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 20th April 1775
Newmarket Challenge Whip over the Beacon Course 10st each
1. SWEET WILLIAM, bay horse owned by Lord Grosvenor
2. TRANSIT, chestnut horse owned by Lord Abingdon

Wednesday 10th May 1775
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. HEPHESTION (10/1), brown colt owned by Duke of Ancaster
2. GLIMPSE (6/1), chestnut colt owned by Lord Grosvenor
3. BON VIVANT, bay colt owned by Mr Strode
4. DARIUS, brown colt owned by Mr Burlton
5. MADCAP, bay filly owned by Lord Bolingbroke
6. FAIRSTAR (7/4 fav), chestnut colt owned by Sir Charles Bunbury
7. STARING TOM, brown colt owned by Sir John Shelley
8. SNAP filly, black owned by Sir John Moore
9. AID-DE-CAMP (6/1), bay colt owned by Mr Codrington
10. MAYFLY (4/1), bay filly owned by Mr Brand

Thursday 11th May 1775
Second Subscription Purse of 100 Guineas, over the Beacon Course, for horses the property of Jockey Club Members, each horse to carry 9st
1. MAMBRINO (7/4) bay horse owned by Lord Grosvenor
2. TRENTHAM (evens fav) brown horse owned by Sir Charles Sedley
3. SANDBECK, bay horse owned by Lord Rockingham
4. ATALANTA (5/1), chestnut mare owned by Mr Vernon
5. TRANSIT (5/1), chestnut horse owned by Lord Abingdon
6. PAPIST, grey horse owned by Mr Shirley
The first two had a run-off after dead heating first time around.

Tuesday 3rd October 1775
JOCKEY CLUB NEWMARKET CHALLENGE CUP
A Sweepstake of 200 Guineas each, Play or Pay, run over the Beacon Course with weights as prescribed at the Jockey Club Meeting on 5th October 1768
1. SWEETBRIAR, 6-y-o owned by Lord Grosvenor walked over