraer aircraft | Airlines and Aviation | ๐ง๐ฌ Sofia | 416 | |
| 17 | [Bulgarian National Bank](https://www.tamtam.ai/c/bulgarian-national-bank) (bnb.bg)
Established in 1879, the institution plays a key role in Bulgaria's economy by maintaining currency stability and developing the banking system | Banking | ๐ง๐ฌ Sofia | 400 | 1879 |
| 18 | [BULATSA](https://www.tamtam.ai/c/bulatsa) (bulatsa.com)
State-owned enterprise providing air navigation services in Bulgarian airspace and territorial waters, managing controlled civil airspace and a contract airspace over the Black Sea | Airlines and Aviation | ๐ง๐ฌ Sofia | 395 | 1969 |
| 19 | [Military Medical Academy](https://www.tamtam.ai/c/military-medical-academy) (vma.bg)
Alumni network connecting professionals in the medical and scientific fields to share knowledge and support academic growth for young individuals | Armed Forces | ๐ง๐ฌ Sofia | 391 | 1891 |
| 20 | [Vasil Levski Sofia Airport](https://www.tamtam.ai/c/vasil-levski-sofia-airport) (sofia-airport.eu)
The largest airport in Bulgaria, now managed by SOF Connect, aiming to develop and modernize facilities and services to attract more tourists | Airlines and Aviation | ๐ง๐ฌ Sofia | 332 | 1937 |
| 21 | [Electrohold](https://www.tamtam.ai/c/electrohold) (electrohold.bg)
A leading energy group in Bulgaria focused on power distribution, serving 3 million clients, investing in modernization, and aiming for regional expansion | Utilities | ๐ง๐ฌ Sofia | 330 | 2022 |
| 22 | [Allianz Bulgaria](https://www.tamtam.ai/c/allianz-bulgaria) (allianz.bg)
Leading provider of insurance and financial services in five sectors including general insurance, life insurance, retirement provision, banking services, and leasing | Financial Services | ๐ง๐ฌ Lozenets | 304 | 1991 |
| 23 | [Medical University - Pleven](https://www.tamtam.ai/c/medical-university-pleven) (mu-pleven.bg)
A leading medical university in Bulgaria offering comprehensive medical education, healthcare facilities, and research opportunities to students from various countries | Hospitals and Health Care | ๐ง๐ฌ Pleven | 295 | |
| 24 | [iCard](https://www.tamtam.ai/c/icard) (icard.com)
Fintech innovator offering end-to-end payment solutions to over 18 million clients in 30+ European countries, with a full suite of digital financial products and services | Financial Services | ๐ง๐ฌ Varna | 271 | 2007 |
| 25 | [Fraport Bulgaria](https://www.tamtam.ai/c/fraport-bulgaria) (fraport-bulgaria.com)
Specializes in operating and managing airports in Bulgaria, focusing on enhancing passenger experience, upgrading infrastructure, and training employees | Airlines and Aviation | ๐ง๐ฌ Varna | 244 | |
| 26 | [Municipal Bank](https://www.tamtam.ai/c/municipal-bank) (municipalbank.bg)
Universal commercial bank providing financial services and products, licensed for banking, securities trading, card operations, and servicing budget operators domestically and internationally | Banking | ๐ง๐ฌ Sofia | 188 | 1996 |
| 27 | [LEV INS Insurance Company](https://www.tamtam.ai/c/lev-ins-insurance-company) (lev-ins.com)
Leading insurance provider in Bulgaria with focus on general, life, and health insurance, as well as secondary retirement provision Emphasis on risk management and customer communication | Insurance | ๐ง๐ฌ Sofia | 182 | 1996 |
| 28 | [International Asset Bank](https://www.tamtam.ai/c/international-asset-bank) (iabank.bg)
A universal bank offering full range of financial services for corporate customers, small and mid-size enterprises, facilitating business growth and development | Banking | ๐ง๐ฌ Sofia | 128 | 1989 |
| 29 | [Societe Generale Expressbank](https://www.tamtam.ai/c/societe-generale-expressbank) (sgeb.bg)
