Prothena Corp Public Ltd Co (PRTA) Insider Ownership

Historic Ownership Trends

Based on data from the past 90 days ending December 12, 2025, Prothena Corp Public's three largest insider shareholders are TenPercentOwner Capital, Llc Ecor1 (5.30Mn shares), President And CEO Gene G. Kinney (152.79K shares), Chief Operating Officer Brandon S. Smith (130.00K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
Capital, Llc Ecor1 5,304,596 06 May, 2025
Gene G. Kinney President And CEO 152,793 30 Jul, 2025
Brandon S. Smith Chief Operating Officer 130,000 30 Jul, 2025
Tran Nguyen Chief Strategy Officer And Cfo 97,205 30 Jul, 2025
Chad J. Swanson Chief Development Officer 85,000 30 Jul, 2025
Wagner M. Zago Chief Scientific Officer 85,000 30 Jul, 2025
Michael J Malecek Chief Legal Officer 80,000 30 Jul, 2025
Karin L Walker Chief Accounting Officer 25,000 30 Jul, 2025
Dennis J. Selkoe 2,845 03 Jul, 2023
Richard T Collier 1,219 05 Jan, 2023
Lars Ekman 243 05 Jan, 2023

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
28 Jul, 2025 Tran Nguyen Ordinary Shares, par value $0.01 per share A 95,000 $0.00 97,205 D A
28 Jul, 2025 Karin L Walker Ordinary Shares, par value $0.01 per share A 25,000 $0.00 25,000 D A
28 Jul, 2025 Wagner M. Zago Ordinary Shares, par value $0.01 per share A 85,000 $0.00 85,000 D A
28 Jul, 2025 Gene G. Kinney Ordinary Shares, par value $0.01 per share A 140,000 $0.00 152,793 D A
28 Jul, 2025 Chad J. Swanson Ordinary Shares, par value $0.01 per share A 85,000 $0.00 85,000 D A
28 Jul, 2025 Michael J Malecek Ordinary Shares, par value $0.01 per share A 80,000 $0.00 80,000 D A
28 Jul, 2025 Brandon S. Smith Ordinary Shares, par value $0.01 per share A 130,000 $0.00 130,000 D A
02 May, 2025 Capital, Llc Ecor1 - - 8,266,342 I
02 May, 2025 Capital, Llc Ecor1 Ordinary Shares D 3,317,938 $8.36 8,266,342 I S
05 May, 2025 Capital, Llc Ecor1 - - 7,288,649 I
05 May, 2025 Capital, Llc Ecor1 Ordinary Shares D 977,693 $8.11 7,288,649 I S
06 May, 2025 Capital, Llc Ecor1 - - 5,304,596 I
06 May, 2025 Capital, Llc Ecor1 Ordinary Shares D 1,984,053 $7.64 5,304,596 I S
24 Jan, 2024 Karin L Walker - - 5,000 D
24 Jan, 2024 Karin L Walker Ordinary Shares, par value $0.01 per share A 5,000 $13.53 5,000 D M
24 Jan, 2024 Karin L Walker Ordinary Shares, par value $0.01 per share D 5,000 $34.00 0 D S
24 Jan, 2024 Karin L Walker - - 0 D
20 Dec, 2023 Karin L Walker Ordinary Shares, par value $0.01 per share A 5,000 $13.53 5,000 D M
20 Dec, 2023 Karin L Walker Ordinary Shares, par value $0.01 per share D 1,678 $36.68 3,322 D S
20 Dec, 2023 Karin L Walker Ordinary Shares, par value $0.01 per share D 3,322 $37.45 0 D S