He excels over distances of around 2000 metres (ten furlongs) and is noted for his toughness, consistency and aptitude for racing on soft ground.
As a yearling in October 2015 he was consigned to the Tattersalls sale and was bought for £200,000 by Hamdan Al Maktoum's Shadwell Estate Company.
He went on to become a very successful breeding stallion, getting the winners of more than a thousand races across a range of distances including Sariska, Somnus, Farhh, Kyllachy and Immortal Verse.
[8] Addeybb began his second campaign in the Lincoln Handicap at Doncaster Racecourse on 24 March when he was ridden by James Doyle and went off at odds of 5/1 in a twenty-runner field.
Carrying 128 pounds he was among the leaders from the start, went to the front approaching the final furlong and drew away to win by two and three quarter lengths from the favourite Lord Glitters.
[10] The gelding was then moved up in class and started favourite for the Group 2 Sandown Mile on 27 April and won again in "impressive" fashion, taking the lead a furlong out and coming home almost three lengths clear of Stormy Antarctic.
"[12] He was then stepped up to the highest class for the Group 1 Lockinge Stakes at Newbury three weeks later but made no impact and finished eighth behind the filly Rhododendron.
He appeared to be going well before fading badly in the closing stages and coming home twelfth behind Roaring Lion, beaten more than twenty lengths by the winner.
[13] For his final run of the season the gelding was dropped in class to contest the Listed Churchill Stakes on the synthetic Polytrack surface at Lingfield Park and finished third behind the seven-year-old Master of the World.
"[17] Addeybb ended his season in the Champion Stakes at Ascot on 19 October, when he kept on well in the straight, to take second place, beaten three quarters of a length by Magical.
In the early part of the year the gelding was sent to race in Australia and made his antipodean debut in the Grade 1 Ranvet Stakes over 2000 metres at Rosehill Racecourse on 21 March when he went off the 2.4/1 third choice behind Verry Elleegant and Avilius.
He took the lead soon after the start and rallied after being overtaken by Verry Elleegant in the straight to regain the advantage and win by half a length.
He started at odds of 7/2 and briefly took the lead approaching the final furlong before being overtaken and beaten into second place by the four-year-old Lord North.
After a three-month break the gelding was dropped back in class for the Listed Doonside Cup at Ayr Racecourse in September and won by three quarters of a length from Lord Glitters, to whom he was conceding seven pounds in weight.
[27] On 27 March 2021, Addeybb resumed racing in Australia where he attempted to win consecutive Ranvet Stakes at Rosehill Racecourse as the 10/9 favourite.