Armistice Capital’s Prothena Corp PRTA Stock Holding History

Armistice Capital’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	-439,411	Closed	-$4.27M	–	399
2026 Q1	$4.27M	Sell	439,411 -1,060,589	-71%	-$9.72M	0.08%	130
2025 Q4	$14.3M	Sell	1,500,000 -324,000	-18%	-$3.3M	0.17%	90
2025 Q3	$17.8M	Sell	1,824,000 -412,000	-18%	-$3.17M	0.26%	61
2025 Q2	$13.6M	Buy	2,236,000 +40,000	+2%	+$300K	0.23%	56
2025 Q1	$27.2M	Sell	2,196,000 -40,000	-2%	-$566K	0.41%	52
2024 Q4	$31M	Buy	2,236,000 +586,000	+36%	+$9.24M	0.42%	42
2024 Q3	$27.6M	Buy	1,650,000 +90,000	+6%	+$1.94M	0.44%	42
2024 Q2	$32.2M	Buy	1,560,000 +464,000	+42%	+$10M	0.41%	43
2024 Q1	$27.1M	Buy	1,096,000 +818,000	+294%	+$24.3M	0.36%	45
2023 Q4	$10.1M	Buy	+278,000	New	+$10.7M	0.14%	85

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

Armistice Capital's PRTA Position: Q2 2026 in Review

Armistice Capital sold out of Prothena Corp (PRTA) in Q2 2026, closing a stake of 439,411 shares — an estimated $4.27M sold.

Armistice Capital first reported a position in PRTA in Q4 2023 and held it in 10 quarters. The position peaked at $32.2M in Q2 2024. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Armistice Capital reported no remaining Prothena Corp position as of Q2 2026 after selling out during the quarter.
Armistice Capital sold 439,411 Prothena Corp shares in Q2 2026, an estimated $4.27M.
Armistice Capital first reported a position in Prothena Corp in Q4 2023 and held it in 10 quarters.
Armistice Capital's Prothena Corp position peaked at $32.2M in Q2 2024.
188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

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