OTE Group is the largest technology company in Greece, offering a wide range of services including fixed-line, mobile, broadband, and television services. Founded in 1949 as the state-owned Hellenic Telecommunications Organization (OTE), it was later privatized in 1996 and is now listed as one of the three largest companies on the Athens Stock Exchange.

OTE Group currently operates in Greece, Romania, and Albania, serving millions of customers with its modern and reliable network infrastructure. It also offers advanced ICT solutions for businesses and governments, as well as satellite services through its subsidiary Hellas Sat. The company has received numerous awards and recognitions for its quality of services and commitment to corporate social responsibility, including being named one of the World's Most Ethical Companies by Ethisphere Institute for several consecutive years. The Group also opened a museum that is now a member of the International Committee for the Conservation of the Industrial Heritage (T.I.C.C.I.H.) that is dedicated to the research, study, and documentation of historical data pertaining to the evolution of telecommunications from ancient times to the present day.

As of April 2023, OTE Group has a market cap of $6.40 Billion. According to OTE Group's latest financial reports, the company's current revenue (TTM) is $4.08 B. In 2018 the company made a revenue of $4.46 B an increase over the years 2017 revenue that was $4.43 B. Today, OTE Group employs about 13,000 people in Greece and approximately 20,000 in total.

Founded: 1949
Headquarters: Athens, Greece
Website: https://www.cosmote.gr/cs/otegroup/gr/corp_homepage.html

OPAP (Organization of Football Prognostics) is a Greek company that specializes in the operation of lottery and sports betting games. It was founded in 1958 as a state-owned organization, but it became privatized in 2013 and is now also listed on the Athens Stock Exchange. The company has a strong presence in Greece, with more than 4,000 points of sale nationwide, as well as operations in Cyprus and other countries.

OPAP offers a wide range of gaming products, including numerical lottery games, sports betting, instant win games, and scratch cards. Its flagship product is PROPO, a popular sports betting game that allows players to bet on the outcome of football matches and win large cash prizes. The other games that OPAP is currently running are 6 out of 36, LOTTO, PROTO, PROPOGOAL, TZOKER, PAME STOIXIMA, SUPER 3, EXTRA 5, KINO, PAME STOIXIMA VIRTUAL SPORTS, POWERSPIN, etc. The company also supports various social responsibility initiatives, such as sports and cultural events, environmental programs, and charitable causes.

As of April 2023, OPAP has a market cap of $6.04 Billion. According to OPAP's latest financial reports, the company's current revenue (TTM) is $1.39 B. In 2021 the company made a revenue of $1.21 B an increase over the year 2020 revenue which was $0.85 B. As of 2020, OPAP employs about 3716 people in total.

Founded: 1958
Headquarters: Athens, Greece
Website: https://www.opap.gr/

Eurobank Ergasias Services and Holdings is a Greek banking group that provides a wide range of financial services to individuals, businesses, and institutional clients. It was founded as "V. Karavasilis Tobacco Company and Bank SA" in 1924. It was renamed "Karavasilis Bank SA" in 1937 and "Professional Credit Bank SA" in 1952. It was purchased by the National Bank of Greece in 1964 and renamed the Bank of Athens in 1992.

Eurobank offers a variety of banking products and services, including deposits, loans, credit cards, investment products, insurance, and online banking. It also provides specialized services for corporate and investment banking, asset management, and private banking. As of 2022, Eurobank has more than 616 branches and more than 16,000 employees, as well as operations in Bulgaria, Cyprus, Serbia, the UK, and other countries. Eurobank is also involved in various social responsibility initiatives focusing on education, culture, health, and environmental protection.

As of April 2023, Eurobank Ergasias Services and Holdings has a market cap of $5.39 Billion. According to Eurobank Ergasias Services and Holdings's latest financial reports, the company's current revenue (TTM) is $2.91 B. In 2021 the company made a revenue of $2.21 B a decrease over the year 2020 revenue that was $2.51 B.

Founded: 1924
Headquarters: Athens, Greece
Website: https://www.eurobankholdings.gr/en/

The National Bank of Greece (NBG) is the oldest and one of the largest commercial banks in Greece, founded way back in 1841. The bank plays a pivotal role in the country's financial sector, supporting Greek businesses and households and contributing to the economy's growth.

