JP Morgan Chase
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JP Morgan Chase’s Prothena Corp PRTA Stock Holding History

JP Morgan Chase’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
2022
Q4 		– Sell
-249,900
Closed -$15.2M – 6902
2022
Q3 		$15.2M Hold
249,900
– – ﹤0.01% 1799
2022
Q2 		$6.79M Buy
249,900
+116,100
+87% +$3.4M ﹤0.01% 2497
2022
Q1 		$4.89M Buy
+133,800
New +$4.82M ﹤0.01% 3021

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

JP Morgan Chase's PRTA Position: Q1 2026 in Review

JP Morgan Chase reduced its Prothena Corp (PRTA) stake by 85% in Q1 2026, selling an estimated $1.32M and leaving 25,967 shares worth $240K. The position accounts for ﹤0.01% of the portfolio, ranked #5394.

JP Morgan Chase first reported a position in PRTA in Q3 2013 and has held it in 48 quarters since. The position peaked at $28.3M in Q2 2023. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • JP Morgan Chase held 25,967 shares of Prothena Corp worth $240K as of Q1 2026.
  • JP Morgan Chase sold 143,988 Prothena Corp shares in Q1 2026, an estimated $1.32M.
  • Prothena Corp made up ﹤0.01% of JP Morgan Chase's portfolio in Q1 2026, its #5394 holding.
  • JP Morgan Chase first reported a position in Prothena Corp in Q3 2013 and has held it in 48 quarters since.
  • JP Morgan Chase's Prothena Corp position peaked at $28.3M in Q2 2023.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

Based on JP Morgan Chase's 13F filing for Q1 2026, filed 13 May 2026.