| YOB | Country of Origin | Horse | Previous name | Sire | Dam | Sire of Dam | Colour | Sex | Breeder |
| 2003 | ENG | A NEW ERA | TODAYS MAN (USA) | STONERIGGS SPEED | SOLITUDE | BAY | FEMALE | JOHN LINSLEY | |
| 2003 | GB | ALCHEMY | STONERIGGS J R | SO RHIWD | SUNBEAM (USA) | DK BAY | MALE | ROBERT MILLICHAP | |
| 2003 | GB | ALMEDIDA STAR | MACATROSS (USA) | ANNABELLES | CITY LIGHTS | BAY | FEMALE | W D JENKINS | |
| 2003 | GB | AMERICAN D J | EYE ON AMERICA (USA) | D J DONNELLY | YANKEE BE GONE | BAY | FEMALE | GAIRNS A S | |
| 2003 | SCO | AMERICAN DJ | EYE ON AMERICA (USA) | D J DONNELLY | YANKEE BEGONE | BAY | FEMALE | A GAIRNS | |
| 2003 | ENG | AMY'S LAD | DESTINY SON | PROUD AMY | TRUBA RAINBOW | CHESTNUT | MALE | J A TILL | |
| 2003 | ENG | ANNIE | COALFORD LAAG | NORA BATTY | KENTUCKY LOBELL | GREY ROAN | FEMALE | W POWERS | |
| 2003 | ENG | ANOTHER MAN | FRANKIES BEST MAN | TODAYS MAN (USA) | STONERIGGS GLANCE | RAJAH LOBELL (USA) | BAY | MALE | F G MARSHALL |
| 2003 | ENG | ANOTHER TOTO | SPLURGE HANOVER (USA) | SCOOTS KIWI | MASTER SCOOT (USA) | BAY | MALE | JOYCE MORLIDGE | |
| 2003 | ENG | APACHE QUEEN | APACHE NEGRA | MOOD AND FUN (HOL) | MINNESOTA VIKING | BLACK | FEMALE | JESSE HARRIS | |
| 2003 | IRL | ARMBRO FACTOR | ARMBRO HARRIER (USA) | CAROLINE FACTOR | CONTROL FACTOR | BAY | MALE | S.BUCKLEY.BANTRY.CO CORK | |
| 2003 | ENG | ARTICULATOR | COALFORD ART | MORTON OAKS | SOLITUDE | BAY | MALE | JOAN SYKES | |
| 2003 | ENG | ARTISAN | SOUTHWEST ART (USA) | COALFORD SATURN | SURFER HANOVER | BROWN | MALE | A SWINBANK | |
| 2003 | ENG | ATTRACTION | NITO (USA) | SET SAIL | MATTS SCOOTER | DK BAY | FEMALE | LYDIA HARBOUR | |
| 2003 | SCO | AWESOME | TOMMY M LOBELL | PROUD PACER | PACEFAST PICK | DK BAY | FEMALE | G SPENCE | |
| 2003 | GB | AYR ATTACK | HOUSE OF CARDS (USA) | LADY LAMOUR | ARMBRO MYSTIC | LB | MALE | O' NEIL HUGH | |
| 2003 | GB | AYR CANDY | HOUSE OF CARDS (USA) | EYE ON AYR | EYE ON AMERICA | BAY | FEMALE | O' NEIL HUGH | |
| 2003 | GB | AYR DESIRE | BROWNING BLUE CHIP | ANOTHER HALO (USA) | NIATROSS | DK BAY | FEMALE | O' NEIL HUGH | |
| 2003 | GB | AYR DOT COM | HOUSE OF CARDS (USA) | GHOSTLY RETURNS (CAN) | LAAGUSA) | LB | MALE | O' NEIL HUGH | |
| 2003 | GB | AYR GLORY | MATTS SCOOTER (USA) | JAZZERCISE (USA) | ABERCROMBIE (USA) | BAY | MALE | O' NEIL HUGH | |
