At The Races insisted "no material impact on ATR's profitability is expected" after it was announced Ascot is to switch broadcaster to Racing UK from the start of the 2014 Royal meeting.
Racecourse Media Group-owned Racing UK are responsible for the majority of Britain's major racecourses, including Cheltenham and Newmarket, and Ascot has decided to follow suit.
At The Races, which has exclusive rights to racing in Ireland, lost Exeter, Kelso and Perth to its rivals earlier this year and Folkestone and Hereford will also be missing from next year's line-up as both racecourses will shortly close down.
Ascot officially joins the Racecourse Media Group on June 12, 2014.
A statement posted on the At The Races website read: "At The Races is naturally disappointed that Ascot has chosen not to continue its relationship with the company from June 2014, a relationship which goes back to 2004 and which has at all times been conducted on the best of terms.
"At The Races enjoyed a record year in 2011 and is on track to surpass those achievements in 2012. As a shareholder in the company, as well as a media rights licensor, Ascot is a major beneficiary of this success and, factoring in the company's growth plans going forward, looked set to reap significant further financial returns longer term.
"No material impact on ATR's profitability is expected as a result of this decision as the company's revenue lines continue to grow and diversify. Ascot's rights accounted for 4% of total ATR revenues in 2011."
Ascot's chief executive Charles Barnett said: "After careful consideration we have decided to extend our relationship with RMG, with whom we recently negotiated the exclusive terrestrial television contract with Channel 4.
"We have also partnered with the RMG courses since 2007 in the provision of our pictures to betting shops through Turf TV.
"Enabling a large percentage of the best of British racing to be promoted by one entity and showcased through one satellite broadcaster mirrors the thinking behind the Channel 4 deal, and it should benefit initiatives like the Qipco British Champions Series."
27 September 2016'All systems go' for Harzand as Arc raid takes shape for Dermot Weld
Nicky Henderson takes the long road to Tipperary with Hargam
Charlie Fellowes pulls off Fairyhouse coup with big gamble Moonlit Show
Fair Eva conqueror Spain Burg to go under the hammer
Adrian Keatley checks in for Concorde Stakes with Jet Setting
Brian Meehan plays waiting game with Cambridgeshire hero Spark Plug
Dandy Nicholls leaning towards Ascot with white-hot sprinter Kimberella
Jim Bolger to resist Dollar cash with Dundalk-bound Qatari Hunter
Minor setback forces Magical Memory into early winter break
Ascot still top of Almanzor agenda despite featuring in Arc field
Trip To Paris in contention for Cadran outing at Chantilly
Frankie Dettori hunting Arc mount after Fascinating Rock is ruled out
'He was nearly picking them up and putting them over the line'
Waterlogging claims Ayr card
Scrutineer floors Danzeno in Hamilton feature
Marracudja gets Paul Nicholls and Ditcheat Thorougbreds off to winning start
Long Distance Cup remains on the agenda for Forgotten Rules
Munster National to honour memory of JT McNamara
Shalaa pencilled in for weekend return at Ascot
'Magnificent Seven' heaven sent for proud Frankie Dettori
Henry Candy sets sights on Chantilly with Limato
Alice Springs and Persuasive in line for rematch in Sun Chariot at Newmarket
Christophe Soumillon receives Silverwave Arc call-up at Chantilly
26 September 2016Precautionary inspection called for Ayr Tuesday card
Colin Tizzard delight at arrival of horses for Alan and Ann Potts
Only Mine signed off for the season by Joe Murphy
Charlie Fellowes hopes Moonlit Show can shine at Fairyhouse
Jarlath Fahey to delay Cesarewitch call with Jennies Jewel
Willie Mullins wants swift resolution to Faugheen 'investigation'
Salisbury Wednesday fixture loses one-mile race
Hamilton Monday card gets go-ahead
Setback rules La Cressonniere out of Prix de l'Arc de Triomphe
Dermot Weld has Tuesday workout plans for Arc hope Harzand
Jim Bolger has Gold Cup dreams for Twilight Payment after Loughbrown Stakes
Aidan O'Brien lines up three-pronged attack on Arc
Capri continues Beresford Stakes domination for Aidan O'Brien
Happy days for Aidan O'Brien in Renaissance Stakes
Classic-winning trainer Tommy Stack to retire at the end of the year
Eziyra puts Classic claims with Curragh success
Wesley Ward finds possible reason for Lady Aurelia Newmarket reverse
25 September 2016Rain threat to Hamilton card on Monday
Dermot Weld has Tuesday workout plans for Arc hope Harzand
Ed Dunlop plays the long game with Red Verdon
Richard Fahey retains faith in vanquished Frankel filly Queen Kindly
One-mile race at Salisbury in jeopardy on Wednesday
Owen Burrows calls time on Massaat season
Henry de Bromhead has chasing in mind for Identity Thief
Ed Vaughan heads to Ascot with Mehronissa
Arc favourite Postponed pleases in Saturday workout
Spark Plug fires up for Cambridgeshire glory at Newmarket
The Last Lion sparks Group One celebrations for birthday boy Joe Fanning
Cheveley Park first for Aidan O'Brien as Brave Anna tops Lady Aurelia
Hugo Palmer has Derby dream for Best Of Days
Paul Hanagan speculation news to me - Angus Gold
Capri leads Aidan O'Brien's four-strong challenge on Beresford heat
Perle De La Mer seeks to sparkle in Park Stakes date
Forgotten Rules aiming to issue Loughbrown reminder
24 September 2016Waterlogging claims Roscommon card
Hugo Palmer retains faith in Escobar despite Newmarket eclipse
No retirement plans for Gordon Lord Byron ahead of Renaissance run
Jack Kennedy sidelined after Downpatrick fall
Fair Eva grounded by French flyer Spain Burg
Cougar Mountain peaks at Newmarket for Aidan O'Brien and Ryan Moore
Newmarket winner Journey takes familiar route towards Ascot
John Gosden has the last Laugh at Newmarket
Bronze Angel bids for third Cambridgeshire gold in vintage renewal
Best Of Days and Hugo Palmer ready for Royal rumble at Newmarket
Blue Point and Mehmas face Middle Park rematch
Wesley Ward expecting Lady Aurelia to show her best in Cheveley Park test
Colm Murphy announces shock retirement news