TI
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Trexquant Investment’s Prothena Corp PRTA Stock Holding History

Trexquant Investment’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 		$751K Buy
76,731
+52,188
+213% +$515K ﹤0.01% 1548
2026
Q1 		$239K Buy
24,543
+5,159
+27% +$47.3K ﹤0.01% 1640
2025
Q4 		$185K Sell
19,384
-259,595
-93% -$2.64M ﹤0.01% 1525
2025
Q3 		$2.72M Sell
278,979
-273,847
-50% -$2.1M 0.03% 789
2025
Q2 		$3.36M Buy
+552,826
New +$4.15M 0.04% 691
2024
Q1 		– Sell
-67,683
Closed -$2.46M – 1713
2023
Q4 		$2.46M Buy
67,683
+10,840
+19% +$417K 0.06% 486
2023
Q3 		$2.74M Buy
+56,843
New +$3.38M 0.07% 397
2023
Q2 		– Sell
-42,200
Closed -$2.05M – 1729
2023
Q1 		$2.05M Buy
42,200
+10,963
+35% +$579K 0.06% 451
2022
Q4 		$1.88M Buy
+31,237
New +$1.83M 0.05% 426
2022
Q1 		– Sell
-5,866
Closed -$290K – 1646
2021
Q4 		$290K Buy
+5,866
New +$325K 0.02% 933
2021
Q3 		– Sell
-7,326
Closed -$377K – 1414
2021
Q2 		$377K Buy
+7,326
New +$229K 0.03% 612
2020
Q4 		– Sell
-47,039
Closed -$470K – 1397
2020
Q3 		$470K Sell
47,039
-7,102
-13% -$85.4K 0.03% 720
2020
Q2 		$566K Buy
+54,141
New +$602K 0.04% 628
2019
Q1 		– Sell
-19,657
Closed -$202K – 1243
2018
Q4 		$202K Sell
19,657
-3,342
-15% -$39.7K 0.01% 912
2018
Q3 		$301K Buy
+22,999
New +$332K 0.02% 687
2018
Q2 		– Sell
-26,465
Closed -$972K – 1138
2018
Q1 		$972K Buy
+26,465
New +$963K 0.07% 417
2017
Q1 		– Sell
-7,613
Closed -$374K – 1274
2016
Q4 		$374K Buy
7,613
+3,400
+81% +$188K 0.06% 559
2016
Q3 		$253K Sell
4,213
-16,206
-79% -$869K 0.06% 550
2016
Q2 		$714K Buy
20,419
+13,124
+180% +$572K 0.09% 343
2016
Q1 		$300K Buy
+7,295
New +$285K 0.04% 735
2015
Q1 		– Sell
-19,636
Closed -$407K – 1147
2014
Q4 		$407K Buy
+19,636
New +$410K 0.07% 548

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

Trexquant Investment's PRTA Position: Q2 2026 in Review

Trexquant Investment increased its Prothena Corp (PRTA) stake by 213% in Q2 2026, buying an estimated $515K and bringing the position to 76,731 shares worth $751K. The position accounts for ﹤0.01% of the portfolio, ranked #1548.

Trexquant Investment first reported a position in PRTA in Q4 2014 and has held it in 21 quarters since. The position peaked at $3.36M in Q2 2025. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Trexquant Investment held 76,731 shares of Prothena Corp worth $751K as of Q2 2026.
  • Trexquant Investment bought 52,188 Prothena Corp shares in Q2 2026, an estimated $515K.
  • Prothena Corp made up ﹤0.01% of Trexquant Investment's portfolio in Q2 2026, its #1548 holding.
  • Trexquant Investment first reported a position in Prothena Corp in Q4 2014 and has held it in 21 quarters since.
  • Trexquant Investment's Prothena Corp position peaked at $3.36M in Q2 2025.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

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