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Israel Englander’s Prothena Corp PRTA Stock Holding History

Israel Englander’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
-40,000
Closed -$2.42M – 6936
2022
Q3 		$2.42M Buy
+40,000
New +$1.26M ﹤0.01% 3568
2014
Q2 		– Sell
-88,900
Closed -$2.47M – 3769
2014
Q1 		$2.47M Buy
+88,900
New +$2.87M 0.01% 1629

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

Israel Englander's PRTA Position: Q1 2026 in Review

Israel Englander sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 21,976 shares — an estimated $201K sold.

Israel Englander first reported a position in PRTA in Q3 2013 and held it in 47 quarters. The position peaked at $32M in Q1 2018. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Israel Englander reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
  • Israel Englander sold 21,976 Prothena Corp shares in Q1 2026, an estimated $201K.
  • Israel Englander first reported a position in Prothena Corp in Q3 2013 and held it in 47 quarters.
  • Israel Englander's Prothena Corp position peaked at $32M in Q1 2018.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

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