Market Cap 463.85M
Revenue (ttm) 9.68M
Net Income (ttm) -244.09M
EPS (ttm) N/A
PE Ratio 0.00
Forward PE 106.82
Profit Margin -2,521.59%
Debt to Equity Ratio 0.00
Volume 312,600
Avg Vol 565,860
Day's Range N/A - N/A
Shares Out 52.35M
Stochastic %K 62%
Beta -0.30
Analysts Sell
Price Target $19.50

Company Profile

Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation. Its product pipeline includes Prasinezumab, an investigational humanized monoclonal antibody which is in Phase 3 clinical trial for the treatment of parkinson's disease and other synucleinopathies. The company also develops Coramitug, an investigational antibody, which is in Phase 3 clinical trial for the treatment of tr...

Industry: Biotechnology
Sector: Healthcare
Phone: 353 1 236 2500
Fax: 353 1 902 3510
Address:
77 Sir John Rogerson’s Quay, Block C Grand Canal Docklands, Dublin, Ireland
Quantumup
Quantumup Aug. 14 at 10:35 AM
Citizens reiterated $IMMX Market Outperform-$23 and said that it sees 273% pot'l⬆️for its bull case ($42) and 47% pot'l⬇️for its bear case ($6). $PRTA $JNJ - GMAB BMY GILD - ACLX AZN ABBV REGN Citizens said -- We reiterate our Market Outperform rating and price target of $23 for Immix Biopharma based on a revenue and earnings multiples analysis. Recently, Immix reported 2Q26 earnings, and based on our conversation with management, we remain confident in regard to the cadence of value-driving milestones over the next 6-12 months. With NXC-201 on track to report top-line results in September and file a BLA in 1H27, a potential commercial launch by year-end 2026/early 2027, and a solid cash position of $232.1MM, we believe Immix shares represent an attractive investment opportunity, with ~47% potential downside (bear case $6) and ~273% potential upside (bull case $42).
0 · Reply
AIIAAIIA_88
AIIAAIIA_88 Aug. 13 at 7:15 PM
$ACIU $PRTA $AVXL Will this one be the winner on the AD/PD field? This field has been a graveyard for so many drug candidates…. I have 3-5-7 year horizon with my position with this one just established.
0 · Reply
buyandsold
buyandsold Aug. 10 at 10:51 PM
$PRTA Did they ever do any of the buyback that they have allocated?
0 · Reply
FilingTracker
FilingTracker Aug. 10 at 7:26 PM
$PRTA Insider purchase by 10% owner: https://filingtracker.ai/filing/1559053/0001045463-26-000010
0 · Reply
Quantumup
Quantumup Aug. 10 at 11:11 AM
H.C. Wainwright⬆️ $IMMX's PT to $25, reiterated Buy and said -- For 2Q26, Immix reported a net loss of $0.18 per share vs. our prior estimate of a net loss of $0.15 per share. $PRTA $JNJ - GMAB AZN ABBV REGN H.C. Wainwright added—R&D and SG&A expenses were $5.3M and $7.1M respectively, vs. our prior estimates of $6.2M and $4.9M. We now project a full-year 2026 net loss of $0.72 per share vs. our prior net loss estimate of $0.62 per share. Immix ended 2Q26 with ~$234.2M in cash—providing an operational runway extending into mid-2027, in our view. After advancing our discounted cash flow (DCF)-based valuation and taking into account ex-U.S. sales from NXC-201, we reiterate our Buy rating and raise our 12-month price target to $25 from the prior $20 per share.
1 · Reply
Fugazi_
Fugazi_ Jul. 20 at 6:02 PM
$PRTA now someone seems to have sold 9 CALL, lame ...
1 · Reply
Fugazi_
Fugazi_ Jul. 17 at 5:37 PM
$PRTA someone bought 2k calls 11C, but why, no readouts til 2027+
1 · Reply
buyandsold
buyandsold Jul. 1 at 7:30 PM
$PRTA I really have to question why I own this. I do think it's got $30 potential but FFS can't they fire some people at lower costs in the meantime?
0 · Reply
Estimize
Estimize Jun. 25 at 11:00 AM
Wall St is expecting -0.39 EPS for $PRTA Q2 [Reporting 08/10 AMC] http://www.estimize.com/intro/prta?chart=historical&metric_name=eps&utm_c
0 · Reply
buyandsold
buyandsold Jun. 24 at 6:46 PM
Who is the shittiest money-burning management out of the following four retrobrates $KROS $PRTA $ARVN and $SPRO I rank them with the worst offender first in my opinion. I own the second and fourth offenders only. But I'm super tempted to try again with Kereos. There must be a way for me to get my hands on that Takeda money.
2 · Reply
Latest News on PRTA
Prothena Corporation Earnings release: Q2 2026

