Prothena Corp Public Ltd Co (PRTA) Insider Ownership

Historic Insider Ownership Trends

PRTA's three largest insider shareholders as of April 17, 2026 are Capital, Llc Ecor1 (TenPercentOwner, 11.58Mn shares), Capital, Llc Ecor1 (TenPercentOwner, 11.58Mn shares), Capital, Llc Ecor1 (TenPercentOwner, 5.30Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Capital, Llc Ecor1 - 0 11,584,280 06 May, 2022
Capital, Llc Ecor1 - 0 11,584,280 12 Jan, 2022
Capital, Llc Ecor1 - 0 5,304,596 06 May, 2025
Gene G. Kinney President And Ceo 152,793 0 30 Jul, 2025
Brandon S. Smith Chief Operating Officer 130,000 0 30 Jul, 2025
Brandon S. Smith Chief Operating Officer 130,000 0 30 Jul, 2025
Tran Nguyen Chief Strategy Officer And Cfo 97,205 0 30 Jul, 2025
Chad J. Swanson Chief Development Officer 85,000 0 30 Jul, 2025
Wagner M. Zago Chief Scientific Officer 85,000 0 30 Jul, 2025
Chad J. Swanson Chief Development Officer 85,000 0 30 Jul, 2025
Wagner M. Zago Chief Scientific Officer 85,000 0 30 Jul, 2025
Michael J Malecek Chief Legal Officer 80,000 0 30 Jul, 2025
Karin L Walker Chief Accounting Officer 25,000 0 30 Jul, 2025
Karin L Walker Chief Accounting Officer 25,000 0 30 Jul, 2025
Dennis J. Selkoe - 2,845 0 03 Jul, 2023
Dennis J. Selkoe - 2,845 0 03 Jul, 2023
Richard T Collier - 1,219 0 05 Jan, 2023
Lars Ekman - 243 0 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
10 Apr, 2026 Anne Evans Kingston Stock Option (Right to Buy) A 100,000 $0.00 100,000 D A
03 Mar, 2026 Brandon S. Smith Stock Option (Right to Buy) A 190,000 $0.00 190,000 D A
03 Mar, 2026 Tran Nguyen Stock Option (Right to Buy) A 230,000 $0.00 230,000 D A
03 Mar, 2026 Gene G. Kinney Stock Option (Right to Buy) A 520,000 $0.00 520,000 D A
03 Mar, 2026 Wagner M. Zago Stock Option (Right to Buy) A 190,000 $0.00 190,000 D A
03 Mar, 2026 Karin L Walker Stock Option (Right to Buy) A 150,000 $0.00 150,000 D A
03 Mar, 2026 Chad J. Swanson Stock Option (Right to Buy) A 190,000 $0.00 190,000 D A
03 Mar, 2026 Michael J Malecek Stock Option (Right to Buy) A 190,000 $0.00 190,000 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 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 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 Brandon S. Smith Ordinary Shares, par value $0.01 per share A 130,000 $0.00 130,000 D A
14 May, 2025 Richard T Collier Stock Option (Right to Buy) A 20,183 $0.00 20,183 D A
14 May, 2025 William H. Jr. Dunn Stock Option (Right to Buy) A 20,183 $0.00 20,183 D A
14 May, 2025 Helen Susan Kim Stock Option (Right to Buy) A 20,183 $0.00 20,183 D A
14 May, 2025 Lars Ekman Stock Option (Right to Buy) A 20,183 $0.00 20,183 D A
14 May, 2025 Dennis J. Selkoe Stock Option (Right to Buy) A 20,183 $0.00 20,183 D A