Steve Schonfeld’s Prothena Corp PRTA Stock Holding History

Steve Schonfeld’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	$493K	Buy	50,350 +37,951	+306%	+$375K	﹤0.01%	1823
2026 Q1	$121K	Buy	+12,399	New	+$114K	﹤0.01%	1853
2025 Q3	–	Sell	-307,341	Closed	-$1.87M	–	2497
2025 Q2	$1.87M	Buy	+307,341	New	+$2.31M	0.01%	1025
2024 Q4	–	Sell	-62,272	Closed	-$1.04M	–	2308
2024 Q3	$1.04M	Buy	+62,272	New	+$1.34M	0.01%	1146
2023 Q1	–	Sell	-28,128	Closed	-$1.69M	–	2530
2022 Q4	$1.69M	Sell	28,128 -16,662	-37%	-$976K	0.01%	893
2022 Q3	$2.72M	Buy	+44,790	New	+$1.42M	0.02%	744
2022 Q1	–	Sell	-10,387	Closed	-$513K	–	2855
2021 Q4	$513K	Buy	10,387 +6,622	+176%	+$367K	﹤0.01%	1242
2021 Q3	$269K	Buy	+3,765	New	+$234K	﹤0.01%	1588

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

Steve Schonfeld's PRTA Position: Q2 2026 in Review

Steve Schonfeld increased its Prothena Corp (PRTA) stake by 306% in Q2 2026, buying an estimated $375K and bringing the position to 50,350 shares worth $493K. The position accounts for ﹤0.01% of the portfolio, ranked #1823.

Steve Schonfeld first reported a position in PRTA in Q3 2021 and has held it in 8 quarters since. The position peaked at $2.72M in Q3 2022. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Steve Schonfeld held 50,350 shares of Prothena Corp worth $493K as of Q2 2026.
Steve Schonfeld bought 37,951 Prothena Corp shares in Q2 2026, an estimated $375K.
Prothena Corp made up ﹤0.01% of Steve Schonfeld's portfolio in Q2 2026, its #1823 holding.
Steve Schonfeld first reported a position in Prothena Corp in Q3 2021 and has held it in 8 quarters since.
Steve Schonfeld's Prothena Corp position peaked at $2.72M in Q3 2022.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Schonfeld Strategic Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.