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Prothena Corporation plc

$8.93 -$0.27 (-2.93%)
NASDAQ · 11 Sep 2026 20:00 UTC
Previous Close
$9.02
Day Range
$8.77$9.11
Year Range
$7.73$11.8
Market Cap
467.51M
AVG Volume
513.98K
Trailing/Forward PE
-10.76/-
PEG ratio
0.01
Dividend Yield
-
Next Earnings Date
2026-11-05
Primary Exchange
NASDAQUS
Revenue (USD)
050M100M150M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Revenue (USD) by quarter
PeriodRevenue (USD)
26 Q21.01M
26 Q151.08M
25 Q421K
25 Q32.42M
25 Q24.42M
25 Q12.83M
24 Q42.12M
24 Q3970K
24 Q2132.01M
24 Q150K
Net Income (USD)
-150M-100M-50M050M100M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Net Income (USD) by quarter
PeriodNet Income (USD)
26 Q2-18.58M
26 Q132.72M
25 Q4-21.59M
25 Q3-36.54M
25 Q2-125.77M
25 Q1-60.2M
24 Q4-57.96M
24 Q3-59M
24 Q266.89M
24 Q1-72.24M
Operating Income (USD)
-100M-50M050M100M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Operating Income (USD) by quarter
PeriodOperating Income (USD)
26 Q2-21.1M
26 Q125.79M
25 Q4-27.21M
25 Q3-40.24M
25 Q2-84.62M
25 Q1-65.58M
24 Q4-64.9M
24 Q3-66.51M
24 Q258.38M
24 Q1-81.53M
EBITDA (USD)
-100M-50M050M100M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA EBITDA (USD) by quarter
PeriodEBITDA (USD)
26 Q2-18.2M
26 Q133.64M
25 Q4-20.64M
25 Q3-35.94M
25 Q2-51.78M
25 Q1-61.15M
24 Q4-59.28M
24 Q3-59.61M
24 Q265.08M
24 Q1-74.22M
Cash Flows (USD)
-100M-50M050M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Cash Flows (USD) by quarter
PeriodCash Flows (USD)
26 Q2-25.7M
26 Q128.88M
25 Q4-23.31M
25 Q3-40.58M
25 Q2-46.43M
25 Q1-53.41M
24 Q4-47.81M
24 Q3-45.2M
24 Q215.82M
24 Q1-73.15M
EPS (USD)
-3-2-101224 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA EPS (USD) by quarter
PeriodEPS (USD)
26 Q2-0.36
26 Q10.6
25 Q4-0.4
25 Q3-0.68
25 Q2-2.34
25 Q1-1.12
24 Q4-1.08
24 Q3-1.1
24 Q21.22
24 Q1-1.34
Expenses (USD)
025M50M75M100MR&DSG&ACapex24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Expenses (USD) by quarter
PeriodExpenses (USD)
26 Q220.35M
26 Q125.29M
25 Q427.23M
25 Q342.19M
25 Q256.51M
25 Q168.45M
24 Q467.06M
24 Q367.49M
24 Q273.78M
24 Q181.68M
Cash & Debt (USD)
0200M400M600MCashLong Term DebtShort Term Debt24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Cash & Debt (USD) by quarter
PeriodCash & Debt (USD)
26 Q2288.19M
26 Q1329.46M
25 Q4307.53M
25 Q3330.84M
25 Q2371.44M
25 Q1417.94M
24 Q4471.39M
24 Q3519.26M
24 Q2564.12M
24 Q1546.51M
Debt ratios
05101524 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Debt ratios by quarter
PeriodDebt ratios
26 Q26.84
26 Q14.31
25 Q41.73
25 Q31.55
