PROTHENA CORP PUBLIC LTD CO (PRTA)

Latest Insider Confidence Score

2026Q1

49.9
Bearish

Company insider confidence (by quarter)

2012Q4 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Nodelman Oleg — 9,426,640 Dec 13, 2019
EcoR1 Capital, LLC 10% Owner 5,304,596 May 6, 2025
Scully William P 10% Owner 1,037,207 May 1, 2025
Kinney Gene G. CEO 152,793 Jul 30, 2025
Smith Brandon S. COO 130,000 Jul 30, 2025

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Mar 3, 2026 Mar 5, 2026 Zago Wagner M. Chief Scientific Officer Neutral 52.5 - 0.00% ✗ -
Mar 3, 2026 Mar 5, 2026 Walker Karin L Chief Accounting Officer Neutral 52.5 - 0.00% ✗ -
Mar 3, 2026 Mar 5, 2026 Swanson Chad J. Chief Development Officer Neutral 52.5 - 0.00% ✗ -
Mar 3, 2026 Mar 5, 2026 Smith Brandon S. COO Neutral 52.5 - 0.00% ✗ -
Mar 3, 2026 Mar 5, 2026 Nguyen Tran CFO Neutral 52.5 - 0.00% ✗ -
Mar 3, 2026 Mar 5, 2026 Malecek Michael J Chief Legal Officer Neutral 52.5 - 0.00% ✗ -
Mar 3, 2026 Mar 5, 2026 Kinney Gene G. CEO Neutral 52.5 - 0.00% ✗ -
Jul 28, 2025 Jul 30, 2025 Zago Wagner M. Chief Scientific Officer Neutral 90.0 +85,000 100.00% ✗ -
Jul 28, 2025 Jul 30, 2025 Walker Karin L Chief Accounting Officer Neutral 90.0 +25,000 100.00% ✗ -
Jul 28, 2025 Jul 30, 2025 Swanson Chad J. Chief Development Officer Neutral 90.0 +85,000 100.00% ✗ -
Jul 28, 2025 Jul 30, 2025 Smith Brandon S. COO Neutral 90.0 +130,000 100.00% ✗ -
Jul 28, 2025 Jul 30, 2025 Nguyen Tran CFO Neutral 90.0 +95,000 4308.39% ✗ -
Jul 28, 2025 Jul 30, 2025 Malecek Michael J Chief Legal Officer Neutral 90.0 +80,000 100.00% ✗ -
Jul 28, 2025 Jul 30, 2025 Kinney Gene G. CEO Neutral 90.0 +140,000 1094.35% ✗ -
May 14, 2025 May 16, 2025 WELCH DANIEL G Director Neutral 52.5 - 0.00% ✗ -
May 14, 2025 May 16, 2025 Selkoe Dennis J. Director Neutral 52.5 - 0.00% ✗ -
May 14, 2025 May 16, 2025 Kim Helen Susan Director Neutral 52.5 - 0.00% ✗ -
May 14, 2025 May 16, 2025 Ekman Lars Director Neutral 52.5 - 0.00% ✗ -
May 14, 2025 May 16, 2025 Dunn William H. Jr. Director Neutral 52.5 - 0.00% ✗ -
May 14, 2025 May 16, 2025 Cooke Shane Director Neutral 52.5 - 0.00% ✗ -
May 14, 2025 May 16, 2025 COLLIER RICHARD T Director Neutral 52.5 - 0.00% ✗ -
May 14, 2025 May 16, 2025 Cobb Paula K Director Neutral 52.5 - 0.00% ✗ -
May 2, 2025 May 6, 2025 EcoR1 Capital, LLC 10% Owner Sell 15.0 -6,279,684 -54.21% ✗ $50.8M
Dec 18, 2024 May 2, 2025 SCULLY WILLIAM P 10% Owner Buy 17.5 -110,264 -10.63% ✗ $2.7M
May 1, 2025 SCULLY WILLIAM P 10% Owner Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Zago Wagner M. Chief Scientific Officer Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Walker Karin L Chief Accounting Officer Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Swanson Chad J. Chief Development Officer Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Smith Brandon S. COO Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Nguyen Tran CFO Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Malecek Michael J Chief Legal Officer Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Kinney Gene G. CEO Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Karp Carol D. Chief Regulatory Officer Neutral 52.5 - 0.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Ford David A Chief People Officer Neutral 52.5 - 0.00% ✗ -
