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Prothena Corporation plc

$8.98 -$0.22 (-2.39%)
NASDAQ · 14 Sep 2026 17:33 UTC
Previous Close
$8.93
Day Range
$8.79$9
Year Range
$7.73$11.8
Market Cap
470.13M
AVG Volume
513.98K
Trailing/Forward PE
-10.77/-
PEG ratio
0.01
Dividend Yield
-
Next Earnings Date
2026-11-05
Primary Exchange
NASDAQUS
Revenue (USD)
0100M200M300M2016201720182019202020212022202320242025
PRTA Revenue (USD) by year
PeriodRevenue (USD)
20259.68M
2024135.16M
202391.37M
202253.91M
2021200.58M
2020853K
2019814K
2018955K
201727.52M
20161.05M
Net Income (USD)
-300M-200M-100M0100M2016201720182019202020212022202320242025
PRTA Net Income (USD) by year
PeriodNet Income (USD)
2025-244.09M
2024-122.31M
2023-147.03M
2022-116.95M
202166.97M
2020-111.14M
2019-77.68M
2018-155.65M
2017-153.24M
2016-160.11M
Operating Income (USD)
-300M-200M-100M0100M2016201720182019202020212022202320242025
PRTA Operating Income (USD) by year
PeriodOperating Income (USD)
2025-217.65M
2024-154.56M
2023-191.04M
2022-131.56M
202171.97M
2020-112.73M
2019-85.7M
2018-158.85M
2017-155.25M
2016-159.53M
EBITDA (USD)
-200M-100M0100M2016201720182019202020212022202320242025
PRTA EBITDA (USD) by year
PeriodEBITDA (USD)
2025-169.51M
2024-128.04M
2023-132.65M
2022-107.55M
202173.1M
2020-111.22M
2019-78.28M
2018-152.83M
2017-152.19M
2016-156.38M
Cash Flows (USD)
-200M-100M0100M2016201720182019202020212022202320242025
PRTA Cash Flows (USD) by year
PeriodCash Flows (USD)
2025-163.72M
2024-150.35M
2023-136.72M
2022-109.28M
202192.03M
2020-80.56M
2019-53.52M
2018-30.04M
2017-134.81M
2016-133.91M
EPS (USD)
-6-4-2022016201720182019202020212022202320242025
PRTA EPS (USD) by year
PeriodEPS (USD)
2025-4.54
2024-2.3
2023-2.8
2022-2.51
20211.09
2020-2.79
2019-1.95
2018-3.94
2017-4.06
2016-4.66
Expenses (USD)
0100M200M300MR&DSG&ACapex2016201720182019202020212022202320242025
PRTA Expenses (USD) by year
PeriodExpenses (USD)
2025194.38M
2024290.02M
2023285.22M
2022185.93M
2021129.18M
2020113.99M
201987.13M
2018145.43M
2017186.4M
2016177.23M
Cash & Debt (USD)
0200M400M600M800MCashLong Term DebtShort Term Debt2016201720182019202020212022202320242025
PRTA Cash & Debt (USD) by year
PeriodCash & Debt (USD)
2025307.53M
2024471.39M
2023618.83M
2022710.41M
2021579.09M
2020295.38M
2019375.72M
2018427.66M
2017417.62M
2016386.92M
Debt ratios
0123420182019202020212022202320242025
PRTA Debt ratios by year
PeriodDebt ratios
20250.55
20241.56
20232.18
20223.14
20212.11
20200.56
20190.65
20180.7
Margins
-15000%-10000%-5000%0%5000%2016201720182019202020212022202320242025
PRTA Margins by year
PeriodMargins
2025-208.55%
2024100%
2023-141.4%
2022-151.48%
202158.98%
2020-8678.9%
2019-6145.21%
2018-10495.08%
2017-388.92%
2016-11230.24%
Return on Capital
-100%-50%0%50%2016201720182019202020212022202320242025
PRTA Return on Capital by year
PeriodReturn on Capital
2025-87.03%
2024-25.12%
2023-26.19%
2022-18.8%
202114.37%
2020-60.4%
2019-28.46%
2018-48.19%
2017-37.63%
2016-43.82%
Shares Outstanding
020M40M60M2016201720182019202020212022202320242025
PRTA Shares Outstanding by year
PeriodShares Outstanding
202553.83M
202453.81M
202353.67M
202248.96M
202146.62M
202039.92M
201939.9M
201839.86M
201738.45M
201634.6M
Book Value Per Share (USD)
0510152016201720182019202020212022202320242025
PRTA Book Value Per Share (USD) by year
PeriodBook Value Per Share (USD)
20255.21
20249.05
202310.46
202212.71
202110
20204.61
20196.84
20188.1
201710.59
201610.56
Total Assets (USD)
0200M400M600M800M2016201720182019202020212022202320242025
PRTA Total Assets (USD) by year
PeriodTotal Assets (USD)
2025326.8M
2024547.11M
2023696.38M
2022758.03M
2021609.37M
2020332.98M
2019419.27M
2018498.8M
2017496.33M
2016459.98M
Employee Count
0501001502002016201720182019202020212022202320242025
PRTA Employee Count by year
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 year
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 year
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 year
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 year
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 year
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 year
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.