Prothena Corporation plc (PRTA)
Prothena Corporation plc at a glance — key fundamentals, SEC filings, insider buying and selling, and earnings dates.
Prothena Corporation plc (PRTA) is a Biotechnology company based in IE with a market capitalization of $458.1M. Revenue declined 92.8% year-over-year and free cash flow was negative at -$163.7M. This page tracks PRTA's SEC filings, insider buying and selling, earnings dates, and key fundamentals in one place.
IE · 163 employees · IPO Dec 18, 2012
Valuation
Valuation & price
$9.76as of May 17, 2026· -15.2% vs 52w high
—
P/E ratio
Latest-FY diluted EPS
1.63
P/B ratio
Market cap ÷ book equity
—
Dividend yield
Price — last 12 months
Fundamentals
Key fundamentals
$458.1M
Market cap
-92.8%
Revenue growth (YoY)
61.8%
Gross margin
-$163.7M
Free cash flow (USD)
-$293.7M
Net debt
Net cash position
0.1%
Share dilution
1/5
Graham criteria passed
Defensive-investor screen
Healthcare
Sector
Trajectory
Long-term trends
Revenue by year
2016 → 2025
Free cash flow by year
2016 → 2025
Gross margin by year
2021 → 2025
Value screen
Graham defensive-investor tests
5
Insider buys · 90 days
0
Insider sells · 90 days
Earnings
Last report: 10-Q filed May 7, 2026
Next expected: not yet scheduled
On the tape
Recent SEC & insider activity
- Insider buyJun 18, 2026Filing
Insider Buy $158KSCULLY WILLIAM P · 10% Owner · $158K
- Insider buyJun 12, 2026Filing
Insider Buy $1.0MSCULLY WILLIAM P · 10% Owner · $1M
- Insider buyJun 5, 2026Filing
Insider Buy $465KSCULLY WILLIAM P · 10% Owner · $465.3K
- Insider buyJun 3, 2026Filing
Insider Buy $471KSCULLY WILLIAM P · 10% Owner · $471.3K
- Insider buyMay 26, 2026Filing
Insider Buy $981KSCULLY WILLIAM P · 10% Owner · $981.3K
- 8-K eventMay 15, 2026Filing
Annual Shareholder Meeting
- 8-K eventMay 7, 2026Filing
Earnings Release
- Quarterly reportMay 7, 2026Filing
10-Q Filed
Questions
Frequently asked questions
What is Prothena Corporation plc's market cap?
Prothena Corporation plc (PRTA) has a market capitalization of $458.1M.
What is PRTA's P/E ratio?
A meaningful P/E ratio is not available for PRTA — the company's latest fiscal-year earnings per share is zero, negative, or not yet cached.
What is PRTA's price-to-book (P/B) ratio?
PRTA trades at 1.63 times book value per share.
Are insiders buying PRTA stock?
Yes — SEC Form 4 filings show 5 open-market insider buys and 0 sells at Prothena Corporation plc in the last 90 days.
Same arena
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Timeline
Every filing, insider trade & earnings on a price-anchored timeline
Filing Analyzer
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News
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Data: SEC EDGAR filings and cached fundamental data; prices and ratios use the most recent cached quote and statements (may lag by up to a day). Educational and research purposes only. Not investment advice.