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Boxer Capital Management’s Prothena Corp PRTA Stock Holding History

Boxer Capital Management’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
Q2 		– Sell
-690,000
Closed -$8.54M – 30
2025
Q1 		$8.54M Hold
690,000
– – 2.57% 15
2024
Q4 		$9.56M Buy
+690,000
New +$10.9M 0.81% 33

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return
AC
Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return
Federated Hermes
Federated Hermes Pittsburgh, Pennsylvania $61.5B AUM 30.7% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Boxer Capital Management's PRTA Position: Q2 2025 in Review

Boxer Capital Management sold out of Prothena Corp (PRTA) in Q2 2025, closing a stake of 690,000 shares — an estimated $8.54M sold.

Boxer Capital Management first reported a position in PRTA in Q4 2024 and held it in 2 quarters. The position peaked at $9.56M in Q4 2024. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2025.

  • Boxer Capital Management reported no remaining Prothena Corp position as of Q2 2025 after selling out during the quarter.
  • Boxer Capital Management sold 690,000 Prothena Corp shares in Q2 2025, an estimated $8.54M.
  • Boxer Capital Management first reported a position in Prothena Corp in Q4 2024 and held it in 2 quarters.
  • Boxer Capital Management's Prothena Corp position peaked at $9.56M in Q4 2024.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2025.

Based on Boxer Capital Management's 13F filing for Q2 2025, filed 14 Aug 2025.