BioRexis raised a first round of financing of $8 million in July 2002. The round was led by ProQuest Investments and Tullis-Dickerson & Company, and also included Quaker BioVentures.
In March 2004, BioRexis raised $30 million in a Series B financing led by Prism Venture Partners and Quaker BioVentures.
The financing was oversubscribed and included new investors Johnson & Johnson Development Corporation, Gund Investment Corporation and Anthem Capital as well as existing investors ProQuest Investments and Tullis-Dickerson & Company.