Neste Oyj, (former name: Neste Oil Corporation) is an oil refining and marketing company located in Espoo, Finland.  It produces, refines and markets oil products and provides engineering services, as well as licensing production technologies. Neste has operations in 14 countries and employs over 5,000 people.

The company is the largest producer of renewable diesel in the world. 

Neste has conventional oil refineries, at Porvoo and Naantali in Finland, and two renewable diesel refineries, in Singapore and in Rotterdam, Netherlands.  Two renewable diesel plants have also located at the Porvoo refinery. 

Together, these produce 0.525 million tons annually, which is approximately one fifth of the diesel consumption in Finland. Neste's production facility in Singapore is the largest renewable diesel refinery in the world, boasting a capacity of 1.1 million metric tonnes per annum.

A planned new production line is expected to increase its capacity by one million tonnes by 2022. In addition to its own refineries, Neste has stakes in a base oil plant in Bahrain and in Nynas AB, which produces naphthenic oil and bitumen.

According to en.wikipedia