Antonios Kyriazis

Upstream Telecommunications & Software Systems SA operates a commerce platform that engages in the provision of mobile marketing services for mobile operators, M-commerce, developers, service providers, and publishers. It offers insights, and mobile solutions. The firm also offers direct marketing and mobile customer billing services. The company was founded by Alex Vratskides and Marco Veremis in 2001 and is headquartered in Gerakas, Greece.

Play Topco SA engages in the provision of mobile telecommunications services. It also involves in managing a distribution network of mobile telecommunications products under the brand, PLAY. The company was founded on July 17, 2014 and is headquartered in Luxembourg.

Westnet Distribution SA wholesales computer and peripheral products. It also offers mobiles, cameras and accessories, tablets, servers and storage and backup devices. The company was founded in 2005 and is headquartered in Kifisia, Greece.

P4 Sp zoo engages in the operation of mobile telecommunications network. It provides voice, data transmission services, messaging, video service as well as value added services and sales of handsets and other devices to individual and business subscribers. The company was founded in 2006 and is headquartered in Warsaw, Poland.

Germanos SA provides mobile telecommunication services and equipment. It offers mobile and fixed telephony, and internet services. The company was founded in 1989 and is headquartered in Agios Stefanos, Greece.

Dell, Inc. engages in the manufacture of electronic devices. Its products include laptops, desktops, tablets, thin clients, printers, monitors, software, workstations and accessories. The company was founded by Michael Saul Dell on February 1, 1984 and is headquartered in Round Rock, TX.

Olympia Group SA wholesales telephones and other telecommunications equipment. The company was founded by Panos Germanos and is headquartered in Athens, Greece.

Retail World SA, operating under the brand name Public, is a leading destination for technology and entertainment products. The private company is based in Athens, Greece. The Greek company offers thousands of products for every member of the family.

Deloitte & Touche LLP engages in the provision of audit, advisory, financial advisory, tax, and consulting services. The company was founded on March 7, 1995 and is headquartered in New York, NY.

Upstream Marketing Programs Ltd. is a British mobile technology company founded in 2012. The private company is based in London, UK. Upstream specializes in driving digital acquisitions and sales across every mobile channel available.