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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
Sep 21, 2026 (view filing)4:23 PM ETSep 183 daysScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+100.0K$8.43+$843.5K+12.1%927.0K after
Sep 3, 2026 (view filing)6:23 PM ETSep 21 dayScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+27.0K$9.47+$255.7K+3.4%827.0K after
Aug 21, 2026 (view filing)2:32 PM ETAug 201 dayScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+50.0K$8.79+$439.4K+6.7%800.0K after
Aug 10, 2026 (view filing)3:24 PM ETAug 73 daysScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+34.0K$8.62+$293.1K+4.5%790.0K after
Aug 10, 2026 (view filing)3:24 PM ETAug 73 daysScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+3.50K$8.62+$30.2K+4.4%83.5K after
Jul 30, 2026 (view filing)8:31 PM ETJul 291 dayKingston Anne EvansChief Strategy OfficerSSaleOrdinary Shares, par value $0.01 per share−7.66K$8.47−$64.9K−12.1%55.8K after10b5-1
Jul 30, 2026 (view filing)8:30 PM ETJul 291 dayIsaacs Michael JohnGeneral Counsel & Company Sec.SSaleOrdinary Shares, par value $0.01 per share−8.39K$8.47−$71.1K−19.0%35.7K after10b5-1
Jun 18, 2026 (view filing)Jun 162 daysScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+20.0K$7.90+$158.0K+2.7%756.0K after
Jun 12, 2026 (view filing)Jun 111 dayScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+125.0K$8.17+$1.02M+13.4%1.06M after
Jun 5, 2026 (view filing)Jun 41 dayScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+50.0K$9.31+$465.5K+5.6%936.0K after
Jun 3, 2026 (view filing)Jun 21 dayScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+50.0K$9.43+$471.5K+6.0%886.0K after
May 26, 2026 (view filing)May 224 daysScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+100.0K$9.81+$981.0K+13.6%836.0K after
May 6, 2025 (view filing)May 2-64 daysEcoR1 Capital, LLC10% OwnerSSale−6.28M$8.09−$50.8M−54.2%5.30M after3 lots
May 2, 2025 (view filing)Dec 18, 2024-Jan 14, 2025135 daysLateScully William P10% OwnerPPurchaseOrdinary Shares, par value $0.01 per share+207.4K$13.26+$2.75M+39.2%736.0K after6 lots
Jan 24, 2024 (view filing)Jan 24Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$34.00−$170.0K−100.0%0 after10b5-1
Dec 20, 2023 (view filing)Dec 20Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$37.19−$186.0K−100.0%0 after2 lots10b5-1
Nov 30, 2023 (view filing)Nov 30Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$34.00−$170.0K−100.0%0 after10b5-1
Oct 25, 2023 (view filing)Oct 25Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$41.04−$205.2K−100.0%0 after3 lots10b5-1
Oct 11, 2023 (view filing)Oct 11Same daySmith Brandon S.Chief Operating OfficerSSaleOrdinary Shares, par value $0.01 per share−4.00K$46.74−$187.0K−100.0%0 after2 lots10b5-1
Oct 4, 2023 (view filing)Oct 4Same dayKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$46.61−$233.1K−100.0%0 after2 lots10b5-1
Sep 27, 2023 (view filing)Sep 27Same dayMalecek Michael JChief Legal OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$47.37−$236.9K−100.0%0 after2 lots10b5-1
Sep 19, 2023 (view filing)Sep 19Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$52.36−$261.8K−100.0%0 after10b5-1
Sep 13, 2023 (view filing)Sep 13Same dayGarren HidekiChief Medical OfficerSSaleOrdinary Shares, par value $0.01 per share−2.00K$55.48−$111.0K−100.0%0 after10b5-1
Sep 13, 2023 (view filing)Sep 13Same daySmith Brandon S.Chief Operating OfficerSSaleOrdinary Shares, par value $0.01 per share−4.00K$55.49−$222.0K−100.0%0 after2 lots10b5-1
Sep 6, 2023 (view filing)Sep 6Same dayKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$54.76−$273.8K−100.0%0 after2 lots10b5-1
Aug 30, 2023 (view filing)Aug 30Same dayMalecek Michael JChief Legal OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$55.02−$275.1K−100.0%0 after3 lots10b5-1
