Portugal
SL Benfica, FC Porto, and Sporting CP are the largest sports clubs by popularity and by number of trophies won, often known as "os tres grandes" ("the big three"). They have won eight titles in the European UEFA club competitions, were present in many finals and have been regular contenders in the last stages almost every season. Other than football, many Portuguese sports clubs, including the "big three", compete in several other sports events with a varying level of success and popularity, these may include roller hockey, basketball, futsal, handball, and volleyball. The Portuguese Football Federation (FPF)  - Federacao Portuguesa de Futebol - annually hosts the Algarve Cup, a prestigious women`s football tournament that has been celebrated in the Algarvian part of Portugal.
How many titles in the European UEFA club competitions have "the big three" won?
eight
They have won eight titles in the European UEFA club competitions, were present in many finals and have been regular contenders in the last stages almost every season.
the European UEFA club competitions