PRTA — PROTHENA CORP PUBLIC LTD CO

Nasdaq · Health Care · Pharmaceuticals · CIK 1559053 ·
Last close
$9.39
Market Cap
$482.05M
52W High
$10.26
52W Low
$7.73
ADV30
484,107
Next earnings
2026-11-05
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 transthyretin amyloidosis; BMS-986446, an anti-tau antibody which is in Phase 2 clinical trial to treat Alzheimer's disease; PRX019, an investigational antibody which is in Phase 1 clinical trial for the treatment of neurodegenerative diseases; and PRX123, a Dual Aß-Tau Vaccine, which is in preclinical trial for treating Alzheimer's disease. In addition, it develops discovery- and late-preclinical-stage programs include TDP-43 CYTOPE for the treatment of amyotrophic lateral sclerosis; PRX012, a next-generation anti-Aß antibody which is in phase 1 clinical trial to treat Alzheimer's disease; and PRX012-TfR, a preclinical program for the treatment of Alzheimer's disease. It has a license, development, and commercialization agreement with F. Hoffmann-La Roche Ltd. and Hoffmann-La Roche Inc. to develop and commercialize antibodies that target a-synuclein, including prasinezumab; and master collaboration agreement with Bristol Myers Squibb to develop and commercialize antibodies targeting tau, TDP-43. Prothena Corporation plc was incorporated in 2012 and is based in Dublin, Ireland.

Quarterly Fundamentals

Revenues vs Net Income (last 4 Q)

Assets vs Liabilities (last 4 Q)

PeriodRevenuesGrossProfit OpIncomeNetIncomeAssets CashLiabilities
Jun 2026 1,010,000 -18,687,000 -18,583,000 302,579,000 288,193,000 15,688,000
Mar 2026 51,084,000 25,791,000 32,721,000 349,894,000 329,462,000 37,278,000
Dec 2025 21,000 -27,211,000 -21,589,000 326,804,000 307,531,000 46,330,000
Sep 2025 2,415,000 -39,761,000 -36,541,000 352,628,000 330,843,000 57,639,000

Cashflow TTM (yfinance, fills SEC gap)

Operating CF
$-60,049,000
Investing CF
$-662,000
Financing CF
$-22,531,000
CapEx
$-181,000
Dividends Paid
Buybacks
$-22,531,000
EPS Diluted TTM
$-0.84
As of
2026-08-09

Balance + Analyst (yfinance extras)

Retained Earnings
$-1,332,295,000
Inventory
Receivables
$0
ST Investments
EBIT TTM
$-59,868,000
Pretax Income TTM
$-44,350,000
Interest Exp TTM
Analysts
5

Yahoo Snapshot (yfinance, live)

Total Revenue
$54,530,000
EBITDA
$-59,040,000
Free Cash Flow
$-54,222,500
Enterprise Value
$203,932,400
Total Cash
$288,192,992
Total Debt
$6,991,000
Shares Out
51,336,974
Trailing EPS
$-0.82
Book Value
$5.54
ROE
-14.4%
ROA
-10.7%
Div Yield

Annual Trend (SEC EDGAR, last 4y)

Revenues vs Net Income (last 4y)

FY endRevenuesOpIncome NetIncomeAssetsLiabilities EquityOCF
Dec 2025 9,684,000 -184,560,000 -244,092,000 326,804,000 46,330,000 -163,580,000
Dec 2024 135,157,000 -154,561,000 -122,310,000 547,108,000 60,182,000 -150,050,000
Dec 2023 91,370,000 -191,036,000 -147,028,000 696,382,000 135,017,000 -133,906,000
Dec 2022 53,905,000 -131,557,000 -116,949,000 758,035,000 135,993,000 -108,821,000

TTM Snapshot

Revenues TTM
$226,527,000
NetIncome TTM
$26,389,000
OpCashFlow TTM
$0
Assets (Latest)
$547,108,000
Forward EPS
$-1.52

Max Pain — expiry 2026-12-18

max pain strike: $9.00 · spot: $9.39 · call oi: 2,288 · put oi: 2,361
Expected Move to 2026-12-18: ±$2.47 (26.30%) — implied range $6.92$11.86 · ATM straddle on $9.00 strike

Peers — same industry

TickerNameMarket CapLastDaily %
RZLT Rezolute, Inc. $482.42M $5.01
EPRX EUPRAXIA PHARMACEUTICALS INC. $479.80M $7.28
KMDA KAMADA LTD $486.36M $8.43
QTTB Q32 Bio Inc. $487.03M $16.36
RLMD RELMADA THERAPEUTICS, INC. $488.55M $4.58

News headlines (Yahoo Finance, 1h cache)

Prothena (PRTA) Reports Q2 Loss, Misses Revenue Estimates
2026-08-06 23:10 · Yahoo
Prothena to Report Second Quarter 2026 Financial Results on August 6
2026-07-30 20:05 · Yahoo
Earnings Beat: Prothena Corporation plc Just Beat Analyst Forecasts, And Analysts Have Been Updating Their Models
2026-05-11 13:17 · Yahoo
Prothena Posts Q1 Earnings as Revenues Surge on Milestone Payment
2026-05-08 14:36 · Yahoo
KMDA or PRTA: Which Is the Better Value Stock Right Now?
2026-08-14 15:40 · Yahoo
PRTA's Q2 Loss Narrower Than Expected, Pipeline Progress in Focus
2026-08-07 17:41 · Yahoo
Real Parkinson’s Disease Hope from Jupiter Neurosciences
2026-08-19 16:32 · Yahoo
Prothena Reports Second Quarter 2026 Financial Results and Business Highlights
2026-08-06 20:05 · Yahoo
PRTA Stock Rises Nearly 11% in Six Months: What's Driving It?
2026-07-09 15:38 · Yahoo
SRPT or PRTA: Which Is the Better Value Stock Right Now?
2026-06-24 15:40 · Yahoo

Recent Insider Activity

FiledTradeInsiderTitleType PriceQtyValue
2026-08-21 14:32:10 2026-08-20 Scully William P 10% P - Purchase 8.79 50000 439430