XT
PRTA icon

XTX Topco’s Prothena Corp PRTA Stock Holding History

XTX Topco’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 		$839K Sell
85,717
-6,609
-7% -$65.3K 0.01% 1946
2026
Q1 		$897K Buy
92,326
+37,445
+68% +$343K 0.02% 1506
2025
Q4 		$524K Buy
54,881
+39,073
+247% +$398K 0.01% 1551
2025
Q3 		$154K Buy
+15,808
New +$122K 0.01% 1928
2025
Q1 		– Sell
-18,665
Closed -$259K – 2957
2024
Q4 		$259K Buy
18,665
+3,101
+20% +$48.9K 0.02% 1345
2024
Q3 		$260K Buy
+15,564
New +$335K 0.02% 1280
2024
Q1 		– Sell
-7,264
Closed -$264K – 2220
2023
Q4 		$264K Sell
7,264
-3,848
-35% -$148K 0.06% 729
2023
Q3 		$536K Buy
+11,112
New +$660K 0.09% 357

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

XTX Topco's PRTA Position: Q2 2026 in Review

XTX Topco reduced its Prothena Corp (PRTA) stake by 7.2% in Q2 2026, selling an estimated $65.3K and leaving 85,717 shares worth $839K. The position accounts for 0.01% of the portfolio, ranked #1946.

XTX Topco first reported a position in PRTA in Q3 2023 and has held it in 8 quarters since. The position peaked at $897K in Q1 2026. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • XTX Topco held 85,717 shares of Prothena Corp worth $839K as of Q2 2026.
  • XTX Topco sold 6,609 Prothena Corp shares in Q2 2026, an estimated $65.3K.
  • Prothena Corp made up 0.01% of XTX Topco's portfolio in Q2 2026, its #1946 holding.
  • XTX Topco first reported a position in Prothena Corp in Q3 2023 and has held it in 8 quarters since.
  • XTX Topco's Prothena Corp position peaked at $897K in Q1 2026.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.