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 $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

AllianceBernstein's PRTA Position: Q1 2026 in Review

AllianceBernstein held its Prothena Corp (PRTA) position steady in Q1 2026 at 69,607 shares worth $665K. The position accounts for ﹤0.01% of the portfolio, ranked #2503.

AllianceBernstein first reported a position in PRTA in Q2 2013 and has held it in 52 quarters since. The position peaked at $58.6M in Q3 2017. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • AllianceBernstein held 69,607 shares of Prothena Corp worth $665K as of Q1 2026.
  • AllianceBernstein left its Prothena Corp share count unchanged in Q1 2026.
  • Prothena Corp made up ﹤0.01% of AllianceBernstein's portfolio in Q1 2026, its #2503 holding.
  • AllianceBernstein first reported a position in Prothena Corp in Q2 2013 and has held it in 52 quarters since.
  • AllianceBernstein's Prothena Corp position peaked at $58.6M in Q3 2017.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

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