PRTA
NASDAQ
IE
Prothena Corporation plc - Ordinary Shares
$9.86
▼ $-0.17
(-1.69%)
Vol 849K
3
Quality Score
fail
Rev ✗
NI ✗
>IPO ✗
Mkt Cap
$514.1M
ROE
-72.7%
Margin
-2379.6%
D/E
0.00
Beta
-0.16
52W
$4–$17
Wall Street Consensus
12 analysts · Apr 20262
Strong Buy
6
Buy
3
Hold
1
Sell
0
Strong Sell
66.7%
Buy Rating
Price Chart
Earnings
Beat rate: 50.0%
Next Report
May 06, 2026
EPS Estimate: $-0.36
| Quarter | EPS Est | EPS Act | Surprise |
|---|---|---|---|
| Mar 2026 | $-0.36 | — | — |
| Dec 2025 | $-0.57 | $-0.40 | +$0.17 |
| Sep 2025 | $-0.70 | $-0.68 | +$0.02 |
| Jun 2025 | $-1.34 | $-1.73 | $-0.39 |
Fundamentals Trend
| Metric | 2025-06-30 | 2025-09-02 | 2025-10-02 | 2025-11-03 | 2025-12-03 | 2026-01-02 |
|---|---|---|---|---|---|---|
| ROE (TTM) | -68.0% | -68.0% | -68.0% | -68.0% | -72.7% | -72.7% |
| P/E (TTM) | — | — | — | — | — | — |
| Net Margin | -2845.4% | -2929.3% | -2929.3% | -2929.3% | -2379.6% | -2379.6% |
| Gross Margin | — | — | — | — | — | — |
| D/E Ratio | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Current Ratio | 5.68 | 5.68 | 5.68 | 5.68 | 6.61 | 6.61 |
Key Ratios
ROA (TTM)
-62.5%
P/S (TTM)
43.62
P/B
1.5
EPS (TTM)
$-5.21
CF/Share
$-1.36
Rev Growth 3Y
-12.3%
52W High
$16.67
52W Low
$4.32
$4.32
52-Week Range
$16.67
How does PRTA compare to Biotechnology peers?
Peer group: Micro-cap Biotechnology (All) · 528 companies
PRTA valuation vs Biotechnology peers
P/E ratio
—
▼
0%
below
peers
(18.8)
vs Peers
vs Industry
Undervalued
P/S ratio
43.6
▲
239%
above
peers
(12.9)
vs Peers
vs Industry
Pricier
P/B ratio
1.5
▼
38%
below
peers
(2.5)
vs Peers
vs Industry
Pricier
Div yield
—
▼
0%
below
peers
(0.0%)
vs Peers
vs Industry
Low yield
PRTA profitability vs Biotechnology peers
ROE
-72.7%
▼
8%
below
peers
(-67.3%)
vs Peers
vs Industry
In line
Net margin
-2379.6%
▼
730%
below
peers
(-286.8%)
vs Peers
vs Industry
Weak
Gross margin
—
▼
0%
below
peers
(78.6%)
vs Peers
vs Industry
In line
ROA
-62.5%
▼
34%
below
peers
(-46.7%)
vs Peers
vs Industry
Weak
PRTA financial health vs Biotechnology peers
D/E ratio
0.0
▼
0%
below
peers
(0.0)
vs Peers
vs Industry
Low debt
Current ratio
6.6
▲
49%
above
peers
(4.4)
vs Peers
vs Industry
Below avg
Beta
-0.2
▼
117%
below
peers
(1.0)
vs Peers
vs Industry
More volatile
PRTA fundamentals radar
PRTA
Peer median
Industry
PRTA profitability vs leverage
Bubble size = market cap · X = net margin · Y = D/E ratio
PRTA vs peers: key metrics
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