Apr 8, 2020 Feb 14, 2025 Nguyen Tran CFO Neutral 27.5 -995 -31.09% ✗ -
Oct 1, 2024 Oct 3, 2024 Swanson Chad J. Chief Development Officer Neutral 52.5 - 0.00% ✗ -
Oct 3, 2024 Swanson Chad J. Chief Development Officer Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 WELCH DANIEL G Director Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 Selkoe Dennis J. Director Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 Kim Helen Susan Director Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 Ekman Lars Director Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 Dunn William H. Jr. Director Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 Cooke Shane Director Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 COLLIER RICHARD T Director Neutral 52.5 - 0.00% ✗ -
May 15, 2024 May 17, 2024 Cobb Paula K Director Neutral 52.5 - 0.00% ✗ -
Mar 1, 2024 Mar 5, 2024 Ford David A Chief People Officer Neutral 52.5 - 0.00% ✗ -
Mar 5, 2024 Ford David A Chief People Officer Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Zago Wagner M. Chief Scientific Officer Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Walker Karin L Chief Accounting Officer Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Smith Brandon S. COO Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Nguyen Tran CFO Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Malecek Michael J Chief Legal Officer Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Kinney Gene G. CEO Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Karp Carol D. Chief Regulatory Officer Neutral 52.5 - 0.00% ✗ -
Feb 27, 2024 Feb 29, 2024 Garren Hideki Chief Medical Officer Neutral 52.5 - 0.00% ✗ -
Feb 21, 2024 Feb 23, 2024 WELCH DANIEL G Director Neutral 52.5 - 0.00% ✗ -
Feb 23, 2024 WELCH DANIEL G Director Neutral 52.5 - 0.00% ✗ -
Jan 24, 2024 Jan 24, 2024 Walker Karin L Chief Accounting Officer Sell 10.0 -5,000 -100.00% ✓ $170K
Dec 20, 2023 Dec 20, 2023 Walker Karin L Chief Accounting Officer Sell 10.0 -5,000 -100.00% ✓ $186K
Nov 30, 2023 Nov 30, 2023 Walker Karin L Chief Accounting Officer Sell 10.0 -5,000 -100.00% ✓ $170K
Oct 25, 2023 Oct 25, 2023 Walker Karin L Chief Accounting Officer Sell 10.0 -5,000 -100.00% ✓ $205.2K
Oct 11, 2023 Oct 11, 2023 Smith Brandon S. COO Sell 10.0 -4,000 -100.00% ✓ $187K
Oct 4, 2023 Oct 4, 2023 Karp Carol D. Chief Regulatory Officer Sell 10.0 -5,000 -100.00% ✓ $233.1K
Sep 27, 2023 Sep 27, 2023 Malecek Michael J Chief Legal Officer Sell 10.0 -5,000 -100.00% ✓ $236.9K
Sep 19, 2023 Sep 19, 2023 Walker Karin L Chief Accounting Officer Sell 7.5 -5,000 -100.00% ✓ $261.8K
Sep 13, 2023 Sep 13, 2023 Garren Hideki Chief Medical Officer Sell 10.0 -2,000 -100.00% ✓ $111K
Sep 13, 2023 Sep 13, 2023 Smith Brandon S. COO Sell 10.0 -4,000 -100.00% ✓ $222K