| 2003 | GB | AYR GOLD | EYE ON AMERICA (USA) | TAKE WING (USA) | ALBATROSS (USA) | BAY | FEMALE | O' NEIL HUGH | |
| 2003 | GB | AYR LEE | MACS DIAMOND | HOUSE OF CARDS (USA) | TAURUS LEE | TAURUS HANOVER (USA) | BAY | FEMALE | O' NEIL HUGH |
| 2003 | GB | AYR QUALITY | HOUSE OF CARDS (USA) | IDEAL QUALITY | KEYSTONE BARON (USA) | LB | FEMALE | O' NEIL HUGH | |
| 2003 | GB | AYR RAIDER | HOUSE OF CARDS (USA) | ROUND THREE (USA) | SEAHAWK HANOVER | BAY | MALE | O' NEIL HUGH | |
| 2003 | GB | AYR ROYAL | MAGICAL MIKE (USA) | RACKEM AGAIN (CAN) | TYLER B | BAY | FEMALE | O' NEIL HUGH | |
| 2003 | ENG | B N GOODNIGHT | BRETS NIGHT N GALE (USA) | BANTAM B N | B N ANDY | DK BAY | FEMALE | S MORGAN | |
| 2003 | WAL | BABY CAM | SURE CAM (USA) | CEIRON SHES AWAY | STONERIGGS J R | BAY | FEMALE | T KNOTT | |
| 2003 | ENG | BABYLON | MYSTIC PRIDE (SWE) | GALAXIE DOR (SWE) | DITKA HANOVER | BLACK | MALE | DAVID J BOWEN | |
| 2003 | GB | BALANCE PRINCESS | BALANCED SPRING (CAN) | DALES PRINCESS | NOLAN HANOVER | BAY | FEMALE | J HOROBIN (JNR) | |
| 2003 | GB | BALANCE QUEEN | BALANCED SPRING (CAN) | KM | KASUKU | CHESTNUT | FEMALE | PETER MATHER | |
| 2003 | ENG | BARNLEY | HASTY HALL (USA) | BON HANNAH | SLY HEEL | BAY | GELDING | R D MORRIS | |
| 2003 | IRL | BAYLADY TRIUMPH | TIMON DEL SOL | STONERIGGS TRIUMPH | EYE ON AMERICA | BAY | FEMALE | B.BARRY | |
| 2003 | GB | BEACON BLACKMAGIC | HOPPING HIGH (USA) | OUR SECRET | ECOLOGIST (USA) | DK BAY | FEMALE | MAIR WILSON | |
| 2003 | GB | BEAUTY SPOT | STUD MUFFIN (USA) | COALFORD BEAUTY (USA) | LAAG (USA) | GR | FEMALE | G THOMAS | |
| 2003 | IRL | BEECHCOURT | ARMBRO HARRIER (USA) | BEECH LODGE | FLIGHT MESSENGER | BAY | MALE | S.COREY | |
| 2003 | GB | BELL MAGIC | HASTY HALL (USA) | LIZABETH | HANDSOME SUM (USA) | BAY | FEMALE | DREMSTONE STANDARDBREDS | |
| 2003 | GB | BELLE STORM | IDEAL KEY (SWE) | BELLADY (NZ) | BALLAM (NZ) | DK BAY | FEMALE | LORRAINE BATES | |
| 2003 | ENG | BETTY BLUE | BRETS CONTENDER (USA) | SALLY BLUE | ARMBRO WARD | DK BAY | FEMALE | J PETERS | |
| 2003 | ENG | BLACK COUNTRY JET | KIWI ELIT (SWE) | VALCHIRIA JET (ITA) | CROWNS INVITATION | DK BAY | FEMALE | B BUTLER | |
| 2003 | ENG | BLACK KNIGHT | SILKY STALLONE (CAN) | ALEX BRASS | SOLITUDE (USA) | BLACK | MALE | J A ALDERSON | |
