William P. Scully

CIK: 0001045463

Transaction Breakdown

Open Market Buys (P)25 (67.6%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)0 (0.0%)

Compensation grants

Other (G, F, J, C, D, …)12 (32.4%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

PRTA

PROTHENA CORP PUBLIC LTD CO

10% Owner

Discretionary Trading P&L

Holdings

Transaction History (37 total)

PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 27, 2026
Gift(G)
Direct
566.4K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 23, 2026
Purchase(P)
Direct
50K shares at avg. $8.07$404K
PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 22, 2026
Purchase(P)
Direct
100K shares at avg. $8.19$819K
PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 14, 2026
Purchase(P)
Direct
10K shares at avg. $8.46$85K
PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 13, 2026
Purchase(P)
Direct
100K shares at avg. $8.35$835K
PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 8, 2026
Purchase(P)
Indirect
90K shares at avg. $8.57$771K
PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 7, 2026
Purchase(P)
Indirect
125K shares at avg. $8.40$1.1M
PRTA
PROTHENA CORP PUBLIC LTD CO
Oct 2, 2026
Purchase(P)
Indirect
100K shares at avg. $8.57$857K
PRTA
PROTHENA CORP PUBLIC LTD CO
Sep 29, 2026
Purchase(P)
Indirect
162K shares at avg. $8.68$1.4M
PRTA
PROTHENA CORP PUBLIC LTD CO
Sep 28, 2026
Purchase(P)
Indirect
103.5K shares at avg. $8.60$890K
PRTA
PROTHENA CORP PUBLIC LTD CO
Sep 18, 2026
Purchase(P)
Direct
100K shares at avg. $8.43$843K
PRTA
PROTHENA CORP PUBLIC LTD CO
Sep 2, 2026
Purchase(P)
Direct
27K shares at avg. $9.47$256K
PRTA
PROTHENA CORP PUBLIC LTD CO
Aug 20, 2026
Purchase(P)
Direct
50K shares at avg. $8.79$439K
PRTA
PROTHENA CORP PUBLIC LTD CO
Aug 18, 2026
Gift(G)
Direct
627.6K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Aug 17, 2026
Gift(G)
Direct
336K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Aug 10, 2026
Gift(G)
Direct
251.6K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Aug 7, 2026
Purchase(P)
Indirect
3.5K shares at avg. $8.62$30K
PRTA
PROTHENA CORP PUBLIC LTD CO
Aug 7, 2026
Purchase(P)
Direct
34K shares at avg. $8.62$293K
PRTA
PROTHENA CORP PUBLIC LTD CO
Jun 16, 2026
Purchase(P)
Direct
20K shares at avg. $7.90$158K
PRTA
PROTHENA CORP PUBLIC LTD CO
Jun 15, 2026
Gift(G)
Direct
325K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Jun 11, 2026
Purchase(P)
Direct
125K shares at avg. $8.17$1.0M
PRTA
PROTHENA CORP PUBLIC LTD CO
Jun 4, 2026
Purchase(P)
Direct
50K shares at avg. $9.31$465K
PRTA
PROTHENA CORP PUBLIC LTD CO
Jun 2, 2026
Purchase(P)
Direct
50K shares at avg. $9.43$471K
PRTA
PROTHENA CORP PUBLIC LTD CO
May 22, 2026
Purchase(P)
Direct
100K shares at avg. $9.81$981K
PRTA
PROTHENA CORP PUBLIC LTD CO
Jan 15, 2025
Gift(G)
Indirect
12K shares-

		Type	Shares	Price		Ownership
Oct 27, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Gift(G)	566,444	-	$0	Direct
Oct 23, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	50,000	$8.07	$403,525	Direct
Oct 22, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	100,000	$8.19	$818,520	Direct
Oct 14, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	10,000	$8.46	$84,569	Direct
Oct 13, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	100,000	$8.35	$835,480	Direct
Oct 8, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	90,000	$8.57	$770,904	Indirect
Oct 7, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	125,000	$8.40	$1,050,150	Indirect
Oct 2, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	100,000	$8.57	$857,240	Indirect
Sep 29, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	162,000	$8.68	$1,405,674	Indirect
Sep 28, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	103,500	$8.60	$889,872	Indirect
Sep 18, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	100,000	$8.43	$843,460	Direct
Sep 2, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	27,000	$9.47	$255,739	Direct
Aug 20, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	50,000	$8.79	$439,430	Direct
Aug 18, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Gift(G)	627,553	-	$0	Direct
Aug 17, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Gift(G)	336,000	-	$0	Direct
Aug 10, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Gift(G)	251,553	-	$0	Direct
Aug 7, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	3,500	$8.62	$30,167	Indirect
Aug 7, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	34,000	$8.62	$293,053	Direct
Jun 16, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	20,000	$7.90	$157,990	Direct
Jun 15, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Gift(G)	325,000	-	$0	Direct
Jun 11, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	125,000	$8.17	$1,021,225	Direct
Jun 4, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	50,000	$9.31	$465,295	Direct
Jun 2, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	50,000	$9.43	$471,300	Direct
May 22, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Purchase(P)	100,000	$9.81	$981,300	Direct
Jan 15, 2025	PRTA PROTHENA CORP PUBLIC LTD CO	Gift(G)	12,000	-	-	Indirect

1-25 of 37 transactions

About SCULLY WILLIAM P

SCULLY WILLIAM P (SEC CIK 0001045463) files insider reports with the SEC as 10% Owner of PROTHENA CORP PUBLIC LTD CO (PRTA).

Signal8 holds 22 ownership filings by SCULLY WILLIAM P (2 Form 3, 20 Form 4), filed between May 1, 2025 and Oct 29, 2026. Those filings report 37 transactions, from Dec 18, 2024 to Oct 27, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on SCULLY WILLIAM P's filings is in VERO BEACH, FL.

Recent filings by SCULLY WILLIAM P

Oct 27, 2026: Gift of PRTA shares (Form 4, code G).
Oct 23, 2026: Open-market purchase of PRTA shares (Form 4, code P).
Oct 22, 2026: Open-market purchase of PRTA shares (Form 4, code P).
Oct 14, 2026: Open-market purchase of PRTA shares (Form 4, code P).
Oct 13, 2026: Open-market purchase of PRTA shares (Form 4, code P).

Other insiders filing for PROTHENA CORP PUBLIC LTD CO (PRTA)

Fennell Todd W., 10% Owner
Zago Wagner M., Chief Scientific Officer
Walker Karin L, Chief Accounting Officer
Swanson Chad J., Chief Development Officer
Smith Brandon S., Chief Operating Officer
Nguyen Tran, Chief Strategy Officer and CFO

How to read Form 4 transaction codes