Sep 6, 2023 Sep 6, 2023 Karp Carol D. Chief Regulatory Officer Sell 7.5 -5,000 -100.00% ✓ $273.8K
Aug 30, 2023 Aug 30, 2023 Malecek Michael J Chief Legal Officer Sell 7.5 -5,000 -100.00% ✓ $275.1K
Aug 18, 2023 Aug 18, 2023 Walker Karin L Chief Accounting Officer Sell 7.5 -5,000 -100.00% ✓ $285.9K
Aug 16, 2023 Aug 16, 2023 Garren Hideki Chief Medical Officer Sell 10.0 -2,000 -100.00% ✓ $117.5K
Aug 16, 2023 Aug 16, 2023 Smith Brandon S. COO Sell 10.0 -4,000 -100.00% ✓ $234.8K
Aug 2, 2023 Aug 2, 2023 Zago Wagner M. Chief Scientific Officer Sell 7.5 -4,000 -100.00% ✓ $268.2K
Aug 2, 2023 Aug 2, 2023 Karp Carol D. Chief Regulatory Officer Sell 7.5 -5,000 -100.00% ✓ $335.1K
Jul 26, 2023 Jul 26, 2023 Malecek Michael J Chief Legal Officer Sell 7.5 -5,000 -100.00% ✓ $311.6K
Jul 19, 2023 Jul 19, 2023 Walker Karin L Chief Accounting Officer Sell 7.5 -5,000 -100.00% ✓ $345.9K
Jul 12, 2023 Jul 12, 2023 Garren Hideki Chief Medical Officer Sell 10.0 -2,000 -100.00% ✓ $135K
Jul 12, 2023 Jul 12, 2023 Smith Brandon S. COO Sell 7.5 -4,000 -100.00% ✓ $270K
Jul 5, 2023 Jul 5, 2023 Karp Carol D. Chief Regulatory Officer Sell 7.5 -5,000 -100.00% ✓ $340.6K
Jul 5, 2023 Jul 5, 2023 Zago Wagner M. Chief Scientific Officer Sell 7.5 -4,000 -100.00% ✓ $272.6K
Jul 3, 2023 Jul 3, 2023 Selkoe Dennis J. Director Sell 7.5 -5,000 -54.30% ✓ $337.2K
Jun 28, 2023 Jun 28, 2023 Malecek Michael J Chief Legal Officer Sell 7.5 -5,000 -100.00% ✓ $349.1K
Jun 20, 2023 Jun 20, 2023 Walker Karin L Chief Accounting Officer Sell 7.5 -5,000 -100.00% ✓ $344.5K
Jun 16, 2023 Jun 16, 2023 Garren Hideki Chief Medical Officer Sell 7.5 -7,331 -100.00% ✓ $542.5K
Jun 14, 2023 Jun 14, 2023 Smith Brandon S. COO Sell 7.5 -5,333 -100.00% ✓ $394.6K
Jun 14, 2023 Jun 14, 2023 Garren Hideki Chief Medical Officer Sell 7.5 -4,669 -100.00% ✓ $346.5K
Jun 7, 2023 Jun 7, 2023 Zago Wagner M. Chief Scientific Officer Sell 5.0 -19,000 -100.00% ✓ $1.4M
Jun 7, 2023 Jun 7, 2023 Karp Carol D. Chief Regulatory Officer Sell 5.0 -20,000 -100.00% ✓ $1.4M
May 31, 2023 May 31, 2023 Malecek Michael J Chief Legal Officer Sell 7.5 -5,000 -100.00% ✓ $323.2K
May 19, 2023 May 19, 2023 Walker Karin L Chief Accounting Officer Sell 7.5 -5,000 -100.00% ✓ $370K
May 17, 2023 May 19, 2023 Cooke Shane Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 19, 2023 Cobb Paula K Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 19, 2023 COLLIER RICHARD T Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 19, 2023 Dunn William H. Jr. Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 19, 2023 Ekman Lars Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 19, 2023 Harfstrand Karl Anders Olof Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 19, 2023 Kim Helen Susan Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 19, 2023 Selkoe Dennis J. Director Neutral 52.5 - 0.00% ✗ -
May 19, 2023 Dunn William H. Jr. Director Neutral 52.5 - 0.00% ✗ -
May 17, 2023 May 17, 2023 Kinney Gene G. CEO Sell 5.0 -45,000 -77.86% ✓ $3.3M