Core Viewpoint - The FDA issued a Complete Response Letter (CRL) for Ultragenyx's Biologics License Application (BLA) for UX111, a gene therapy for Sanfilippo syndrome type A, citing specific chemistry, manufacturing, and controls (CMC) observations that are resolvable [1][2] Group 1: Company Overview - Ultragenyx Pharmaceutical Inc. is focused on developing therapies for rare and ultra-rare genetic diseases, with a diverse portfolio aimed at addressing high unmet medical needs [6] - The company is led by a management team experienced in rare disease therapeutics, emphasizing time- and cost-efficient drug development [7] Group 2: Product Information - UX111 is an in vivo gene therapy in Phase 1/2/3 development for Sanfilippo syndrome type A (MPS IIIA), a rare fatal lysosomal storage disease with no approved treatment [4] - The therapy targets the SGSH enzyme deficiency, which leads to the accumulation of heparan sulfate in the brain, causing neurodegeneration [4] - UX111 is administered via a one-time intravenous infusion using a self-complementary AAV9 vector to deliver a functional copy of the SGSH gene [4] Group 3: Regulatory Status - The FDA's CRL did not raise any issues regarding the clinical data package or clinical inspections, acknowledging the robustness of the neurodevelopmental outcome data and supportive biomarker data [3] - The company plans to address the CMC observations and resubmit the BLA, anticipating a review period of up to 6 months post-resubmission [2][3] Group 4: Disease Context - Sanfilippo syndrome type A (MPS IIIA) affects approximately 3,000 to 5,000 patients in commercially accessible areas, characterized by rapid neurodegeneration and a median life expectancy of 15 years [5] - The disease is caused by biallelic pathogenic variants in the SGSH gene, leading to a deficiency in the sulfamidase enzyme [5]

Company Overview - Ultragenyx (RARE) shares increased by 5.1% to $41.44 in the last trading session, with a notable trading volume [1] - The stock has also gained 5.1% over the past four weeks [1] Pipeline Progress - The rise in stock price is linked to positive investor sentiment regarding Ultragenyx's late-stage pipeline, particularly the regulatory application for FDA approval of UX111, a gene therapy for Sanfilippo syndrome type A, currently under Priority Review with a decision expected on August 18, 2025 [2] - Ultragenyx plans to submit a biologics license application for DTX401, an AAV8 gene therapy for glycogen storage disease type Ia, which could further enhance revenue if approved [2] Financial Expectations - The company is projected to report a quarterly loss of $1.27 per share, reflecting a year-over-year increase of 16.5%, with expected revenues of $161.61 million, up 9.9% from the previous year [3] - The consensus EPS estimate for the quarter has remained unchanged over the last 30 days, indicating that stock price movements may not sustain without trends in earnings estimate revisions [4] Industry Context - Ultragenyx operates within the Zacks Medical - Biomedical and Genetics industry, where another company, Fortress Biotech (FBIO), saw a 3.1% increase in its stock price, closing at $1.99, although FBIO has returned -7.2% over the past month [4] - Fortress Biotech's consensus EPS estimate for its upcoming report is -$0.31, which is a 57.5% improvement from the previous year, and it also holds a Zacks Rank of 3 (Hold) [5]

Key Takeaways The FDA granted Breakthrough Therapy designation to Ultragenyx's GTX-102 for Angelman syndrome. GTX-102 showed rapid, lasting improvements in AS patients during a phase I/II study over up to 3 years. RARE is enrolling for a phase III Aspire study and planning a broader phase II/III Aurora study for GTX-102.Ultragenyx Pharmaceuticals (RARE) announced that the FDA has granted the Breakthrough Therapy designation to its investigational antisense oligonucleotide therapy, GTX-102 (apazunersen), t ...

Corporate Presentation May 2025 Confidential and Proprietary Forward looking statements Cautionary note regarding forward-looking statements: This presentation contains forward-looking statements, including, but not limited to, statements regarding our expectations, estimates, assumptions, and projections regarding our future operating results and financial performance, including our expectations for profitability in 2027, anticipated cost or expense management, plans with respect to commercializing our pro ...