Small stakes

The top two contenders for the Republican presidential nomination disclosed their 2011 tax returns last week, revealing that both Newt Gingrich and Mitt Romney owned modest holdings in the life sciences sector.

According to Gingrich's filing, the former Georgia lawmaker bought $4,735 worth of oncology and immunology company Celgene Corp. (NASDAQ:CELG) in May 2009, which he sold in March 2010 for a profit of $2,591. In June 2009, he purchased $5,208 of nutraceuticals play Martek Biosciences Corp., which he sold that December for a $2,004 profit. Royal DSM N.V. (Euronext:DSM) acquired Martek in late 2010...