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Ultragenyx Announces Positive Phase 3 Results for DTX301

Story Highlights
  • Ultragenyx’s Phase 3 Enh3ance trial showed DTX301 significantly lowered ammonia levels and improved clinical outcomes in OTC deficiency patients versus placebo.
  • The ongoing study will assess treatment burden reduction through 64 weeks, with 2027 data expected as Ultragenyx manages the program toward its profitability goal.
  • Looking for the best stocks to buy? Follow the recommendations of top-performing analysts.
Ultragenyx Announces Positive Phase 3 Results for DTX301

Meet Samuel – Your Personal Investing Prophet

Ultragenyx Pharmaceutical ( (RARE) ) has shared an announcement.

On March 12, 2026, Ultragenyx reported positive Phase 3 Enh3ance trial results for DTX301, its investigational AAV8 gene therapy for ornithine transcarbamylase deficiency, showing an 18% reduction in 24-hour plasma ammonia levels versus placebo at Week 36 and maintenance of average ammonia exposure within the normal range. Patients on DTX301 rapidly improved ammonia control despite reduced use of ammonia scavenger medications and higher protein intake, reported better symptom and daily living scores than placebo, and experienced fewer hyperammonemic crises and deaths, while safety remained consistent with earlier studies and the program is being advanced within existing spending plans and a goal of profitability in 2027.

The study’s planned second primary endpoint will assess reduction in treatment burden, including medication and dietary restrictions, across treated and placebo-crossover groups through 64 weeks, with data expected in the first half of 2027, potentially positioning DTX301 as a meaningful new option in OTC deficiency care. The company indicated that the conduct of this late-stage program aligns with its February 2026 financial guidance and is being managed to support its target of reaching profitability in 2027, underscoring both clinical and operational progress for stakeholders.

The most recent analyst rating on (RARE) stock is a Buy with a $74.00 price target. To see the full list of analyst forecasts on Ultragenyx Pharmaceutical stock, see the RARE Stock Forecast page.

Spark’s Take on RARE Stock

According to Spark, TipRanks’ AI Analyst, RARE is a Neutral.

The score is primarily held back by weak financial performance: large ongoing losses, significant cash burn, and a sharply reduced equity base. Technicals also remain unfavorable with the stock trading below major moving averages and negative MACD. Offsetting these risks, the latest earnings call provided constructive forward guidance on revenue growth and planned cost reductions aimed at reaching profitability in 2027, but execution and regulatory risks remain significant.

To see Spark’s full report on RARE stock, click here.

More about Ultragenyx Pharmaceutical

Ultragenyx Pharmaceutical Inc. is a biotechnology company focused on developing gene therapies and other treatments for rare metabolic and genetic diseases. Its pipeline includes investigational adeno-associated virus (AAV) gene therapies such as DTX301, which targets patients with ornithine transcarbamylase deficiency who remain symptomatic despite current standard-of-care drugs and strict dietary management.

Average Trading Volume: 2,838,056

Technical Sentiment Signal: Sell

Current Market Cap: $2.15B

For a thorough assessment of RARE stock, go to TipRanks’ Stock Analysis page.

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