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
Q2 		$1.87M Buy
190,834
+146,260
+328% +$1.44M ﹤0.01% 1905
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 $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 $3.38T AUM 44.17% 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

Marshall Wace's PRTA Position: Q2 2026 in Review

Marshall Wace increased its Prothena Corp (PRTA) stake by 328% in Q2 2026, buying an estimated $1.44M and bringing the position to 190,834 shares worth $1.87M. The position accounts for ﹤0.01% of the portfolio, ranked #1905.

Marshall Wace first reported a position in PRTA in Q2 2014 and has held it in 18 quarters since. The position peaked at $11.7M in Q2 2015. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Marshall Wace held 190,834 shares of Prothena Corp worth $1.87M as of Q2 2026.
  • Marshall Wace bought 146,260 Prothena Corp shares in Q2 2026, an estimated $1.44M.
  • Prothena Corp made up ﹤0.01% of Marshall Wace's portfolio in Q2 2026, its #1905 holding.
  • Marshall Wace first reported a position in Prothena Corp in Q2 2014 and has held it in 18 quarters since.
  • Marshall Wace's Prothena Corp position peaked at $11.7M in Q2 2015.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.