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Caption Management’s Prothena Corp PRTA Stock Holding History

Caption 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
-100,000
Closed -$955K – 1955
2025
Q4 		$955K Hold
100,000
– – 0.01% 1069
2025
Q3 		$976K Hold
100,000
– – 0.01% 1113
2025
Q2 		$607K Buy
+100,000
New +$751K 0.01% 1065
2024
Q1 		– Sell
-138,100
Closed -$5.02M – 1595
2023
Q4 		$5.02M Buy
+138,100
New +$5.32M 0.07% 337
2023
Q3 		– Sell
-14,900
Closed -$1.02M – 1488
2023
Q2 		$1.02M Buy
+14,900
New +$961K 0.02% 660
2022
Q4 		– Sell
-125,000
Closed -$7.58M – 1631
2022
Q3 		$7.58M Buy
+125,000
New +$3.95M 0.1% 230

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

Caption Management's PRTA Position: Q1 2026 in Review

Caption Management sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 61,009 shares — an estimated $583K sold.

Caption Management first reported a position in PRTA in Q1 2021 and held it in 6 quarters. The position peaked at $1.67M in Q4 2023. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Caption Management reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
  • Caption Management sold 61,009 Prothena Corp shares in Q1 2026, an estimated $583K.
  • Caption Management first reported a position in Prothena Corp in Q1 2021 and held it in 6 quarters.
  • Caption Management's Prothena Corp position peaked at $1.67M in Q4 2023.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

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