CM
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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
-61,009
Closed -$583K – 1954
2025
Q4 		$583K Hold
61,009
– – ﹤0.01% 1214
2025
Q3 		$595K Sell
61,009
-4,091
-6% -$31.4K ﹤0.01% 1258
2025
Q2 		$395K Buy
+65,100
New +$489K ﹤0.01% 1164
2025
Q1 		– Sell
-24,000
Closed -$332K – 1935
2024
Q4 		$332K Buy
+24,000
New +$379K ﹤0.01% 1193
2024
Q1 		– Sell
-45,892
Closed -$1.67M – 1594
2023
Q4 		$1.67M Buy
+45,892
New +$1.77M 0.02% 665
2021
Q2 		– Sell
-21,000
Closed -$655K – 1515
2021
Q1 		$528K Buy
+21,000
New +$395K 0.01% 793

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

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.