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Quadrature Capital’s Prothena Corp PRTA Stock Holding History

Quadrature 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 		$98K Buy
+10,007
New +$98.8K ﹤0.01% 1469
2026
Q1 		– Sell
-31,090
Closed -$297K – 1753
2025
Q4 		$297K Buy
31,090
+3,875
+14% +$39.4K ﹤0.01% 850
2025
Q3 		$265K Buy
27,215
+3,463
+15% +$26.6K ﹤0.01% 701
2025
Q2 		$144K Buy
+23,752
New +$178K ﹤0.01% 860

Other funds holding PRTA

Fidelity Investments
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
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 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
ACM
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
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Quadrature Capital's PRTA Position: Q2 2026 in Review

Quadrature Capital opened a new position in Prothena Corp (PRTA) in Q2 2026: 10,007 shares worth $98K. The stake represents ﹤0.01% of the portfolio and ranks #1469 among its holdings. This is a return to the name: Quadrature Capital previously reported a position in PRTA as recently as Q4 2025.

Quadrature Capital first reported a position in PRTA in Q2 2025 and has held it in 4 quarters since. The position peaked at $297K in Q4 2025. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Quadrature Capital held 10,007 shares of Prothena Corp worth $98K as of Q2 2026.
  • Prothena Corp was a new Quadrature Capital position in Q2 2026.
  • Prothena Corp made up ﹤0.01% of Quadrature Capital's portfolio in Q2 2026, its #1469 holding.
  • Quadrature Capital first reported a position in Prothena Corp in Q2 2025 and has held it in 4 quarters since.
  • Quadrature Capital's Prothena Corp position peaked at $297K in Q4 2025.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Quadrature Capital's 13F filing for Q2 2026, filed 7 Aug 2026.