Steven Cohen’s Prothena Corp PRTA Stock Holding History

Steven Cohen’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 Q1	–	Sell	-29,700	Closed	-$284K	–	4337
2025 Q4	$284K	Buy	+29,700	New	+$302K	﹤0.01%	3500

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

Steven Cohen's PRTA Position: Q2 2026 in Review

Steven Cohen sold out of Prothena Corp (PRTA) in Q2 2026, closing a stake of 399,830 shares — an estimated $3.89M sold.

Steven Cohen first reported a position in PRTA in Q2 2015 and held it in 18 quarters. The position peaked at $18.8M in Q4 2022. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Steven Cohen reported no remaining Prothena Corp position as of Q2 2026 after selling out during the quarter.
Steven Cohen sold 399,830 Prothena Corp shares in Q2 2026, an estimated $3.89M.
Steven Cohen first reported a position in Prothena Corp in Q2 2015 and held it in 18 quarters.
Steven Cohen's Prothena Corp position peaked at $18.8M in Q4 2022.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Point72 Asset Management's 13F filing for Q2 2026, filed 14 Aug 2026.