Delfin, the holding of Fonciere des Regions' main shareholder Del Vecchio, is further increasing its stake in the French office property group with the acquisition of warrants to be converted into shares representing 1.74% of the group's capital. The operation will allow the Luxembourg-based holding to control a 23.4% stake in FDR, up from 21.66% held previously. The warrants were sold by Batipart, FDR's second largest shareholder.