| 2003 | WAL | BLACK SHADOW | STONERIGGS J R | SHADIE DAISY | KENTUCKY LOBELL | BLACK | FEMALE | R LUND | |
| 2003 | GB | BLACKFIELD CARISMA | MACATROSS (USA) | COALFORD CADILLAC | SURFER HANOVER | BAY | FEMALE | D THOMAS | |
| 2003 | GB | BLACKFIELD WHIZ | MACATROSS (USA) | PAMELA HILL | SUNBEAM (USA) | BAY | FEMALE | D THOMAS | |
| 2003 | GB | BLACKWELL MONSOON | HARDEN (USA) | BLACKWELL LOUISE | COVER UP | BAY | FEMALE | W.MOUNSEY | |
| 2003 | IRL | BLATANTLY PRIDE | BLATANTLY BALD (USA) | TARAS PRIDE | KEYSTONE BARON | BAY | MALE | C.BENNETT | |
| 2003 | ENG | BLOWING WIND | DESTINY SON | GLENFIELD MICKIE | PRICE LEE DANCER (USA) | BAY | FEMALE | J A TILL | |
| 2003 | ENG | BLUE BEACH | COALFORD LAAG | BLACKWELL APACHE | CHINOOK | GREY/WHITE | FEMALE | MR JOE BUCKLEY | |
| 2003 | IRL | BLUE CAMPARIE | CAMS SECURITY (USA) | IM IN CONTROL | CONTROL FACTOR | BAY | FEMALE | T.FORBES | |
| 2003 | ENG | BLUE DANUBE | NAT KING COLE | BLUE LACE | BURST OF ENERGY (USA) | BAY | FEMALE | MR R HOWARD | |
| 2003 | ENG | BLYTHE VIEW TOM | IMMORTALIZED (USA) | KANDY | SHERMAN ALMAHURST | BAY | GELDING | CRAIG NUTTALL | |
| 2003 | GB | BOGIES BABY | RAQUE BOGART (USA) | THE BABY SITTER | ARMBRO HARRIER | BAY | FEMALE | JEWITT ANGELA | |
| 2003 | GB | BON JASPER | HASTY HALL (USA) | BON SIAN | MASTER SCOOT | BROWN | MALE | R D MORRIS | |
| 2003 | GB | BON ROBERT | HASTY HALL (USA) | BON AMI | RUSTLE OF SPRING | BAY | MALE | MORRIS R D | |
| 2003 | ENG | BOOGIE DALE | TODAYS MAN (USA) | DANCE ON DALE | CREATIVITY | CHESTNUT | MALE | W T SOWERBY | |
| 2003 | WAL | BORDER ELITE | BORDER PATROL | SAUNDERS BREN | TAURAS HANOVER (USA) | BAY | FEMALE | BORDER STUD | |
| 2003 | ENG | BRAVE CHIEF | TODAYS MAN (USA) | CLEARMARK (NZ) | NESTER HANOVER (USA) | BAY | MALE | J WINTER | |
| 2003 | WAL | BRETS MELODY | BRETS CONTENDER (USA) | SAUNDERS SUE | TAURUS HANOVER (USA) | BAY | FEMALE | ARTHUR BRYN GETHIN | |
| 2003 | WAL | BRETS TERMINATOR | BRETS CONTENDER (USA) | SAUNDERS VIRGO | KEYSTONE BARON (USA) | DK BAY | MALE | ARTHUR BRYN GETHIN | |
| 2003 | WAL | BRYWINS A-ONE | WHITE HEAT (USA) | GRADE A ONE (USA) | LAAG | GREY | FEMALE | BRYWINS STANDARDBREDS | |
| 2003 | WAL | BRYWINS BEAMA | WHITE HEAT (USA) | PLAYFUL BUNNY (CAN) | PRECIOUS BUNNY (USA) | GREY | MALE | BRYWINS STANDARDBREDS | |
