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NEW: Price Reaction to Earnings Reports

View detailed tables showing price action before and after earnings announcements, ranging from intraday to one week out. Track how the market has reacted to past earnings to identify patterns and predict future behavior. Click here to open.

PRTA

Prothena Corporation plc

Dec 26 • 04:00PM ET

15.74

Dollar change +0.34
Percentage change 2.21	%

Healthcare • Biotechnology • Ireland • NASD

Peers: VRTX BIIB ALNY IONS SRPT NBIX EXEL ACAD ARWR CLDX

| Held by: IWM XBI VXF IBB IWO VTWO SCHA IWN VHT LABU

Scroll to Statements

Index	RUT	P/E	-	EPS (ttm)	-2.48	Insider Own	16.76%	Shs Outstand	53.81M	Perf Week	31.72%
Market Cap	846.94M	Forward P/E	-	EPS next Y	-4.06	Insider Trans	0.00%	Shs Float	44.79M	Perf Month	4.38%
Income	-131.83M	PEG	-	EPS next Q	-1.02	Inst Own	94.76%	Short Float	19.64%	Perf Quarter	-21.85%
Sales	133.35M	P/S	6.35	EPS this Y	19.77%	Inst Trans	3.29%	Short Ratio	14.34	Perf Half Y	-23.33%
Book/sh	9.93	P/B	1.58	EPS next Y	-83.44%	ROA	-19.64%	Short Interest	8.80M	Perf Year	-60.86%
Cash/sh	9.65	P/C	1.63	EPS next 5Y	34.07%	ROE	-22.90%	52W Range	11.70 - 41.54	Perf YTD	-56.69%
Dividend Est.	-	P/FCF	-	EPS past 5Y	6.83%	ROI	-24.27%	52W High	-62.11%	Beta	0.07
Dividend TTM	-	Quick Ratio	11.52	Sales past 5Y	4680.14%	Gross Margin	87.28%	52W Low	34.53%	ATR (14)	1.33
Dividend Ex-Date	-	Current Ratio	11.52	EPS Y/Y TTM	-77.69%	Oper. Margin	-126.12%	RSI (14)	54.22	Volatility	13.42% 9.59%
Employees	173	Debt/Eq	0.02	Sales Y/Y TTM	-5.41%	Profit Margin	-98.86%	Recom	1.40	Target Price	49.75
Option/Short	Yes / Yes	LT Debt/Eq	0.02	EPS Q/Q	-390.42%	Payout	-	Rel Volume	0.55	Prev Close	15.40
Sales Surprise	-27.98%	EPS Surprise	5.78%	Sales Q/Q	-98.86%	Earnings	Nov 13 BMO	Avg Volume	613.57K	Price	15.74
SMA20	8.80%	SMA50	0.80%	SMA200	-21.56%	Trades		Volume	336,786	Change	2.21%

Date	Action	Analyst	Rating Change	Price Target Change
Dec-20-24	Initiated	Chardan Capital Markets	Buy	$40
Jan-30-24	Downgrade	BofA Securities	Buy → Neutral	$68 → $38
Dec-12-23	Initiated	Deutsche Bank	Buy	$62
Apr-24-23	Initiated	SVB Securities	Outperform	$80
Jan-27-23	Initiated	Piper Sandler	Overweight	$94
Nov-04-22	Downgrade	RBC Capital Mkts	Outperform → Sector Perform	$52 → $55
Sep-28-22	Upgrade	BofA Securities	Neutral → Buy
Nov-19-21	Initiated	JMP Securities	Mkt Outperform	$77
Jun-18-21	Upgrade	BofA Securities	Underperform → Neutral	$12 → $49
Jun-08-21	Reiterated	Oppenheimer	Outperform	$45 → $54
May-26-21	Initiated	Citigroup	Buy	$39
Feb-26-21	Upgrade	RBC Capital Mkts	Sector Perform → Outperform	$14 → $28
Feb-12-21	Upgrade	Jefferies	Hold → Buy	$15 → $30
Feb-02-21	Upgrade	BTIG Research	Neutral → Buy	$29
Dec-07-20	Initiated	H.C. Wainwright	Buy	$22
Jul-09-20	Upgrade	Oppenheimer	Perform → Outperform	$16
Nov-19-19	Upgrade	Evercore ISI	In-line → Outperform	$14
May-21-18	Downgrade	Barclays	Equal Weight → Underweight	$14 → $12
Apr-23-18	Downgrade	Jefferies	Buy → Hold
Apr-05-18	Reiterated	Barclays	Overweight	$70 → $50

