Skip to main content

Prothena Corp Public Ltd Co

PRTA
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001559053

In the last 90 days, Prothena Corp Public Ltd Co insiders filed 4 open-market purchases and 2 sales; 187 institutions reported holding it in 13F filings for Q2 2026, worth $462.7M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Prothena Corp Public Ltd Co insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
4 filings
1 insider, $1.86M in total
Open-market sells
2 filings
2 insiders, $136.0K in total
Insiders trading
3
Net value
+$1.73M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Prothena Corp Public Ltd Co, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Prothena Corp Public Ltd Co
NameTitleLast reported holdingLast filingFilings, past year
Scully William P10% Owner927,000Sep 21, 202612
Zago Wagner M.Chief Scientific Officer34,000Jul 30, 20262
Walker Karin LChief Accounting Officer10,000Jul 30, 20262
Swanson Chad J.Chief Development Officer40,733Jul 30, 20262
Smith Brandon S.Chief Operating Officer52,000Jul 30, 20262
Nguyen TranChief Strategy Officer and CFO40,205Jul 30, 20262
Kinney Gene G.President and CEO68,793Jul 30, 20262
Kingston Anne EvansChief Strategy Officer55,782Jul 30, 20262
Isaacs Michael JohnGeneral Counsel & Company Sec.35,745Jul 30, 20261
Collier Richard TDirector1,219May 15, 20261
Welch Daniel GDirector–May 15, 20261
Ekman LarsDirector243May 15, 20261
Cooke ShaneDirector0May 15, 20261
Selkoe Dennis J.Director2,845May 15, 20261
Dunn William H. Jr.Director–May 15, 20261
Malecek Michael JChief Legal Officer80,000Mar 5, 20261
Kim Helen SusanDirector–May 16, 20250
Cobb Paula KDirector–May 16, 20250
EcoR1 Capital, LLC10% Owner5,304,596IndirectMay 6, 20250
Karp Carol D.Chief Regulatory Officer0Mar 7, 20250
Ford David AChief People Officer–Mar 7, 20250
Garren HidekiChief Medical Officer0Feb 29, 20240
Harfstrand Karl Anders OlofDirector–May 19, 20230
Patel SanjivDirector–May 27, 20220
Tripuraneni RadhikaChief Development Officer–Feb 25, 20220
Henney Christopher SDirector0Jul 16, 20210

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Apr 13, 2022 (view filing)Apr 112 daysCooke ShaneDirectorSSaleOrdinary Shares, par value $0.01 per share−5.00K$35.08−$175.4K−100.0%0 after3 lots
Apr 7, 2022 (view filing)Apr 52 daysCollier Richard TDirectorSSaleOrdinary Shares, par value $0.01 per share−5.00K$39.41−$197.0K−80.4%1.22K after2 lots
Jan 12, 2022 (view filing)Jan 12Same dayEcoR1 Capital, LLC10% OwnerPPurchase+300.0K$37.50+$11.3M+2.7%11.6M after
Jan 5, 2022 (view filing)Jan 32 daysSelkoe Dennis J.DirectorSSaleOrdinary Shares, par value $0.01 per share−5.00K$47.45−$237.2K−63.7%2.85K after3 lots
Nov 26, 2021 (view filing)Nov 233 daysWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−4.52K$57.88−$261.6K−100.0%0 after2 lots
Nov 19, 2021 (view filing)Nov 19Same dayMalecek Michael JSee RemarksSSaleOrdinary Shares, par value $0.01 per share−10.0K$55.00−$550.0K−100.0%0 after
Nov 3, 2021 (view filing)Nov 12 daysKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−10.0K$57.18−$571.8K−100.0%0 after3 lots
Oct 29, 2021 (view filing)Oct 272 daysMalecek Michael JSee RemarksSSaleOrdinary Shares, par value $0.01 per share−10.0K$58.52−$585.2K−100.0%0 after4 lots
Oct 22, 2021 (view filing)Oct 202 daysWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−23.0K$60.25−$1.39M−100.0%0 after3 lots
Oct 1, 2021 (view filing)Oct 1Same daySelkoe Dennis J.DirectorSSaleOrdinary Shares, par value $0.01 per share−5.00K$67.83−$339.2K−63.7%2.85K after4 lots
Oct 1, 2021 (view filing)Oct 1Same dayKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−10.0K$68.24−$682.4K−100.0%0 after5 lots
Sep 10, 2021 (view filing)Sep 91 dayKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−10.0K$71.99−$719.9K−100.0%0 after2 lots
Jul 30, 2021 (view filing)Jul 30Same daySelkoe Dennis J.DirectorSSaleOrdinary Shares, par value $0.01 per share−5.00K$49.47−$247.4K−63.7%2.85K after2 lots
Jul 16, 2021 (view filing)Jul 142 daysHenney Christopher SDirectorSSaleOrdinary Shares, par value $0.01 per share−11.1K$55.46−$616.0K−100.0%0 after2 lots
Jul 13, 2021 (view filing)Jul 121 dayHenney Christopher SDirectorSSaleOrdinary Shares, par value $0.01 per share−23.9K$55.50−$1.33M−100.0%0 afterAmended13 lots