PRTA

Prothena Corp Public Ltd Co

Insider trading activity for Prothena Corp Public Ltd Co, straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

+$1.7M

net buying

Bought(5 · 1 insiders): $1.9M
Sold(2 · 2 insiders): $136K

Past 6 months

+$4.8M

net buying

Bought(10 · 1 insiders): $5M
Sold(2 · 2 insiders): $136K

Past 12 months

+$4.8M

net buying

Bought(10 · 1 insiders): $5M
Sold(2 · 2 insiders): $136K

Transaction history

The 80 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Sep 18	Scully William P	10% Owner	PBUY	100,000	$8.43	$843.5K	+12.1%	Open the original filing on SEC.gov
Sep 2	Scully William P	10% Owner	PBUY	27,000	$9.47	$255.7K	+3.4%	Open the original filing on SEC.gov
Aug 20	Scully William P	10% Owner	PBUY	50,000	$8.79	$439.4K	+6.7%	Open the original filing on SEC.gov
Aug 10	Scully William P	10% Owner	GGIFT	251,553	—	—	+31.8%	Open the original filing on SEC.gov
Aug 7	Scully William P	10% Owner	PBUY	3,500	$8.62	$30.2K	+4.4%	Open the original filing on SEC.gov
Aug 7	Scully William P	10% Owner	PBUY	34,000	$8.62	$293.1K	+4.5%	Open the original filing on SEC.gov
Jul 29	Kingston Anne Evans	Chief Strategy Officer	SSELL◷	7,662	$8.47	$64.9K	-12.1%	Open the original filing on SEC.gov
Jul 29	Isaacs Michael John	General Counsel &…	SSELL◷	8,386	$8.47	$71.1K	-19.0%	Open the original filing on SEC.gov
Jul 28	Zago Wagner M.	Chief Scientific Officer	MEXER◆	51,000	—	—	—	Open the original filing on SEC.gov
Jul 28	Zago Wagner M.	Chief Scientific Officer	DTOISS	51,000	$8.56	$436.6K	-60.0%	Open the original filing on SEC.gov
Jul 28	Zago Wagner M.	Chief Scientific Officer	MEXER	51,000	—	—	+150.0%	Open the original filing on SEC.gov
Jul 28	Walker Karin L	Chief Accounting Officer	MEXER◆	15,000	—	—	—	Open the original filing on SEC.gov
Jul 28	Walker Karin L	Chief Accounting Officer	DTOISS	15,000	$8.56	$128.4K	-60.0%	Open the original filing on SEC.gov
Jul 28	Walker Karin L	Chief Accounting Officer	MEXER	15,000	—	—	+150.0%	Open the original filing on SEC.gov
Jul 28	Swanson Chad J.	Chief Development…	MEXER◆	51,000	—	—	—	Open the original filing on SEC.gov
Jul 28	Swanson Chad J.	Chief Development…	FTAX	3,467	$8.56	$29.7K	-7.8%	Open the original filing on SEC.gov
Jul 28	Swanson Chad J.	Chief Development…	DTOISS	40,800	$8.56	$349.2K	-48.0%	Open the original filing on SEC.gov
Jul 28	Swanson Chad J.	Chief Development…	MEXER	51,000	—	—	+150.0%	Open the original filing on SEC.gov
Jul 28	Smith Brandon S.	Chief Operating Officer	MEXER◆	78,000	—	—	—	Open the original filing on SEC.gov
Jul 28	Smith Brandon S.	Chief Operating Officer	DTOISS	78,000	$8.56	$667.7K	-60.0%	Open the original filing on SEC.gov
Jul 28	Smith Brandon S.	Chief Operating Officer	MEXER	78,000	—	—	+150.0%	Open the original filing on SEC.gov
Jul 28	Nguyen Tran	Chief Strategy Officer…	MEXER◆	57,000	—	—	—	Open the original filing on SEC.gov