Show Previous Ratings

Dec-19-24 04:22PM	Prothena Catapults, Flashing A Bullish Sign, On Promise In Parkinson's Disease (Investor's Business Daily) +33.97%
08:09AM	Prothenas Parkinsons study fails primary endpoint despite some success (Clinical Trials Arena)
01:05AM	Roches Phase IIb Study of Prasinezumab Missed Primary Endpoint, But Suggests Possible Clinical Benefit in Early-Stage Parkinsons Disease (Business Wire)
Dec-12-24 11:30AM	Why Is Prothena (PRTA) Down 17.9% Since Last Earnings Report? (Zacks)
Nov-12-24 05:55PM	Prothena (PRTA) Reports Q3 Loss, Misses Revenue Estimates (Zacks)
04:56PM	Loading…
04:56PM	Prothena: Q3 Earnings Snapshot (Associated Press Finance)
04:05PM	Prothena Reports Third Quarter 2024 Financial Results and Business Highlights (Business Wire)
Nov-05-24 04:05PM	Prothena to Report Third Quarter 2024 Financial Results on November 12 (Business Wire) +8.71%
Oct-29-24 12:00PM	Prothena (PRTA) Upgraded to Buy: What Does It Mean for the Stock? (Zacks)
04:48AM	Strength Seen in Prothena (PRTA): Can Its 15.0% Jump Turn into More Strength? (Zacks)
Oct-18-24 03:01PM	State Street Corp's Strategic Reduction in Prothena Corp PLC Holdings (GuruFocus.com)
Sep-27-24 04:05PM	Prothena Announces Leadership Team Updates (Business Wire) -16.56%
Aug-29-24 04:05PM	Prothena to Participate in Upcoming Healthcare Conferences (Business Wire)
Aug-19-24 12:00PM	What Makes Prothena (PRTA) a New Buy Stock (Zacks)
Aug-18-24 12:28AM	Prothena Corporation plc (PTRA): Positioning Among Top Debt-Free Stocks (Insider Monkey)
08:22AM	Loading…
Aug-17-24 08:22AM	7 Best Debt Free Stocks To Buy (Insider Monkey)
Aug-09-24 09:16AM	Prothena (PRTA) Q2 Earnings Benefit From Collaboration Revenues (Zacks)
Aug-08-24 06:40PM	Prothena (PRTA) Q2 Earnings and Revenues Beat Estimates (Zacks)
05:33PM	Prothena: Q2 Earnings Snapshot (Associated Press Finance)
04:05PM	Prothena Reports Second Quarter 2024 Financial Results and Business Highlights (Business Wire)
Aug-01-24 04:05PM	Prothena to Report Second Quarter 2024 Financial Results on August 8 (Business Wire) -5.20%
Jul-25-24 10:02AM	Prothena (PRTA) Expected to Beat Earnings Estimates: What to Know Ahead of Q2 Release (Zacks)
Jun-24-24 08:48AM	Prothena (PRTA) Moves 9.3% Higher: Will This Strength Last? (Zacks)
Jun-11-24 04:07PM	Eli Lilly Seesaws On FDA Win, And Pushes Alzheimer's Stocks Prothena, Eisai Lower (Investor's Business Daily)
12:20PM	Eli Lilly Drags Alzheimer's Stocks Prothena, Eisai Lower Despite FDA Win (Investor's Business Daily)
Jun-07-24 11:30AM	Why Is Prothena (PRTA) Down 1.5% Since Last Earnings Report? (Zacks)
May-29-24 10:26AM	Prothena (PRTA), Bristol Myers Tie Up for Second Neuro Candidate (Zacks)
08:46AM	BMS stakes $80m on Prothenas neurodegenerative candidate (Pharmaceutical Technology)
