THE Mariga family’s Coolmara Stables upped the ante in their flat investment when buying broodmare Helenium through bloodstock agent Conor Quirke for €600,000 on Wednesday. The Frankel half-sister to Calyx was one of five lots to sell for six-figures at Auctav’s sale of stock owned by leading owner/breeder Jean-Pierre Dubois, who bought back 47 of the 100 horses offered.