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MAI Capital Management’s Prothena Corp PRTA Stock Holding History

MAI 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 		– Sell
-10
Closed -$98 – 4043
2026
Q1 		$98 Hold
10
– – ﹤0.01% 4760
2025
Q4 		$96 Buy
+10
New +$102 ﹤0.01% 4170
2025
Q3 		– Sell
-155
Closed -$941 – 4065
2025
Q2 		$941 Buy
+155
New +$1.16K ﹤0.01% 3638

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

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

MAI Capital Management sold out of Prothena Corp (PRTA) in Q2 2026, closing a stake of 10 shares — an estimated $98 sold.

MAI Capital Management first reported a position in PRTA in Q2 2025 and held it in 3 quarters. The position peaked at $941 in Q2 2025. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • MAI Capital Management reported no remaining Prothena Corp position as of Q2 2026 after selling out during the quarter.
  • MAI Capital Management sold 10 Prothena Corp shares in Q2 2026, an estimated $98.
  • MAI Capital Management first reported a position in Prothena Corp in Q2 2025 and held it in 3 quarters.
  • MAI Capital Management's Prothena Corp position peaked at $941 in Q2 2025.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

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