Aug 18, 2023 (view filing)Aug 18Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$57.18−$285.9K−100.0%0 after10b5-1
Aug 16, 2023 (view filing)Aug 16Same dayGarren HidekiChief Medical OfficerSSaleOrdinary Shares, par value $0.01 per share−2.00K$58.74−$117.5K−100.0%0 after3 lots10b5-1
Aug 16, 2023 (view filing)Aug 16Same daySmith Brandon S.Chief Operating OfficerSSaleOrdinary Shares, par value $0.01 per share−4.00K$58.71−$234.8K−100.0%0 after3 lots10b5-1
Aug 2, 2023 (view filing)Aug 2Same dayZago Wagner M.Chief Scientific OfficerSSaleOrdinary Shares, par value $0.01 per share−4.00K$67.04−$268.2K−100.0%0 after2 lots10b5-1
Aug 2, 2023 (view filing)Aug 2Same dayKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$67.02−$335.1K−100.0%0 after2 lots10b5-1
Jul 26, 2023 (view filing)Jul 26Same dayMalecek Michael JChief Legal OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$62.33−$311.6K−100.0%0 after3 lots10b5-1
Jul 19, 2023 (view filing)Jul 19Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$69.19−$346.0K−100.0%0 after2 lots10b5-1
Jul 12, 2023 (view filing)Jul 12Same dayGarren HidekiChief Medical OfficerSSaleOrdinary Shares, par value $0.01 per share−2.00K$67.51−$135.0K−100.0%0 after2 lots10b5-1
Jul 12, 2023 (view filing)Jul 12Same daySmith Brandon S.Chief Operating OfficerSSaleOrdinary Shares, par value $0.01 per share−4.00K$67.51−$270.0K−100.0%0 after2 lots10b5-1
Jul 5, 2023 (view filing)Jul 5Same dayKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$68.13−$340.6K−100.0%0 after2 lots10b5-1
Jul 5, 2023 (view filing)Jul 5Same dayZago Wagner M.Chief Scientific OfficerSSaleOrdinary Shares, par value $0.01 per share−4.00K$68.16−$272.6K−100.0%0 after2 lots10b5-1
Jul 3, 2023 (view filing)Jul 3Same daySelkoe Dennis J.DirectorSSaleOrdinary Shares, par value $0.01 per share−5.00K$67.43−$337.1K−63.7%2.85K after10b5-1
Jun 28, 2023 (view filing)Jun 28Same dayMalecek Michael JChief Legal OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$69.82−$349.1K−100.0%0 after3 lots10b5-1
Jun 20, 2023 (view filing)Jun 20Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$68.90−$344.5K−100.0%0 after3 lots10b5-1
Jun 16, 2023 (view filing)Jun 16Same dayGarren HidekiChief Medical OfficerSSaleOrdinary Shares, par value $0.01 per share−7.33K$74.00−$542.5K−100.0%0 after10b5-1
Jun 14, 2023 (view filing)Jun 14Same daySmith Brandon S.Chief Operating OfficerSSaleOrdinary Shares, par value $0.01 per share−5.33K$73.98−$394.6K−100.0%0 after4 lots10b5-1
Jun 14, 2023 (view filing)Jun 14Same dayGarren HidekiChief Medical OfficerSSaleOrdinary Shares, par value $0.01 per share−4.67K$74.22−$346.5K−100.0%0 after4 lots10b5-1
Jun 7, 2023 (view filing)Jun 7Same dayZago Wagner M.Chief Scientific OfficerSSaleOrdinary Shares, par value $0.01 per share−19.0K$71.06−$1.35M−100.0%0 after4 lots10b5-1
Jun 7, 2023 (view filing)Jun 7Same dayKarp Carol D.Chief Regulatory OfficerSSaleOrdinary Shares, par value $0.01 per share−20.0K$71.05−$1.42M−100.0%0 after4 lots10b5-1
May 31, 2023 (view filing)May 31Same dayMalecek Michael JChief Legal OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$64.64−$323.2K−100.0%0 after3 lots10b5-1
May 19, 2023 (view filing)May 19Same dayWalker Karin LChief Accounting OfficerSSaleOrdinary Shares, par value $0.01 per share−5.00K$74.00−$370.0K−100.0%0 after2 lots10b5-1
May 17, 2023 (view filing)May 17Same dayKinney Gene G.President and CEOSSaleOrdinary Shares, par value $0.01 per share−45.0K$73.69−$3.32M−77.9%12.8K after3 lots10b5-1
May 17, 2023 (view filing)May 17Same dayNguyen TranChief Strategy Officer and CFOSSaleOrdinary Shares, par value $0.01 per share−95.0K$73.99−$7.03M−96.7%3.20K after5 lots10b5-1
May 5, 2023 (view filing)May 32 daysSelkoe Dennis J.DirectorSSaleOrdinary Shares, par value $0.01 per share−15.0K$57.00−$855.0K−84.1%2.85K after10b5-1