Jul 28	Nguyen Tran	Chief Strategy Officer…	DTOISS	57,000	$8.56	$487.9K	-58.6%	Open the original filing on SEC.gov
Jul 28	Nguyen Tran	Chief Strategy Officer…	MEXER	57,000	—	—	+141.8%	Open the original filing on SEC.gov
Jul 28	Kinney Gene G.	President and CEO	MEXER◆	84,000	—	—	—	Open the original filing on SEC.gov
Jul 28	Kinney Gene G.	President and CEO	DTOISS	84,000	$8.56	$719K	-55.0%	Open the original filing on SEC.gov
Jul 28	Kinney Gene G.	President and CEO	MEXER	84,000	—	—	+122.1%	Open the original filing on SEC.gov
Jul 28	Kingston Anne Evans	Chief Strategy Officer	FTAX◷	3,498	$8.56	$29.9K	-5.2%	Open the original filing on SEC.gov
Jul 28	Isaacs Michael John	General Counsel &…	FTAX◷	4,694	$8.56	$40.2K	-9.6%	Open the original filing on SEC.gov
Jun 16	Scully William P	10% Owner	PBUY	20,000	$7.90	$158K	+2.7%	Open the original filing on SEC.gov
Jun 15	Scully William P	10% Owner	GGIFT	325,000	—	—	-30.6%	Open the original filing on SEC.gov
Jun 11	Scully William P	10% Owner	PBUY	125,000	$8.17	$1M	+13.4%	Open the original filing on SEC.gov
Jun 4	Scully William P	10% Owner	PBUY	50,000	$9.31	$465.3K	+5.6%	Open the original filing on SEC.gov
Jun 2	Scully William P	10% Owner	PBUY	50,000	$9.43	$471.3K	+6.0%	Open the original filing on SEC.gov
May 22	Scully William P	10% Owner	PBUY↓	100,000	$9.81	$981.3K	+13.6%	Open the original filing on SEC.gov
May 15	Welch Daniel G	Director	AGRANT◆	27,000	—	—	—	Open the original filing on SEC.gov
May 15	Selkoe Dennis J.	Director	AGRANT◆	27,000	—	—	—	Open the original filing on SEC.gov
May 15	Ekman Lars	Director	AGRANT◆	27,000	—	—	—	Open the original filing on SEC.gov
May 15	Dunn William H. Jr.	Director	AGRANT◆	27,000	—	—	—	Open the original filing on SEC.gov
May 15	Cooke Shane	Director	AGRANT◆	27,000	—	—	—	Open the original filing on SEC.gov
May 15	Collier Richard T	Director	AGRANT◆	27,000	—	—	—	Open the original filing on SEC.gov
Apr 10	Kingston Anne Evans	Chief Strategy Officer	AGRANT◆	100,000	—	—	—	Open the original filing on SEC.gov
Mar 3	Zago Wagner M.	Chief Scientific Officer	AGRANT◆	190,000	—	—	—	Open the original filing on SEC.gov
Mar 3	Walker Karin L	Chief Accounting Officer	AGRANT◆	150,000	—	—	—	Open the original filing on SEC.gov
Mar 3	Swanson Chad J.	Chief Development…	AGRANT◆	190,000	—	—	—	Open the original filing on SEC.gov
Mar 3	Smith Brandon S.	Chief Operating Officer	AGRANT◆	190,000	—	—	—	Open the original filing on SEC.gov
Mar 3	Nguyen Tran	Chief Strategy Officer…	AGRANT◆	230,000	—	—	—	Open the original filing on SEC.gov
Mar 3	Malecek Michael J	Chief Legal Officer	AGRANT◆	190,000	—	—	—	Open the original filing on SEC.gov
Mar 3	Kinney Gene G.	President and CEO	AGRANT◆	520,000	—	—	—	Open the original filing on SEC.gov
Jul 28, 2025	Zago Wagner M.	Chief Scientific Officer	AGRANT	85,000	—	—	—	Open the original filing on SEC.gov
Jul 28, 2025	Walker Karin L	Chief Accounting Officer	AGRANT	25,000	—	—	—	Open the original filing on SEC.gov
