Quadrant Capital Group’s Prothena Corp PRTA Stock Holding History

Quadrant Capital Group’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
2026 Q2	–	Sell	-841	Closed	-$8.18K	–	2235
2026 Q1	$8.18K	Sell	841 -419	-33%	-$3.84K	﹤0.01%	2243
2025 Q4	$12K	Hold	1,260	–	–	﹤0.01%	2156
2025 Q3	$12.3K	Buy	+1,260	New	+$9.69K	﹤0.01%	2105
2025 Q1	–	Sell	-158	Closed	-$2.19K	–	2825
2024 Q4	$2.19K	Sell	158 -1,225	-89%	-$19.3K	﹤0.01%	2484
2024 Q3	$23.1K	Buy	1,383 +997	+258%	+$21.4K	﹤0.01%	1832
2024 Q2	$7.97K	Sell	386 -574	-60%	-$12.4K	﹤0.01%	2185
2024 Q1	$23.8K	Buy	960 +941	+4,953%	+$28K	﹤0.01%	1776
2023 Q4	$691	Hold	19	–	–	﹤0.01%	2588
2023 Q3	$917	Hold	19	–	–	﹤0.01%	2496
2023 Q2	$1.3K	Hold	19	–	–	﹤0.01%	2476
2023 Q1	$921	Hold	19	–	–	﹤0.01%	2548
2022 Q4	$1.15K	Hold	19	–	–	﹤0.01%	2519
2022 Q3	$1K	Buy	+19	New	+$601	﹤0.01%	2549
2020 Q4	–	Sell	-105	Closed	-$1K	–	2358
2020 Q3	$1K	Hold	105	–	–	﹤0.01%	2036
2020 Q2	$1K	Hold	105	–	–	﹤0.01%	2112
2020 Q1	$1K	Hold	105	–	–	﹤0.01%	2028
2019 Q4	$1K	Buy	+105	New	+$1.13K	﹤0.01%	2348
2019 Q2	–	Sell	-105	Closed	-$1K	–	2384
2019 Q1	$1K	Buy	+105	New	+$1.31K	﹤0.01%	2184
2016 Q1	–	Sell	-84	Closed	-$5K	–	1937
2015 Q4	$5K	Buy	+84	New	+$5.07K	﹤0.01%	1114

Other funds holding PRTA

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

RCMNY

Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return

ACM

ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Quadrant Capital Group's PRTA Position: Q2 2026 in Review

Quadrant Capital Group sold out of Prothena Corp (PRTA) in Q2 2026, closing a stake of 841 shares — an estimated $8.18K sold.

Quadrant Capital Group first reported a position in PRTA in Q4 2015 and held it in 19 quarters. The position peaked at $23.8K in Q1 2024. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Quadrant Capital Group reported no remaining Prothena Corp position as of Q2 2026 after selling out during the quarter.
Quadrant Capital Group sold 841 Prothena Corp shares in Q2 2026, an estimated $8.18K.
Quadrant Capital Group first reported a position in Prothena Corp in Q4 2015 and held it in 19 quarters.
Quadrant Capital Group's Prothena Corp position peaked at $23.8K in Q1 2024.
188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Quadrant Capital Group's 13F filing for Q2 2026, filed 14 Aug 2026.