Prothena Corporation plc (PRTA)

NASDAQ: PRTA · USD

$9.09

+0.28 (+3.2%)· Recorded snapshot

Market cap	466.7M
Revenue (ttm)	54.5M
Net income (ttm)	-44M
EPS (ttm)	-$0.83
Shares out	51.3M
Volume	611,455
Beta	-0.29

Market data

Price

Recent price action with selectable time range.

Financial snapshot

Revenue (ttm): 54.5M
Net income (ttm): -44M
EPS (ttm): -$0.83
Market cap: 466.7M

Ticker	Name	Market cap	P/E	P/S	ROIC	5Y rev CAGR	1Y total return	Rating
EXAS	Exact Sciences Corp	—	—	—	—	—	—	احتفاظ

Calendar

Next earnings

Upcoming earnings date and setup when available.

Upcoming

DateLoading

Window—

EPS estimate—

Revenue estimate—

Sector percentile context

Refreshed 2026-10-28 19:55 UTC

Forward P/En/a

P25 n/aP50 n/aP75 n/a

Trailing P/En/a

P25 n/aP50 n/aP75 n/a

ROE-14.4

P25 n/aP50 n/aP75 n/a

ROIC-11.9

P25 n/aP50 n/aP75 n/a

Benchmarks · 1M

All PRTA indicators

Market & fundamental data

Available fields

205

Groups with data

Currency

USD

Showing 205 of 205 available metrics for this ticker.

Profile and market data

Ticker identity, listing, currency, market cap, and source dates.

Metric	Value
Amount currency	USD
CIK code	0001559053
Company name	Prothena Corporation plc
Country	Ireland
Country code	US
Earnings date	2026-11-09
Earnings time	amc
Employees	67
Employees change	-96
Employees growth	-58.9%
Enterprise value	$185.5M
Exchange	NASDAQ
Financial currency	USD
Financial report date	2026-06-30
First seen	2026-05-09
Fiscal year end	December
Founded	2012
In index	RUSSELL2000
Industry	Biotechnology
Is primary listing	Yes
Is SPAC	No
ISIN number	IE00B91XRN20
Last 10-K release date	2026-02-27
Last earnings date	2026-08-06
Last refreshed	2026-10-28
Last stock split type	Never
Market cap	$466.7M
Market cap category	Small-Cap
Next earnings date	2026-11-09
Options	Yes
Price	$9.09
Price currency	USD
Sector	Healthcare
SIC code	2834
Stock price date	2026-10-28
Symbol	PRTA
Website	https://www.prothena.com

Valuation

Multiples, yields, enterprise-value ratios, and valuation checks.

Metric	Value
Earnings yield	-9.17%
EV/Sales	3.4x
FCF / EV yield	-32.74%
FCF yield	-13.01%
Forward EV/Sales	5.79x
Forward P/S	14.58x
P/B ratio	1.59x
P/S ratio	8.56x
Price / tangible book value	1.63x
Sector forward P/E	23.56x
Sector P/E	50.08x

Profitability

Margins, returns on capital, cash conversion, and quality metrics.

Metric	Value
EBIT margin	-109.79%
EBITDA margin	-108.27%
Gross margin	-19.11%
Operating margin	-109.79%
Pretax margin	-81.33%
Profit margin	-80.67%
Profit per employee	$-656,597
Revenue per employee	$813,881
ROA	-10.67%
ROA (5Y)	-12.17%
ROCE	-20.58%
ROE	-14.39%
ROE (5Y)	-22.54%
ROIC	-11.92%
SBC / revenue	53.3%
Tax / revenue	-0.66%

Growth

Revenue, earnings, cash-flow, and forward growth indicators.

Metric	Value
EPS growth quarters	4
EPS growth years	0
Net income growth quarters	4
Net income growth years	0
Revenue growth	427.32%
Revenue growth (Q)	-77.15%
Revenue growth (QoQ)	-98.02%
Revenue growth 10Y	44.93%
Revenue growth 3Y	-1.83%
Revenue growth 5Y	-2.14%
Revenue growth years	0

Financial statements

Income-statement and cash-flow amounts, totals and per share.

Metric	Value
Capital expenditures	$-662,000
Depreciation and amortization	$828,000
EBIT	$-59.9M
EBITDA	$-59M
EPS	$-0.83
FCF per share	$-1.18
Financing cash flow	$-22.5M
Free cash flow	$-60.7M
Free cash flow minus SBC	$-89.8M
Gross profit	$-10.4M
Income taxes	$-358,000
Investing cash flow	$-662,000
Net cash flow	$-83.2M
Net income	$-44M
Operating cash flow minus SBC	$-89.1M
Operating income	$-59.9M
Revenue	$54.5M
Stock-based compensation	$29.1M

Financial strength

Debt, cash, solvency, accounting-quality, and balance-sheet signals.

