[4] City of Light was sold at the 2015 Keeneland Yearling Sales for $710,000 to William and Suzanne Warren, who had earlier owned Horse of the Year Saint Liam.

[5] City of Light made his first start on July 7, 2017, in a maiden special weight race at Los Alamitos Racecourse, finishing second.

[2] Despite having only one win from four starts, McCarthy decided to step City of Light up in class for the Grade I Malibu Stakes, held on December 26 at Santa Anita.

[2][9] On March 10, 2018, City of Light made his first start as a four-year-old in the Triple Bend Stakes, a seven furlong sprint at Santa Anita.

[12] Breaking from the outside post in a field of eleven, City of Light settled into fourth place behind the early pace set by Untrapped, just a few lengths behind Accelerate.

At the time I was nervous, because you worry if they are going to show up after the running starts, but when they got to the quarter pole and Drayden hadn't moved his hands, I had the utmost confidence in my horse.

[15] McCarthy then chose to cut back in distance by entering City of Light in the Forego Stakes at Saratoga on August 25.

Breaking poorly from the outside post position, City of Light settled in mid pack while being carried extremely wide around the turn.

"[17] City of Light then trained up to the Breeders' Cup Dirt Mile held on November 3 at Churchill Downs.

[18] Having drawn post position one, City of Light was urged to the early lead in order to avoid getting trapped on the rail.

"[19] City of Light made his final start on January 26, 2019, in the Pegasus World Cup at Gulfstream Park.

With the Pegasus World Cup set at the intermediate distance of 1+1⁄8 miles, the two were thought to be closely matched, with Accelerate going off as the slight favorite.

However, Accelerate could not match the pace and City of Light continued to draw away, winning by 5+3⁄4 lengths over the late-closing Seeking the Soul.

"[21] After the Pegasus World Cup, City of Light was retired to stud at Lane's End Farm, where he joins Accelerate and his sire Quality Road.