Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
8.16
-0.07 (-0.85%)
At close: Nov 13, 2026, 4:00 PM EST
8.16
0.00 (0.00%)
After-hours: Nov 13, 2026, 7:45 PM EST

Prothena Corporation Statistics

Total Valuation

PRTA has a market cap or net worth of $419.01 million. The enterprise value is $153.90 million.

Market Cap419.01M
Enterprise Value 153.90M

Important Dates

The last earnings date was Thursday, November 5, 2026, after market close.

Earnings Date Nov 5, 2026
Ex-Dividend Date n/a

Share Statistics

PRTA has 51.35 million shares outstanding. The number of shares has decreased by -1.95% in one year.

Current Share Class 51.35M
Shares Outstanding 51.35M
Shares Change (YoY) -1.95%
Shares Change (QoQ) -1.36%
Owned by Insiders (%) 23.68%
Owned by Institutions (%) 81.66%
Float 34.19M

Valuation Ratios

PE Ratio n/a
Forward PE n/a
PS Ratio 7.95
Forward PS 12.08
PB Ratio 1.56
P/TBV Ratio 1.56
P/FCF Ratio n/a
P/OCF Ratio n/a
PEG Ratio n/a
Financial Ratio History

Enterprise Valuation

EV / Earnings n/a
EV / Sales 2.92
EV / EBITDA n/a
EV / EBIT n/a
EV / FCF n/a

Financial Position

The company has a current ratio of 23.95, with a Debt / Equity ratio of 0.02.

Current Ratio 23.95
Quick Ratio 23.73
Debt / Equity 0.02
Debt / EBITDA n/a
Debt / FCF n/a
Interest Coverage n/a

Financial Efficiency

Return on equity (ROE) is -8.50% and return on invested capital (ROIC) is -8.31%.

Return on Equity (ROE) -8.50%
Return on Assets (ROA) -7.57%
Return on Invested Capital (ROIC) -8.31%
Return on Capital Employed (ROCE) -14.15%
Weighted Average Cost of Capital (WACC) 3.04%
Revenue Per Employee $787,090
Profits Per Employee -$357,612
Employee Count67
Asset Turnover 0.17
Inventory Turnover n/a

Taxes

In the past 12 months, PRTA has paid $15,000 in taxes.

Income Tax 15,000
Effective Tax Rate n/a

Stock Price Statistics

The stock price has decreased by -24.79% in the last 52 weeks. The beta is -0.21, so PRTA's price volatility has been lower than the market average.

Beta (5Y) -0.21
52-Week Price Change -24.79%
50-Day Moving Average 8.54
200-Day Moving Average 9.17
Relative Strength Index (RSI) 45.76
Average Volume (20 Days) 451,466

Short Selling Information

The latest short interest is 7.91 million, so 15.41% of the outstanding shares have been sold short.

Short Interest 7.91M
Short Previous Month 7.94M
Short % of Shares Out 15.41%
Short % of Float 23.14%
Short Ratio (days to cover) 14.09

Income Statement

In the last 12 months, PRTA had revenue of $52.74 million and -$23.96 million in losses. Loss per share was -$0.45.

Revenue52.74M
Gross Profit 8.30M
Operating Income -38.51M
Pretax Income -23.95M
Net Income -23.96M
EBITDA -37.70M
EBIT -38.51M
Loss Per Share -$0.45
Full Income Statement

Balance Sheet

The company has $271.37 million in cash and $6.26 million in debt, with a net cash position of $265.11 million or $5.16 per share.

Cash & Cash Equivalents 271.37M
Total Debt 6.26M
Net Cash 265.11M
Net Cash Per Share $5.16
Equity (Book Value) 268.84M
Book Value Per Share 5.24
Working Capital 262.43M
Full Balance Sheet

Cash Flow

In the last 12 months, operating cash flow was -$31.45 million and capital expenditures -$725,000, giving a free cash flow of -$32.17 million.

Operating Cash Flow -31.45M
Capital Expenditures -725,000
Depreciation & Amortization 808,000
Net Borrowing n/a
Free Cash Flow -32.17M
FCF Per Share -$0.63
Full Cash Flow Statement

Margins

Gross margin is 15.73%, with operating and profit margins of -73.02% and -45.43%.

Gross Margin 15.73%
Operating Margin -73.02%
Pretax Margin -45.41%
Profit Margin -45.43%
EBITDA Margin -71.49%
EBIT Margin -73.02%
FCF Margin n/a

Dividends & Yields

PRTA does not appear to pay any dividends at this time.

Dividend Per Share n/a
Dividend Yield n/a
Dividend Growth (YoY) n/a
Years of Dividend Growth n/a
Payout Ratio n/a
FCF Payout Ratio n/a
Buyback Yield 1.95%
Shareholder Yield 1.95%
Earnings Yield -5.56%
FCF Yield -7.68%

Analyst Forecast

The average price target for PRTA is $21.40, which is 162.26% higher than the current price. The consensus rating is "Buy".

Price Target $21.40
Price Target Difference 162.26%
Analyst Consensus Buy
Analyst Count 7
Revenue Growth Forecast (3Y) 102.88%
EPS Growth Forecast (3Y) n/a
Stock Forecasts

Fair Value

There are several formulas that can be used to estimate the intrinsic value of a stock.

Lynch Fair Value n/a
Lynch Upside n/a
Graham Number n/a
Graham Upside n/a
Graham Formula Value n/a
Graham Formula Upside n/a

Stock Splits

This stock does not have any record of stock splits.

Last Split Date n/a
Split Type n/a
Split Ratio n/a

Scores

PRTA has an Altman Z-Score of 14.89 and a Piotroski F-Score of 3.

Altman Z-Score 14.89
Piotroski F-Score 3