The Jockey Club Plate, not to be confused with the Newmarket Town Plate which was first run on the Round Course in 1666, was restricted to Jockey Club Members and run at Newmarket annually. The earliest record of a Jockey Club Plate was in 1753 when two were staged two days apart. The first, for 4-year-olds, was run on the Round Course on Tuesday 15th May 1753 and won by Beau Clincher owned by Lord Gower, while 2 days later a second subscription Plate for 100 Guineas was contested on Thursday 17th May 1753 and was won by Crab owned by Captain Vernon. In 1764 the Jockey Club introduced the Newmarket Challenge Whip restricted to Jockey Club Members, a race run over the Beacon Course with each horse carrying 10 stone. The prize was a Whip, which contains hairs from the tail of the famous racehorse Eclipse, given to the Jockey Club by King Charles II. In 1768 the inaugural running of the Jockey Club Newmarket Challenge Cup , designed by Abraham Portal, took place over the Beacon Course and was restricted to Jockey Club Members. The 4 races provide vital evidence confirming membership of the Jockey Club.

Thursday 15th May 1783
Newmarket Challenge Whip over the Beacon Course 10st each
1. POTOOOOOOOO (1/4 fav), chestnut horse owned by Lord Grosvenor
2. NOTTINGHAM, brown horse owned by Sir John Lade

Wednesday 14th May 1783
Subscription Purse of 100 Guineas over 4 miles of the Round Course for 4-year-olds the property of Jockey Club Members, each horse to carry 8st
1. OLIVER CROMWELL (7/1), brown colt owned by Lord Derby
2. ASCOT (5/1), chestnut colt owned by Mr Parker
3. FANDANGO, bay colt owned by Lord Clermont
4. ADMIRAL (5/2), bay colt owned by Mr Vernon
5. SLENDER, bay colt owned by Duke of Queensberry
6. SWEET ROBIN (3/1), bay colt owned by Lord Grosvenor
7. FROTH, grey colt owned by Lord Ossory
8. PANDOUR, bay colt owned by Mr Burlton

Thursday 15th May 1783
Second Subscription Purse of 100 Guineas, over the Beacon Course, for horses the property of Jockey Club Members, each horse to carry 8st 7lbs
1. GUILDFORD (1/7 fav), bay horse owned by Lord Derby
2. DICTATOR, chestnut horse owned by Lord Clermont

Thursday 16th October 1783
Newmarket Challenge Whip over the Beacon Course 10st each
1. ANVIL (8/11 fav), bay horse owned by Mr Parker
2. GUILDFORD (7/4), bay horse owned by Lord Foley
3. BOUDROW (8/1), bay horse owned by Mr O'Kelly

JOCKEY CLUB NEWMARKET CHALLENGE CUP was not contested in 1783