Arzerra Fourth Quarter and Full Year 2012 Net Sales Figures

Company Announcement

• Arzerra worldwide net sales in Q4 2012 totaled GBP 14.5 million
• Full year 2012 Arzerra sales were GBP 60 million, an increase of 38% over 2011
• Genmab royalty income is DKK 27 million for Q4 2012 and DKK 111 million for the year

COPENHAGEN, Denmark; February 6, 2013 - Genmab A/S (Copenhagen:GEN) announced today Arzerra(r) (ofatumumab) net sales during the fourth quarter of 2012 were GBP 14.5 million (approx. DKK 133.2 million). This figure consists of net sales in the U.S. of GBP 10.3 million and in the rest of the world GBP 4.2 million. Under the terms of the collaboration with GlaxoSmithKline (GSK), Genmab expects to receive a royalty payment of approximately DKK 27 million.

Full year 2012 net sales of Arzerra totaled GBP 60 million (approx. DKK 552 million) worldwide, resulting in total royalty income to Genmab of approximately DKK 111 million for the year.

The conversion from GBP to DKK has been made using the Danish Central Bank average rates for the respective quarters in 2012.

About Genmab A/S

Genmab is a publicly traded, international biotechnology company specializing in the creation and development of differentiated human antibody therapeutics for the treatment of cancer.  Founded in 1999, the company's first marketed antibody, ofatumumab (Arzerra(r)), was approved to treat chronic lymphocytic leukemia in patients who are refractory to fludarabine and alemtuzumab after less than eight years in development.  Genmab's validated and next generation antibody technologies are expected to provide a steady stream of future product candidates.  Partnering of innovative product candidates and technologies is a key focus of Genmab's strategy and the company has alliances with top tier pharmaceutical and biotechnology companies.  For more information visit www.genmab.com.

Contact:   Rachel Curtis Gravesen, Senior Vice President, Investor Relations & Communications T: [phone]; M: [phone]; E: [e-mail]

This Company Announcement contains forward looking statements. The words "believe", "expect", "anticipate", "intend" and "plan" and similar expressions identify forward looking statements. Actual results or performance may differ materially from any future results or performance expressed or implied by such statements. The important factors that could cause our actual results or performance to differ materially include, among others, risks associated with pre-clinical and clinical development of products, uncertainties related to the outcome and conduct of clinical trials including unforeseen safety issues, uncertainties related to product manufacturing, the lack of market acceptance of our products, our inability to manage growth, the competitive environment in relation to our business area and markets, our inability to attract and retain suitably qualified personnel, the unenforceability or lack of protection of our patents and proprietary rights, our relationships with affiliated entities, changes and developments in technology which may render our products obsolete, and other factors. For a further discussion of these risks, please refer to the risk management sections in Genmab's most recent financial reports, which are available on www.genmab.com. Genmab does not undertake any obligation to update or revise forward looking statements in this Company Announcement nor to confirm such statements in relation to actual results, unless required by law.

Genmab A/S and its subsidiaries own the following trademarks: Genmab(r); the Y-shaped Genmab logo(r); HuMax(r); HuMax-CD20(r); DuoBody(r), HexaBodyTM and UniBody(r). Arzerra(r) is a trademark of GlaxoSmithKline.

Company Announcement no. 03 CVR no. 2102 3884

Genmab A/S Bredgade 34E 1260 Copenhagen K Denmark