Maersk, also known as simply Maersk, is a Danish business conglomerate with activities in the transport, logistics and energy sectors. Maersk has been the largest container ship and supply vessel operator in the world since 1996. The company is based in Copenhagen, Denmark, with subsidiaries and offices across 130 countries and around 80,220 employees in 2018. 

In September 2016, Maersk Group announced splitting into two separate divisions: transport & logistics, and energy. The company's 2018 annual revenue was US$39 billion (2019). 

The largest operating unit in A.P. Moller–Maersk by revenue and staff (around 25,000 employees in 2012) is Maersk Line.

In 2013, the company described itself as the world's largest overseas cargo carrier and operated over 600 vessels with 3.8 million twenty-foot equivalent unit (TEU) container capacity.

As of September 2015, as the largest container fleet, it held 15.1% of the global TEU. 

According to en.wikipedia