Companc competed initially in the world series, through the production car-based Group N category. He debuted on his home event in 2001. He then won the Argentina Rally Championship in 2005. His profile heightened for the 2006 season, when he assumed a place in the newly formed Stobart VK M-Sport Ford team alongside the teenager Matthew Wilson, son of Malcolm Wilson, the boss of both the Stobart VK squad and the Blue Oval marque's more senior manufacturer-backed works team, which would incidentally go on to win the world manufacturers' title that year.
Having initially fared on the early season rallies with older, 2004-specification Ford Focus WRCs, both Companc and Wilson would eventually be entrusted with examples of the 2006 championship-winning car, an arrangement which persisted into the 2007 season. Aboard the Focus, Companc competed on eight rallies in all in 2006, while planning ten rounds for the following year, and scored his first WRC points on the 2006 Rally New Zealand. Companc's team for 2007, Munchi's Ford World Rally Team chose to pair him with fellow native, Juan Pablo Raies, who was in turn co-driven by Pérez Companc's brother, Jorge. When Raies was replaced in the Munchi's team's post-Rally Argentina lineup by Federico Villagra, winner of that rally in Group N, Jorge Pérez Companc continued his co-driving duties in the second car, with the exception of Rally Japan when Villagra was co-driven by José Díaz, according to personal problems of Jorge.
In 2008 Companc will switch to sports car racing, running a Ferrari F430 for Advanced Engineering in the FIA GT Championship, while competing in selected WRC events for the Munchi's team, his final rally being Rally Finland.