Metric	Value
Altman Z-Score	13.38
Book value per share	$5.54
Debt / equity	0.02
Long-term assets	$10.6M
Long-term liabilities	$4M
Net cash (debt)	$281.2M
Net cash / market cap	60.26%
Net cash growth	-22.25%
Net debt / equity	-0.98
Piotroski F-Score	3
Property, plant and equipment	$9.2M
Shareholders' equity	$286.9M
Tangible book value	$286.9M
Tangible book value per share	$5.54
Total assets	$302.6M
Total cash	$288.2M
Total debt	$7M
Total liabilities	$15.7M
WACC	2.6%

Liquidity

Current-asset coverage and working-capital efficiency metrics.

Metric	Value
Asset turnover	0.16
Current assets	$292M
Current liabilities	$11.7M
Current ratio	25.05
Net working capital	$-4.9M
Quick ratio	24.72
Working capital	$280.4M
Working capital turnover	0.18

Dividends and buybacks

Dividend yield, payout, buybacks, and shareholder-yield indicators.

Metric	Value
Buyback yield / dilution	0.82%
Dividend yield	0%
Shareholder yield	0.82%

Performance and technicals

Returns, volatility, beta, momentum, RSI, and moving-average context.

Metric	Value
10Y price change	-82.28%
10Y return CAGR	-15.89%
10Y total return	-82.28%
150-day SMA	$9.27
1D price change	3.18%
1M price change	9.65%
1M total return	9.65%
1W price change	13.2%
1W total return	13.2%
1Y price change	-12.34%
1Y return CAGR	-12.35%
1Y total return	-12.34%
20-day SMA	$8.45
200-day SMA	$9.24
3M price change	4.48%
3M total return	4.48%
3Y price change	-74.57%
3Y return CAGR	-36.64%
3Y total return	-74.57%
50-day SMA	$8.78
50-day SMA vs 200-day SMA	50under200
52-week high	$11.80
52-week high date	2026-05-08
52-week low	$7.73
52-week low date	2026-06-11
5Y price change	-83.38%
5Y return CAGR	-30.16%
5Y total return	-83.38%
6M price change	-15.76%
6M total return	-15.76%
All-time high	$79.75
All-time high date	2021-09-27
All-time low	$4.32
All-time low date	2025-05-28
Average true range (ATR)	$0.41
Average volume	563.5K
Beta (1Y)	0.8
Beta (2Y)	0.89
Beta (5Y)	-0.29
Change from 52-week high	-22.97%
Change from 52-week low	17.59%
Change from all-time high	-88.6%
Change from all-time low	110.42%
Change from open	5.57%
Day's gap	-2.27%
Dollar volume	$5.6M
High price	$9.22
Low price	$8.61
Monthly RSI	39.75
Open price	$8.61
Position in 52-week range	78.69%
Premarket change	-0.34%
Premarket close	$8.81
Premarket price	$8.78
Premarket volume	202
Previous close	$8.81
Price vs 150-day SMA	-1.94%
Price vs 20-day SMA	7.64%
Price vs 200-day SMA	-1.63%
Price vs 50-day SMA	3.5%
Relative volume	1.1
RSI	59.74
Sharpe ratio	-0.13
Sharpe ratio (3Y)	-0.54
Sharpe ratio (5Y)	-0.22
Sortino ratio	-0.06
Sortino ratio (3Y)	-0.66
Sortino ratio (5Y)	-0.27
Volume	611.5K
Weekly RSI	50.59
YTD price change	-4.82%
YTD total return	-4.82%

Ownership and float

Institutional, insider, float, short-interest, and share-count fields.

Metric	Value
Float	34M
Float percentage	66.16%
Shares change (QoQ)	-3.63%
Shares change (YoY)	-0.82%
Shares held by insiders	24.1%
Shares held by institutions	83.3%
Shares outstanding	51.3M
Short % of float	23.38%
Short % of shares	15.47%
Short ratio	17.6 days

Deeper analysis on PRTA

14 sections in the full report · jump straight to what you need

Forecast

Base and Bull forecast paths with report-date return framing.

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Valuation

Fair-value bridge, DCF, owner earnings, and peer multiples.

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Sensitivity

Cost-of-equity and terminal-growth stress table.

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Risks

Kill scenarios, soft-pass flags, and downside catalysts.

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Earnings

Next earnings setup and beat / inline / miss thresholds.

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Position sizing

Entry, exit, conviction, and quarterly monitoring rules.

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Financials

Revenue, margins, cash flow, and balance-sheet context.

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Peers

Relative valuation and profitability against the cohort.

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Moat

Economic-profit evidence and competitive advantage risk.

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Industry cycle

Sector phase, capital cycle, and secular tailwinds.

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Frequently asked questions

About this PRTA report

Is a complete PRTA research report available?

No complete published report is available for Prothena Corporation plc (PRTA) on this page. Market-directory data, when present, is not a substitute for a validated stock analysis.

Prothena Corporation plc (PRTA)

Price

Financial snapshot

Fair-value bridge

Latest news · PRTA

Valuation

Profitability

Balance sheet

Trading

Next earnings

Sector percentile context

All PRTA indicators

Profile and market data

Valuation

Profitability

Growth

Financial statements

Financial strength

Liquidity

Dividends and buybacks

Performance and technicals

Ownership and float

Deeper analysis on PRTA

Frequently asked questions