25 Q21.56
25 Q13.55
24 Q43.6
24 Q33.82
24 Q211.51
24 Q13.27
Margins
-6000%-4000%-2000%0%2000%24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Margins by quarter
PeriodMargins
26 Q2100%
26 Q198.2%
25 Q4-4385.71%
25 Q3-1098.26%
25 Q2100%
25 Q1100%
24 Q4100%
24 Q3100%
24 Q2100%
24 Q1100%
Return on Capital
-40%-20%0%20%24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Return on Capital by quarter
PeriodReturn on Capital
26 Q2-6.48%
26 Q110.47%
25 Q4-7.7%
25 Q3-12.39%
25 Q2-38.78%
25 Q1-13.75%
24 Q4-11.9%
24 Q3-11.04%
24 Q211.49%
24 Q1-14.38%
Shares Outstanding
020M40M60M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Shares Outstanding by quarter
PeriodShares Outstanding
26 Q252.15M
26 Q153.71M
25 Q453.83M
25 Q353.83M
25 Q253.83M
25 Q153.83M
24 Q453.81M
24 Q353.79M
24 Q253.77M
24 Q153.71M
Book Value Per Share (USD)
05101524 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Book Value Per Share (USD) by quarter
PeriodBook Value Per Share (USD)
26 Q25.5
26 Q15.82
25 Q45.21
25 Q35.48
25 Q26.03
25 Q18.13
24 Q49.05
24 Q39.93
24 Q210.82
24 Q19.35
Total Assets (USD)
0200M400M600M800M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Total Assets (USD) by quarter
PeriodTotal Assets (USD)
26 Q2302.58M
26 Q1349.89M
25 Q4326.8M
25 Q3352.63M
25 Q2399.07M
25 Q1495.34M
24 Q4547.11M
24 Q3595.25M
24 Q2645.57M
24 Q1623.19M
Employee Count
0501001502002016201720182019202020212022202320242025
PRTA Employee Count by quarter
PeriodEmployee Count
202567
2024163
2023173
2022127
202182
202066
201951
201859
2017125
201696
PE Ratio
10203040med 23.17Nov 21Jan 22Feb 22Apr 22May 22Jun 22Aug 22
PRTA PE Ratio by quarter
PeriodPE Ratio
Aug 2222.85
Jul 2221.43
Jul 2221.4
Jul 2221.19
Jul 2221.73
Jul 2219.25
Jun 2219.16
Jun 2216.47
Jun 2216.97
Jun 2218.98
May 2219.45
May 2218.69
May 2218.15
May 2220.56
Apr 2220.3
Apr 2223.2
Apr 2225.16
Apr 2225.44
Apr 2227.19
Mar 2225.72
Mar 2227.26
Mar 2223.28
Mar 2221.3
Feb 2224.58
Feb 2222.12
Feb 2223.33
Feb 2222.16
Jan 2221.48
Jan 2223.15
Jan 2225.97
Jan 2227.06
Dec 2132.46
Dec 2131.8
Dec 2130.88
Dec 2128.71
Dec 2130.61
Nov 2132.3
Nov 2138.59
Nov 2137.58
Nov 2138.73
Free Cash Flow Yield
-60%-40%-20%0%med -29.67%Dec 24Apr 25Jul 25Oct 25Feb 26May 26Sep 26
PRTA Free Cash Flow Yield by quarter
PeriodFree Cash Flow Yield
Sep 26-13.04%
Sep 26-11.86%
Aug 26-12.48%
Aug 26-12.32%
Aug 26-13.14%
Aug 26-13.29%
Jul 26-18.67%
Jul 26-17.33%
Jul 26-17.51%
Jul 26-16.41%
Jul 26-15.65%
Jun 26-15.13%
Jun 26-16.98%
Jun 26-18.38%
Jun 26-17.25%
May 26-14.89%
May 26-15.42%
May 26-15.54%
May 26-14.13%
May 26-28.58%
Apr 26-28.29%
Apr 26-27.9%
