Prosensa Holding B.V. prices Initial Public Offering

Leiden, the Netherlands—June 27, 2013—Prosensa Holding B.V. (“Prosensa”) announced today the pricing of its initial public offering of 6,000,000 of its ordinary shares at an initial public offering price of $13.00 per share, before underwriting discounts. Prosensa has also granted the underwriters a 30-day option to purchase up to an additional 900,000 ordinary shares to cover over-allotments, if any. The ordinary shares are expected to begin trading on the Nasdaq Global Select Market on June 28, 2013 under the symbol “RNA.”