Question 1

How many shares of PRTA does SIMPLEX TRADING, LLC own?

Accepted Answer

SIMPLEX TRADING, LLC previously held 0 shares of PRTA (PROTHENA CORP PLC) before exiting the position in 2026-Q2.

Question 2

What is SIMPLEX TRADING, LLC's PRTA position worth?

Accepted Answer

SIMPLEX TRADING, LLC's PRTA position was last reported at $0 in 2026-Q2 before the exit.

Question 3

Is SIMPLEX TRADING, LLC buying or selling PRTA?

Accepted Answer

In 2026-Q2, SIMPLEX TRADING, LLC exited their PRTA position entirely (-100.0% change in shares).

Question 4

When did SIMPLEX TRADING, LLC first buy PRTA?

Accepted Answer

Based on available 13F filings, SIMPLEX TRADING, LLC first reported a position in PRTA in 2024-Q3. They have held the position across 24 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Exited	0	-100.0%	$0	0.0%	$9.79	0
2026-Q1	Decreased	1,303	-32.4%	$12,665	0.0%	$9.36	0
2025-Q4	Decreased	1,927	-95.4%	$18,402	0.0%	$9.31	0
2025-Q3	Decreased	42,044	-2.8%	$410,000	0.0%	$9.76	0
2025-Q2	New	43,264	—	$262,000	0.0%	$6.08	32
2024-Q4	Exited	0	-100.0%	$0	0.0%	$14.88	0
2024-Q3	Increased	5,977	+163.7%	$99,000	0.0%	$20.05	35