| 2003 | WAL | BRYWINS BEAUTICIAN | WHITE HEAT (USA) | MIKES STARLIGHT (USA) | CAMTASTIC | DK BAY | FEMALE | BRYWINS STANDARDBREDS | |
| 2003 | WAL | BRYWINS BLAZE | WHITE HEAT (USA) | BONNIES CHANCE | ARMBRO WARD (CAN) | BAY ROAN | FEMALE | BRYWINS STANDARDBREDS | |
| 2003 | WAL | BRYWINS COWBOY | MAGICAL MIKE (USA) | ITS HIGH NOON (USA) | WESTERN HANOVER | BAY | MALE | BRYWINS STANDARDBREDS | |
| 2003 | ENG | BRYWINS HEATWAVE | WHITE HEAT (USA) | SPRINT AHEAD (CAN) | CAMS CARD SHARK (USA) | GREY | FEMALE | BRYWINS STANDARDBRED | |
| 2003 | WAL | BRYWINS MATRIX | WHITE HEAT (USA) | FAMILY MATTERS (USA) | ALBATROSS (USA) | GREY | MALE | BRYWINS STANDARDBREDS | |
| 2003 | GB | BRYWINS MAVERICK | WHITE HEAT (USA) | STONERIGGS MOHAWK | FLEET DECISION (USA) | DK BAY | MALE | BRYWINS STANDARDBREDS | |
| 2003 | GB | BRYWINS OVINA | WHITE HEAT (USA) | SAUNDERS VALENTINE | TAURUS HANOVER (USA) | BAY | FEMALE | BRYWIN'S STANDARDBREDS | |
| 2003 | WAL | BRYWINS PETER | WHITE HEAT (USA) | BRYWINS PRINCESS | SEVENTH HEAVEN | BAY | MALE | BRYWINS STANDARDBREDS | |
| 2003 | WAL | BRYWINS RED ROCK | ROUGH DIAMOND | WHITE HEAT (USA) | UNIVERSAL MISS (NZ) | ANDREL (NZ) | CHESTNUT | MALE | BRIAN DAVIES |
| 2003 | WAL | C U MAXI | HASTY HALL (USA) | C U JESSIE | CLEMENTCY | LT BAY | FEMALE | G MORGAN | |
| 2003 | WAL | C U SALZBURG | HOPPING HIGH (USA) | C U SOOTY | STONERIGGS JR | DK BAY | MALE | G MORGAN | |
| 2003 | WAL | CAENWOOD BEACH GIRL | JENNAS BEACH BOY (USA) | RIPLEY (USA) | ABERCROMBIE (USA) | DK BAY | FEMALE | J PRICE | |
| 2003 | WAL | CAENWOOD DIXIE II | NAT KING COLE | SAUNDERS SLIPAWAY | TAURUS HANOVER (USA) | DK BAY | FEMALE | J PRICE | |
| 2003 | WAL | CAENWOOD QUALITY | NAT KING COLE | QUALITY PLUS | KERRYGOLD (USA) | BAY | MALE | J PRICE | |
| 2003 | WAL | CAENWOOD STALLONE | SILKY STALLONE (CAN) | LENA FLETCHER | CLAUSTROPHOBIA (USA) | DK BAY | MALE | J PRICE | |
| 2003 | ENG | CALAMITY | HANDSOME SUM (USA) | DANCING MY WAY | BURST OF ENERGY (USA) | BAY | FEMALE | R FAWCETT | |
| 2003 | ENG | CALAMITY JANE | HOGANS HEROES (USA) | COUNTRY CHARISMA | ARMBRO WARD | BAY | FEMALE | J T GUNN | |
| 2003 | WAL | CAM CRYSTAL | SURE CAM (USA) | SAUNDERS ARETHA | KEYSTONE BARON (USA) | BAY | FEMALE | D H JONES | |
