Is Prothena Corporation plc Stock Good For Long-Term Investing?

Prothena Corporation plc (NASDAQ:PRTA) traded at $5.75 at close of the session on Friday, June 20 and made an upward move of 5.72% on its previous day’s price.

Looking at the stock we see that its previous close was $24.29 and the beta (5Y monthly) reads -0.079 with the day’s price range being $5.64 – $6.05. In terms of its 52-week price range, PRTA has a high of $25.42 and a low of $4.32. The company’s stock has lost about -21.54% over that past 30 days.

Prothena Corporation plc has a market cap of $307.89 million and is expected to release its quarterly earnings report on 2025-May-08.

Based on estimates by 15 analysts, where scores have ranged from 1.00 for a strong buy to 5.00 for a strong sell, 3 have rated the Prothena Corporation plc (PRTA) stock as a Hold, while 11 rate it as a Buy. 0 analyst(s) rate it as overweight while 0 of them rated it as underweight, whereas 1 suggest the stock as a Sell. The stock has an overall rating of Buy and investors could take advantage and scoop up stock of the company.

Looking further, we note the current price level is 163 off its SMA20 and 0.02 from its 50-day simple moving average. The beta value is -75.05%, while the average true range (ATR) is currently pointing at -40.17%. The average price target for the stock over the next 12 months is $56, with the estimates having a low of $24 and a high of $98. These price ends are -317.39% and -1604.35% off the current price level respectively, although investors could be excited at the prospect of a -873.91% if the PRTA share price touches on the median price of $56.

Coming back to Prothena Corporation plc (NASDAQ:PRTA), we note that the average 3-month trading volume was 2.35, while that of the preceding 10-day period stands at 2.05 million. Current shares outstanding are 53.83 million.

The insiders hold 21.38% of the company’s shares while institutions hold 70.13%. The data shows that short shares as of 2025-05-30, stood at 4.41 million at a short ratio of 1.67. This represents a 1543.00 short interest in shares outstanding on 2025-05-30. Shares short fall in May from the previous month at 7.45 million. Investors should be excited about this stock as its upside potential is great, with current price pushing the stock -71.92% down in year-to-date price movement.

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