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 $1.9T AUM 41.92% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

Squarepoint's PRTA Position: Q1 2026 in Review

Squarepoint increased its Prothena Corp (PRTA) stake by 5.9% in Q1 2026, buying an estimated $118K and bringing the position to 230,920 shares worth $2.24M. The position accounts for ﹤0.01% of the portfolio, ranked #2100.

Squarepoint first reported a position in PRTA in Q4 2015 and has held it in 23 quarters since. The position peaked at $3.8M in Q1 2023. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Squarepoint held 230,920 shares of Prothena Corp worth $2.24M as of Q1 2026.
  • Squarepoint bought 12,879 Prothena Corp shares in Q1 2026, an estimated $118K.
  • Prothena Corp made up ﹤0.01% of Squarepoint's portfolio in Q1 2026, its #2100 holding.
  • Squarepoint first reported a position in Prothena Corp in Q4 2015 and has held it in 23 quarters since.
  • Squarepoint's Prothena Corp position peaked at $3.8M in Q1 2023.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

Based on Squarepoint's 13F filing for Q1 2026, filed 15 May 2026.