Apr 26-28.97%
Apr 26-30.85%
Mar 26-32.84%
Mar 26-34.76%
Mar 26-33.02%
Mar 26-31.71%
Feb 26-35.08%
Feb 26-38.76%
Feb 26-39.02%
Feb 26-39.24%
Jan 26-39.69%
Jan 26-34.97%
Jan 26-37.4%
Jan 26-38.05%
Jan 26-38.01%
Dec 25-36.65%
Dec 25-37.97%
Dec 25-33.75%
Dec 25-31.59%
Nov 25-32.53%
Nov 25-33.36%
Nov 25-35.21%
Nov 25-33.11%
Oct 25-33.33%
Oct 25-36.48%
Oct 25-36.11%
Oct 25-35.65%
Oct 25-36.11%
Sep 25-38.07%
Sep 25-44.39%
Sep 25-43.64%
Sep 25-41.9%
Aug 25-43.69%
Aug 25-40.85%
Aug 25-43.43%
Aug 25-46.59%
Aug 25-35.63%
Jul 25-36.32%
Jul 25-38.76%
Jul 25-37.91%
Jul 25-37.68%
Jun 25-39.91%
Jun 25-42.42%
Jun 25-47.76%
Jun 25-44.85%
May 25-52.86%
May 25-36.87%
May 25-33.79%
May 25-32.66%
May 25-32.87%
Apr 25-28.8%
Apr 25-30.37%
Apr 25-27.34%
Apr 25-25.73%
Mar 25-21.26%
Mar 25-21.54%
Mar 25-20.33%
Mar 25-18.3%
Feb 25-17.67%
Feb 25-18.53%
Feb 25-20.35%
Feb 25-20.53%
Jan 25-20.27%
Jan 25-18.46%
Jan 25-20.94%
Jan 25-22.1%
Jan 25-20.79%
Dec 24-19.05%
Dec 24-18.95%
Dec 24-22.55%
Dec 24-20.53%
Nov 24-17.79%
Nov 24-19.75%
Nov 24-20.58%
Nov 24-10.6%
Nov 24-11.27%
Oct 24-12.26%
Oct 24-10.96%
Price to Sales
020406080med 8.51Dec 24Apr 25Jul 25Oct 25Feb 26May 26Sep 26
PRTA Price to Sales by quarter
PeriodPrice to Sales
Sep 268.54
Sep 269.39
Aug 268.92
Aug 269.04
Aug 268.47
Aug 268.38
Jul 267.53
Jul 268.11
Jul 268.03
Jul 268.57
Jul 268.98
Jun 269.29
Jun 268.28
Jun 267.65
Jun 268.15
May 269.44
May 269.11
May 269.05
May 269.95
May 2659.15
Apr 2659.76
Apr 2660.59
Apr 2658.37
Apr 2654.81
Mar 2651.47
Mar 2648.64
Mar 2651.2
Mar 2653.31
Feb 2648.19
Feb 2641.2
Feb 2640.92
Feb 2640.69
Jan 2640.24
Jan 2645.67
Jan 2642.7
Jan 2641.97
Jan 2642.02
Dec 2543.57
Dec 2542.06
Dec 2547.32
Dec 2550.56
Nov 2549.1
Nov 2547.87
Nov 2545.35
Nov 2548.23
Oct 2555.96
Oct 2551.12
Oct 2551.64
Oct 2552.31
Oct 2551.64
Sep 2548.98
Sep 2542.01
Sep 2542.73
Sep 2544.5
Aug 2542.68
Aug 2545.65
Aug 2542.94
Aug 2540.03
Aug 252.66
Jul 252.61
Jul 252.44
Jul 252.5
Jul 252.51
Jun 252.37
Jun 252.23
Jun 251.98
Jun 252.11
May 251.79
May 252.57
May 252.8
May 252.9
May 253.38
Apr 253.86
Apr 253.66
Apr 254.07
Apr 254.32
Mar 255.23
Mar 255.16
Mar 255.47
Mar 256.08
Feb 256.3
Feb 256.28
Feb 255.72
Feb 255.67
Jan 255.74
Jan 256.3
Jan 255.55
Jan 255.26
Jan 255.59
Dec 246.11
Dec 246.14
Dec 245.16
Dec 245.67
Nov 246.54
Nov 245.89
Nov 245.65
Nov 244.38
Nov 244.12
Oct 243.79
Oct 244.23
EV/EBITDA
02505007501000med 15.68Nov 21Jan 22Mar 22May 22Jul 22Sep 22Oct 22
PRTA EV/EBITDA by quarter
PeriodEV/EBITDA
Oct 22945.53
Oct 22871.83
Oct 22810.04
Oct 22835.53
Sep 22916.01
Sep 22368.03
Sep 22344.19
Sep 22337.04
Sep 22297.81
Aug 22317.43
