Marshall Wace
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Marshall Wace’s Prothena Corp PRTA Stock Holding History

Marshall Wace’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 		$433K Sell
44,574
-10,204
-19% -$93.5K ﹤0.01% 2505
2025
Q4 		$523K Buy
+54,778
New +$558K ﹤0.01% 2220
2023
Q3 		– Sell
-10,869
Closed -$742K – 2575
2023
Q2 		$742K Buy
+10,869
New +$701K ﹤0.01% 1838
2022
Q4 		– Sell
-107,803
Closed -$6.54M – 3320
2022
Q3 		$6.54M Sell
107,803
-70,584
-40% -$2.23M 0.01% 1183
2022
Q2 		$4.84M Buy
178,387
+167,861
+1,595% +$4.91M 0.01% 1366
2022
Q1 		$385K Sell
10,526
-204,165
-95% -$7.36M ﹤0.01% 2891
2021
Q4 		$10.6M Buy
214,691
+145,799
+212% +$8.08M 0.02% 830
2021
Q3 		$4.91M Buy
+68,892
New +$4.28M 0.02% 949
2021
Q2 		– Sell
-23,553
Closed -$591K – 2998
2021
Q1 		$591K Sell
23,553
-39,520
-63% -$744K ﹤0.01% 1879
2020
Q4 		$758K Buy
+63,073
New +$746K ﹤0.01% 1322
2019
Q3 		– Sell
-173,557
Closed -$1.83M – 1884
2019
Q2 		$1.83M Buy
+173,557
New +$1.78M 0.02% 790
2018
Q4 		– Sell
-14,633
Closed -$191K – 1763
2018
Q3 		$191K Buy
+14,633
New +$211K ﹤0.01% 1073
2016
Q2 		– Sell
-117,937
Closed -$4.85M – 1126
2016
Q1 		$4.85M Buy
+117,937
New +$4.62M 0.05% 351
2015
Q3 		– Sell
-222,360
Closed -$11.7M – 1025
2015
Q2 		$11.7M Buy
222,360
+204,290
+1,131% +$8.06M 0.15% 154
2015
Q1 		$689K Buy
+18,070
New +$464K 0.01% 632
2014
Q4 		– Sell
-43,486
Closed -$964K – 928
2014
Q3 		$964K Sell
43,486
-8,759
-17% -$186K 0.01% 557
2014
Q2 		$1.18M Buy
+52,245
New +$1.31M 0.02% 485

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

Marshall Wace's PRTA Position: Q1 2026 in Review

Marshall Wace reduced its Prothena Corp (PRTA) stake by 19% in Q1 2026, selling an estimated $93.5K and leaving 44,574 shares worth $433K. The position accounts for ﹤0.01% of the portfolio, ranked #2505.

Marshall Wace first reported a position in PRTA in Q2 2014 and has held it in 17 quarters since. The position peaked at $11.7M in Q2 2015. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Marshall Wace held 44,574 shares of Prothena Corp worth $433K as of Q1 2026.
  • Marshall Wace sold 10,204 Prothena Corp shares in Q1 2026, an estimated $93.5K.
  • Prothena Corp made up ﹤0.01% of Marshall Wace's portfolio in Q1 2026, its #2505 holding.
  • Marshall Wace first reported a position in Prothena Corp in Q2 2014 and has held it in 17 quarters since.
  • Marshall Wace's Prothena Corp position peaked at $11.7M in Q2 2015.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

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