1803: Three-year-old season

Parasol made her first appearance on the track at Epsom Downs in the Oaks Stakes on 27 May, when she started as the 2/1 favourite. The race was won by Theophania, with a sister to Allegranti in second and Parasol in third place.^[3] At Newmarket's July meeting she won the Town Plate from Rumbo and two others.^[4] In October she was due to face three horses in a 100 guineas Sweepstakes at Newmarket, but all three paid a forfeit and the race never took place. The next day she won a race for One-third of a Subscription of 25 guineas each, beating four rivals.^[5] At the Second October meeting she beat the colt Orlando to win a £50 Subscription Plate.^[6] At the Third October meeting Parasol was due to face the filly Elizabeth in a match race, but Elizabeth was withdrawn.^[7]

1804: Four-year-old season

Her first race of the 1804 season was the Second Class of the Oatlands Stakes at Newmarket. After starting the race favourite, she won from Hard-bargain in second, Lignum Vitae in third, and three others.^[8] Later in the month she was due to race 1802 Derby runner-up Young Eclipse, but Young Eclipse's owner paid a forfeit and the race never took place.^[9] At the same meeting she was due to race Eagle, but was withdrawn.^[10] In early May at Newmarket she received another forfeit, this time from the horse Malta, before beating Enchanter in a match race over one mile.^[11] Parasol didn't run again until Newmarket's First October meeting, when, starting as the odds-on favourite, she beat three rivals to win One third of a Subscription of 25 guineas each.^[12] Two days later she beat Sir Harry Dimsdale and Walton to win the King's Plate, run over almost four miles. She also collected a forfeit from Baron Foley's Watery, from a race that was due to be run later in the day.^[13] At the Second October meeting Parasol beat Buss in a two-mile match race.^[14] Later in the week she was entered in the Second Class of the October Oatlands Stakes, but never lined up.^[15] In her final race of the year she was beaten by Lennox over four miles.^[16]

1805: Five-year-old season

Like in 1804, Parasol started the 1805 season in the Second Class of the Oatlands Stakes. She started the race as the favourite, but could only finish third, behind winner Giles and runner-up Duxbury.^[17] On 30 April at the Newmarket First Spring meeting she finished last of the three runners, behind winner Walton, in a £50 Subscription race over one mile.^[18] Later in the day she walked over for the King's Plate for five-year-old mares.^[19] On 1 May she won a £50 Subscription, where Hippocampus finished second and Houghton Lass third.^[20] At the Second Spring meeting she faced Walton and Petruchio in the Jockey-Club Plate.

Walton started the race as the 4/6 favourite, with Parasol second in the betting at 7/4. Parasol won the race from Walton, with Petruchio finishing last.^[21] After a few months off, Parasol returned to the track for the First October meeting. On the first day of the meeting she walked over for a Subscription of 5 guineas each, before collecting a forfeit from Pipylin.^[22] Two days later she walked over for a race work 50 guineas over the four-mile Beacon course.^[23] Another day later she walked over to win the King's Plate for the second year running.^[24] At the Second October meeting she beat Sir Harry Dimsdale to win a race for One-third Subscription of 25 guineas each over the Beacon course.^[25] This turned out to be her last race of the season, as she was withdrawn from the October Oatlands Stakes.^[26]

1806: Six-year-old season

In the spring of 1806 Parasol received a forfeit from Hippocampus,^[27] and then received forfeits from the two other subscribers in a Sweepstakes of 200 guineas each at Newmarket.^[28] She made her reappearance on 22 April at Newmarket, where she beat Margery and Gloriana to win the King's Plate for mares. In the following race she beat Antipater in a £50 Subscription.^[29] In May she started as the odds-on favourite for the Jockey Club Plate at Newmarket, but could only finish third of the five runners. The race was won by Staveley.^[30] At Newmarket's July meeting she lost a match to Jerboa, before beating Sir Charles Bunbury's filly Lydia in a race worth £50 the next day.^[31]

As in previous years Parasol didn't run again until the Newmarket First October meeting, where she started at 3/1 in a 50 guineas race over four miles. The race was won by Orville, with Parasol second and Staveley third.^[32] The following day she received a 50 guineas forfeit Czar Peter.^[33] At the Second October meeting she beat Derby winner Cardinal Beaufort in a 200 guineas match race over the Beacon course.^[34] She was entered in the first class of the October Oatlands Stakes, which was run on the same day, but she was withdrawn. Selim won the race.^[35] At the Houghton meeting Parasol lost a match against Slipper^[36] and three days later she ran unplaced behind winner Pelisse in a Subscription Handicap Plate.^[37]

1807: Seven-year-old season

Parasol started as the 2/1 favourite for the first class of the Oatlands Stakes on 30 March 1807. She finished the race in third place behind Hippomenes and Houghton Lass. There were four other runners in the race, including Orville and Quiz.^[38] This was her only run until the First October meeting, where she was beaten by Brainworm.^[39] The days later she was made favourite for the King's Plate. The race was won by Canopus, with Parasol second and Thumper finishing last of the three runners.^[40] At the second October meeting Parasol lost to Orville in a four-mile race for one third of a Subscription of 25 guineas each.^[41]

1808: Eight-year-old season

In her first start as an eight-year-old, Parasol finished runner-up to Violante in the second class of the Oatlands Stakes.^[42] At the First Spring meeting she lost a match to Bacchanal,^[43] before beating Taurus over the Beacon course to win 100 guineas.^[44] This turned out to be her final race as her intended opponent, Thorn, was withdrawn from their match race to be run at the Second Spring meeting.^[45]