- Claiborne Farm, established by A.B. Hancock Sr. in the early 1910, is located on 2,700 acres. Hancock Sr. ran the farm until 1947, before it was passed on to A.B. “Bull” Hancock Jr.. In 1972, Bull handed over the reins to Seth, who has been at the helm ever since.
- Hancock is a former board member for Churchill Downs, Inc. and Keeneland Association. He is a member of the American Horse Council, The Jockey Club, Thoroughbred Breeders of Kentucky, Thoroughbred Owners & Breeders Association and a founding member of Breeders’ Cup Ltd.
- Claiborne, in partnership with Adele Dilschneider, bred and campaigned Blame, who stopped Zenyatta’s 19-race unbeaten streak with a victory in the 2010 Breeders’ Cup Classic by a head. Blame also scored Grade 1 victories in 2010 in the Stephen Foster, Whitney Handicap and the Jockey Club Gold Cup.
- Claiborne bred and raced 1984 Florida Derby (G1) winner Swale, who captured the Kentucky Derby and Belmont Stakes that year.
- The legendary farm also bred and campaigned Lure, who captured back-to-back editions of the Breeders’ Cup Mile in 1992-93.
- Claiborne was the leading North American breeder in money won in 1958-59, 1968-69 and 1984.
- Claiborne campaigned champions Forty Niner, Moccasin and 1984 Kentucky Derby and Belmont Stakes winner Swale.
- Claiborne bred champions Bayou, Beaugay, Doubledogdare, Gamely, Jacula, Lamb Chop, Nadir, Revidere, Round Table, Slew o’ Gold and Wajima.