Aug 6, 2026, 4:00 PM EDT - 10 days ago

Prothena Corporation Earnings release: Q2 2026


Prothena Corporation Quarterly report: Q2 2026

Aug 6, 2026, 4:00 PM EDT - 10 days ago

Prothena Corporation Quarterly report: Q2 2026


Prothena Corporation Slides: Corporate presentation

Aug 6, 2026, 4:00 PM EDT - 10 days ago

Prothena Corporation Slides: Corporate presentation


Prothena price target raised to $20 from $19 at Citizens

2026-05-08T10:14:04.000Z - 3 months ago

Prothena price target raised to $20 from $19 at Citizens


Prothena Corporation Earnings release: Q1 2026

May 7, 2026, 4:00 PM EDT - 3 months ago

Prothena Corporation Earnings release: Q1 2026


Prothena Corporation Quarterly report: Q1 2026

May 7, 2026, 4:00 PM EDT - 3 months ago

Prothena Corporation Quarterly report: Q1 2026


Prothena Corporation Slides: Corporate presentation

May 5, 2026, 4:45 PM EDT - 3 months ago

Prothena Corporation Slides: Corporate presentation


Prothena to Report First Quarter 2026 Financial Results on May 7

Apr 30, 2026, 4:05 PM EDT - 3 months ago

Prothena to Report First Quarter 2026 Financial Results on May 7


Prothena names Annie Kingston as Chief Strategy Officer

2026-04-10T20:10:31.000Z - 4 months ago

Prothena names Annie Kingston as Chief Strategy Officer


Prothena Announces Leadership Team Updates

Apr 10, 2026, 4:05 PM EDT - 4 months ago

Prothena Announces Leadership Team Updates


Prothena Corporation Proxy statement: Proxy filing

Mar 27, 2026, 8:00 AM EDT - 5 months ago

Prothena Corporation Proxy statement: Proxy filing


Prothena Corporation Proxy statement: Proxy filing

Mar 27, 2026, 8:00 AM EDT - 5 months ago

Prothena Corporation Proxy statement: Proxy filing


Prothena Corporation Slides: Corporate presentation

Mar 9, 2026, 7:00 AM EDT - 5 months ago

Prothena Corporation Slides: Corporate presentation


Prothena announces $100M share repurchase plan

2026-02-27T21:20:51.000Z - 6 months ago

Prothena announces $100M share repurchase plan


Prothena expects to end year with $255M in cash, equivalents

2026-02-27T21:20:25.000Z - 6 months ago

Prothena expects to end year with $255M in cash, equivalents

BMY NVO


Prothena Announces up to $100 Million Share Repurchase Plan

Feb 27, 2026, 4:15 PM EST - 6 months ago

Prothena Announces up to $100 Million Share Repurchase Plan


Prothena Corporation Earnings Call Transcript: Q4 2025

Feb 19, 2026, 4:30 PM EST - 6 months ago

Prothena Corporation Earnings Call Transcript: Q4 2025


Prothena Corporation Annual report: Q4 2025

Feb 19, 2026, 4:30 PM EST - 6 months ago

Prothena Corporation Annual report: Q4 2025


Prothena Corporation Earnings release: Q4 2025

Feb 19, 2026, 4:30 PM EST - 6 months ago

Prothena Corporation Earnings release: Q4 2025


Prothena Corporation Slides: Q4 2025

Feb 19, 2026, 4:30 PM EST - 6 months ago

Prothena Corporation Slides: Q4 2025


Prothena Announces Board of Directors Update

Dec 12, 2025, 4:05 PM EST - 8 months ago

Prothena Announces Board of Directors Update


