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Graham Capital Management’s Prothena Corp PRTA Stock Holding History

Graham Capital Management’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 		$181K Buy
18,496
+5,676
+44% +$56K ﹤0.01% 1067
2026
Q1 		$125K Sell
12,820
-14,936
-54% -$137K ﹤0.01% 1013
2025
Q4 		$265K Sell
27,756
-25,637
-48% -$261K 0.01% 914
2025
Q3 		$521K Buy
53,393
+19,351
+57% +$149K 0.01% 597
2025
Q2 		$207K Buy
+34,042
New +$255K ﹤0.01% 1124

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

Graham Capital Management's PRTA Position: Q2 2026 in Review

Graham Capital Management increased its Prothena Corp (PRTA) stake by 44% in Q2 2026, buying an estimated $56K and bringing the position to 18,496 shares worth $181K. The position accounts for ﹤0.01% of the portfolio, ranked #1067.

Graham Capital Management first reported a position in PRTA in Q2 2025 and has held it in 5 quarters since. The position peaked at $521K in Q3 2025. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Graham Capital Management held 18,496 shares of Prothena Corp worth $181K as of Q2 2026.
  • Graham Capital Management bought 5,676 Prothena Corp shares in Q2 2026, an estimated $56K.
  • Prothena Corp made up ﹤0.01% of Graham Capital Management's portfolio in Q2 2026, its #1067 holding.
  • Graham Capital Management first reported a position in Prothena Corp in Q2 2025 and has held it in 5 quarters since.
  • Graham Capital Management's Prothena Corp position peaked at $521K in Q3 2025.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Graham Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.