Karin L. Walker

CIK: 0001559422

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)1 (20.0%)

Derivative conversions

Awards (A)3 (60.0%)

Compensation grants

Other (G, F, J, C, D, …)1 (20.0%)

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

Companies & Roles (1)

PRTA

PROTHENA CORP PUBLIC LTD CO

Officer

Discretionary Trading P&L

Holdings

Transaction History (5 total)

PRTA
PROTHENA CORP PUBLIC LTD CO
Jul 28, 2026
Exercise(M)
Direct
15K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Jul 28, 2026
Disposition(D)
Direct
15K shares at avg. $8.56$128K
PRTA
PROTHENA CORP PUBLIC LTD CO
Mar 3, 2026
Award(A)
Stock Option (Right to Buy)
Direct
150K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Jul 28, 2025
Award(A)
Direct
25K shares-
PRTA
PROTHENA CORP PUBLIC LTD CO
Mar 5, 2025
Award(A)
Stock Option (Right to Buy)
Direct
70K shares-

		Type	Shares	Price		Ownership
Jul 28, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Exercise(M)	15,000	-	$0	Direct
Jul 28, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Disposition(D)	15,000	$8.56	$128,400	Direct
Mar 3, 2026	PRTA PROTHENA CORP PUBLIC LTD CO	Award(A) Stock Option (Right to Buy)	150,000	-	-	Direct
Jul 28, 2025	PRTA PROTHENA CORP PUBLIC LTD CO	Award(A)	25,000	-	-	Direct
Mar 5, 2025	PRTA PROTHENA CORP PUBLIC LTD CO	Award(A) Stock Option (Right to Buy)	70,000	-	-	Direct

1-5 of 5 transactions

About Walker Karin L

Walker Karin L (SEC CIK 0001559422) files insider reports with the SEC as Chief Accounting Officer of PROTHENA CORP PUBLIC LTD CO (PRTA).

Signal8 holds 4 ownership filings by Walker Karin L, all Form 4s, filed between Mar 7, 2025 and Jul 30, 2026. Those filings report 5 transactions, from Mar 5, 2025 to Jul 28, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Walker Karin L's filings is in BRISBANE, CA.

Recent filings by Walker Karin L

Jul 28, 2026: Option exercise of PRTA shares (Form 4, code M).
Jul 28, 2026: Disposition to issuer transaction of PRTA shares (Form 4, code D).
Mar 3, 2026: Grant or award of PRTA derivative securities (Form 4, code A).
Jul 28, 2025: Grant or award of PRTA shares (Form 4, code A).
Mar 5, 2025: Grant or award of PRTA derivative securities (Form 4, code A).

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

SCULLY WILLIAM P, 10% Owner
Fennell Todd W., 10% Owner
Zago Wagner M., Chief Scientific 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