Negative sentiment towards RARE reflected in surge in short interest

Investors can speculate about the future of a stock by watching how its insiders buy and sell stocks. Ultragenyx Pharmaceutical Inc shares valued at $20,405 were sold by Crombez Eric on May 05 ’25. At $39.24 per share, Crombez Eric sold 520 shares. The insider’s holdings dropped to 71,530 shares worth approximately $2.81 million following the completion of this transaction.

Also, Crombez Eric sold 242 shares, netting a total of over 8,497 in proceeds. Following the sale of shares at $35.11 each, the insider now holds 71,680 shares.

Before that, Horn Howard had sold 1,785 shares from its account. In a trade valued at $72,114, the Chief Financial Officer traded Ultragenyx Pharmaceutical Inc shares for $40.40 each. Upon closing the transaction, the insider’s holdings decreased to 1,785 shares, worth approximately $4.17 million.

As published in their initiating research note from William Blair on May 28, 2025, Ultragenyx Pharmaceutical Inc [RARE] has been an Outperform. Analysts at Goldman upgraded the stock from ‘”a Neutral”‘ to ‘”a Buy”‘ outlook in a report released in early June. As of April 22, 2024, RBC Capital Mkts has initiated its “an Outperform” rating for RARE. Earlier on December 08, 2023, Wells Fargo initiated its rating. Their recommendation was “an Overweight” for RARE stock.

Analyzing RARE Stock Performance

On last trading session,, Ultragenyx Pharmaceutical Inc [NASDAQ: RARE] rose 4.75% to $39.29. The stock’s lowest price that day was $37.11, but it reached a high of $40.17 in the same session. During the last five days, there has been a surge of approximately 6.45%. Over the course of the year, Ultragenyx Pharmaceutical Inc shares have dropped approximately -6.61%.

Support And Resistance Levels for Ultragenyx Pharmaceutical Inc (RARE)

RSI (Relative Strength Index) is 64.64 on the 14-day chart, showing neutral technical sentiment.

Is Ultragenyx Pharmaceutical Inc subject to short interest?

Stocks of Ultragenyx Pharmaceutical Inc saw a sharp rise in short interest on 2025-05-30 jumping by 11003.0 shares to 5.55 million. Data from Yahoo Finance shows that the short interest on 2025-04-30 was 5.54 million shares. A jump of 0.2% in short interest reflects a negative sentiment towards the stock. Despite the fact that short shares comprise just 5.45 of the overall float, the days-to-cover ratio (short ratio) jumped to 5.45.

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