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Cie. de Fives-Lille Engineering Co, of Fives, near Lille, France.
Began as Parent, Schaken, Caillet et Cie in 1861, and formed a joint venture with the Société J. F. Cail & Cie. Basile Parent and Pierre Schaken were of Belgian origin. The works at Fives specialised in the production of railway equipment. Another plant in Givors on the Rhône specialized in wheelsets for railway rolling stock.
1865 The business became the Compagnie de Fives-Lille.
1868 Became the Compagnie de Fives-Lille pour constructions mécaniques et entreprises. It appears that the Cail company kept its separate identity and did not merge with Fives-Lille until 1958. Later, it changed its name to "Fives-Lille-Cail" and then to "Fives-Cail-Babcock" and finally to "Fives", in 2007.
The above information is from the Wikipedia entry (English version, accessed 30 June 2019).
Company history 'Fives, 200 years of industrial revolutions' here (119 page pdf).