He took a year out of his studies to train for and compete at the 2012 Summer Olympics, winning a bronze medal in the men's eight. Louloudis then returned to his Oxford studies, rowing in the winning eights of a second and third Boat Race in 2013 and 2014, before returning to the British eight, which he stroked to a gold medal at the 2014 World Rowing Championships. The next year he won a final Boat Race as president of Oxford University Boat Club. He was part of the British team that topped the medal table at the 2015 World Rowing Championships at Lac d'Aiguebelette in France, where he won a gold medal as part of the eight with Matt Gotrel, Pete Reed, Paul Bennett, Moe Sbihi, Alex Gregory, George Nash, Will Satch and Phelan Hill.