Jul 28, 2025	Swanson Chad J.	Chief Development…	AGRANT	85,000	—	—	—	Open the original filing on SEC.gov
Jul 28, 2025	Smith Brandon S.	Chief Operating Officer	AGRANT	130,000	—	—	—	Open the original filing on SEC.gov
Jul 28, 2025	Nguyen Tran	Chief Strategy Officer…	AGRANT	95,000	—	—	+4,308%	Open the original filing on SEC.gov
Jul 28, 2025	Malecek Michael J	Chief Legal Officer	AGRANT	80,000	—	—	—	Open the original filing on SEC.gov
Jul 28, 2025	Kinney Gene G.	President and CEO	AGRANT	140,000	—	—	+1,094%	Open the original filing on SEC.gov
May 14, 2025	Welch Daniel G	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 14, 2025	Selkoe Dennis J.	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 14, 2025	Kim Helen Susan	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 14, 2025	Ekman Lars	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 14, 2025	Dunn William H. Jr.	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 14, 2025	Cooke Shane	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 14, 2025	Cobb Paula K	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 14, 2025	Collier Richard T	Director	AGRANT◆	20,183	—	—	—	Open the original filing on SEC.gov
May 6, 2025	EcoR1 Capital, LLC	10% Owner	SSELL	2M	$7.64	$15.2M	-27.2%	Open the original filing on SEC.gov
May 5, 2025	EcoR1 Capital, LLC	10% Owner	SSELL	977,693	$8.11	$7.9M	-11.8%	Open the original filing on SEC.gov
May 2, 2025	EcoR1 Capital, LLC	10% Owner	SSELL	3.3M	$8.36	$27.7M	-28.6%	Open the original filing on SEC.gov
Jan 15, 2025	Scully William P	10% Owner	GGIFT	12,000	—	—	-20.3%	Open the original filing on SEC.gov
Jan 14, 2025	Scully William P	10% Owner	PBUY	100,000	$12.79	$1.3M	+15.7%	Open the original filing on SEC.gov
Jan 3, 2025	Scully William P	10% Owner	GGIFT	1,000	—	—	-0.2%	Open the original filing on SEC.gov
Jan 2, 2025	Scully William P	10% Owner	GGIFT	13,200	—	—	-2.0%	Open the original filing on SEC.gov
Dec 31, 2024	Scully William P	10% Owner	PBUY	30,000	$12.99	$389.6K	+4.8%	Open the original filing on SEC.gov
Dec 31, 2024	Scully William P	10% Owner	PBUY	800	$13.39	$10.7K	+0.1%	Open the original filing on SEC.gov
Dec 31, 2024	Scully William P	10% Owner	PBUY↓	1,200	$13.37	$16K	+0.2%	Open the original filing on SEC.gov
Dec 20, 2024	Scully William P	10% Owner	GGIFT	40,000	—	—	-40.4%	Open the original filing on SEC.gov
Dec 20, 2024	Scully William P	10% Owner	GGIFT	500	—	—	<0.1%	Open the original filing on SEC.gov
Dec 20, 2024	Scully William P	10% Owner	PBUY	2,000	$15.91	$31.8K	+0.3%	Open the original filing on SEC.gov
Dec 19, 2024	Scully William P	10% Owner	GGIFT	681,000	—	—	-52.5%	Open the original filing on SEC.gov
Dec 18, 2024	Scully William P	10% Owner	PBUY	73,436	$13.93	$1M	+6.0%	Open the original filing on SEC.gov
Dec 18, 2024	Scully William P	10% Owner	GGIFT	430,000	—	—	+54.1%	Open the original filing on SEC.gov

