PRTA Company Profile and Key Details

Q: Who are the executives of PRTA?

Ms. Carol D. KarpChief Regulatory OfficerDr. Hideki Garren M.D., Ph.D.Chief Medical OfficerMs. Karin L. Walker CPA, CPAChief Accounting Officer & ControllerMs. Jennifer ZibudaDirector of Investor Relations & CommunicationMr. Brandon S. SmithChief Operating OfficerMr. Michael J. MalecekChief Legal Officer & Company Sec.Dr. Gene G. Kinney Ph.D.Pres, Chief Executive Officer & DirectorDr. Wagner M. ZagoChief Scientific OfficerMs. Yvonne M. TchrakianCompany Sec.Mr. Tran B. Nguyen M.B.A.Chief Financial Officer & Chief Strategy Officer

NASDAQ : PRTA

Prothena

$9.69

0.435+4.70%

Open: 3:51 PM

60.49

BESG ScoreESG Rating

Profile Key Stats Analyst Ratings Ownership Ratios Financials Dividend & splits Sentiment Forecast

Price Chart

Stock Price Today

Prothena Corporation plc (PRTA) stock surged +4.70%, trading at $9.69 on NASDAQ, up from the previous close of $9.25. The stock opened at $9.28, fluctuating between $9.28 and $9.71 in the recent session.

Stock Snapshot

9.25

Prev. Close

521.34M

Market Cap

9.28

Day Low

-1.86

P/E Ratio

-5.2

EPS (TTM)

-2.55

Cash Flow per Share

9.28

Open

53.83M

Number of Shares

9.7099

Day High

74.48%

Free Float in %

10.46

Book Value

408.59K

Volume

Relevant Articles

SEC Fillings

Current Report (8-k)

Filing Date	Accepted Date

Annual Report (10-k)

Filing Date	Accepted Date

Stock Price History Chart

Date	Open	High	Low	Close	Volume
Jan 20, 2026	9.12	9.55	9.00	9.25	630.81K
Jan 16, 2026	9.29	9.45	8.94	9.35	740.51K
Jan 15, 2026	9.16	9.28	8.91	9.26	601.97K
Jan 14, 2026	8.94	9.26	8.84	9.20	398.47K
Jan 13, 2026	8.77	9.06	8.77	8.98	470.37K
Jan 12, 2026	9.16	9.16	8.65	8.91	581.59K
Jan 09, 2026	9.19	9.34	9.11	9.19	401.92K
Jan 08, 2026	9.03	9.16	8.95	9.05	375.98K
Jan 07, 2026	9.00	9.47	8.96	9.13	467.54K
Jan 06, 2026	9.01	9.14	8.89	8.97	636.41K
Jan 05, 2026	9.24	9.24	8.92	9.10	539.12K
Jan 02, 2026	9.56	9.69	9.07	9.20	526.92K
Dec 31, 2025	9.30	9.56	9.24	9.55	466.24K
Dec 30, 2025	9.45	9.52	9.29	9.31	346.4K
Dec 29, 2025	9.49	9.55	9.34	9.48	479.58K
Dec 26, 2025	9.67	9.67	9.43	9.54	422.45K
Dec 24, 2025	9.46	9.74	9.23	9.69	237.36K
Dec 23, 2025	9.51	9.59	9.29	9.49	695.99K
Dec 22, 2025	9.16	9.78	9.07	9.68	665.39K
Dec 19, 2025	9.38	9.56	9.11	9.21	4M

Contact Details

Dublin, 2

Ireland

https://www.prothena.com 353 123 62500

About Company

Prothena Corporation plc, a late-stage clinical company, focuses on discovery and development of novel therapies for life-threatening diseases 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, which is in Phase IIb clinical trial for the treatment of Parkinson's disease; PRX004 that completed Phase I clinical trial for the treatment of Transthyretin amyloidosis; and PRX005, which is in Phase I clinical trial for the treatment of Alzheimer's disease. Its discovery and preclinical programs include PRX012 for the treatment of Alzheimer's disease; and dual A�-Tau vaccine for the treatment and prevention of Alzheimer's disease. 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 alpha-synuclein; and a collaboration agreement with Bristol-Myers Squibb to develop antibodies. The company was founded in 2012 and is based in Dublin, Ireland.

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Frequently Asked Questions

What is the current Prothena Corporation plc (PRTA) stock price?

Prothena Corporation plc (NASDAQ: PRTA) stock price is $9.69 in the last trading session. During the trading session, PRTA stock reached the peak price of $9.71 while $9.28 was the lowest point it dropped to. The percentage change in PRTA stock occurred in the recent session was 4.7% while the dollar amount for the price change in PRTA stock was $0.44.

PRTA's industry and sector of operation?

The NASDAQ listed PRTA is part of Biotechnology industry that operates in the broader Healthcare sector. Prothena Corporation plc designs, manufactures, and markets smartphones, personal computers, tablets, wearables, and accessories worldwide.

Who are the executives of PRTA?

Ms. Carol D. Karp
Chief Regulatory Officer
Dr. Hideki Garren M.D., Ph.D.
Chief Medical Officer
Ms. Karin L. Walker CPA, CPA
Chief Accounting Officer & Controller
Ms. Jennifer Zibuda
Director of Investor Relations & Communication
Mr. Brandon S. Smith
Chief Operating Officer
Mr. Michael J. Malecek
Chief Legal Officer & Company Sec.
Dr. Gene G. Kinney Ph.D.
Pres, Chief Executive Officer & Director
Dr. Wagner M. Zago
Chief Scientific Officer
Ms. Yvonne M. Tchrakian
Company Sec.
Mr. Tran B. Nguyen M.B.A.
Chief Financial Officer & Chief Strategy Officer

How PRTA did perform over past 52-week?

PRTA's closing price is 114.12% higher than its 52-week low of $4.32 where as its distance from 52-week high of $16.67 is -44.49%.

How many employees does PRTA have?

Number of PRTA employees currently stands at 163.

Link for PRTA official website?

Official Website of PRTA is: https://www.prothena.com

How do I contact PRTA?

PRTA could be contacted at phone 353 123 62500 and can also be accessed through its website. PRTA operates from 77 Sir John Rogerson’s Quay, Dublin, 2, Ireland.

How many shares of PRTA are traded daily?

PRTA stock volume for the day was 408.59K shares. The average number of PRTA shares traded daily for last 3 months was 629.34K.

What is the market cap of PRTA currently?

The market value of PRTA currently stands at $521.34M with its latest stock price at $9.69 and 53.83M of its shares outstanding.

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Employees	163
Beta	-0.1
Sales or Revenue	$91.37M
5Y Sales Change%	70.122%
Fiscal Year Ends	December
Sector	Healthcare
Industry	Biotechnology

Employees	163
Beta	-0.1
Sales or Revenue	$91.37M
5Y Sales Change%	70.122%
Fiscal Year Ends	December
Sector	Healthcare
Industry	Biotechnology

PRTA Company Profile and Key Details

Prothena

Price Chart

Stock Price Today

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Current Report (8-k)

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About Company

Company Information

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Price Chart

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Current Report (8-k)

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Stock Price History Chart

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About Company

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