PRTA today
$8.23-$0.50 (-5.73%)close Nov 12, 2026Trend
DailyDowntrend (starting)
4 hourStrong Bearish
1 hourStrong Bearish
15 minStrong Bearish
5 minStrong Bearish
Daily trend turns up above $11.80
Key levels
Resistance$9.26
Resistance$8.65
Support$7.93
Latest news & SEC filings
NewsProthena Corporation plc Insider Buys Over $1.1 Million in Shares
SEC FilingProthena Corp Public Ltd Co filed an insider trading report (Form 4)
EarningsProthena Posts Q3 2026 Results, Notes Business Updates
EarningsProthena Q3 EPS $(0.32), sales $620,000
All PRTA news →About Prothena
Prothena is a clinical-stage biotechnology company that develops treatments for conditions involving misfolded proteins. Its pipeline includes antibody candidates for neurodegenerative and peripheral amyloid disorders, advanced both on its own and through alliances with larger pharmaceutical firms. The company is based in Ireland and the United States, and its shares trade on Nasdaq.
Based on the company's 10-K filed Feb 27, 2026.
Nasdaq · Healthcare
PROTHENA CORP PUBLIC LTD CO (PRTA)
What Is the Price Target for PRTA?
SEPT Low Target
$20.00
SEPT Mid Target
$20.00
SEPT High Target
$20.00
Analyst Consensus
$20.00
Is PRTA a Buy or Sell Right Now?
Thesis
- •Revenue growing -92.8% YoY with STABLE trend — consistent growth.
- •Smart money flows are positive — institutional and insider activity shows net buying.
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Trained on trillions of real market data to read price action and give you a simple, emotionless trading strategy for PRTA.
Start Free Trial →Is PRTA Overvalued or Undervalued?
Valuation Verdict
UNDERVALUED
Methods Used
P/E Forward, Analyst Consensus
Fair Value
$15.53
19
Moat Score
NONE
1/9
Piotroski Score
-1.1
Altman Z-Score
What Is Smart Money Doing with PRTA?
Insider Signal
BUYING
15 buys / 0 sells (90d)
Congress Signal
NEUTRAL
0 buys / 0 sells (90d)
Institutional
N/A
Short Squeeze Risk
HIGH
Signal: HIGH_SHORT_INTEREST
Recent Insider Activity
| Name | Title | Type | Shares | Value | Date |
|---|---|---|---|---|---|
| SCULLY WILLIAM P | 10% owner | Buy | 140,000 | $1.2M | Nov 9, 2026 |
| SCULLY WILLIAM P | 10% owner | Sale | 916,444 | - | Nov 6, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 566,444 | - | Oct 27, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 50,000 | $404K | Oct 23, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 100,000 | $819K | Oct 22, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 10,000 | $85K | Oct 14, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 100,000 | $835K | Oct 13, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 90,000 | $771K | Oct 8, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 125,000 | $1.1M | Oct 7, 2026 |
| SCULLY WILLIAM P | 10% owner | Buy | 100,000 | $857K | Oct 2, 2026 |
Track Smart Money Across 4,000+ Stocks
Insider trades, congress trades, institutional flows, and short interest — updated daily with real-time alerts.
See All Smart Money Signals →PRTA Growth Story
Revenue YoY
-92.8%
3yr Revenue CAGR
-43.6%
EPS Growth YoY
-99.56%
FCF Growth YoY
N/A%
Revenue Trend
STABLE
Dark Pool Trades for PRTA
PREVIEWSEPT Investing tracks real-time dark pool institutional trades for PRTA, including block trade sizes, dollar values, and buy/sell side classification. Dark pool trades reveal where institutional investors are positioning before moves become visible on public exchanges.
| Time | Price | Size | Value | Side |
|---|---|---|---|---|
| 21:00:27 | $8.23 | 2,326 | $$19K | SELL |
| 21:00:27 | $8.23 | 1,611 | $$13K | SELL |
| 20:35:43 | $8.23 | 1,100 | $$9K | MIDPOINT |
| 20:27:00 | $8.32 | 1,825 | $$15K | BUY |
| 19:46:15 | $8.25 | 1,000 | $$8K | SELL |
5 dark pool trades shown · $$65K preview volume
Real-time institutional flow, block trades, and net positioning
Full AI Research Report
SEPT's Trading AI has generated a free, downloadable PDF research report for PROTHENA CORP PUBLIC LTD CO (PRTA) covering valuation analysis, financial health assessment, growth projections, smart money tracking, earnings and key price levels. For research only, not investment advice.
Report includes: PDF download, detailed valuation models (DCF, P/E, EV/EBITDA), institutional flow analysis, congress and insider trade tracking, FinBERT news sentiment (1 articles analyzed), and SEC filing intelligence...
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Trained on trillions of real market data to read price action and give you a simple, emotionless trading strategy. SEPT tells you when to buy, when to sell, and grades every stock so you never trade blind.
Try SEPT Free for 7 Days →PRTA — frequently asked questions
What is PRTA stock price today?
PROTHENA CORP PUBLIC LTD CO (PRTA) is at $8.23, down 5.73% (-$0.50) at the Nov 12, 2026 close.
Why is PRTA stock moving today?
Latest PRTA news — Nov 10, 2026: Prothena Corporation plc Insider Buys Over $1.1 Million in Shares · Nov 10, 2026: Prothena Corp Public Ltd Co filed an insider trading report (Form 4)
What is the PRTA price target?
The average analyst price target for PRTA is $20.00, ranging from $20 to $20, based on 1 analysts. Latest: Citizens maintains on May 8, 2026.
What do analysts rate PRTA?
Analyst ratings for PRTA: 0 Buy, 1 Hold, 0 Sell — consensus Hold.
Did PRTA beat earnings?
PRTA last reported on Aug 7, 2026: EPS -$0.36 vs -$0.09 expected — a miss of 300.0%.
Does PRTA pay a dividend?
PRTA does not currently pay a dividend.
What are PRTA support and resistance levels?
Support: $7.93. Resistance: $8.65, $9.26, $9.87.
What are insiders doing with PRTA?
Insider activity: BUYING, 15 buys and 0 sells in the last 90 days.
What is the latest news on PRTA?
Nov 10, 2026: Prothena Corporation plc Insider Buys Over $1.1 Million in Shares · Nov 10, 2026: Prothena Corp Public Ltd Co filed an insider trading report (Form 4) · Nov 5, 2026: Prothena Posts Q3 2026 Results, Notes Business Updates