PBUY$843.5K

Scully William P · 10% OwnerSep 18

100,000 sh @ $8.43 · +12.1% own

PBUY$255.7K

Scully William P · 10% OwnerSep 2

27,000 sh @ $9.47 · +3.4% own

PBUY$439.4K

Scully William P · 10% OwnerAug 20

50,000 sh @ $8.79 · +6.7% own

GGIFT—

Scully William P · 10% OwnerAug 10

251,553 sh · +31.8% own

PBUY$30.2K

Scully William P · 10% OwnerAug 7

3,500 sh @ $8.62 · +4.4% own

PBUY$293.1K

Scully William P · 10% OwnerAug 7

34,000 sh @ $8.62 · +4.5% own

SSELL◷$64.9K

Kingston Anne Evans · Chief Strategy…Jul 29

7,662 sh @ $8.47 · -12.1% own

SSELL◷$71.1K

Isaacs Michael John · General Counsel &…Jul 29

8,386 sh @ $8.47 · -19.0% own

MEXER◆—

Zago Wagner M. · Chief Scientific…Jul 28

51,000 sh

DTOISS$436.6K

Zago Wagner M. · Chief Scientific…Jul 28

51,000 sh @ $8.56 · -60.0% own

MEXER—

Zago Wagner M. · Chief Scientific…Jul 28

51,000 sh · +150.0% own

MEXER◆—

Walker Karin L · Chief Accounting…Jul 28

15,000 sh

DTOISS$128.4K

Walker Karin L · Chief Accounting…Jul 28

15,000 sh @ $8.56 · -60.0% own

MEXER—

Walker Karin L · Chief Accounting…Jul 28

15,000 sh · +150.0% own

MEXER◆—

Swanson Chad J. · Chief Development…Jul 28

51,000 sh

FTAX$29.7K

Swanson Chad J. · Chief Development…Jul 28

3,467 sh @ $8.56 · -7.8% own

DTOISS$349.2K

Swanson Chad J. · Chief Development…Jul 28

40,800 sh @ $8.56 · -48.0% own

MEXER—

Swanson Chad J. · Chief Development…Jul 28

51,000 sh · +150.0% own

MEXER◆—

Smith Brandon S. · Chief Operating…Jul 28

78,000 sh

DTOISS$667.7K

Smith Brandon S. · Chief Operating…Jul 28

78,000 sh @ $8.56 · -60.0% own

MEXER—

Smith Brandon S. · Chief Operating…Jul 28

78,000 sh · +150.0% own

MEXER◆—

Nguyen Tran · Chief Strategy…Jul 28

57,000 sh

DTOISS$487.9K

Nguyen Tran · Chief Strategy…Jul 28

57,000 sh @ $8.56 · -58.6% own

MEXER—

Nguyen Tran · Chief Strategy…Jul 28

57,000 sh · +141.8% own

MEXER◆—

Kinney Gene G. · President and CEOJul 28

84,000 sh

DTOISS$719K

Kinney Gene G. · President and CEOJul 28

84,000 sh @ $8.56 · -55.0% own

MEXER—

Kinney Gene G. · President and CEOJul 28

84,000 sh · +122.1% own

FTAX◷$29.9K

Kingston Anne Evans · Chief Strategy…Jul 28

3,498 sh @ $8.56 · -5.2% own

FTAX◷$40.2K

Isaacs Michael John · General Counsel &…Jul 28

4,694 sh @ $8.56 · -9.6% own

PBUY$158K

Scully William P · 10% OwnerJun 16

20,000 sh @ $7.90 · +2.7% own

GGIFT—

Scully William P · 10% OwnerJun 15

325,000 sh · -30.6% own

PBUY$1M

Scully William P · 10% OwnerJun 11

125,000 sh @ $8.17 · +13.4% own

PBUY$465.3K

Scully William P · 10% OwnerJun 4

50,000 sh @ $9.31 · +5.6% own

PBUY$471.3K

Scully William P · 10% OwnerJun 2

50,000 sh @ $9.43 · +6.0% own

PBUY↓$981.3K

Scully William P · 10% OwnerMay 22

100,000 sh @ $9.81 · +13.6% own

AGRANT◆—

Welch Daniel G · DirectorMay 15

27,000 sh

AGRANT◆—

Selkoe Dennis J. · DirectorMay 15

27,000 sh

AGRANT◆—

Ekman Lars · DirectorMay 15

27,000 sh

AGRANT◆—

Dunn William H. Jr. · DirectorMay 15

27,000 sh

AGRANT◆—

Cooke Shane · DirectorMay 15

27,000 sh

AGRANT◆—

Collier Richard T · DirectorMay 15

27,000 sh

AGRANT◆—

Kingston Anne Evans · Chief Strategy…Apr 10

100,000 sh

AGRANT◆—

