Open-label study to assess safety and clinical effects of triheptanoin

NOVATO, CA – February 11, 2014 – Ultragenyx Pharmaceutical Inc. (NASDAQ: RARE), a biopharmaceutical company focused on the development of novel products for rare and ultra-rare diseases, today announced that the first patient has been enrolled in an open-label Phase 2 study to assess safety and clinical effects of triheptanoin, also known as UX007, in patients severely affected by long-chain fatty acid oxidation disorders (LC-FAOD). LC-FAOD are a group of autosomal recessive genetic disorders characterized by metabolic deficiencies in which the body is unable to break down and convert long chain fatty acids into energy.

NOVATO, Calif., Feb. 6, 2014 (GLOBE NEWSWIRE) -- Ultragenyx Pharmaceutical Inc. (Nasdaq:RARE), a biopharmaceutical company focused on the development of novel products for rare and ultra-rare diseases, today announced the appointment of Clay B. Siegall, Ph.D. and Matthew Fust to the company's Board of Directors effective January 30, 2014. Dr. Siegall, currently President, Chief Executive Officer and Chairman of the Board of Seattle Genetics, Inc., and Mr. Fust, formerly Executive Vice President and Chief Financial Officer of Onyx Pharmaceuticals, Inc. will serve as independent directors for Ultragenyx. With these additions, Ultragenyx extends gratitude and appreciation for the counsel provided by Mr. Ben Auspitz, who has resigned from his position on the Board effective January 30, 2014.

NOVATO, Calif., Feb. 5, 2014 (GLOBE NEWSWIRE) -- Ultragenyx Pharmaceutical Inc., a biopharmaceutical company focused on the development of novel products for rare and ultra-rare diseases, today announced the closing of its initial public offering of 6,624,423 shares of common stock at an initial public offering price of $21.00 per share, which includes the exercise in full by the underwriters of their option to purchase up to 864,054 additional shares of common stock. All of the shares of common stock were offered by Ultragenyx. The company's common stock is listed on The NASDAQ Global Select Market under the ticker symbol "RARE." Ultragenyx estimates net proceeds from the offering to be approximately $126.4 million, after deducting underwriting discounts and commissions and estimated offering expenses.

Upper extremity muscle strength composite shows statistically significant difference between the 6 gram and 3 gram dose groups

Novato, CA — December 20, 2013 — Ultragenyx Pharmaceutical Inc., a biopharmaceutical company focused on the development of novel products for rare and ultra-rare diseases, today announced topline results from a 48-week Phase 2 clinical study of sialic acid extended-release (SA-ER, UX001) tablets in 46 patients with hereditary inclusion body myopathy (HIBM), a progressive muscle-wasting disease. SA-ER is designed to replace the deficient sialic acid substrate in patients with HIBM. Patients were initially randomized to either receive placebo, 3 grams or 6 grams of SA-ER per day. After 24 weeks, placebo patients crossed over to either 3 grams or 6 grams total daily dose, on a blinded basis, for an additional 24 weeks. The final analysis compared change at week 48 from baseline for the combined groups at 6 grams versus 3 grams of SA-ER.

Phase 2 Clinical Study Expected to Begin in the First Half of 2014
NOVATO, CA – December 17, 2013 – Ultragenyx Pharmaceutical Inc., a biopharmaceutical company focused on the development of novel products for rare and ultra-rare diseases, announced today that its Investigational New Drug (IND) application
filing for triheptanoin (UX007) for the treatment of glucose transporter type-1 deficiency syndrome (Glut1 DS) is in effect. The IND allows the company to proceed with its clinical development program for triheptanoin in Glut1 DS in the United States. The company plans to initiate a Phase 2 trial studying triheptanoin in Glut1 DS in the first half of 2014.