Three weeks later he started odds on favourite for a maiden at Galway Racecourse when he was ridden by his trainer's son Donnacha and recorded his first success as he led for most of the way and won "comfortably" by one and a half lengths from the filly Lightning Amber.
[7] The colt was steadily moved up in class in his three remaining races of 2018, starting with a trip to England for the Group 3 Acomb Stakes over seven furlongs at York Racecourse on 22 August when he came home sixth of the eight runners behind Phoenix of Spain.
[9] On 6 April Broome began his second campaign in the Group 3 Ballysax Stakes over ten furlongs on soft ground at Leopardstown when he was ridden by Ryan Moore and started 5/2 second favourite behind the Dermot Weld-trained Tankerville.
After an absence of more than eleven months Broome returned in a strongly contested edition of the Coronation Cup over one and a half miles at Newmarket Racecourse on 5 June (the race is usually run at Epsom but was relocated owing to the COVID-19 pandemic).
Ridden by James Doyle he started slowly and never looked likely to win, coming home fourth behind Ghaiyyath, Anthony Van Dyck and Stradivarius.
[17] Broome began his fourth campaign in the Listed Devoy Stakes over ten furlongs on soft ground at Naas Racecourse on 28 March when he was ridden by Seamie Heffernan and started the 7/2 second favourite behind Up Helly Aa.
After his customary slow start Broome overtook the front-running Sunchart approaching the last quarter mile and won "easily" by three and a half lengths to record his first success in more than 22 months.
"[19] Three weeks later, with Moore in the saddle, Broome started 2/5 favourite for the Group 3 Alleged Stakes over ten furlongs at the Curragh and won again, producing a strong late run to beat the filly Thundering Nights by half a length with Up Helly Aa in third and Helvic Dream in fourth.
"[21] On 3 May over the same course and distance, Broome contested the Group 2 Mooresbridge Stakes and started 4/9 favourite against five opponents including Up Helly Aa, Helvic Dream and Twilight Payment.
"[23] Three weeks later at the same track, Broome returned to Group 1 class for the first for the Tattersalls Gold Cup over ten and a half furlongs on soft to heavy ground at the Curragh and started 10/11 favourite in an eight-runner field.
He tracked the leaders before making steady progress in the straight but was unable to catch the four-year-old filly Wonderful Tonight and finished second, beaten one and a half lengths by the winner.
"[27] In the King George VI and Queen Elizabeth Stakes on firm ground at Ascot on 24 July Broome led for most of the way but was overtaken in the straight and faded to come home fourth of the five runners behind Adayar, Mishriff and Love.