Zago Wagner M. · Chief Scientific…Mar 3

190,000 sh

AGRANT◆—

Walker Karin L · Chief Accounting…Mar 3

150,000 sh

AGRANT◆—

Swanson Chad J. · Chief Development…Mar 3

190,000 sh

AGRANT◆—

Smith Brandon S. · Chief Operating…Mar 3

190,000 sh

AGRANT◆—

Nguyen Tran · Chief Strategy…Mar 3

230,000 sh

AGRANT◆—

Malecek Michael J · Chief Legal…Mar 3

190,000 sh

AGRANT◆—

Kinney Gene G. · President and CEOMar 3

520,000 sh

AGRANT—

Zago Wagner M. · Chief Scientific…Jul 28, 2025

85,000 sh

AGRANT—

Walker Karin L · Chief Accounting…Jul 28, 2025

25,000 sh

AGRANT—

Swanson Chad J. · Chief Development…Jul 28, 2025

85,000 sh

AGRANT—

Smith Brandon S. · Chief Operating…Jul 28, 2025

130,000 sh

AGRANT—

Nguyen Tran · Chief Strategy…Jul 28, 2025

95,000 sh · +4,308% own

AGRANT—

Malecek Michael J · Chief Legal…Jul 28, 2025

80,000 sh

AGRANT—

Kinney Gene G. · President and CEOJul 28, 2025

140,000 sh · +1,094% own

AGRANT◆—

Welch Daniel G · DirectorMay 14, 2025

20,183 sh

AGRANT◆—

Selkoe Dennis J. · DirectorMay 14, 2025

20,183 sh

AGRANT◆—

Kim Helen Susan · DirectorMay 14, 2025

20,183 sh

AGRANT◆—

Ekman Lars · DirectorMay 14, 2025

20,183 sh

AGRANT◆—

Dunn William H. Jr. · DirectorMay 14, 2025

20,183 sh

AGRANT◆—

Cooke Shane · DirectorMay 14, 2025

20,183 sh

AGRANT◆—

Cobb Paula K · DirectorMay 14, 2025

20,183 sh

AGRANT◆—

Collier Richard T · DirectorMay 14, 2025

20,183 sh

SSELL$15.2M

EcoR1 Capital, LLC · 10% OwnerMay 6, 2025

2M sh @ $7.64 · -27.2% own

SSELL$7.9M

EcoR1 Capital, LLC · 10% OwnerMay 5, 2025

977,693 sh @ $8.11 · -11.8% own

SSELL$27.7M

EcoR1 Capital, LLC · 10% OwnerMay 2, 2025

3.3M sh @ $8.36 · -28.6% own

GGIFT—

Scully William P · 10% OwnerJan 15, 2025

12,000 sh · -20.3% own

PBUY$1.3M

Scully William P · 10% OwnerJan 14, 2025

100,000 sh @ $12.79 · +15.7% own

GGIFT—

Scully William P · 10% OwnerJan 3, 2025

1,000 sh · -0.2% own

GGIFT—

Scully William P · 10% OwnerJan 2, 2025

13,200 sh · -2.0% own

PBUY$389.6K

Scully William P · 10% OwnerDec 31, 2024

30,000 sh @ $12.99 · +4.8% own

PBUY$10.7K

Scully William P · 10% OwnerDec 31, 2024

800 sh @ $13.39 · +0.1% own

PBUY↓$16K

Scully William P · 10% OwnerDec 31, 2024

1,200 sh @ $13.37 · +0.2% own

GGIFT—

Scully William P · 10% OwnerDec 20, 2024

40,000 sh · -40.4% own

GGIFT—

Scully William P · 10% OwnerDec 20, 2024

500 sh · <0.1% own

PBUY$31.8K

Scully William P · 10% OwnerDec 20, 2024

2,000 sh @ $15.91 · +0.3% own

GGIFT—

Scully William P · 10% OwnerDec 19, 2024

681,000 sh · -52.5% own

PBUY$1M

Scully William P · 10% OwnerDec 18, 2024

73,436 sh @ $13.93 · +6.0% own

GGIFT—

Scully William P · 10% OwnerDec 18, 2024

430,000 sh · +54.1% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

1 of 43 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 89 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
Dec 18, 2024	May 1, 2025	Scully William P10% Owner	89days · about 4 months	$1.3M	Filing ↗

Scully William P10% Owner

89days · about 4 months

Traded Dec 18, 2024 · filed May 1, 2025Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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