AllianceBernstein
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AllianceBernstein’s Prothena Corp PRTA Stock Holding History

AllianceBernstein’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
2018
Q2 		– Sell
-75,000
Closed -$2.75M – 3138
2018
Q1 		$2.75M Buy
+75,000
New +$2.73M ﹤0.01% 1612

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

AllianceBernstein's PRTA Position: Q2 2026 in Review

AllianceBernstein reduced its Prothena Corp (PRTA) stake by 0.56% in Q2 2026, selling an estimated $3.85K and leaving 69,217 shares worth $673K. The position accounts for ﹤0.01% of the portfolio, ranked #2565.

AllianceBernstein first reported a position in PRTA in Q2 2013 and has held it in 53 quarters since. The position peaked at $58.6M in Q3 2017. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • AllianceBernstein held 69,217 shares of Prothena Corp worth $673K as of Q2 2026.
  • AllianceBernstein sold 390 Prothena Corp shares in Q2 2026, an estimated $3.85K.
  • Prothena Corp made up ﹤0.01% of AllianceBernstein's portfolio in Q2 2026, its #2565 holding.
  • AllianceBernstein first reported a position in Prothena Corp in Q2 2013 and has held it in 53 quarters since.
  • AllianceBernstein's Prothena Corp position peaked at $58.6M in Q3 2017.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on AllianceBernstein's 13F filing for Q2 2026, filed 14 Aug 2026.