| Ptak Patricia Kozlowski ( Plymouth, MI ) | PTC International ( Baltimore, MD ) | PTC Therapeutics, Inc. |
| Ptak; Patricia Kozlowski ( Plymouth, MI ) | PTC Organics, Inc. ( Mount Laurel, NJ ) | PTC Therapeutics, Inc. ( Piscataway, NJ ) |
| PTC | PTC Pharma AG( Bern ) | PTC Therapeutics, Inc. ( South Plainfield, NJ ) |
| PTC Aerospace Inc. ( Bantam, CT ) | PTC Therapeutics , Inc. a corporation | |