The National Bank of Greece offers a wide range of financial products and services, including retail banking, corporate banking, investment banking, asset management, insurance, and online banking. Its network includes more than 500 branches throughout Greece, as well as operations in other countries, such as Cyprus, Albania, Bulgaria, Romania, and Serbia. The company's activities in Greece generate 85% of its pretax pre-provision earnings, with Southeastern Europe accounting for the remaining 15%. The bank's strengths lie in its extensive experience and expertise in the Greek market, as well as its commitment to innovation, digitalization, and sustainability. It is also recognized for its international presence and partnerships, which allow it to offer global solutions to its clients.

As of April 2023, the National Bank of Greece has a market cap of $4.81 Billion. According to the National Bank of Greece's latest financial reports, the company's current revenue (TTM) is $2.00 B. In 2021 the company made a revenue of $2.12 B a decrease over the year 2020 revenue that was $2.98 B. Today, the bank employs about 9000 people.

Founded: 1841
Headquarters: Athens, Greece
Website: https://www.nbg.gr/

Mytilineos Holdings or Mytilineos is a Greek industrial conglomerate that operates in a wide range of sectors, including energy, metal trading, engineering, procurement, and construction. Founded in 1990, the company has grown rapidly to become one of the largest and most diversified industrial groups that play a crucial role in Greece's industrial and energy sectors.

Mytilineos Holdings' energy division is a key player in Greece's power sector, specializing in power plants and renewable energy projects. It generates electricity from lignite, natural gas, and renewable energy sources such as solar and wind power, and it also provides energy trading and supply services. The company's metallurgy division specializes in the production and trading of aluminum, copper, and other metals, serving customers in Europe, Asia, and Africa. Its engineering division offers turnkey solutions for complex industrial and infrastructure projects, including design, construction, and maintenance services. The company is also involved in various social responsibility initiatives, supporting local communities, education, culture, and environmental protection.

As of April 2023, Mytilineos Holdings has a market cap of $4.07 Billion. According to Mytilineos Holdings's latest financial reports, the company's current revenue (TTM) is $1.52 B. In 2014 the company made a revenue of $1.61 B a decrease over the year 2013 revenue that was $1.86 B. The company now has a total of around 5000 employees in total (as of 2021).

Founded: 1990
Headquarters: Maroussi, Greece
Website: https://www.mytilineos.com/

Public Power Corporation (PPC) is the largest electricity generation and distribution company in Greece, providing a reliable supply of electricity to households, businesses, and industries throughout the country. Founded in 1950 as a state-owned corporation, PPC has since become a publicly traded company with headquarters in Athens. It plays a crucial role in Greece's energy sector, delivering affordable and sustainable electricity to millions of customers while contributing to the country's economic and social development.

Public Power Corporation generates electricity from a variety of sources, including lignite, natural gas, hydroelectric power, and renewable energy sources such as wind and solar power. It operates a diverse portfolio of power plants and is gradually transitioning towards cleaner and more sustainable forms of energy production. PPC is now made up of three subsidiaries: PPC S.A., the Hellenic Electricity Distribution Network Operator (HEDNO or DEDDIE) S.A., and PPC RENEWABLES S.A. The company distributes electricity to more than 7 million customers in Greece and offers a range of related services such as billing, customer support, and energy efficiency solutions. Moreover, PPC is also involved in various social responsibility initiatives, supporting environmental protection, education, health, culture, and sports.

As of April 2023, Public Power Corporation has a market cap of $3.40 Billion. According to Public Power Corporation's latest financial reports, the company's current revenue (TTM) is $6.34 B. In 2014 the company made a revenue of $7.65 B a decrease over the year 2013 revenue that was $7.93 B. As of 2021, OPAP employs about 12909 people in total.

Founded: 1950
Headquarters: Athens, Greece
Website: https://www.dei.gr/en/

Jumbo S.A. or Jumbo, Jumbo Anonymi Etairia is a Greek retail company that specializes in the sale of children's toys, games, and accessories. The company was incorporated in 1986 and has its headquarters in Moschato, part of the Athens Urban Area. Since then, it has grown to become the largest toy retailer in Greece and one of the leading players in the European market.

In 2021, Jumbo S.A. operates 86 stores, 55 of which are located in Greece, 6 in Cyprus, 10 in Bulgaria, and 16 in Romania. Furthermore, the Company has a presence in six countries through collaborations, with 27 stores operating under the Jumbo name in Albania, Kosovo, Serbia, North Macedonia, Montenegro, and Bosnia and Herzegovina. Its product range includes a wide variety of toys, from dolls and action figures to board games and puzzles, as well as party supplies, costumes, and educational toys. The company is known for its affordable prices, high-quality products, and customer-friendly services, such as its loyalty program and online shopping platform. It also invests heavily in research and development, constantly innovating and expanding its product lines to meet changing consumer needs.

