Prothena Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of 0PT?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	4,516,784	7.81%
Hedge Funds	11,584,280	20%
Institutions	41,711,571	72.1%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 97.06% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
21.5%	EcoR1 Capital, LLC	11,584,280	€155.9m	0%	5.52%
15%	FMR LLC	8,066,976	€108.6m	0.02%	0.01%
10.8%	Wellington Management Group LLP	5,798,741	€78.0m	38.8%	0.01%
7.5%	William Scully	4,036,140	€54.3m	13.2%	no data
7.49%	BlackRock, Inc.	4,028,387	€54.2m	4.44%	no data
7.1%	T. Rowe Price Group, Inc.	3,822,434	€51.4m	-9.79%	no data
3.23%	Palo Alto Investors LP	1,737,964	€23.4m	4.3%	3.36%
3.11%	State Street Global Advisors, Inc.	1,674,909	€22.5m	-13.3%	no data
3.07%	Armistice Capital LLC	1,650,000	€22.2m	5.77%	0.55%
2.34%	The Vanguard Group, Inc.	1,259,101	€16.9m	7.46%	no data
2.04%	Artal Group S.A.	1,099,840	€14.8m	9.83%	0.45%
1.79%	Geode Capital Management, LLC	963,479	€13.0m	-3.1%	no data
1.59%	Dimensional Fund Advisors LP	854,050	€11.5m	-0.87%	no data
1.28%	Tavistock Life Sciences	690,000	€9.3m	0%	0.66%
1.16%	Rock Springs Capital Management LP	625,048	€8.4m	0%	0.29%
1.11%	Morgan Stanley, Investment Banking and Brokerage Investments	597,726	€8.0m	-9.42%	no data
1.1%	UBS Asset Management AG	589,254	€7.9m	571%	no data
0.9%	Prosight Management, LP	483,467	€6.5m	68.5%	1.76%
0.85%	Todd Fennell	458,981	€6.2m	77.4%	no data
0.81%	Finepoint Capital LP	433,471	€5.8m	0%	0.7%
0.75%	Federated Hermes, Inc.	404,903	€5.4m	823%	0.01%
0.69%	Northern Trust Global Investments	372,655	€5.0m	2.35%	no data
0.65%	Candriam, Société En Commandite Par Actions	348,187	€4.7m	0%	0.01%
0.6%	Charles Schwab Investment Management, Inc.	324,962	€4.4m	-0.67%	no data
0.6%	Mariner, LLC	323,213	€4.4m	63.2%	0.01%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/01/05 05:53
End of Day Share Price	2025/01/03 00:00
Earnings	2024/09/30
Annual Earnings	2023/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more here.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on .

Analyst Sources

Prothena Corporation plc is covered by 25 analysts. 9 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Geoffrey Meacham	Barclays
Tazeen Ahmad	BofA Global Research
null null	BTIG