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Filing Details

Accession Number:: 0000935836-25-000309
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2025-05-06 19:06:05
Reporting Period:: 2025-05-02

Filing Date:: 2025-05-06
Accepted Time:: 2025-05-06 19:06:05
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1559053	Prothena Corp Public Ltd Co	PRTA	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1587114	Ecor1 Capital, Llc	357 Tehama Street #3 San Francisco CA 94103		No	No	Yes	No

Reported Non-Derivative Transactions

Show Other Fields >>

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Ordinary Shares	Disposition	2025-05-02	3,317,938	$8.36	8,266,342	No	4	S	Indirect	See Note
Ordinary Shares	Disposition	2025-05-05	977,693	$8.11	7,288,649	No	4	S	Indirect	See Note
Ordinary Shares	Disposition	2025-05-06	1,984,053	$7.64	5,304,596	No	4	S	Indirect	See Note

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Note
No	4	S	Indirect	See Note
No	4	S	Indirect	See Note

Footnotes

The reporting persons are EcoR1 Capital, LLC ("Ecor1"), Oleg Nodelman and EcoR1 Capital Fund Qualified, L.P. ("Qualified Fund"). EcoR1 is the general partner and investment adviser of private funds, including Qualified Fund (the "Fund"). Mr. Nodelman is the manager and controlling owner of EcoR1. EcoR1 is filing this Form 4 for itself, Mr. Nodelman and Qualified Fund. The filers are filing this Form 4 jointly, but not as a group, and each expressly disclaims membership in a group within the meaning of Rule 13d-5(b) under the Securities Exchange Act of 1934. The Funds hold these securities directly for the benefit of their investors. EcoR1 may be deemed to indirectly beneficially own them as the investment adviser to the Funds. Mr. Nodelman may be deemed to indirectly beneficially own them as the control person of EcoR1. The filers disclaim beneficial ownership of the securities except to the extent of their respective pecuniary interests therein.
Qualified Fund sold 3,097,619 of the shares sold in this transaction.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.2715 to $9.1789, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold at each seperate price within the ranges set forth in this footnote and footnotes 6 and 9.
After this transaction, Qualified Fund held 7,750,234 shares of the Issuer's Common Stock.
Qualified Fund sold 916,492 of the shares of sold in this transaction.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.1097 to $8.1972, inclusive.
After this transaction, Qualified Fund held 6,833,742 shares of the Issuer's Common Stock
Qualified Fund sold 1,859,851 of the shares sold in this transaction.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.4637 to $8.5939, inclusive.
After this transaction, Qualified Fund held 4,973,891 of the Issuer's Ordinary Shares.