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Winton Group’s Prothena Corp PRTA Stock Holding History

Winton Group’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 		$299K Sell
30,500
-4,200
-12% -$41.5K 0.01% 893
2026
Q1 		$337K Buy
+34,700
New +$318K 0.01% 827
2022
Q4 		– Sell
-4,039
Closed -$245K – 1015
2022
Q3 		$245K Buy
+4,039
New +$128K 0.02% 847
2020
Q1 		– Sell
-16,257
Closed -$257K – 1508
2019
Q4 		$257K Buy
+16,257
New +$174K ﹤0.01% 1402

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

Winton Group's PRTA Position: Q2 2026 in Review

Winton Group reduced its Prothena Corp (PRTA) stake by 12% in Q2 2026, selling an estimated $41.5K and leaving 30,500 shares worth $299K. The position accounts for 0.01% of the portfolio, ranked #893.

Winton Group first reported a position in PRTA in Q4 2019 and has held it in 4 quarters since. The position peaked at $337K in Q1 2026. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Winton Group held 30,500 shares of Prothena Corp worth $299K as of Q2 2026.
  • Winton Group sold 4,200 Prothena Corp shares in Q2 2026, an estimated $41.5K.
  • Prothena Corp made up 0.01% of Winton Group's portfolio in Q2 2026, its #893 holding.
  • Winton Group first reported a position in Prothena Corp in Q4 2019 and has held it in 4 quarters since.
  • Winton Group's Prothena Corp position peaked at $337K in Q1 2026.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Winton Group's 13F filing for Q2 2026, filed 7 Aug 2026.