| 2003 | IRL | CAMS BEAUTY | CAMS SECURITY (USA) | INDICATOR (IRE) | RACING KNIGHT (USA) | BLACK | FEMALE | T.CRITCHLOW | |
| 2003 | ENG | CANADA DAY | HANDSOME SUM (USA) | STONERIGGS KERMIT | FLEET DECISION (USA) | BAY | FEMALE | MR W HOWARD | |
| 2003 | ENG | CAUSEWAY BLAZE | FLEET ADMIRAL | JESSIE M | ARMBRO HARRIER | BAY | MALE | T J SMITH | |
| 2003 | GB | CEIRON ALMA | IMMORTALIZED (USA) | ALMA SURPRISE | SAN SAN ALMAHURST (USA) | BAY | FEMALE | THOMAS J D MR | |
| 2003 | GB | CEIRON VALENTINO | STONERIGGS J R | NANS CHOICE | TAURUS HANOVER (USA) | BAY | MALE | THOMAS J D MR | |
| 2003 | GB | CEIRON ZARA | STONERIGGS J R | SAUNDERS ZIRCON | KEYSTONE BARON (USA) | DKB | FEMALE | THOMAS J D MR | |
| 2003 | WAL | CELTIC FALCON | WHITE HEAT (USA) | CELTIC WAVE | TRURO HANOVER | BAY | MALE | P T DAVIES | |
| 2003 | IRL | CELTIC HARRIER | ARMBRO HARRIER (USA) | CELTIC GIRL | BLACKWELL PETER | BAY | MALE | K HURLEY | |
| 2003 | WAL | CELTIC HAWK | WHITE HEAT (USA) | SAUNDERS ZIPPER | KEYSTONE BARON (USA) | BAY | MALE | P T DAVIES | |
| 2003 | IRL | CHANCE SECURITY | CAMS SECURITY (USA) | EVERY CHANCE | BAY | MALE | F.CRONIN | ||
| 2003 | ENG | CHANTELLE | NITO (USA) | ELIZABETH HILL | TURO HANOVER | BAY | FEMALE | LYDIA HARBOUR | |
| 2003 | GB | CHAPS COMMANDER | NITRO | CHAPS (USA) | LADY COMMANDER (USA) | NO NUKES (USA) | BAY | MALE | S YOUNG |
| 2003 | GB | CHEROKEE SPRING | MUSIC KING (USA) | PENDLE GYPSY | RAINMAKER | BAY | FEMALE | HOBSON ARTHUR MR | |
| 2003 | IRL | CHESNEY | GRAND PRIX (USA) | DANCE ON BYE | GO ON BYE | BAY | MALE | HIGH HOPE STABLES | |
| 2003 | IRL | CITY SHOCK | RORSCHACH (AUS) | CITY GIRL | CITY LIGHTS | SKEWBALD | FEMALE | P.CRAWFORD | |
| 2003 | GB | CLOVER SCOT | PRINCE LEE DANCER (USA) | SOUTHLANDS KESTREL | FLEET DECISION | BAY | FEMALE | DREMSTONE STANDARDBREDS | |
| 2003 | GB | COALFORD MAJOR | COALFORD LAAG | SAUNDERS CHELSEA | KEYSTONE BARON (USA) | GR | MALE | COALFORD STUD | |
| 2003 | GB | COALFORD RHYTHM | COALFORD LAAG | COALFORD REALITY | MUSIC KING (USA) | GR | MALE | COALFORD STUD | |
| 2003 | GB | COALFORD VALOUR | COALFORD LAAG | COALFORD JENNA | SURFER HANOVER | BAY | MALE | COALFORD STUD | |
| 2003 | GB | COALFORD YANKEE | COALFORD LAAG | COALFORD TOWNER (USA) | BIG TOWNER | GR | MALE | COALFORD STUD | |