Prothena price target raised to $19 from $11 at Citizens JMP

2025-12-01T10:40:23.000Z - 9 months ago

Prothena price target raised to $19 from $11 at Citizens JMP


Prothena price target raised to $8 from $4 at BofA

2025-11-24T14:16:05.000Z - 9 months ago

Prothena price target raised to $8 from $4 at BofA

NVO


Prothena announces poster presentation on TDP-43 CYTOPE program

2025-11-19T21:10:54.000Z - 9 months ago

Prothena announces poster presentation on TDP-43 CYTOPE program


Prothena price target raised to $30 from $20 at H.C. Wainwright

2025-11-07T14:26:08.000Z - 10 months ago

Prothena price target raised to $30 from $20 at H.C. Wainwright


Prothena Corporation Quarterly report: Q3 2025

Nov 6, 2025, 4:00 PM EST - 10 months ago

Prothena Corporation Quarterly report: Q3 2025


Prothena Corporation Earnings release: Q3 2025

Nov 6, 2025, 4:00 PM EST - 10 months ago

Prothena Corporation Earnings release: Q3 2025


Prothena Corporation Proxy statement: Proxy Filing

Nov 6, 2025, 7:00 AM EST - 10 months ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena price target raised to $36 from $15 at Piper Sandler

2025-10-28T10:41:09.000Z - 10 months ago

Prothena price target raised to $36 from $15 at Piper Sandler


Prothena price target raised to $20 from $14 at H.C. Wainwright

2025-10-07T12:35:38.000Z - 11 months ago

Prothena price target raised to $20 from $14 at H.C. Wainwright


Prothena Corporation Proxy statement: Proxy Filing

Oct 7, 2025, 8:00 AM EDT - 11 months ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena Corporation Proxy statement: Proxy Filing

Oct 7, 2025, 8:00 AM EDT - 11 months ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena Corporation Proxy statement: Proxy Filing

Sep 25, 2025, 8:00 AM EDT - 11 months ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena Corporation Quarterly report: Q2 2025

Aug 4, 2025, 4:00 PM EDT - 1 year ago

Prothena Corporation Quarterly report: Q2 2025


Prothena Corporation Earnings release: Q2 2025

Aug 4, 2025, 4:00 PM EDT - 1 year ago

Prothena Corporation Earnings release: Q2 2025


Prothena Announces Corporate Restructuring

Jun 18, 2025, 4:05 PM EDT - 1 year ago

Prothena Announces Corporate Restructuring


Prothena Corporation Slides: Corporate Presentation

Jun 15, 2025, 7:00 AM EDT - 1 year ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Slides: Corporate Presentation

May 23, 2025, 7:00 AM EDT - 1 year ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Quarterly report: Q1 2025

May 8, 2025, 4:00 PM EDT - 1 year ago

Prothena Corporation Quarterly report: Q1 2025


Prothena Corporation Earnings release: Q1 2025

May 8, 2025, 4:00 PM EDT - 1 year ago

Prothena Corporation Earnings release: Q1 2025


Prothena Corporation Proxy statement: Proxy Filing

Mar 28, 2025, 8:00 AM EDT - 1 year ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena Corporation Proxy statement: Proxy Filing

Mar 28, 2025, 8:00 AM EDT - 1 year ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena Corporation Earnings Call Transcript: Q4 2024

