Isaacs Michael John
Transaction: 07/29/2026
SELL
Change
-8,386
Price
$8.47
Filing
07/30/2026
Type
SELL
Prothena Corporation plc
PRTA • Biotechnology
$9.82
▲ +0.22 (+2.29%)
Current price
EarningsLatest report: Jun 30, 2026
WEAK PROFILEWeakConfidence: 70%
Quantitative profile — not an investment recommendation.
Quantitative profile — not an investment recommendation.Methodology
Analysis thesis: Weak historical ratio profile. The current evidence does not support a favorable risk/reward view.
Market Cap
$512.06M
Growth
6.5%
Cash Flow
1/5
Trend
Volatile
Evidence
Manageable debt level · 0.05Healthy liquidity · 7.72Negative growth trendWeak profitability
Financial data as of: Jun 30, 2026, 12:00 AM UTCLast earnings update: Jun 30, 2026, 12:00 AM UTCLast profile update: Aug 5, 2026, 2:27 PM UTC
Company Snapshot
Key valuation, quality, financial strength, momentum and analyst data.
Price$9.82
Change2.29%
Shares Out52.15M
Market Cap$512.06M
Enterprise Value$230.86M
52W Range6.73 - 11.80
Beta-0.31
P/E-11.64
P/S9.39
P/B1.78
P/FCF-16.09
EV/Sales4.23
Price$9.82
Change2.29%
Shares Out52.15M
Market Cap$512.06M
Enterprise Value$230.86M
52W Range6.73 - 11.80
Beta-0.31
P/E-11.64
P/S9.39
P/B1.78
P/FCF-16.09
EV/Sales4.23
EV/EBITDA-4.80
EV/FCF-7.25
Earnings Yield-8.59%
FCF Yield-6.22%
Dividend Yield0.00%
Gross Margin61.77%
Oper. Margin-19.06%
Profit Margin-25.21%
Debt/Eq0.05
Current Ratio7.72
Quick Ratio7.72
Revenue 5Y6.46%
Target$24.50
Target Upside149.49%
Target Median$24.50
Target Range19.00 - 30.00
Volume538.25K
Avg Volume581.57K
EPS Surprise0.83
Investment DNA
How strong this company looks for long-term investors
37
out of 100
Business Quality
Margins, moat, returns
22/100
Financial Strength
Debt, cash, stability
76/100
Growth Potential
Revenue and expansion
20/100
Price Attractiveness
Cheap or expensive today
54/100
Why this score▼
Manageable debt level · 0.05Healthy liquidity · 7.72Negative growth trendWeak profitability
Analyst view
Analyst sentiment and price target
Analyst sentiment
Based on 28 analyst votes · 2026-09-05
82/100
Bullish
Bullish
20
Hold
6
Bearish
2
Price Target
2026-08-07
Low
$19.00
Mean
$24.50
Median
$24.50
High
$30.00
Insider Transactions
Recent executive and insider activity
⚠ 1 high-volume insider sell detected
Kingston Anne Evans
Transaction: 07/29/2026
SELL
Change
-7,662
Price
$8.47
Filing
07/30/2026
Type
SELL
Isaacs Michael John
Transaction: 07/28/2026
SELL
Change
-4,694
Price
$8.56
Filing
07/30/2026
Type
SELL
| Insider | Type | Change | Price | Transaction | Filing |
|---|---|---|---|---|---|
| Isaacs Michael John | SELL | -8,386 | $8.47 | 07/29/2026 | 07/30/2026 |
| Kingston Anne Evans | SELL | -7,662 | $8.47 | 07/29/2026 | 07/30/2026 |
| Isaacs Michael John | SELL | -4,694 | $8.56 | 07/28/2026 | 07/30/2026 |
| Kingston Anne Evans | SELL | -3,498 | $8.56 | 07/28/2026 | 07/30/2026 |
| Kinney Gene G. | SELL | -84,000 | Not reported | 07/28/2026 | 07/30/2026 |
| Kinney Gene G. | SELL | -84,000 | $8.56 | 07/28/2026 | 07/30/2026 |
| Nguyen Tran | SELL | -57,000 | Not reported | 07/28/2026 | 07/30/2026 |
| Nguyen Tran | SELL | -57,000 | $8.56 | 07/28/2026 | 07/30/2026 |
| Smith Brandon S. | SELL | -78,000 | Not reported | 07/28/2026 | 07/30/2026 |
| Smith Brandon S. | SELL | -78,000 | $8.56 | 07/28/2026 | 07/30/2026 |
| Swanson Chad J. | SELL | -51,000 | Not reported | 07/28/2026 | 07/30/2026 |
| Swanson Chad J. | SELL | -3,467 | $8.56 | 07/28/2026 | 07/30/2026 |
| Walker Karin L | SELL | -15,000 | Not reported | 07/28/2026 | 07/30/2026 |
| Walker Karin L | SELL | -15,000 | $8.56 | 07/28/2026 | 07/30/2026 |
| Zago Wagner M. | SELL | -51,000 | Not reported | 07/28/2026 | 07/30/2026 |
| Zago Wagner M. | SELL | -51,000 | $8.56 | 07/28/2026 | 07/30/2026 |
| SCULLY WILLIAM P | BUY | +20,000 | $7.90 | 06/16/2026 | 06/18/2026 |
| SCULLY WILLIAM P | SELL | -325,000 | Not reported | 06/15/2026 | 06/16/2026 |
| SCULLY WILLIAM P | BUY | +125,000 | $8.17 | 06/11/2026 | 06/12/2026 |
| Isaacs Michael John | OTHER | +50,000 | $10.50 | 06/08/2026 | 06/12/2026 |