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Corton Capital’s Prothena Corp PRTA Stock Holding History

Corton Capital’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
2025
Q3 		$139K Buy
14,208
+244
+2% +$1.88K 0.34% 152
2025
Q2 		$84.8K Buy
+13,964
New +$105K 0.1% 319
2023
Q4 		– Sell
-9,091
Closed -$439K – 635
2023
Q3 		$439K Buy
9,091
+1,560
+21% +$92.7K 0.22% 124
2023
Q2 		$514K Buy
7,531
+3,129
+71% +$202K 0.24% 94
2023
Q1 		$213K Buy
+4,402
New +$233K 0.15% 225
2022
Q1 		– Sell
-14,352
Closed -$709K – 478
2021
Q4 		$709K Buy
+14,352
New +$796K 0.31% 53

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
AC
Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Corton Capital's PRTA Position: Q3 2025 in Review

Corton Capital increased its Prothena Corp (PRTA) stake by 1.7% in Q3 2025, buying an estimated $1.88K and bringing the position to 14,208 shares worth $139K. The position accounts for 0.34% of the portfolio, ranked #152.

Corton Capital first reported a position in PRTA in Q4 2021 and has held it in 6 quarters since. The position peaked at $709K in Q4 2021. 187 funds tracked by Wall St. Rank hold PRTA as of Q3 2025.

  • Corton Capital held 14,208 shares of Prothena Corp worth $139K as of Q3 2025.
  • Corton Capital bought 244 Prothena Corp shares in Q3 2025, an estimated $1.88K.
  • Prothena Corp made up 0.34% of Corton Capital's portfolio in Q3 2025, its #152 holding.
  • Corton Capital first reported a position in Prothena Corp in Q4 2021 and has held it in 6 quarters since.
  • Corton Capital's Prothena Corp position peaked at $709K in Q4 2021.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2025.

Based on Corton Capital's 13F filing for Q3 2025, filed 14 Nov 2025.