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Prothena (PRTA) Insider Trading & Ownership

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$9.86 +0.26 (+2.71%)
Closing price 05/14/2026 04:00 PM Eastern
Extended Trading
$9.86 0.00 (-0.05%)
As of 05/14/2026 04:45 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.

Prothena (NASDAQ:PRTA) Insider Buying and Selling Activity

Current
Insider Ownership
Percentage
10.40%
Number Of
Insiders Buying
(Last 3 Years)
1
Amount Of
Insider Buying
(Last 3 Years)
$2.75M
Number Of
Insiders Selling
(Last 3 Years)
9
Amount Of
Insider Selling
(Last 3 Years)
$19.20M
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PRTA Insider Buying and Selling by Quarter

Prothena Insider and Congressional Trades History

Transaction DateInsiderBuy/SellNumber of SharesAverage Share PriceTotal TransactionDetails
1/14/2025
William P Scully
Major Shareholder
Buy100,000$12.79$1,279,000.00  
12/31/2024
William P Scully
Major Shareholder
Buy32,000$13.01$416,320.00  
12/20/2024
William P Scully
Major Shareholder
Buy2,000$15.91$31,820.00  
12/18/2024
William P Scully
Major Shareholder
Buy73,436$13.93$1,022,963.48  
1/24/2024Sell5,000$34.00$170,000.00  
12/20/2023Sell5,000$37.19$185,950.00  
11/30/2023Sell5,000$34.00$170,000.00  
10/25/2023Sell5,000$41.04$205,200.00  
10/11/2023Sell4,000$46.75$187,000.00  
10/4/2023Sell5,000$46.62$233,100.00  
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9/27/2023Sell5,000$47.38$236,900.00  
9/19/2023Sell5,000$52.36$261,800.00  
9/13/2023Sell4,000$55.49$221,960.00  
9/13/2023
Hideki Garren
insider
Sell2,000$55.48$110,960.00  
9/6/2023Sell5,000$54.76$273,800.00  
8/30/2023Sell5,000$55.01$275,050.00  
8/18/2023Sell5,000$57.18$285,900.00  
8/16/2023Sell4,000$58.71$234,840.00  
8/16/2023
Hideki Garren
insider
Sell2,000$58.74$117,480.00  
8/2/2023Sell4,000$67.05$268,200.00  
7/26/2023Sell5,000$62.33$311,650.00  
7/19/2023Sell5,000$69.19$345,950.00  
7/12/2023Sell4,000$67.51$270,040.00  
7/12/2023
Hideki Garren
insider
Sell2,000$67.51$135,020.00  
7/5/2023Sell5,000$68.13$340,650.00  
7/3/2023Sell5,000$67.43$337,150.00  
6/28/2023Sell5,000$69.82$349,100.00  
6/16/2023
Hideki Garren
insider
Sell7,331$74.00$542,494.00  
6/14/2023Sell5,333$73.98$394,535.34  
6/14/2023
Hideki Garren
insider
Sell4,669$74.22$346,533.18  
6/7/2023Sell19,000$71.06$1,350,140.00  
5/31/2023Sell5,000$64.64$323,200.00  
5/19/2023Sell5,000$74.00$370,000.00  
5/17/2023
Gene G Kinney
CEO
Sell45,000$73.70$3,316,500.00  
5/17/2023Sell95,000$73.99$7,029,050.00  
(Data available from 1/1/2013 forward)

PRTA Insider Trading Activity - Frequently Asked Questions

The list of insiders at Prothena includes Brandon S. Smith, Carol D. Karp, Dennis J Selkoe, Gene G Kinney, Hideki Garren, Karin L. Walker, Michael J. Malecek, Tran Nguyen, Wagner M. Zago, and William P Scully. Learn more on insiders at PRTA.

10.40% of Prothena stock is owned by insiders. Learn more on PRTA's insider holdings.

The following insider purchased PRTA shares in the last 24 months: William P Scully ($2,750,103.48).

Insiders have purchased a total of 207,436 PRTA shares in the last 24 months for a total of $2,750,103.48 bought.



This page (NASDAQ:PRTA) was last updated on 5/15/2026 by MarketBeat.com Staff.
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