Aug 22361.98
Aug 22394.61
Aug 2214.31
Jul 2212.96
Jul 2212.92
Jul 2212.72
Jul 2213.24
Jul 2210.86
Jun 2210.78
Jun 228.21
Jun 228.68
Jun 2210.6
May 2211.06
May 2210.33
May 229.81
May 2212.12
Apr 2210.84
Apr 2213.5
Apr 2215.3
Apr 2215.55
Apr 2217.16
Mar 2215.81
Mar 2217.22
Mar 2213.57
Mar 2211.76
Feb 2214.77
Feb 2212.5
Feb 2213.6
Feb 2212.53
Jan 2211.91
Jan 2213.43
Jan 2216.01
Jan 2217.01
Dec 2121.94
Dec 2121.33
Dec 2120.49
Dec 2118.52
Dec 2120.25
Nov 2121.79
Nov 2127.54
Nov 2126.61
Nov 2127.66
Price/Operating Cashflow
050100150200med 18.5Nov 21Jan 22Mar 22May 22Jul 22Sep 22Oct 22
PRTA Price/Operating Cashflow by quarter
PeriodPrice/Operating Cashflow
Oct 22171.62
Oct 22160.54
Oct 22151.25
Oct 22155.08
Sep 22167.18
Sep 2284.76
Sep 2281.18
Sep 2280.1
Sep 2274.2
Aug 2277.15
Aug 2283.85
Aug 2288.76
Aug 2217.34
Jul 2216.26
Jul 2216.24
Jul 2216.08
Jul 2216.49
Jul 2214.6
Jun 2214.54
Jun 2212.5
Jun 2212.88
Jun 2214.4
May 2214.76
May 2214.18
May 2213.77
May 2215.6
Apr 2214.68
Apr 2216.78
Apr 2218.2
Apr 2218.4
Apr 2219.66
Mar 2218.6
Mar 2219.71
Mar 2216.83
Mar 2215.4
Feb 2217.78
Feb 2216.01
Feb 2216.88
Feb 2216.03
Jan 2215.54
Jan 2216.75
Jan 2218.79
Jan 2219.58
Dec 2123.49
Dec 2123.01
Dec 2122.34
Dec 2120.78
Dec 2122.15
Nov 2123.37
Nov 2127.92
Nov 2127.19
Nov 2128.02
Price to Book
0.511.522.5med 1.57Dec 24Apr 25Jul 25Oct 25Feb 26May 26Sep 26
PRTA Price to Book by quarter
PeriodPrice to Book
Sep 261.62
Sep 261.78
Aug 261.7
Aug 261.72
Aug 261.61
Aug 261.59
Jul 261.4
Jul 261.5
Jul 261.49
Jul 261.59
Jul 261.66
Jun 261.72
Jun 261.53
Jun 261.42
Jun 261.51
May 261.75
May 261.69
May 261.68
May 261.84
May 262.04
Apr 262.06
Apr 262.09
Apr 262.02
Apr 261.89
Mar 261.78
Mar 261.68
Mar 261.77
Mar 261.84
Feb 261.66
Feb 261.65
Feb 261.64
Feb 261.63
Jan 261.61
Jan 261.82
Jan 261.71
Jan 261.68
Jan 261.68
Dec 251.74
Dec 251.68
Dec 251.89
Dec 252.02
Nov 251.96
Nov 251.91
Nov 251.81
Nov 251.93
Oct 251.78
Oct 251.63
Oct 251.65
Oct 251.67
Oct 251.65
Sep 251.56
Sep 251.34
Sep 251.36
Sep 251.42
Aug 251.36
Aug 251.46
Aug 251.37
Aug 251.28
Aug 250.84
Jul 250.82
Jul 250.77
Jul 250.79
Jul 250.79
Jun 250.75
Jun 250.7
Jun 250.62
Jun 250.67
May 250.56
May 250.81
May 250.88
May 250.91
May 250.94
Apr 251.07
Apr 251.02
Apr 251.13
Apr 251.2
Mar 251.45
Mar 251.43
Mar 251.52
Mar 251.69
Feb 251.75
Feb 251.57
Feb 251.43
Feb 251.41
Jan 251.43
Jan 251.57
Jan 251.39
Jan 251.31
Jan 251.4
Dec 241.52
Dec 241.53
Dec 241.29
Dec 241.41
Nov 241.63
Nov 241.47
Nov 241.41
Nov 241.64
Nov 241.54
Oct 241.41
Oct 241.58
Prothena Corporation plc
PRTA
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News: PRTA

