Founders - Christian Guillemot, Claude Guillemot, Gérard Guillemot, Michel Guillemot, Yves Guillemot

First location - Carentoir, France

Ubisoft Entertainment is a French video game company headquartered in Montreuil with several development studios across the world.

The Guillemot family had established themselves as a farming support business for farmers in the Brittany province in northwest France and nearby regions, including into the United Kingdom. The five sons of the family – Christian, Claude, Gérard, Michel and Yves – helped with the sales, press release distribution, accounting and management of the company with their parents prior to university. All five gained business experience while at university, which they brought back to the family business to help improve it, at a time where farming businesses were starting to wane. The brothers came up with the idea of diversification to sell other products of use to farmers; Claude began with selling CD audio media, and later the brothers expanded to computers and additional software which included video games.

In the early 1980s, they saw that the costs of buying computers and software from a French supplier was more expensive than buying the same materials in the United Kingdom and shipping to France, and came upon the idea of a mail-order business around computers and software. Their mother said they could start their own business this way as long as they managed it themselves and equally split its shares between the five of them. Their first business was Guillemot Informatique, founded in 1984.

They originally only sold through mail order, but soon were getting orders from French retailers, since they were able to undercut other suppliers by up to 50% of the cost of new titles. By 1986, this company was earning about 40 million French francs (roughly US$5.8 million at that time). In 1985, the brothers established Guillemot Corporation for similar distribution of computer hardware. As demand continued, the brothers recognised that video game software was becoming a lucrative property, and decided that they needed to get into the development side of the industry, already having insight on the publication and distribution side.Ubi Soft was founded by the brothers on 28 March 1986 The name "Ubi Soft" was selected to represent "ubiquitous" software.

Zombi, an icon-driven action adventure video game, was Ubi Soft's first publication, released in 1986.