Release Details

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PTC THERAPEUTICS TO JOIN RUSSELL 2000 INDEX

September 30, 2013
SOUTH PLAINFIELD, NJ – September 30, 2013 – PTC Therapeutics, Inc. (NASDAQ: PTCT) today announced that it was included on the list of quarterly initial public offering additions to the Russell 2000® Index to be effective at the close of the U.S. market on September 30, 2013.

"We are very pleased to be included in the Russell 2000® Index," stated Stuart W. Peltz, Ph.D., Chief Executive Officer, PTC Therapeutics, Inc. "Our inclusion in the Russell 2000® index will benefit our shareholders by providing exposure to a broader investor base. It is an exciting time for the biotech industry as companies like PTC work to develop drugs for rare disorders where there are limited or no approved treatment options."

The Russell 2000® Index, a subset of the Russell 3000® Index, measures the performance of the small-cap segment of the U.S. equity market. The Russell 2000® Index includes approximately 2,000 of the smallest securities based on a combination of their market cap and current index membership. In addition to Russell's annual reconstitution that takes place in early June of each year, eligible initial public offerings (IPOs) are added on a quarterly basis. PTC completed its IPO on June 25, 2013.

ABOUT PTC THERAPEUTICS, INC.

PTC is a biopharmaceutical company focused on the discovery, development, and commercialization of orally administered small-molecule drugs that target post-transcriptional control processes. Post-transcriptional control processes regulate the rate and timing of protein production and are of central importance to proper cellular function. PTC's internally discovered pipeline addresses multiple therapeutic areas, including rare genetic disorders, oncology and infectious diseases. PTC has developed proprietary technologies that it applies in its drug discovery activities and are the basis for collaborations with leading biopharmaceutical companies. For more information, visit the company's web site at www.ptcbio.com.

FOR MORE INFORMATION PLEASE CONTACT:

Jane Baj

+1 (908) 912-9167

jbaj@ptcbio.com

FORWARD LOOKING STATEMENTS:

Any statements in this press release about future expectations, plans and prospects for the Any statements in this press release about future expectations, plans and prospects for the Company, the development of and potential market for the Company's product candidates and other statements containing the words "anticipate," "believe," "estimate," "expect," "intend," "may," "plan" "predict," "project," "target," "potential," "will," "would," "could," "should," "continue," and similar expressions, constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Forward-looking statements involve substantial risks and uncertainties that could cause our future results, performance or achievements to differ significantly from those expressed or implied by these forward-looking statements. Such risks and uncertainties include, among others, those related to the initiation and conduct of clinical trials, availability of data from clinical trials, expectations for regulatory approvals, our scientific approach and general development progress, the availability or commercial potential of our product candidates and other factors discussed in the "Risk Factors" section of the final prospectus for our initial public offering, which is on file with the Securities and Exchange Commission. In addition, the forward-looking statements included in this press release represent the Company's views only as of the date of this release. The Company anticipates that subsequent events and developments will cause the Company's views to change. However, while the Company may elect to update these forward-looking statements at some point in the future, the Company specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing the Company's views as of any date subsequent to the date of this release.