Prothena to Participate in the H.C. Wainwright 28th Annual Global Investment Conference

businesswire.com · 9 Sep 2026

Prothena to Participate in the H.C. Wainwright 28th Annual Global Investment Conference

DUBLIN, Ireland--(BUSINESS WIRE)---- $PRTA #Prothena--Prothena to Participate in the H.C. Wainwright 28th Annual Global Investment Conference.

KMDA or PRTA: Which Is the Better Value Stock Right Now?

zacks.com · 14 Aug 2026

KMDA or PRTA: Which Is the Better Value Stock Right Now?

Investors interested in Medical - Biomedical and Genetics stocks are likely familiar with Kamada (KMDA) and Prothena (PRTA). But which of these two companies is the best option for those looking for undervalued stocks?

PRTA's Q2 Loss Narrower Than Expected, Pipeline Progress in Focus

zacks.com · 7 Aug 2026

PRTA's Q2 Loss Narrower Than Expected, Pipeline Progress in Focus

Prothena beat adjusted Q2 loss estimates, reaffirmed 2026 cash-use guidance and highlights partner pipeline progress as a key milestone decision nears.

Prothena (PRTA) Reports Q2 Loss, Misses Revenue Estimates

zacks.com · 6 Aug 2026

Prothena (PRTA) Reports Q2 Loss, Misses Revenue Estimates

Prothena (PRTA) came out with a quarterly loss of $0.32 per share versus the Zacks Consensus Estimate of a loss of $0.39. This compares to a loss of $1.86 per share a year ago.

Prothena Reports Second Quarter 2026 Financial Results and Business Highlights

businesswire.com · 6 Aug 2026

Prothena Reports Second Quarter 2026 Financial Results and Business Highlights

DUBLIN--(BUSINESS WIRE)---- $PRTA #Prothena--Prothena reported financial results for the second quarter and first six months of 2026 and provided business highlights.

Prothena (NASDAQ:PRTA) Share Price Passes Below 200-Day Moving Average   – Time to Sell?

defenseworld.net · 22 Jul 2026

Prothena (NASDAQ:PRTA) Share Price Passes Below 200-Day Moving Average – Time to Sell?

Shares of Prothena Corporation plc (NASDAQ: PRTA - Get Free Report) passed below its 200-day moving average during trading on Tuesday. The stock has a 200-day moving average of $9.46 and traded as low as $8.51. Prothena shares last traded at $8.75, with a volume of 647,643 shares trading hands. Wall Street Analyst Weigh In

PRTA Stock Rises Nearly 11% in Six Months: What's Driving It?

zacks.com · 9 Jul 2026

PRTA Stock Rises Nearly 11% in Six Months: What's Driving It?

Prothena shares climb as late-stage partnered programs advance, milestone payments strengthen finances and its neurodegenerative pipeline continues to expand.

SRPT or PRTA: Which Is the Better Value Stock Right Now?

zacks.com · 24 Jun 2026

SRPT or PRTA: Which Is the Better Value Stock Right Now?

Investors interested in Medical - Biomedical and Genetics stocks are likely familiar with Sarepta Therapeutics (SRPT) and Prothena (PRTA). But which of these two stocks is more attractive to value investors?

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Disclaimer: The historical data presented on this platform is provided by Financial Modeling Prep. Stock Picker is a platform for informational purposes only and does not provide financial advice. Users are encouraged to conduct their own research and consult with a qualified financial advisor before making investment decisions.