May-28-24 04:05PM	Prothena Announces Bristol Myers Squibb Opt-in for Exclusive Global License for PRX019, the Second Program from Global Neuroscience Research and Development Collaboration (Business Wire)
May-09-24 11:52AM	Prothena (PRTA) Q1 Earnings Miss Estimates on Higher R&D Expenses (Zacks)
10:56PM	Loading…
May-08-24 10:56PM	PRTA Stock Earnings: Prothena Corp Misses EPS, Misses Revenue for Q1 2024 (InvestorPlace)
06:10PM	Prothena (PRTA) Reports Q1 Loss, Lags Revenue Estimates (Zacks)
05:14PM	Prothena: Q1 Earnings Snapshot (Associated Press Finance)
04:05PM	Prothena Reports First Quarter 2024 Financial Results and Business Highlights (Business Wire)
May-01-24 04:05PM	Prothena to Report First Quarter 2024 Financial Results on May 8 (Business Wire) +5.31%
Apr-25-24 10:01AM	Earnings Preview: Prothena (PRTA) Q1 Earnings Expected to Decline (Zacks)
Apr-15-24 04:05PM	Prothena Announces Review on Birtamimab Mechanism of Action and Pharmacological Characteristics Published in Leukemia & Lymphoma (Business Wire)
Mar-28-24 08:00AM	Race To Treat Alzheimer's Disease Is Heating Up Despite Eli Lilly's Setback (Investor's Business Daily)
Mar-05-24 04:05PM	Prothena to Participate in Upcoming Healthcare Conferences (Business Wire)
Mar-04-24 04:05PM	Prothena Appoints David Ford to Newly Created Chief People Officer Position (Business Wire)
Feb-21-24 04:05PM	Prothena Announces Appointment of Daniel G. Welch as Director and Chair Designate (Business Wire)
Feb-16-24 01:33PM	Prothena (PRTA) Q4 Earnings Miss Estimates on Higher R&D Expense (Zacks)
10:33AM	Prothena Corporation plc (NASDAQ:PRTA) Q4 2023 Earnings Call Transcript (Insider Monkey)
Feb-15-24 04:50PM	Prothena: Q4 Earnings Snapshot (Associated Press Finance)
04:48PM	Prothena Corp PLC (PRTA) Reports 2023 Financial Results and Provides 2024 Outlook (GuruFocus.com)
04:05PM	Prothena Reports Fourth Quarter and Full Year 2023 Financial Results, and Provides Financial Guidance and Business Highlights (Business Wire)
Feb-08-24 04:05PM	Prothena to Report Fourth Quarter and Full Year 2023 Financial Results on February 15, 2024 (Business Wire)
Jan-24-24 11:02PM	Prothena Corp PLC Chief Accounting Officer Sells 5,000 Shares (GuruFocus.com)
Jan-10-24 12:06PM	Prothena's (PRTA) Update on Pipeline Progress Disappoints (Zacks) -9.46%
05:38AM	Prothena (PRTA) Surges 12.3%: Is This an Indication of Further Gains? (Zacks)
Jan-08-24 08:30AM	Prothena Provides Updates on PRX012, PRX123, Birtamimab and Portfolio Programs (Business Wire) -13.23%
Dec-21-23 09:01AM	Prothena Corp PLC Chief Accounting Officer Sells Company Shares (GuruFocus.com)
Dec-17-23 05:41AM	These 3 Biotech Stocks Have Strong Upside Potential, Says Deutsche Bank (TipRanks)
Dec-01-23 11:05AM	Insider Sell Alert: Karin Walker of Prothena Corp PLC Cashes Out 5,000 Shares (GuruFocus.com) +7.09%
Nov-29-23 08:35AM	Stocks To Buy And Watch: Top IPOs, Big And Small Caps, Growth Stocks (Investor's Business Daily)
