PTC Therapeutics, Inc. announced a private placement of convertible promissory notes for gross proceeds of $16,100,100 on January 29, 2013. The company also issued warrants to purchase series one preferred stock and series two preferred stock, at an exercise price of $0.01 per share. The securities will be issued pursuant to Regulation D.

As on February 12, 2013, the company received $2,000,100 as part of the first tranche from 25 investors.