[2] Pinatubo's dam Lava Flow won two races, including the Listed Prix de la Seine at Longchamp Racecourse in 2013.

[6] Pinatubo was made 1/3 favourite and won by 9 lengths from Armory (Futurity Stakes), with the Racing Post referring to him as a "Ferrari of a racehorse" and trainer Appleby stating: "He's the best two-year-old I've ever trained".

[6] Following this victory, form analysts Timeform rated him the second-best two-year-old of the modern era behind Celtic Swing[7] On 12 October, Pinatubo ended his season in the Dewhurst Stakes at Newmarket and started the 1/3 favourite.

[9] The flat racing season in England was disrupted by the COVID-19 Pandemic and the 2000 Guineas was run a month later than usual on 6 June over the Rowley mile at Newmarket.

[12] Pinatubo returned to France for the Prix du Moulin over 1600 metres at Longchamp Racecourse on 12 September, in which he was matched against older horses for the first time.

[14] As well as standing at Dalham Hall Stud, Pinatubo shuttled to Australia with Godolphins' new stallions Bivouac, Ghaiyyath and Earthlight for the 2021 breeding season.