PTC Therapeutics is on the Cruelty Free Investing list for exploiting animals because the company does animal testing in discovery, development and commercialization of some of their therapeutics.
The company answered in the following document that they conduct pre-clinical trials of their drugs on animals.
“PTC has carefully analyzed this issue in specificity studies in tissue culture systems and in animal models.” (Page 3) Read the following article
PTC Therapeutics, Inc. engages in the discovery, development, and commercialization of orally administered, small molecule therapeutics targeting an area of RNA biology. [Source: MarketWatch]
Company Website: http://www.ptcbio.com