He was owned by Michael Buckley, trained by Nicky Henderson, and was ridden by Barry Geraghty in all but one of his races.

[5] In his first start under rules, Finian's Rainbow won a two-mile National Hunt flat race at Kempton Park, beating Stoney's Treasure by six lengths.

[7] On his next start he finished third, one length behind winner Reve De Sivola, in the Grade 1 Challow Novices' Hurdle.

[9] Finian's Rainbow started the 2010–11 season in November 2010, when he won a Class 3 Novices' Chase at Newbury over two miles and one furlong, easily beating Hell's Bay by twelve lengths.

He won the race by eleven lengths from Stagecoach Pearl, after being eased up in the final stages by jockey Andrew Tinkler.

[11] At Aintree on 9 April, Finian's Rainbow was one of seven horses to run in the Maghull Novices' Chase over two miles.

Finian's Rainbow was nearly four lengths ahead of leading novice Al Ferof, who finished in third place.

[14] In the Queen Mother Champion Chase at the Cheltenham Festival, he faced a quality field that included the previous two winners Sizing Europe and Big Zeb.

[16] Sizing Europe and Finian's Rainbow began to pull clear with two fences left to jump.

He then pulled clear to win by seven lengths from Wishfull Thinking, with Albertas Run finishing in third place.

[19] Trainer Nicky Henderson said after the race: "Today he was always in a comfortable position just behind and you hoped he was in cruise control and he probably was.

He was the fourth highest rated chaser overall, behind Kauto Star, Long Run and Master Minded.

[21] Finian's Rainbow made a disappointing start to the 2012–13 National Hunt season, when, in heavy ground, he finished last of the four runners and 24 lengths behind winner Captain Chris in the Amlin 1965 Chase.