Ultragenyx Pharmaceutical (RARE) Short Interest Ratio & Short Volume

Short interest is the volume of Ultragenyx Pharmaceutical shares that have been sold short but have not yet been closed out or covered. As of July 15th, traders have sold 8,800,000 shares of RARE short. Learn More on Ultragenyx Pharmaceutical's current short interest.

The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. RARE shares currently have a short interest ratio of 5.0. Learn More on Ultragenyx Pharmaceutical's short interest ratio.

As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Ultragenyx Pharmaceutical: Persistent Asset Partners Ltd, Jane Street Group LLC, and Caption Management LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission.

Ultragenyx Pharmaceutical saw a increase in short interest in the month of July. As of July 15th, there was short interest totaling 8,800,000 shares, an increase of 29.0% from the previous total of 6,820,000 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment.

Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Ultragenyx Pharmaceutical: Moderna, Inc. (19.34%), Viatris Inc. (3.32%), BridgeBio Pharma, Inc. (10.19%), Verona Pharma PLC American Depositary Share (4.77%), Blueprint Medicines Corporation (5.95%), Roivant Sciences Ltd. (10.56%), Grifols, S.A. (0.96%), Legend Biotech Corporation Sponsored ADR (4.57%), Elanco Animal Health Incorporated (4.74%), Revolution Medicines, Inc. (7.31%),

As of the most recent reporting period, the following stocks had the largest short interest positions: Coinbase Global, Inc. ($5.11 billion), Charter Communications, Inc. ($4.76 billion), Reddit Inc. ($2.84 billion), SoFi Technologies, Inc. ($2.79 billion), Seagate Technology Holdings PLC ($2.79 billion), Live Nation Entertainment, Inc. ($2.67 billion), Rocket Lab Corporation ($2.49 billion), AST SpaceMobile, Inc. ($2.12 billion), Moderna, Inc. ($2.09 billion), and Omnicom Group Inc. ($2.04 billion). View all of the most shorted stocks.

Short selling RARE is an investing strategy that aims to generate trading profit from Ultragenyx Pharmaceutical as its price is falling. RARE shares are trading up $0.72 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit.

A short squeeze for Ultragenyx Pharmaceutical occurs when it has a large amount of short interest and its stock increases in price. This forces short sellers to cover their short interest positions by buying actual shares of RARE, which in turn drives the price of the stock up even further.

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including RARE, twice per month. The most recent reporting period available is July, 15 2025.