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PRTA

Prothena Corporation plc

Healthcare · USD

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Price alert · PRTA

All alert types
8.47 USD -0.41 -4.62%
As of Oct 30, 2026 Extended hours 8.47 0.00%
Bid
8.48 × 2
Ask
8.49 × 2
8.35 Day range 8.90
7.91 52-week range 11.51
YTD
-11.31%
1 year
-19.18%
Open
8.79
Prev close
8.88
Mkt cap
434.82M
Vol
452.30K
Avg vol
472.70K
EPS
-0.82
P/E
0.00
Div yield
0.00%
More statistics
Low
8.35
High
8.90
Forward P/E
-3.57
Beta
0.16
Short ratio
17.35
Inst. own
96.97%
Dividend
0.00
Ex-div date
50-d avg
15.72
200-d avg
20.26
1y target
49.75

2Y chart

Chart tools
Interval
PRTA two-year price chart4.327.9311.515.218.8Oct 24Mar 25Aug 25Jan 26Jun 26Oct 26

Key statistics

Market cap
824.89M
Enterprise value
311.20M
Trailing P/E
0.00
Forward P/E
-3.57
PEG ratio
0.00
Price / sales
6.19
Price / book
1.54
EPS (TTM)
-2.46
Beta
0.16
Dividend yield
0.00%
Payout ratio
0.00%
Profit margin
-98.86%
Revenue (TTM)
133.35M
Revenue growth
-98.90%
Free cash flow
-63.20M
Total cash
519.26M
Total debt
11.49M
Return on equity
-22.90%
Shares outstanding
53.81M
Short % of float
23.59%
50-day average
15.72
200-day average
20.26

Analyst view

Consensus: buy

Buy
Price target (mean) 49.75 +487.4% upside
Target (low)
22.00
Target (mean)
49.75
Target (high)
94.00
Ratings (0m) 10 8 buy · 2 hold · 0 sell
  • Strong buy3
  • Buy5
  • Hold2
  • Sell0
  • Strong sell0

Next earnings

Consensus EPS estimate -1.04.

Earnings history

Financials — quick view

All financials
PRTA Revenue — quarterly 1.01M
2022-Q3 20222022-Q4 20222023-Q1 20232023-Q2 20232023-Q3 20232023-Q4 20232024-Q1 20242024-Q2 20242024-Q3 20242024-Q4 20242025-Q1 20252025-Q2 20252025-Q3 20252025-Q4 20252026-Q1 20262026-Q2 2026
PRTA Net income — quarterly -18.58M
2022-Q3 20222022-Q4 20222023-Q1 20232023-Q2 20232023-Q3 20232023-Q4 20232024-Q1 20242024-Q2 20242024-Q3 20242024-Q4 20242025-Q1 20252025-Q2 20252025-Q3 20252025-Q4 20252026-Q1 20262026-Q2 2026
PRTA EPS — quarterly -0.36
2022-Q3 20222022-Q4 20222023-Q1 20232023-Q2 20232023-Q3 20232023-Q4 20232024-Q1 20242024-Q2 20242024-Q3 20242024-Q4 20242025-Q1 20252025-Q2 20252025-Q3 20252025-Q4 20252026-Q1 20262026-Q2 2026

Earnings

PRTA recent earnings
Report dateQuarter endingEPS estimateEPS reportedSurpriseSurprise %
Nov 12, 2024Sep 1, 2024-1.18-1.10+0.08+6.78%
Aug 8, 2024Jun 1, 2024-1.011.22+2.23+220.79%
May 8, 2024Mar 1, 2024-1.21-1.34-0.13-10.74%
Feb 15, 2024Dec 1, 2023-1.23-1.26-0.03-2.44%
Nov 2, 2023Sep 1, 2023-0.260.38+0.64+246.15%
Aug 3, 2023Jun 1, 2023-0.92-1.03-0.11-11.96%

Upgrades / downgrades

PRTA analyst upgrades and downgrades
DateFirmActionFromTo
Dec 20, 2024HC Wainwright & Co.reitBuyBuy
Dec 20, 2024Chardan Capitalinit—Buy
Dec 19, 2024B of A SecuritiesmainNeutralNeutral
Nov 13, 2024HC Wainwright & Co.reitBuyBuy
Oct 1, 2024B of A SecuritiesmainNeutralNeutral
Oct 1, 2024HC Wainwright & Co.reitBuyBuy

About Prothena Corporation plc

Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat diseases caused by protein dysregulation in the United States. The company is involved in developing birtamimab, an investigational humanized antibody that is in Phase III clinical trial for the treatment of AL amyloidosis; Prasinezumab, a humanized monoclonal antibody, for the treatment of Parkinson's disease and other related synucleinopathies which is in Phase IIb clinical trial; NNC6019 that is in Phase lI clinical trial for the treatment of ATTR amyloidosis; and BMS-986446 and PRX012, which is in Phase I clinical trial for the treatment of Alzheimer's disease. Its discovery and preclinical programs include PRX123, a dual Aß-Tau vaccine for the treatment and prevention of Alzheimer's disease; and PRX019 for the treatment of neurogenerative diseases, as well as TDP-43 for the treatment of amyotrophic lateral sclerosis. Prothena Corporation plc 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 a collaboration agreement with Bristol-Myers Squibb to develop and commercialize antibodies targeting tau, TDP-43. The company was incorporated in 2012 and is based in Dublin, Ireland.

Sector
Healthcare
Industry
Biotechnology
Country
Ireland
Website
prothena.com

News

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Insider holders

PRTA insider holders
InsiderRelationLatest transactionDateShares held
COOKE SHANE MDirectorConversion of Exercise of derivative securityJan 9, 20230
GARREN HIDEKIOfficerConversion of Exercise of derivative securitySep 12, 20230
KARP CAROL DOfficerConversion of Exercise of derivative securityOct 3, 20230
KINNEY GENE G PH.D.Chief Executive OfficerConversion of Exercise of derivative securityMay 16, 202312,793
MALECEK MICHAEL J.OfficerConversion of Exercise of derivative securitySep 26, 20230
NGUYEN TRAN BRYANChief Financial OfficerConversion of Exercise of derivative securityMay 16, 20233,200

Institution ownership

PRTA institution ownership
Holder% heldSharesValueReported
EcoR1 Capital, LLC21.53%11,584,280177.59MSep 29, 2024
FMR, LLC14.99%8,066,983123.67MSep 29, 2024
Wellington Management Group, LLP7.77%4,178,78864.06MSep 29, 2024
Blackrock Inc.7.49%4,028,38761.76MSep 29, 2024
Price (T.Rowe) Associates Inc7.10%3,822,43458.60MSep 29, 2024
Palo Alto Investors Lp3.23%1,737,96426.64MSep 29, 2024

Fund ownership

PRTA fund ownership
Holder% heldSharesValueReported
Vanguard Specialized-Health Care Fund5.59%3,007,60346.11MJul 30, 2024
Fidelity Growth Company Fund4.38%2,355,27736.11MOct 30, 2024
Price (T.Rowe) New Horizons Fund3.52%1,891,62729.00MSep 29, 2024
iShares Russell 2000 ETF2.02%1,086,12116.65MOct 30, 2024
Fidelity Growth Company K6 Fund1.52%816,39012.52MOct 30, 2024
Fidelity Series Growth Company Fund1.41%758,60511.63MOct 30, 2024
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