The collection of the insolvency estate is one of the important phases of insolvency proceedings. The Bulgarian Commerce Act (Issue No. 48 dated 18 June 1991, as amended) (the “Act”) provides certain tools to facilitate the collection of funds and other assets in order to “maximise” the insolvency estate. One such tool is the ability of the insolvency administrator, or the creditors to the insolvency estate, to challenge the validity of acts and transactions performed by the insolvent company after the insolvency trigger date.