Former jockey Charlie Swan is to retire from training at the end of the month.
Swan, 46, who won three Cheltenham Champion Hurdles on Istabraq for trainer Aidan O'Brien and owner JP McManus, stopped riding in 2003.
As a trainer, his Tipperary yard had Grade One wins with Offshore Account and One Cool Cookie at Punchestown and Fairyhouse respectively.
"It has become more and more difficult to make the training operation profitable," he said.
"It was a very hard decision to make in one sense, because of the staff and the owners.
"However, the reality is the training business is no longer viable for me for two main reasons, the increased cost of labour, feed and all the overheads, and a reduction in numbers in the yard.
"Also we have been selling some of the more promising youngsters and that has left us without horses to keep the profile of the stable high."
Among Swan's other training achievements are success in the Scottish Champion Hurdle with Emmpat and the Eider Chase at Newcastle, the Cork Grand National and the Thyestes Chase at Gowran with smart stayer This Is Serious.
Ground Ball also earned him a win in the Dan Moore Memorial Handicap Chase at Fairyhouse with Tony McCoy on board.