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Polymer Capital Management’s Prothena Corp PRTA Stock Holding History

Polymer 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
2026
Q1 		– Sell
-23,513
Closed -$225K – 988
2025
Q4 		$225K Buy
+23,513
New +$239K 0.02% 687

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
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
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
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Polymer Capital Management's PRTA Position: Q1 2026 in Review

Polymer Capital Management sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 23,513 shares — an estimated $225K sold.

Polymer Capital Management first reported a position in PRTA in Q4 2025 and held it in 1 quarter. The position peaked at $225K in Q4 2025. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Polymer Capital Management reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
  • Polymer Capital Management sold 23,513 Prothena Corp shares in Q1 2026, an estimated $225K.
  • Polymer Capital Management first reported a position in Prothena Corp in Q4 2025 and held it in 1 quarter.
  • Polymer Capital Management's Prothena Corp position peaked at $225K in Q4 2025.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

Based on Polymer Capital Management's 13F filing for Q1 2026, filed 14 May 2026.