Nov-20-23 06:00AM	FOCUS-Researchers return to Alzheimer's vaccines, buoyed by recent drug success (Reuters)
Nov-17-23 01:35PM	Prothena (PRTA) Pipeline Shows Promise in a Tough AD Market (Zacks)
08:15AM	Quest For Alzheimer's Cure: Big Biotech Breakthroughs, But The Race Is Just Beginning (Investor's Business Daily)
Nov-03-23 11:34AM	Prothena (PRTA) Q3 Earnings Beat on Collaboration Revenue Hike (Zacks) +7.41%
Nov-02-23 07:03PM	Prothena Corp PLC (PRTA) Reports Q3 2023 Financial Results (GuruFocus.com)
06:25PM	Prothena (PRTA) Beats Q3 Earnings and Revenue Estimates (Zacks)
05:24PM	Prothena: Q3 Earnings Snapshot (Associated Press Finance)
04:05PM	Prothena Reports Third Quarter 2023 Financial Results and Business Highlights (Business Wire)
Oct-30-23 10:00AM	Analysts Estimate Axsome Therapeutics (AXSM) to Report a Decline in Earnings: What to Look Out for (Zacks)
Oct-26-23 04:09PM	Biogen Pulls Prothena Into A Steep Dive On Mixed Results For Alzheimer's Treatment (Investor's Business Daily) -14.62% +5.52%
04:05PM	Prothena to Report Third Quarter 2023 Financial Results on November 2 (Business Wire)
10:02AM	Prothena (PRTA) Expected to Beat Earnings Estimates: Can the Stock Move Higher? (Zacks)
05:02AM	Insider Sell: Karin Walker Sells 5,000 Shares of Prothena Corp PLC (GuruFocus.com)
Oct-18-23 11:20AM	5 Biotech Stocks Set to Outpace Q3 Earnings Estimates (Zacks)
Oct-17-23 07:57AM	Prothena (PRTA) Soars 18.7%: Is Further Upside Left in the Stock? (Zacks) -9.92%
Oct-16-23 11:54AM	UPDATE 1-Prothena prepares for potential sale - Bloomberg News (Reuters) +18.69%
11:42AM	Prothena preparing for a potential sale - Bloomberg News (Reuters)
Oct-12-23 05:01AM	Insider Sell: Brandon Smith Sells 4,000 Shares of Prothena Corp PLC (GuruFocus.com)
Oct-07-23 03:33PM	12 Stock Picks From Our Healthcare Roundtable Pros. Weight Loss Isnt the Only Big Deal in Medicine. (Barrons.com)
Oct-05-23 09:01AM	Insider Sell: Chief Regulatory Officer Carol Karp Sells 5,000 Shares of Prothena Corp PLC (GuruFocus.com)
Sep-28-23 05:01AM	Insider Sell: Prothena Corp PLC's Chief Legal Officer Michael Malecek Sells 5,000 Shares (GuruFocus.com)
Sep-19-23 09:01PM	Insider Sell: Karin Walker Sells 5,000 Shares of Prothena Corp PLC (GuruFocus.com)
Sep-14-23 01:32PM	Insider Sell: Chief Medical Officer Hideki Garren Sells 2,000 Shares of Prothena Corp PLC (GuruFocus.com)
Sep-07-23 12:00PM	Prothena (PRTA) Skyrockets 88.7% in 12 Months: Here's Why (Zacks)
Aug-31-23 04:05PM	Prothena to Participate in Upcoming Healthcare Conferences (Business Wire)
Aug-04-23 09:13AM	Prothena (PRTA) Q2 Earnings and Revenues Miss Estimates (Zacks) -7.30%
Aug-03-23 05:55PM	Prothena (PRTA) Reports Q2 Loss, Lags Revenue Estimates (Zacks)
04:49PM	Prothena: Q2 Earnings Snapshot (AP Finance)
04:05PM	Prothena Reports Second Quarter 2023 Financial Results and Business Highlights (Business Wire)
