Squarepoint
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Squarepoint’s Prothena Corp PRTA Stock Holding History

Squarepoint’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
Q1 		– Sell
-24,300
Closed -$337K – 5232
2024
Q4 		$337K Buy
+24,300
New +$383K ﹤0.01% 4067

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Rubric Capital Management (New York)
Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
ADAR1 Capital Management
ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
Palo Alto Investors
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Squarepoint's PRTA Position: Q2 2026 in Review

Squarepoint reduced its Prothena Corp (PRTA) stake by 3% in Q2 2026, selling an estimated $68.6K and leaving 223,971 shares worth $2.19M. The position accounts for ﹤0.01% of the portfolio, ranked #2270.

Squarepoint first reported a position in PRTA in Q4 2015 and has held it in 24 quarters since. The position peaked at $3.8M in Q1 2023. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Squarepoint held 223,971 shares of Prothena Corp worth $2.19M as of Q2 2026.
  • Squarepoint sold 6,949 Prothena Corp shares in Q2 2026, an estimated $68.6K.
  • Prothena Corp made up ﹤0.01% of Squarepoint's portfolio in Q2 2026, its #2270 holding.
  • Squarepoint first reported a position in Prothena Corp in Q4 2015 and has held it in 24 quarters since.
  • Squarepoint's Prothena Corp position peaked at $3.8M in Q1 2023.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

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