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Market cap
$475.4M
51M shares
52-week range
$7.73 – $11.80
33% from low
Sector
PHARMACEUTICAL PREPARATIONS
Exchange
NASDAQ
CS
Prothena Corp PLC is a late-stage clinical biotechnology company that focuses on protein dysregulation and a pipeline of investigational therapeutics with the potential to change the course of devastating neurodegenerative and rare and peripheral amyloid diseases. Prothena is developing and applying its proprietary CYTOPE technology to target a broad spectrum of intracellular disease pathways in the brain and periphery. The company's pipeline includes both wholly-owned and partnered programs like Prasinezumab, Coramitug (PRX004), BMS-986446 (PRX005), PRX019, TDP-43 CYTOPE, and PRX012-TfR, being developed for the potential treatment of Parkinson's disease, ATTR amyloidosis with cardiomyopathy, Alzheimer's disease, Amyotrophic lateral sclerosis (ALS), and other neurodegenerative diseases.
www.prothena.comNo one on the platform currently holds PRTA.
No tracked institution reports a position in PRTA as of their last filing.
No one on the platform has traded PRTA yet.
Click to see transaction details on SEC.gov. Form 4s cover trades by officers, directors, and 10%+ owners, due within 2 business days of the trade.
$ACIU $PRTA $AVXL Will this one be the winner on the AD/PD field? This field has been a graveyard for so many drug candidates…. I have 3-5-7 year horizon with my position with this one just established.
View on StockTwits ↗$PRTA Did they ever do any of the buyback that they have allocated?
View on StockTwits ↗$PRTA Insider purchase by 10% owner: https://filingtracker.ai/filing/1559053/0001045463-26-000010
View on StockTwits ↗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 $20 per share.
View on StockTwits ↗$PRTA someone bought 2k calls 11C, but why, no readouts til 2027+
View on StockTwits ↗$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?
View on StockTwits ↗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
View on StockTwits ↗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.
View on StockTwits ↗BofA🏁 $IMMX and said: We initiate coverage of IMMX with a Buy rating and $27 PO. $PRTA $JNJ - GMAB ABBV REGN AZN BofA added: IMMX is developing NXC201 for AL amyloidosis, a rare disease with damaged vital organs and no approved treatments. Early data of NXC-201 shows ~95% complete response and rapid minimal residual disease in relapsed/refractory (r/r) AL amyloidosis. The safety profile was favorable for patients facing potential organ failure with no observed neurotoxicity. Updated phase 2 data is expected in late September, and 1-year follow-up data is expected in 1Q27 to support a potential BLA submission in 1H27. If approved, we think a clinical profile with deep and rapid response and tolerability could be key for adoption.
View on StockTwits ↗$PRTA With a $1 million purchase in the open market by a insider. ill play
View on StockTwits ↗$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.
View on StockTwits ↗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
View on StockTwits ↗Recent $TICKER stream from stocktwits.com — refreshed every 5 minutes. Sentiment tags are self-reported by posters. Not investment advice.
| Year | Est. revenue | Growth | Est. EPS | EPS range | Fwd P/E | # Analysts |
|---|---|---|---|---|---|---|
| 2026 | $83M | +668.8% | $-0.07 | $-0.29–$0.25 | — | 4 |
| 2027 | $26M | -68.3% | $-1.03 | $-1.18–$-0.75 | — | 3 |
| 2028 | $135M | +410.5% | $0.17 | $-0.67–$1.78 | 54.2× | 3 |
| 2029 | $201M | +48.8% | $-0.17 | $-0.22–$-0.12 | — | 1 |
Forward consensus · growth is YoY vs the prior fiscal-year estimate · Fwd P/E at the current price · source: Financial Modeling Prep
Beat consensus in 4 of the last 8 reported quarters
| Reported | Est. EPS | Actual | Surprise |
|---|---|---|---|
| 2026-08-06 | $-0.39 | $-0.32 | +17.9% |
| 2026-05-07 | $-0.31 | $0.60 | +293.5% |
| 2026-02-19 | $-0.45 | $-0.44 | +2.2% |
| 2025-11-06 | $-0.60 | $-0.67 | -11.7% |
| 2025-08-04 | $-1.11 | $-1.86 | -67.6% |
| 2025-05-08 | $-0.92 | $-1.12 | -21.7% |
| 2025-02-20 | $-1.02 | $-1.08 | -5.9% |
| 2024-11-12 | $-1.18 |
| $-1.10 |
| +6.8% |
| $83M |
| — |
| KALVKalVista Pharmaceuticals, Inc. | $27.00 | +0.00% | $1.4B | — |
| NMRANeumora Therapeutics, Inc. Common Stock | $1.73 | +1.17% | $321M | — |
Source: Financial Modeling Prep · peers by sector/industry