As of April 2023, Jumbo S.A. has a market cap of $3.08 Billion. According to Jumbo S.A.'s latest financial reports, the company's current revenue (TTM) is $0.67 B. In 2014 the company made a revenue of $0.73 B an increase over the year 2013 revenue that was $0.70 B. As of 2020, the company employs about 6,644 people in total.

Founded: 1986
Headquarters: Moschato, Greece
Website: https://www.e-jumbo.gr/

Piraeus Financial Holdings is a Greek financial services group that provides banking, asset management, insurance, and other financial products and services to individuals, businesses, and institutions. the company was founded in 1916 and has since established itself as one of the largest and most dynamic financial groups in Greece. The company's shares have been listed on the Athens Stock Exchange (ATHEX) since January 1918, only 2 years after being founded.

Piraeus Bank, the group's flagship subsidiary, operates a network of more than 500 branches in Greece and abroad, offering a wide range of banking services. It is known for its customer-centric approach, innovative digital solutions, and commitment to sustainable development. Additionally, Piraeus Financial Holdings also includes subsidiaries such as Piraeus Asset Management, Piraeus Insurance, and Piraeus Leasing, providing specialized services in investment management, risk protection, and equipment financing, respectively.

As of April 2023, Piraeus Financial Holdings has a market cap of $3.07 Billion. According to Piraeus Financial Holdings's latest financial reports, the company's current revenue (TTM) is $2.43 B. In 2021 the company made a revenue of $2.56 B an increase over the year 2020 revenue which was $2.17 B. The company now has a total of around 9000 employees in total.

Founded: 1916
Headquarters: Athens, Greece
Website: https://www.piraeusholdings.gr/

Alpha Services and Holdings is the fourth-largest Greek bank by total assets, after Eurobank, National Bank of Greece, and Piraeus Bank, which are also on this list. Therefore, the company is also a leading financial institution in Greece, providing banking, asset management, insurance, and other financial products and services to millions of customers. Alpha Services and Holdings was founded in 1879 and since then has been a reputable financial company in Greece.

Alpha Services and Holdings' flagship subsidiary is Alpha Bank. As of 2021, the bank has over 450 branches throughout Greece and overseas and provides a comprehensive variety of financial services including deposits, loans, credit cards, investment products, and Internet banking. Moreover, Alpha Services and Holdings also includes subsidiaries such as Alpha Asset Management, Alpha Insurance, and Alpha Leasing. The group has a high emphasis on sustainability, supporting environmental, social, and governance aspects in its operations and investment decisions.

As of April 2023, Alpha Services and Holdings has a market cap of $3.04 Billion. According to Alpha Services and Holdings' latest financial reports, the company's current revenue (TTM) is $2.40 B. In 2021 the company made a revenue of -$0.48 B a decrease over the year 2020 revenue which was $3.00 B. Today, the company employs more than 8000 people in Greece.

Founded: 1879
Headquarters: Athens, Greece[
Website: https://www.alphaholdings.gr/

HELLENiQ ENERGY or HELLENiQ ENERGY Holdings Societe Anonyme is a Greek renewable energy company that specializes in the development, construction, and operation of large-scale solar and wind power projects. The company's roots date to 1958 with the establishment of the first oil refinery in Greece, Public Petroleum Corporation. It changed its name in 1998 as the result of a corporate reorganization and now is a consortium of six subsidiaries and a number of other firms over which it has varied degrees of management control.

HELLENiQ ENERGY's portfolio includes several solar parks and wind farms across Greece, with a total installed capacity of more than 300 MW. Its projects are characterized by their high efficiency, state-of-the-art technology, and a strong focus on sustainability, minimizing environmental impact and promoting local economic development. Especially, the company is known for its innovative spirit, constantly exploring new ways to harness renewable energy sources and integrate them into the grid. It also provides consulting and engineering services to other companies and organizations interested in developing renewable energy projects.

As of April 2023, HELLENiQ ENERGY has a market cap of $2.51 Billion. According to the latest financial reports, the company's current revenue (TTM) is $15.19 B. In 2021 the company made a revenue of $10.70 B an increase over the year 2020 revenue that was $6.67 B. In 2020, the company has a total of 3500 employees.

Founded: 1958
Headquarters: Athens, Greece
Website: https://www.helpe.gr/en/