Genmab A/S Reduces Fair Value of Minnesota Manufacturing Facility to Zero, Moves Sale into 2013 and Updates 2012 Guidance

Copenhagen, Denmark; December 13, 2012 – Genmab A/S (OMX: GEN) announces a change to the previous guidance from November 7, 2012 to reflect the reduction in value of the Minnesota manufacturing facility and a move of the sale into 2013.