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Prothena Corp Public Ltd Co (NASDAQ:PRTA)

IE · Delayed Price · Currency is USD
8.69-0.10 (-1.08%)
 
Market Cap454.69M-11.0%
Revenue (ttm)54.53M+427.3%
Net Income-43.99M+85.5%
EPS-0.84+85.1%
Shares Out52.35M
PE Ration/a
Forward PEn/a
Dividendn/a
Ex-Dividend Daten/a
Volume46,179.801
Open8.98
Previous Close8.78
Day's Range8.58 - 8.98
52-Week Range7.73 - 11.80
Betan/a
AnalystsBuy
Price Target30.00(+245.42%)
Earnings DateNov 5, 2026
-3.42% (1D)
No price history available.
Insider Score
/ 100
PRTA Insider Score

PROTHENA CORP PUBLIC LTD CO has a live Insider Score.

Scored on 0 qualifying trades from 0 insiders in the last 90 days.

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About PRTA

Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation. Its product pipeline includes Prasinezumab, an investigational humanized monoclonal antibody which is in Phase 3 clinical trial for the treatment of parkinson's disease and other synucleinopathies. The company also develops Coramitug, an investigational antibody, which is in Phase 3 clinical trial for the treatment of transthyretin amyloidosis; BMS-986446, an anti-tau antibody which is in Phase 2 clinical trial to treat Alzheimer's disease; PRX019, an investigational antibody which is in Phase 1 clinical trial for the treatment of neurodegenerative diseases; and PRX123, a Dual Aß-Tau Vaccine, which is in preclinical trial for treating Alzheimer's disease. In addition, it develops discovery- and late-preclinical-stage programs include TDP-43 CYTOPE for the treatment of amyotrophic lateral sclerosis; PRX012, a next-generation anti-Aß antibody which is in phase 1 clinical trial to treat Alzheimer's disease; and PRX012-TfR, a preclinical program for the treatment of Alzheimer's disease. It has a license, development, and commercialization agreement with F. Hoffmann-La Roche Ltd. and Hoffmann-La Roche Inc. to develop and commercialize antibodies that target a-synuclein, including prasinezumab; and master collaboration agreement with Bristol Myers Squibb to develop and commercialize antibodies targeting tau, TDP-43. Prothena Corporation plc was incorporated in 2012 and is based in Dublin, Ireland.

Address
77 Sir John Rogerson’s Quay, Dublin, DU, D02 VK60, IE
Market Cap
455 million
Employees
67
Industrial Classification
Biotechnology

What Are Insiders Doing?

Open-market buy / sell balanceNet Buying
Sold
$135.97K
Bought
$5.85M

View the trades behind this meter — each links to its SEC Form 4 →

Open-market Form 4 purchases (code P) vs sales (code S) on file for this company. Grants, option exercises and tax withholdings are excluded. Informational only.

1 Day
-1.08%
5 Days
+3.64%
1 Month
-6.91%
6 Months
-6.11%
1 Year
-11.01%

$PRTA stock is featured in our Insider Score Rankings, and Insider Trades datasets.

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Recently reported changes in PRTA holdings by institutional investors

Scanning latest 13F filings…

Latest 0 13F filings · Source: SEC EDGAR

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Insider Trading

Quarterly net insider trading by PRTA's directors and management

Net Shares Purchased by Insiders−400k−200k02025Q32025Q42026Q12026Q22026Q3

Source: SEC EDGAR (Form 4)

Corporate Lobbying

PRTA Estimated quarterly lobbying spending

Source: U.S. Senate LDA

U.S. Patents

New PRTA patent grants

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Source: USPTO Open Data Portal

Government Contracts

Estimated quarterly amount awarded to PRTA from public contracts

Source: USAspending.gov

Top ETF Holders

ETFs with the largest estimated holdings in PRTA

ETFEst. Holding Size
IWMiShares Russell 2000 ETF$9.80M
XBIState Street SPDR S&P Biotech ETF$7.87M
VXFVanguard Extended Market ETF$4.58M
IBBiShares Biotechnology ETF$2.93M
VTWOVanguard Russell 2000 ETF$2.39M
IWOiShares Russell 2000 Growth ETF$2.08M

Estimated from each fund’s disclosed top holdings × AUM

PRTA Insider Score

Our composite score: insider buying, sector, volume, tone & dilution

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Bull Case vs Bear Case

AI-generated from PRTA’s recent data — informational, not investment advice

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Insider Score

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Recent Insider Activity

Buys
11
Sells
2
Buy Value
$5.85M
Distinct Buyers
1

Frequently Asked Questions

Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.
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