Oppenheimer & Co’s Prothena Corp PRTA Stock Holding History

Oppenheimer & Co’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 Q4	–	Sell	-11,660	Closed	-$114K	–	1707
2025 Q3	$114K	Sell	11,660 -6,935	-37%	-$53.3K	﹤0.01%	1604
2025 Q2	$113K	Buy	+18,595	New	+$140K	﹤0.01%	1555
2024 Q1	–	Sell	-6,326	Closed	-$230K	–	1497
2023 Q4	$230K	Sell	6,326 -1,582	-20%	-$60.9K	﹤0.01%	1239
2023 Q3	$382K	Buy	7,908 +295	+4%	+$17.5K	0.01%	1045
2023 Q2	$520K	Buy	7,613 +343	+5%	+$22.1K	0.01%	954
2023 Q1	$352K	Buy	+7,270	New	+$384K	0.01%	1085
2022 Q1	–	Sell	-4,549	Closed	-$225K	–	1560
2021 Q4	$225K	Sell	4,549 -214	-4%	-$11.9K	﹤0.01%	1351
2021 Q3	$339K	Buy	+4,763	New	+$296K	0.01%	1174
2018 Q4	–	Sell	-10,705	Closed	-$140K	–	1335
2018 Q3	$140K	Sell	10,705 -750	-7%	-$10.8K	﹤0.01%	1284
2018 Q2	$166K	Buy	11,455 +3,700	+48%	+$73.1K	﹤0.01%	1245
2018 Q1	$284K	Buy	+7,755	New	+$282K	0.01%	1088
2014 Q4	–	Sell	-11,030	Closed	-$245K	–	1462
2014 Q3	$245K	Buy	+11,030	New	+$234K	0.01%	1158

Other funds holding PRTA

Fidelity Investments

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

BlackRock New York $5.7T AUM 30.48% 1-Year Est. Return

Rubric Capital Management (New York) New York $8.16B AUM 68.42% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

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

D.E. Shaw & Co New York $127B AUM 43.98% 1-Year Est. Return

Armistice Capital New York $3.03B AUM 36.06% 1-Year Est. Return

ADAR1 Capital Management Austin, Texas $1.66B AUM 340.85% 1-Year Est. Return

Acadian Asset Management

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

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