Campomaiorense was first promoted to the Primeira Liga in 1995 under the guidance of former Sporting CP star striker Manuel Fernandes. The club was only the third club in the Alentejo region to reach the top division. Their spell in the 1995–96 season saw a disappointing campaign, starting the championship with a 7–0 defeat away to Sporting CP and eventually leading to relegation. Further poor results eventually forced club chairman João Manuel Nabeiro to terminate Fernandes. New players arrived in mid-season, among them Jimmy Floyd Hasselbaink, who had just left Dutch club AZ. Former Portuguese international Diamantino Miranda was given the job with the objective of taking the club back into the first league. Campomaiorense finished in 17th position. The 1996–97 season in the second division earned them a first ever championship title, with former Chaves and Paços de Ferreira striker Rudi being the top goal scorer. However, Diamantino's season in first division football was no better than Campomaiorense's first spell and he was also terminated by Nabeiro mid-season. Christmas brought coach João Alves along with Brazilian players such as Isaías and Demétrios. Alves' efforts earned Campomaiorense the 11th place and another year among the elite. The club underwent an ambitious change of image via a marketing campaign, changing its symbol to the greyhound and the green colors to bordeaux. Managers seemed to only be fortunate in Campo Maior at the end of the season, and João Alves faith was no different from its predecessors. José Pereira had the honor to lead the team to the Taça de Portugal final in 1999, against Beira-Mar. Campomaiorense had benefited from all three major clubs' eliminations: Porto's shock defeat at third division side Torreense, Sporting CP's loss to Gil Vicente, and Benfica's to Vitória de Setúbal. In the final, people from all over Alentejo descended on Estádio Nacional in Jamor, where a free banquet was offered by millionaire Rui Manuel Nabeiro, father of Campomaiorense chairman João Manuel Nabeiro, whose coffee packaging company Delta Cafés was the club’s main sponsor. However, a late dramatic goal by Porto's on-loan midfielder Ricardo Sousa ended the dream for Campomaiorense. The club managed to remain in the top division for two more seasons, but following relegation in 2001 and inability to return the following year led to the decision to abandon professional football. The situation of having more available seats in the stadium than inhabitants in the village was one of the reasons for the club to be considered unworthy of the effort by its sponsors. The club dedicated the next four years to competing only in the youth championships while looking for new talent. In 2006–07, the club was revived and began competing at the regional level. In the 2011–12, Campomaiorense finally won promotion from the district leagues to the Portuguese Third Division, but renounced their participation in the national league.
