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Rubric Capital Management (New York)’s Prothena Corp PRTA Stock Holding History

Rubric Capital Management (New York)’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 		$49M Hold
5,000,000
– – 0.45% 58
2026
Q1 		$48.6M Buy
5,000,000
+1,322,669
+36% +$12.1M 0.51% 43
2025
Q4 		$35.1M Buy
3,677,331
+2,136,958
+139% +$21.8M 0.42% 52
2025
Q3 		$15M Buy
+1,540,373
New +$11.8M 0.17% 61

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 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
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Rubric Capital Management (New York)'s PRTA Position: Q2 2026 in Review

Rubric Capital Management (New York) held its Prothena Corp (PRTA) position steady in Q2 2026 at 5,000,000 shares worth $49M. The position accounts for 0.45% of the portfolio, ranked #58.

Rubric Capital Management (New York) first reported a position in PRTA in Q3 2025 and has held it in 4 quarters since. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Rubric Capital Management (New York) held 5,000,000 shares of Prothena Corp worth $49M as of Q2 2026.
  • Rubric Capital Management (New York) left its Prothena Corp share count unchanged in Q2 2026.
  • Prothena Corp made up 0.45% of Rubric Capital Management (New York)'s portfolio in Q2 2026, its #58 holding.
  • Rubric Capital Management (New York) first reported a position in Prothena Corp in Q3 2025 and has held it in 4 quarters since.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Rubric Capital Management (New York)'s 13F filing for Q2 2026, filed 14 Aug 2026.