Prothena Corporation plc

PRTA.US
Healthcare · Biotechnology
8.56
-0.14 (-1.61%)
USD · NASDAQ
People

▼
Directors & Officers

Name	Title	Year Born
Dr. Gene G. Kinney Ph.D.	President, CEO & Director	1969
Mr. Tran B. Nguyen M.B.A.	Chief Financial Officer	1974
Mr. Brandon S. Smith	Chief Operating Officer	1975
Dr. Wagner M. Zago Ph.D.	Chief Scientific Officer	1973
Dr. Chad H. Swanson Ph.D.	Chief Development Officer	NA
Ms. Karin L. Walker CPA	Chief Accounting Officer & Controller	1963
Mr. Mark C. Johnson C.F.A.	Vice President of Investor Relations	NA
Mr. Michael J. Isaacs	General Counsel & Corporate Secretary	NA
Phillip Dolan	Sr. Director & Head of Exploratory Research	NA
Ms. Annie Evans Kingston	Chief Strategy Officer	NA
Insider Trading

Date	Insider Name	Title	Transaction Type	Shares	Price	Value
Jan 14, 2025	William P Scully	N/A	Purchase	100.00K	$12.79	$1.28M
Dec 31, 2024	William P Scully	N/A	Purchase	32.00K	$13.01	$416.32K
Dec 20, 2024	William P Scully	N/A	Purchase	2.00K	$15.91	$31.82K
Dec 18, 2024	William P Scully	N/A	Purchase	73.44K	$13.93	$1.02M
Jan 24, 2024	Karin L. Walker	N/A	Sale	5.00K	$34.00	$170.00K
Dec 20, 2023	Karin L. Walker	N/A	Sale	5.00K	$37.19	$185.95K
Nov 30, 2023	Karin L. Walker	N/A	Sale	5.00K	$34.00	$170.00K
Oct 25, 2023	Karin L. Walker	N/A	Sale	5.00K	$41.04	$205.20K
Oct 11, 2023	Brandon S. Smith	N/A	Sale	4.00K	$46.75	$187.00K
Oct 04, 2023	Carol D. Karp	N/A	Sale	5.00K	$46.62	$233.10K
Sep 27, 2023	Michael J. Malecek	N/A	Sale	5.00K	$47.38	$236.90K
Sep 19, 2023	Karin L. Walker	N/A	Sale	5.00K	$52.36	$261.80K
Sep 13, 2023	Brandon S. Smith	N/A	Sale	4.00K	$55.49	$221.96K
Sep 13, 2023	Hideki Garren	N/A	Sale	2.00K	$55.48	$110.96K
Sep 06, 2023	Carol D. Karp	N/A	Sale	5.00K	$54.76	$273.80K
Aug 30, 2023	Michael J. Malecek	N/A	Sale	5.00K	$55.01	$275.05K
Aug 18, 2023	Karin L. Walker	N/A	Sale	5.00K	$57.18	$285.90K
Aug 16, 2023	Hideki Garren	N/A	Sale	2.00K	$58.74	$117.48K
Aug 16, 2023	Brandon S. Smith	N/A	Sale	4.00K	$58.71	$234.84K
Aug 02, 2023	Wagner M. Zago	N/A	Sale	4.00K	$67.05	$268.20K
Shareholders