| 2003 | ENG | CONNERS DRAGON | DRAGON AGAIN (USA) | HURRY UP HEATHER (USA) | FALCON SEELSTER | BAY | MALE | CRAIG NUTTAL | |
| 2003 | ENG | COOL BET | HASTY HALL (USA) | EICARLS QUE PASA (USA) | WESTERN HANOVER | BROWN | FEMALE | NEIL HOLGATE | |
| 2003 | ENG | COUNTRY CAVALIER | CAMP CONWAY (CAN) | COUNTRY LADY T | DISRAELI HANOVER (USA) | BAY | MALE | J G BAINBRIDGE | |
| 2003 | ENG | COUNTRY CHIEF | CAMP CONWAY (CAN) | COUNTRY STARLETTE | ARMBRO WARD (USA) | BAY | MALE | J G BAINBRIDGE | |
| 2003 | IRL | COUSANE PRINCE | SUPER JOIE (GER) | JOLLY LADY | JOLLY CASTLE | BAY | MALE | M.O'RIORDAN | |
| 2003 | GB | CROCKENHILL FREEK | HILTONS COB | CRUISE CONTROL II | PILGRIMS PATRIOT | COL | FEMALE | R HILTON | |
| 2003 | WAL | CROGIES HEAT | WHITE HEAT (USA) | LITTLE GILLIE | RAJAH LOBELL | DK BAY | MALE | K JONES | |
| 2003 | IRL | CROOKHAVEN LADY | TIMON DEL SOL | TINAS PRIDE | RACING KNIGHT | BLACK | FEMALE | D.O'LEARY | |
| 2003 | GB | CROWN DUCHESS | SILKY STALLONE (CAN) | CROWN GEM | SLY HEEL | BAY | FEMALE | TAYLOR FRANK | |
| 2003 | GB | DAWBANK | SURFER HANOVER (USA) | MISS SILK III | FLEET DECISION (USA) | BAY | MALE | PETER MATHER | |
| 2003 | ENG | DAYDREAM BELIEVER | TODAYS MAN (USA) | HOLD THE DREAM | FLEET DECISION | BAY | FEMALE | J N WINTER | |
| 2003 | SCO | DENNIS TANNER | HARDEN (USA) | MY DECISION | FLEET DECISION | BAY | MALE | ERIC WHITESIDE | |
| 2003 | ENG | DENS PRINCESS | COALFORD LAAG | SINGLE GIRL | SINGLE IDEAL (USA) | BAY | FEMALE | D LEONARD | |
| 2003 | IRL | DESIGNER KID | DRIVEN BY DESIGN (USA) | ELVIRA D | LEONARD HANOVER | BROWN | MALE | G.DEAN | |
| 2003 | ENG | DESTINYS BUSINESS | DESTINY SON | BACK IN BUSINESS | PRINCE ERSTER | CHESTNUT | FEMALE | J A TILL | |
| 2003 | GB | DILLYS DESIRE | HOUSE OF CARDS (USA) | DILLYS SWEET MYSTIC | ARMBRO MYSTIC | LB | FEMALE | GILVEAR J & SONS | |
| 2003 | GB | DILLYS DRAGON | HOUSE OF CARDS (USA) | DILLYS PRINCESS | FLEET DECISION | BAY | MALE | GILVEAR J & SONS | |
| 2003 | GB | DILLYS PONTOON | HOUSE OF CARDS (USA) | DILLYS MYSTIC TIME | ARMBRO MYSTIC | BAY | FEMALE | GILVEAR J & SONS | |
| 2003 | GB | DILLYS RED ACE | HOUSE OF CARDS (USA) | LAMOUR LA PLOTT | MACATROSS (USA) | BAY | FEMALE | GILVEAR J & SONS | |
| 2003 | WAL | DONNA LASS | STONERIGGS J R | PRIMA DONNA | SHERMAN ALMAHURST | CHESTNUT | FEMALE | R F PRICE | |
| 2003 | GB | DREAM LOVER |