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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) · TTM
0100M200M300M24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Revenue (USD) · TTM by quarter
PeriodRevenue (USD) · TTM
26 Q254.53M
26 Q157.94M
25 Q49.68M
25 Q311.79M
25 Q210.34M
25 Q1137.94M
24 Q4135.16M
24 Q3133.35M
24 Q2217.25M
24 Q189.25M
Net Income (USD) · TTM
-400M-300M-200M-100M024 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Net Income (USD) · TTM by quarter
PeriodNet Income (USD) · TTM
26 Q2-43.99M
26 Q1-151.18M
25 Q4-244.09M
25 Q3-280.46M
25 Q2-302.92M
25 Q1-110.27M
24 Q4-122.31M
24 Q3-131.83M
24 Q2-50.92M
24 Q1-172.4M
Operating Income (USD) · TTM
-300M-200M-100M024 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Operating Income (USD) · TTM by quarter
PeriodOperating Income (USD) · TTM
26 Q2-62.76M
26 Q1-126.28M
25 Q4-217.65M
25 Q3-255.33M
25 Q2-281.61M
25 Q1-138.61M
24 Q4-154.56M
24 Q3-168.18M
24 Q2-91.36M
24 Q1-216.24M
EBITDA (USD) · TTM
-300M-200M-100M024 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA EBITDA (USD) · TTM by quarter
PeriodEBITDA (USD) · TTM
26 Q2-41.14M
26 Q1-74.72M
25 Q4-169.51M
25 Q3-208.15M
25 Q2-231.82M
25 Q1-114.96M
24 Q4-128.04M
24 Q3-132.82M
24 Q2-47.98M
24 Q1-163.12M
Cash Flows (USD) · TTM
-200M-150M-100M-50M024 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Cash Flows (USD) · TTM by quarter
PeriodCash Flows (USD) · TTM
26 Q2-60.71M
26 Q1-81.44M
25 Q4-163.72M
25 Q3-188.22M
25 Q2-192.84M
25 Q1-130.6M
24 Q4-150.35M
24 Q3-155.12M
24 Q2-100.85M
24 Q1-162.36M
EPS (USD) · TTM
-6-4-2024 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA EPS (USD) · TTM by quarter
PeriodEPS (USD) · TTM
26 Q2-0.84
26 Q1-2.82
25 Q4-4.54
25 Q3-5.22
25 Q2-5.64
25 Q1-2.08
24 Q4-2.3
24 Q3-2.48
24 Q2-1
24 Q1-3.25
Expenses (USD) · TTM
0100M200M300M400MR&DSG&ACapex24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Expenses (USD) · TTM by quarter
PeriodExpenses (USD) · TTM
26 Q2115.06M
26 Q1151.22M
25 Q4194.38M
25 Q3234.21M
25 Q2259.52M
25 Q1276.79M
24 Q4290.02M
24 Q3303.33M
24 Q2310.84M
24 Q1308.36M
Shares Outstanding (USD) · TTM
-60M-40M-20M020M40MBuybacks (Repurchases)Stock-Based Compensation24 Q124 Q224 Q324 Q425 Q125 Q225 Q325 Q426 Q126 Q2
PRTA Shares Outstanding (USD) · TTM by quarter
PeriodShares Outstanding (USD) · TTM
26 Q2-6.54M
26 Q1-26.57M
25 Q4-37.5M
25 Q3-40.89M
25 Q2-44.63M
25 Q1-44.18M
24 Q4-45.61M
24 Q3-46.23M
24 Q2-46.25M
24 Q1-44.45M
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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