Feb 20, 2025, 4:30 PM EST - 1 year ago

Prothena Corporation Earnings Call Transcript: Q4 2024


Prothena Corporation Annual report: Q4 2024

Feb 20, 2025, 4:30 PM EST - 1 year ago

Prothena Corporation Annual report: Q4 2024


Prothena Corporation Earnings release: Q4 2024

Feb 20, 2025, 4:30 PM EST - 1 year ago

Prothena Corporation Earnings release: Q4 2024


Prothena Corporation Slides: Q4 2024

Feb 20, 2025, 4:30 PM EST - 1 year ago

Prothena Corporation Slides: Q4 2024


Prothena Corporation Slides: Corporate Presentation

Feb 20, 2025, 7:00 AM EST - 1 year ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Slides: Corporate Presentation

Jan 10, 2025, 7:00 AM EST - 1 year ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Earnings release: Q3 2024

Nov 12, 2024, 4:00 PM EST - 1 year ago

Prothena Corporation Earnings release: Q3 2024


Prothena Corporation Quarterly report: Q3 2024

Nov 12, 2024, 4:00 PM EST - 1 year ago

Prothena Corporation Quarterly report: Q3 2024


Prothena Corporation Slides: Corporate Presentation

Nov 12, 2024, 7:00 AM EST - 1 year ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Slides: Corporate Presentation

Sep 26, 2024, 7:00 AM EDT - 2 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena to Participate in Upcoming Healthcare Conferences

Aug 29, 2024, 4:05 PM EDT - 2 years ago

Prothena to Participate in Upcoming Healthcare Conferences


Prothena Corporation Quarterly report: Q2 2024

Aug 8, 2024, 4:00 PM EDT - 2 years ago

Prothena Corporation Quarterly report: Q2 2024


Prothena Corporation Earnings release: Q2 2024

Aug 8, 2024, 4:00 PM EDT - 2 years ago

Prothena Corporation Earnings release: Q2 2024


Prothena Corporation Slides: Corporate Presentation

Aug 8, 2024, 7:00 AM EDT - 2 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Slides: Corporate Presentation

Jul 28, 2024, 7:00 AM EDT - 2 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Slides: Corporate Presentation

May 29, 2024, 7:00 AM EDT - 2 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Quarterly report: Q1 2024

May 8, 2024, 4:00 PM EDT - 2 years ago

Prothena Corporation Quarterly report: Q1 2024


Prothena Corporation Earnings release: Q1 2024

May 8, 2024, 4:00 PM EDT - 2 years ago

Prothena Corporation Earnings release: Q1 2024


Prothena Corporation Slides: Corporate Presentation

May 8, 2024, 7:00 AM EDT - 2 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Proxy statement: Proxy Filing

Mar 29, 2024, 8:00 AM EDT - 2 years ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena Corporation Proxy statement: Proxy Filing

Mar 29, 2024, 8:00 AM EDT - 2 years ago

Prothena Corporation Proxy statement: Proxy Filing


Prothena Corporation Earnings Call Transcript: Q4 2023

Feb 15, 2024, 4:30 PM EST - 2 years ago

Prothena Corporation Earnings Call Transcript: Q4 2023


Prothena Corporation Annual report: Q4 2023

Feb 15, 2024, 4:30 PM EST - 2 years ago

Prothena Corporation Annual report: Q4 2023


Prothena Corporation Earnings release: Q4 2023

Feb 15, 2024, 4:30 PM EST - 2 years ago

Prothena Corporation Earnings release: Q4 2023


Prothena Corporation Slides: Q4 2023

Feb 15, 2024, 4:30 PM EST - 2 years ago

Prothena Corporation Slides: Q4 2023


Prothena Corporation Slides: Corporate Presentation

Feb 14, 2024, 6:00 PM EST - 2 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Slides: Corporate Presentation

Jan 8, 2024, 7:00 AM EST - 2 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena Corporation Quarterly report: Q3 2023

