alberto cortina de alcocer (born january 20, 1947, in madrid, spain) is a spanish businessman. through his holding percacer, he is co-owner, with his cousin alberto alcocer, of alcor holding, the owner of 12.5% of grupo acs, the biggest construction company in the world by sales with 2014 revenues of usd 50b, and of 21% of ence, the largest paper pulp and biomass energy company in europe. he has appeared several years in forbes list of billionaires with usd 1.4 billion.