CTT – Correios de Portugal, S.A. is a Portuguese company that operates as both the national postal service of Portugal and a commercial group with subsidiaries operating in banking, e-commerce, and other postal services. It was founded in 1520 by King Manuel I of Portugal, during the Portuguese Renaissance, and CTT is the oldest company still in operation in Portugal to this day. The acronym CTT comes from the company's former name, which was also the designation of postal services for the former Portuguese Colonies and is still used for CTT – Post of Macau today. In 1991, CTT became a public limited company, and in December 2013 its shares were listed on Euronext Lisbon. In 2007, CTT began to offer a mobile phone service in Portugal, under the brand name Phone-ix. Phone-ix was closed down on 1 January 2019. In 2014, CTT was privatized by the Portuguese government to raise money and comply with European Union requirements for its bailout. In the previous year, 70% of the CTT shares had already been tendered. Its current and longest-running visual identity were receiving subsequent redesigns in July 2015 and March 2020, but its logo remains virtually unchanged. Wikipedia