SITWA f. 1996
BOOMING (FR) - FITWA (BRZ), by BAHR EL GHAZAL (BRZ)

SIX AVRIL (FR) c. 1935
TOWN GUARD (GB) - TUTRIX (IRE), by RIGH MOR (GB)

SIX CROWNS (USA) f. 1976
SECRETARIAT (USA) - CHRIS EVERT (USA), by SWOONS SON (USA)

SKI CHAMP (USA) c. 1986
ICECAPADE (USA) - SKI GOGGLE (USA), by ROYAL SKI (USA)

SKI GOGGLE (USA) f. 1980
ROYAL SKI (USA) - MISSISSIPI SIREN (USA), by DELTA JUDGE (USA)

SKY HIGH (GB) c. 1943
HYPERION (GB) - PYRAMID (---), by

SKYGLORY () f. 0000
- , by

SKYLE f. 1969
AUREOLE (GB) - SKYLINE (GB), by

SKYLINE (GB) f. 1962
- , by

SKYWALKER (USA) c. 1982
RELAUNCH (USA) - BOLD CAPTIVE (USA), by BOLDNESIAN (USA)