Encke began his racing career at the 2011 St Leger meeting at Doncaster where he finished second by half a length to Perennial in a one milemaiden race. On 1 October Encke started 8/13 favourite for a similar race at Newmarket. Ridden by Richard Hughes, he took the lead a furlong from the finish and pulled clear to win easily by four and a half lengths. The colt's owners then paid a supplementary entry fee to run Encke in the Racing Post Trophy, but he was forced to miss the race through injury.
2012: three-year-old season
On his three-year-old debut, Encke carried 126 pounds in a handicap race over ten furlongs at Sandown Park in July. Ridden for the first time by Mickael Barzalona he took the lead two furlongs from the finish and held on to win by half a length and a neck from Ginger Jack and Tropical Beat. Later in the month, Encke was moved up in class for the Group ThreeGordon Stakes at Goodwood Racecourse. The race developed into a protracted struggle between Encke and Noble Mission, who raced together throughout the final furlong before the latter won by a nose. A month later, Encke ran in the Great Voltigeur Stakes at York and finished third to Thought Worthy. According to Zarooni there were excuses for both defeats: he said that Encke had been unsuited by the course at Goodwood and the slow pace at York. At Doncaster on 15 September Encke started a 25/1 outsider in a nine runner field for the St Leger. The Irish colt Camelot started the 2/5 favourite to become the first British Triple Crown winner since Nijinsky after winning the 2000 Guineas and Epsom Derby. Barzalona restrained Encke in the early stages before moving up to dispute the lead in the straight. As Camelot's rider Joseph O'Brien was trying to obtain space for a clear run, Barzalona sent the Encke into a clear lead approaching the final furlong and he held the challenge of Camelot to win by three quarters of a length. After the race Zarooni, who was winning his second classic following the victory of Blue Bunting in the 2011 1000 Guineas admitted that he had not wanted to run the colt in the race, but had been persuaded to do so by Sheikh Mohammed.
2013: four-year-old season
In May 2013 Encke was one of twenty-two of Al-Zarooni's horses to test positive for anabolic steroids in an out of competition test conducted by the British Horseracing Authority. The horse was banned from racing for six months. The colt had previously passed drug tests before and after the St Leger and a BHA spokesman said that "we can be certain he was not under the benefits of substances" at the time of his classic victory. Charlie Appleby took over the training of most of the Zarooni-trained horses, including Encke.
2014: five-year-old season
Encke eventually returned to the racecourse on 1 August 2014, when he started the 6/1 third favourite for the Group Three Glorious Stakes at Goodwood. Ridden by William Buick, he took the lead in the straight but was overtaken and beaten one and a quarter lengths into second place by the favourite Pether's Moon. In September he was sent to Ireland for the Irish St Leger and finished third behind Brown Panther and Leading Light. On 4 October, Encke was again matched against Pether's Moon in the Cumberland Lodge Stakes at Ascot Racecourse. He led for most of the way but was overtaken in the straight and beaten into third place behind Pether's Moon and the Irish-trained Parish Hall. On the morning of14 October, Encke was engaged in a routine training gallop when he sustained a serious injury to a hind leg. Complications ensued and the horse was euthanised on the same day. Appleby said that "Encke was a talented racehorse and will be sorely missed as he was one of the yard's favourites".