Leading financial institution in Bulgaria, part of a global group, serving 400,000 clients with financial advice and supporting employee development | Banking | ๐ง๐ฌ Varna | 102 | 1993 |
| 30 | [Elektrorazpredelenie Yug](https://www.tamtam.ai/c/elektrorazpredelenie-yug) (elyug.bg)
Electricity distribution business operating in South East Bulgaria, managing grid operations and supplying energy to over 17 million customers | Utilities | ๐ง๐ฌ Plovdiv | 73 | 2005 |
| 31 | [Management Financial Group](https://www.tamtam.ai/c/management-financial-group) (mfg.bg)
A Bulgarian group providing financial inclusion through various financial and credit products in seven European countries and planning global expansion | Financial Services | ๐ง๐ฌ Sofia | 67 | 2005 |
| 32 | [UBB Pension Insurance, KBC Group](https://www.tamtam.ai/c/ubb-pension-insurance-kbc-group) (ubb-pensions.bg)
A company within the KBC Group in Bulgaria providing pension solutions through three funds, focusing on securing people's financial futures | Insurance | ๐ง๐ฌ Sofia | 51 | |
| 33 | [Expressbank](https://www.tamtam.ai/c/expressbank) (expressbank.bg)
A banking institution in Bulgaria, part of a larger group, serving over 500,000 customers with comprehensive financial products and services | Banking | ๐ง๐ฌ Sofia | 50 | 1993 |
| 34 | [Bulgarian Export Insurance Agency (BAEZ) JSC](https://www.tamtam.ai/c/bulgarian-export-insurance-agency-baez-jsc) (baez.bg)
The company provides export and domestic transaction insurance, offering protection against commercial and political risks to ensure financial stability and competitiveness for businesses | Insurance | ๐ง๐ฌ Sofia | 40 | 1998 |
| 35 | [DSK-Rodina](https://www.tamtam.ai/c/dsk-rodina) (dskrodina.bg)
A pension insurance company in Bulgaria offering a full range of pension products, managing four funds for supplementary pension insurance with over 951,000 insured individuals | Pension Funds | ๐ง๐ฌ Sofia | 29 | 1997 |
| 36 | [Tayaranjet.com](https://www.tamtam.ai/c/tayaranjet-com) (tayaranjet.com)
An airline focusing on national and international travel for tourists, institutions, and businesses, with a goal of providing direct, affordable, and convenient flights globally | Airlines and Aviation | ๐ง๐ฌ Sofia | 8 | 2017 |
## 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 Bulgaria
- [The largest companies in Bulgaria](https://www.tamtam.ai/l/largest-companies-bulgaria) (363)
- [Multinational companies in Bulgaria](https://www.tamtam.ai/l/multinational-companies-bulgaria) (105)
- [IT services companies in Bulgaria](https://www.tamtam.ai/l/it-services-companies-bulgaria) (51)
- [Software Development companies in Bulgaria](https://www.tamtam.ai/l/software-development-companies-bulgaria) (47)
- [Financial services firms in Bulgaria](https://www.tamtam.ai/l/financial-services-firms-bulgaria) (38)
- [IT Services and IT Consulting companies in Bulgaria](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-bulgaria) (37)
- [Retail chains in Bulgaria](https://www.tamtam.ai/l/retail-chains-bulgaria) (35)
- [Companies with in-house R&D in Bulgaria](https://www.tamtam.ai/l/r-and-d-companies-bulgaria) (28)
- [Companies with a mobile app in Bulgaria](https://www.tamtam.ai/l/companies-with-mobile-app-bulgaria) (28)
- [Manufacturers in Bulgaria](https://www.tamtam.ai/l/manufacturers-bulgaria) (27)
## The same list elsewhere in Bulgaria
- [Critical infrastructure operators in Sofia](https://www.tamtam.ai/l/critical-infrastructure-operators-sofia) (27)
## 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)
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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-bulgaria