Nov 2, 2023, 8:00 AM EDT - 3 years ago

Prothena Corporation Quarterly report: Q3 2023


Prothena Corporation Earnings release: Q3 2023

Nov 2, 2023, 8:00 AM EDT - 3 years ago

Prothena Corporation Earnings release: Q3 2023


Prothena Corporation Slides: Corporate Presentation

Nov 2, 2023, 8:00 AM EDT - 3 years ago

Prothena Corporation Slides: Corporate Presentation


Prothena prepares for potential sale - Bloomberg News

Oct 16, 2023, 11:57 AM EDT - 3 years ago

Prothena prepares for potential sale - Bloomberg News


Prothena Corporation Quarterly report: Q2 2023

Aug 3, 2023, 4:00 PM EDT - 3 years ago

Prothena Corporation Quarterly report: Q2 2023


Prothena Corporation Earnings release: Q2 2023

Aug 3, 2023, 4:00 PM EDT - 3 years ago

Prothena Corporation Earnings release: Q2 2023


Prothena Corporation Slides: Corporate Presentation

Aug 3, 2023, 1:30 PM EDT - 3 years ago

Prothena Corporation Slides: Corporate Presentation


Quantumup
Quantumup Aug. 14 at 10:35 AM
Citizens reiterated $IMMX Market Outperform-$23 and said that it sees 273% pot'l⬆️for its bull case ($42) and 47% pot'l⬇️for its bear case ($6). $PRTA $JNJ - GMAB BMY GILD - ACLX AZN ABBV REGN Citizens said -- We reiterate our Market Outperform rating and price target of $23 for Immix Biopharma based on a revenue and earnings multiples analysis. Recently, Immix reported 2Q26 earnings, and based on our conversation with management, we remain confident in regard to the cadence of value-driving milestones over the next 6-12 months. With NXC-201 on track to report top-line results in September and file a BLA in 1H27, a potential commercial launch by year-end 2026/early 2027, and a solid cash position of $232.1MM, we believe Immix shares represent an attractive investment opportunity, with ~47% potential downside (bear case $6) and ~273% potential upside (bull case $42).
0 · Reply
AIIAAIIA_88
AIIAAIIA_88 Aug. 13 at 7:15 PM
$ACIU $PRTA $AVXL Will this one be the winner on the AD/PD field? This field has been a graveyard for so many drug candidates…. I have 3-5-7 year horizon with my position with this one just established.
0 · Reply
buyandsold
buyandsold Aug. 10 at 10:51 PM
$PRTA Did they ever do any of the buyback that they have allocated?
0 · Reply
FilingTracker
FilingTracker Aug. 10 at 7:26 PM
$PRTA Insider purchase by 10% owner: https://filingtracker.ai/filing/1559053/0001045463-26-000010
0 · Reply
Quantumup
Quantumup Aug. 10 at 11:11 AM
H.C. Wainwright⬆️ $IMMX's PT to $25, reiterated Buy and said -- For 2Q26, Immix reported a net loss of $0.18 per share vs. our prior estimate of a net loss of $0.15 per share. $PRTA $JNJ - GMAB AZN ABBV REGN H.C. Wainwright added—R&D and SG&A expenses were $5.3M and $7.1M respectively, vs. our prior estimates of $6.2M and $4.9M. We now project a full-year 2026 net loss of $0.72 per share vs. our prior net loss estimate of $0.62 per share. Immix ended 2Q26 with ~$234.2M in cash—providing an operational runway extending into mid-2027, in our view. After advancing our discounted cash flow (DCF)-based valuation and taking into account ex-U.S. sales from NXC-201, we reiterate our Buy rating and raise our 12-month price target to $25 from the prior $20 per share.
1 · Reply
Fugazi_
Fugazi_ Jul. 20 at 6:02 PM
$PRTA now someone seems to have sold 9 CALL, lame ...
1 · Reply
Fugazi_
Fugazi_ Jul. 17 at 5:37 PM
$PRTA someone bought 2k calls 11C, but why, no readouts til 2027+
1 · Reply
buyandsold
buyandsold Jul. 1 at 7:30 PM
