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Below is a table of the PRTA shares outstanding history going back to 12/18/2012:
Also see: PRTA Market Cap History PRTA YTD Return |
PRTA Shares Outstanding History — Prothena Share Count Over Time
As of 7/30/2026 Prothena has 51.34 million PRTA shares outstanding. Investors often track the PRTA shares outstanding history to compare shareholder return trends against the change in share count over time.
This page shows PRTA share count trends over time, with 56 historical shares outstanding datapoints presented, dating back to 12/18/2012.
| PRTA Shares Outstanding History Chart | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
PRTA Historical Shares Outstanding: +8.13% CAGR 
Mouse over chart for data details
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| PRTA Stock Price Chart |
| About Prothena Corp Plc |
| Prothena Corporation plc is an Ireland-based late-stage clinical biotechnology company. Co. is engaged in protein dysregulation and a pipeline of investigational therapeutics for rare peripheral amyloid diseases. Co. is advancing a pipeline of therapeutic candidates for a range of indications and targets to integrate scientific insights around neurological dysfunction and the biology of misfolded proteins. Co.'s pipeline includes both wholly owned and partnered programs being developed for the potential treatment of diseases, including AL amyloidosis, ATTR amyloidosis, Alzheimer's disease, Parkinson's disease and a range of other neurodegenerative diseases. We show 56 historical shares outstanding datapoints in our coverage of PRTA's shares outstanding history. Understanding the changing numbers of PRTA shares outstanding — and comprehending the concept of differing number of shares outstanding in general comparing companies like PRTA versus peers — is critical for investors. Many "beginner" or "novice" investors will look at one stock trading at a price of $10 per share and another trading at a price of $20 per share and think the latter company is worth twice as much. Of course, that is a completely meaningless comparison without also knowing how many shares outstanding there are for each of the two companies. Furthermore, via issuance of new shares over time, or the repurchase of existing shares, the number of shares outstanding can fluctuate over the course of history. With this page we aim to empower investors researching PRTA by allowing them to research PRTA shares outstanding history as well as any other stock in our coverage universe. |
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| PRTA Share Performance |
| Shares Outstanding Peers |
| Prothena (PRTA) is categorized under the Healthcare sector; to help you further research historical shares outstanding numbers, below are some other companies in the same sector:
PRTK Shares Outstanding History PRTO Shares Outstanding History PRVA Shares Outstanding History PRVB Shares Outstanding History PRVL Shares Outstanding History PSNL Shares Outstanding History PSTI Shares Outstanding History PSTV Shares Outstanding History PSTX Shares Outstanding History PTCT Shares Outstanding History More Healthcare companies » |
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