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Cubist Systematic Strategies’s Prothena Corp PRTA Stock Holding History

Cubist Systematic Strategies’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
2025
Q3 		$1.86M Sell
190,949
-310,815
-62% -$2.39M 0.01% 1605
2025
Q2 		$3.05M Buy
+501,764
New +$3.77M 0.01% 1325
2024
Q2 		– Sell
-135,321
Closed -$3.35M – 3800
2024
Q1 		$3.35M Buy
135,321
+125,442
+1,270% +$3.73M 0.02% 1246
2023
Q4 		$359K Buy
+9,879
New +$380K ﹤0.01% 2701
2023
Q3 		– Sell
-3,159
Closed -$216K – 3808
2023
Q2 		$216K Sell
3,159
-37,741
-92% -$2.43M ﹤0.01% 2782
2023
Q1 		$1.98M Buy
40,900
+181
+0.4% +$9.56K 0.01% 1682
2022
Q4 		$2.45M Buy
40,719
+22,999
+130% +$1.35M 0.01% 1679
2022
Q3 		$1.07M Buy
17,720
+5,140
+41% +$162K 0.01% 2565
2022
Q2 		$342K Buy
12,580
+4,306
+52% +$126K ﹤0.01% 3340
2022
Q1 		$303K Sell
8,274
-34,331
-81% -$1.24M ﹤0.01% 2836
2021
Q4 		$2.1M Buy
42,605
+343
+0.8% +$19K 0.02% 1320
2021
Q3 		$3.01M Buy
42,262
+14,732
+54% +$915K 0.04% 752
2021
Q2 		$1.42M Buy
27,530
+10,309
+60% +$322K 0.02% 1330
2021
Q1 		$433K Buy
+17,221
New +$324K 0.01% 2037
2020
Q4 		– Sell
-23,519
Closed -$235K – 2681
2020
Q3 		$235K Buy
23,519
+11,633
+98% +$140K ﹤0.01% 2073
2020
Q2 		$124K Buy
11,886
+4,867
+69% +$54.1K ﹤0.01% 2155
2020
Q1 		$75K Sell
7,019
-7,757
-52% -$94K ﹤0.01% 1952
2019
Q4 		$234K Buy
14,776
+172
+1% +$1.84K ﹤0.01% 1974
2019
Q3 		$114K Sell
14,604
-31,149
-68% -$277K ﹤0.01% 1908
2019
Q2 		$484K Buy
45,753
+31,665
+225% +$325K 0.01% 1491
2019
Q1 		$171K Buy
14,088
+2,890
+26% +$36.1K 0.01% 1853
2018
Q4 		$115K Buy
+11,198
New +$133K 0.01% 1733
2017
Q3 		– Sell
-5,305
Closed -$287K – 1960
2017
Q2 		$287K Buy
+5,305
New +$283K 0.02% 1063
2016
Q1 		– Sell
-4,978
Closed -$339K – 1785
2015
Q4 		$339K Buy
4,978
+3,255
+189% +$196K 0.02% 1048
2015
Q3 		$78K Buy
1,723
+546
+46% +$31.8K ﹤0.01% 1668
2015
Q2 		$62K Buy
+1,177
New +$46.5K ﹤0.01% 1691

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
AC
Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Cubist Systematic Strategies's PRTA Position: Q3 2025 in Review

Cubist Systematic Strategies reduced its Prothena Corp (PRTA) stake by 62% in Q3 2025, selling an estimated $2.39M and leaving 190,949 shares worth $1.86M. The position accounts for 0.01% of the portfolio, ranked #1605.

Cubist Systematic Strategies first reported a position in PRTA in Q2 2015 and has held it in 26 quarters since. The position peaked at $3.35M in Q1 2024. 187 funds tracked by Wall St. Rank hold PRTA as of Q3 2025.

  • Cubist Systematic Strategies held 190,949 shares of Prothena Corp worth $1.86M as of Q3 2025.
  • Cubist Systematic Strategies sold 310,815 Prothena Corp shares in Q3 2025, an estimated $2.39M.
  • Prothena Corp made up 0.01% of Cubist Systematic Strategies's portfolio in Q3 2025, its #1605 holding.
  • Cubist Systematic Strategies first reported a position in Prothena Corp in Q2 2015 and has held it in 26 quarters since.
  • Cubist Systematic Strategies's Prothena Corp position peaked at $3.35M in Q1 2024.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2025.

Based on Cubist Systematic Strategies's 13F filing for Q3 2025, filed 14 Nov 2025.