▼
Institutional Holders

Holder Name	Shares	Date Reported	% Out	Value	% Change
FMR Inc	7.55M	Mar 31, 2026	14.42%	$0.00	0.00%
Rubric Capital Management LP	5.00M	Mar 31, 2026	9.55%	$0.51	35.97%
BlackRock Inc	4.64M	Mar 31, 2026	8.87%	$0.00	13.07%
Vanguard Group Inc	2.14M	Dec 31, 2025	4.09%	$0.00	4.44%
State Street Corp	1.94M	Mar 31, 2026	3.70%	$0.00	-14.52%
D. E. Shaw & Co LP	1.76M	Mar 31, 2026	3.37%	$0.01	4.88%
ADAR1 Capital Management LLC	1.58M	Mar 31, 2026	3.02%	$0.90	8.48%
Acadian Asset Management LLC	1.55M	Mar 31, 2026	2.96%	$0.02	1,457.72%
Vanguard Portfolio Management, LLC	1.45M	Mar 31, 2026	2.76%	$0.00	0.00%
Morgan Stanley - Brokerage Accounts	1.23M	Mar 31, 2026	2.35%	$0.00	-1.31%
Palo Alto Investors, LLC	1.21M	Mar 31, 2026	2.31%	$1.80	-8.48%
Two Sigma Investments LLC	1.21M	Mar 31, 2026	2.30%	$0.01	79.96%
Geode Capital Management, LLC	1.10M	Mar 31, 2026	2.10%	$0.00	3.30%
Federated Hermes Inc	1.06M	Mar 31, 2026	2.02%	$0.02	8.77%
Jacobs Levy Equity Management, Inc.	972.02K	Mar 31, 2026	1.86%	$0.04	-0.61%
The Goldman Sachs Group Inc	818.89K	Mar 31, 2026	1.56%	$0.00	-12.45%
Dimensional Fund Advisors, Inc.	782.60K	Mar 31, 2026	1.49%	$0.00	0.95%
Nuveen, LLC	759.37K	Mar 31, 2026	1.45%	$0.00	0.03%
Qube Research & Technologies	614.60K	Mar 31, 2026	1.17%	$0.01	50.75%
Renaissance Technologies Corp	607.52K	Mar 31, 2026	1.16%	$0.01	39.49%
Fund Holdings

Rank	Holder Name	Shares Held	% of Shares	Change	Date Reported
1	Fidelity Growth Compy Commingled Pl S	3.43M	6.55%	▲ 0.04%	May 31, 2026
2	Fidelity Growth Company Fund	2.29M	4.38%	▲ 0.00%	May 31, 2026
3	State Street® SPDR® S&P® Biotech ETF	1.45M	2.77%	▼ 2.18%	Jun 30, 2026
4	iShares Russell 2000 ETF	1.17M	2.24%	▲ 0.60%	Jun 30, 2026
5	Fidelity Series Growth Company	758.91K	1.45%	▲ 0.00%	May 31, 2026
6	Vanguard Explorer Inv	617.22K	1.18%	▲ 0.00%	Mar 31, 2026
7	Fidelity Select Biotechnology	495.52K	0.95%	▲ 0.00%	May 31, 2026
8	Vanguard Institutional Extnd Mkt Idx Tr	479.95K	0.92%	▲ 0.05%	Jun 30, 2026
9	Nuveen Quant Small Cap Equity R6	451.23K	0.86%	▼ 30.81%	May 31, 2026
10	Fidelity Small Cap Index	433.68K	0.83%	▲ 0.72%	Apr 30, 2026
Financial Highlights

▼
Market Cap: $448.14M
EBITDA: $-92.33M
PEG Ratio: $0.80
Book Value: $5.89
Earnings/Share: $-2.76
Profit Margin: -260.92%
Operating Margin: 50.49%
ROA (TTM): -13.78%
ROE (TTM): -40.30%
Revenue (TTM): $57.94M
Revenue/Share (TTM): $1.08
Earnings Growth (YOY): 0.00%
Revenue Growth (YOY): 1,706.40%
Valuation Metrics

Enterprise Value: $133.67M
Trailing P/E: 0.00
Forward P/E: 10.63
Shares Statistics

Shares Outstanding: 52.35M
Shares Float: 36.68M
% Insiders: 2,018.20%
% Institutions: 9,075.90%
Short % Float: 18.78%
Stock Price History

▼
1 Year Price History

2 Years Price History

5 Years Price History

10 Years Price History

Financial Charts

▼
Download Financials (Excel)
Revenue & Net Income (Yearly)

Revenue & Net Income (Quarterly)

Operating Expenses (Yearly)

Operating Expenses (Quarterly)

Balance Sheet (Quarterly)

Assets Breakdown (Yearly)

Assets Breakdown (Quarterly)

Liabilities Breakdown (Yearly)

Liabilities Breakdown (Quarterly)

Income Statement Waterfall

▼
Line Item
Step Type
Value
Revenue
adjust
$9.68M
Cost of Goods Sold
adjust
$-3.70M
Gross Profit
subtotal
$5.98M
SG&A
adjust
$-59.39M
R&D
adjust
$-134.85M
Operating Income
subtotal
$-184.56M
Other / Non-Operating Items
adjust
$-59.53M
Net Income
subtotal
$-244.09M
Earnings Per Share (EPS) History

▼
Financial Ratios

▼
📦 Raw API Data (JSON Explorer)

▼
Comprehensive raw data returned from the EOD Fundamentals API. Expand sections below to drill down.
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}
Prothena Corporation plc

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