X0206 3 2013-06-19 0 0001070081 PTC THERAPEUTICS, INC. PTCT 0001185039 ALDRICH RICHARD 1365 MAIN STREET WALTHAM MA 02451 1 0 0 0 Stock Option (right to buy) 10.85 2023-05-15 Common Stock 20000 D Series Four Senior Preferred Stock Common Stock 583333 I See footnote This option was granted on May 15, 2013 and vests over three years, with 8.33% of the shares underlying the option vesting on August 15, 2013 and an additional 8.33% of the original number of shares underlying the option vesting at the end of each successive three-month period thereafter. The Series Four Senior Preferred Stock has no expiration date. Each share of Series Four Senior Preferred Stock will convert automatically into one share of Common Stock upon the closing of PTC Therapeutics, Inc.'s initial public offering without payment of further consideration. Shares held directly by Longwood Fund LP. The managing members of Longwood Fund LP, including Mr. Aldrich, share voting and investment power with respect to the shares held by such entity. Mr. Aldrich disclaims beneficial ownership of the shares held by Longwood Fund LP except to the extent of any pecuniary interest therein. Exhibit Index: 24.1 Power of Attorney /s/ Richard Aldrich 2013-06-19