Aug-02-23 07:57AM	Prothena Corporation plc (NASDAQ:PRTA) Shares Could Be 36% Below Their Intrinsic Value Estimate (Simply Wall St.)
Jul-27-23 04:05PM	Prothena to Report Second Quarter 2023 Financial Results on August 3 (Business Wire)
Jul-18-23 05:36PM	The Fight Against Alzheimers Goes Beyond Plaque. Tangles Are a Target, Too. (Barrons.com)
05:36PM	The Fight Against Alzheimer Goes Beyond Plaque. Tangles Are a Target Too. (Barrons.com)
11:30AM	Lilly's (LLY) Donanemab Slows Alzheimer's Disease Progression (Zacks)
Jul-17-23 08:35AM	Prothena Presents New Research in the Treatment of Alzheimers Disease at Alzheimers Association International Conference® 2023 (AAIC®) (Business Wire)
Jul-13-23 09:22AM	Biotech Stock Roundup: BIIB, Eisai's Drug Update, NVAX Gains on Deal Amendment (Zacks)
Jul-11-23 04:05PM	Prothena to Present New Data from Alzheimers Disease Programs at Alzheimers Association International Conference® 2023 (AAIC®) (Business Wire)
08:59AM	Prothena (PRTA) Alzheimer's Disease Drug Licensed by BMY (Zacks)
Jul-10-23 04:10PM	Prothena Announces Bristol Myers Squibb Opt-in for Worldwide Rights of PRX005, a Novel Anti-MTBR-Tau Antibody (Business Wire)
Jul-07-23 09:51AM	Biogen (BIIB), Eisai Get Full FDA Nod for Leqembi in Alzheimer's (Zacks)
Jun-27-23 04:05PM	Prothena Announces Phase 3 VITAL Clinical Trial Results Published in Blood Showing Survival Benefit in Patients with Mayo Stage IV AL Amyloidosis Treated with Birtamimab (Business Wire)
Jun-12-23 09:25AM	Biogen (BIIB), Eisai Alzheimer Drug Gets FDA Panel Endorsement (Zacks) +5.05%
Jun-08-23 12:41PM	Biogen (BIIB), Eisai's Alzheimer Drug Likely to Get Full FDA Nod (Zacks)
Jun-02-23 04:05PM	Prothena to Participate in Jefferies 2023 Healthcare Conference (Business Wire)
May-16-23 04:05PM	Prothena Announces Appointment of Billy Dunn, M.D., to its Board of Directors (Business Wire)

Prothena Corp. Plc is a clinical-stage neuroscience company, which engages in the discovery and development of novel therapies to change the course of devastating diseases. The firm's clinical pipeline includes both wholly owned and partnered programs being developed for the potential treatment of diseases including AL amyloidosis, ATTR amyloidosis, Alzheimer's disease, Parkinson's disease and other neurodegenerative diseases. The company was founded in December 1969 and is headquartered in Dublin, Ireland.

Insider Trading	Relationship	Date	Transaction	Cost	#Shares	Value ($)	#Shares Total	SEC Form 4
Walker Karin L	Chief Accounting Officer	Jan 24 '24	Option Exercise	13.53	5,000	67,650	5,000	Jan 24 07:01 PM
Walker Karin L	Chief Accounting Officer	Jan 24 '24	Sale	34.00	5,000	170,000	0	Jan 24 07:01 PM

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PRTA

Prothena Corporation plc

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