$PRTA I really have to question why I own this. I do think it's got $30 potential but FFS can't they fire some people at lower costs in the meantime?
0 · Reply
Estimize
Estimize Jun. 25 at 11:00 AM
Wall St is expecting -0.39 EPS for $PRTA Q2 [Reporting 08/10 AMC] http://www.estimize.com/intro/prta?chart=historical&metric_name=eps&utm_c
0 · Reply
buyandsold
buyandsold Jun. 24 at 6:46 PM
Who is the shittiest money-burning management out of the following four retrobrates $KROS $PRTA $ARVN and $SPRO I rank them with the worst offender first in my opinion. I own the second and fourth offenders only. But I'm super tempted to try again with Kereos. There must be a way for me to get my hands on that Takeda money.
2 · Reply
buyandsold
buyandsold Jun. 24 at 2:43 AM
$PRTA Could we break eleven for once?
0 · Reply
Quantumup
Quantumup Jun. 18 at 10:24 AM
BofA🏁 $IMMX and said: We initiate coverage of IMMX with a Buy rating and $27 PO. $PRTA $JNJ - GMAB ABBV REGN AZN BofA added: IMMX is developing NXC201 for AL amyloidosis, a rare disease with damaged vital organs and no approved treatments. Early data of NXC-201 shows ~95% complete response and rapid minimal residual disease in relapsed/refractory (r/r) AL amyloidosis. The safety profile was favorable for patients facing potential organ failure with no observed neurotoxicity. Updated phase 2 data is expected in late September, and 1-year follow-up data is expected in 1Q27 to support a potential BLA submission in 1H27. If approved, we think a clinical profile with deep and rapid response and tolerability could be key for adoption.
0 · Reply
YoloAlfred
YoloAlfred Jun. 17 at 9:47 AM
$PRTA 🤔🤔🤔🤔🤔
0 · Reply
NyseDayTrader
NyseDayTrader Jun. 15 at 1:36 PM
$PRTA With a $1 million purchase in the open market by a insider. ill play
1 · Reply
Guptasulo
Guptasulo Jun. 11 at 2:15 PM
$CGTX $PRTA $LLY $BIIB $ANVS For investors following AD, DLB and CNS: CGTX is building more than a single-asset story. DLB Psychosis: Registrational pathway 9 months trial supporting NDA following positive FDA interaction. SHINE:FDA's Phase 3-ready, 6-month dual-arm to NDA START: Ongoing Alzheimer's study in early, mild and moderate disease, Trial result expected completion in May 2027. Both SHINE+START trial covers Early, Mild and Moderate AD. Combined large AD trial for 2027 planned. Ph3 Psychosis is funded non-dilutive, Company is debt-free. Trial starts soon in 2026. Excellent Platform for CNS, no safety issues, and SHINE has proven efficacy though a small cohort CT1802 was pre-designed in the SHINE Trial.
1 · Reply
Estimize
Estimize Jun. 11 at 11:01 AM
Wall St is expecting -0.39 EPS for $PRTA Q2 [Reporting 08/10 AMC] http://www.estimize.com/intro/prta?chart=historical&metric_name=eps&utm_c
0 · Reply
Jtlo
Jtlo Jun. 10 at 6:26 PM
$PRTA makes me question a bit… the company has an authorization up to 100M at their discretion.l to buy back stock. It’s not low enough for them to pick up shares ?
0 · Reply
Jtlo
Jtlo Jun. 5 at 5:17 PM
$PRTA lol I bought in naturally it goes down
0 · Reply
Jtlo
Jtlo Jun. 5 at 3:41 PM
$PRTA I’m in. Fuck it. Grab 5.5K shares Good luck all
0 · Reply
Jtlo
Jtlo Jun. 5 at 2:49 PM
$PRTA can I get under 6?
0 · Reply
FilingTracker
FilingTracker Jun. 3 at 4:43 PM
$PRTA Insider purchase: https://www.sec.gov/Archives/edgar/data/1559053/000104546326000005/0001045463-26-000005-index.htm
0 · Reply
buyandsold
buyandsold May. 28 at 4:02 PM
$PRTA This has got to be the deadest money in the market. Valuable only because it won't decompose much further and it may yet arise like a zombie.
0 · Reply