From the Journal of Commerce:

Maersk isn’t the only carrier with a terminal relationship [with APM Terminals], with its three closest rivals all involved in the port business — essentially bolt-ons to their core container businesses and with much lower profiles. Mediterranean Shipping Co. owns 65 percent of Terminal Investments — U.S.-based Global Infrastructure Partners acquired a 35 percent stake for $1.9 billion in 2013. CMA CGM owns 51 percent of Terminal Link, with the remainder held by China Merchant Holdings and the French carrier itself is 24 percent owned by Turkey’s Yildirim group whose Yilport subsidiary is racing up the terminal rankings. The newly merged China Cosco Shipping Group owns Cosco Shipping Ports, the former Cosco Pacific, which has been expanding into Europe, most notably transforming the sleepy Greek port of Piraeus into a top European transshipment hub.

More at the JOC