Susquehanna Fundamental Investments’s Prothena Corp PRTA Stock Holding History

Susquehanna Fundamental Investments’s Portfolio PRTA Stock Details PRTA Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q3	–	Sell	-37,591	Closed	-$228K	–	720
2025 Q2	$228K	Sell	37,591 -37,181	-50%	-$279K	0.01%	653
2025 Q1	$925K	Sell	74,772 -5,905	-7%	-$83.5K	0.01%	709
2024 Q4	$1.12M	Buy	+80,677	New	+$1.27M	0.02%	677
2024 Q2	–	Sell	-13,818	Closed	-$342K	–	996
2024 Q1	$342K	Buy	+13,818	New	+$411K	0.02%	530
2023 Q1	–	Sell	-3,425	Closed	-$206K	–	1071
2022 Q4	$206K	Hold	3,425	–	–	﹤0.01%	1065
2022 Q3	$208K	Buy	+3,425	New	+$108K	﹤0.01%	1251
2022 Q1	–	Sell	-19,290	Closed	-$953K	–	1662
2021 Q4	$953K	Sell	19,290 -10,860	-36%	-$602K	0.03%	672
2021 Q3	$2.15M	Hold	30,150	–	–	0.04%	572
2021 Q2	$1.55M	Buy	30,150 +1,470	+5%	+$45.9K	0.03%	688
2021 Q1	$720K	Buy	28,680 +15,920	+125%	+$300K	0.01%	1009
2020 Q4	$153K	Buy	+12,760	New	+$151K	﹤0.01%	1392

Other funds holding PRTA

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return

RCMNY

Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return

ACM

ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Susquehanna Fundamental Investments's PRTA Position: Q3 2025 in Review

Susquehanna Fundamental Investments sold out of Prothena Corp (PRTA) in Q3 2025, closing a stake of 37,591 shares — an estimated $228K sold.

Susquehanna Fundamental Investments first reported a position in PRTA in Q4 2020 and held it in 11 quarters. The position peaked at $2.15M in Q3 2021. 187 funds tracked by Wall St. Rank hold PRTA as of Q3 2025.

Susquehanna Fundamental Investments reported no remaining Prothena Corp position as of Q3 2025 after selling out during the quarter.
Susquehanna Fundamental Investments sold 37,591 Prothena Corp shares in Q3 2025, an estimated $228K.
Susquehanna Fundamental Investments first reported a position in Prothena Corp in Q4 2020 and held it in 11 quarters.
Susquehanna Fundamental Investments's Prothena Corp position peaked at $2.15M in Q3 2021.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2025.

Based on Susquehanna Fundamental Investments's 13F filing for Q3 2025, filed 14 Nov 2025.