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Algert Global’s Prothena Corp PRTA Stock Holding History

Algert Global’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
Q4 		– Sell
-445,811
Closed -$4.35M – 1286
2025
Q3 		$4.35M Buy
445,811
+397,661
+826% +$3.06M 0.07% 447
2025
Q2 		$292K Buy
+48,150
New +$361K 0.01% 1031
2024
Q4 		– Sell
-72,961
Closed -$1.22M – 1294
2024
Q3 		$1.22M Sell
72,961
-4,230
-5% -$90.9K 0.03% 709
2024
Q2 		$1.59M Buy
77,191
+28,841
+60% +$624K 0.05% 539
2024
Q1 		$1.2M Sell
48,350
-908
-2% -$27K 0.05% 569
2023
Q4 		$1.79M Buy
49,258
+21,258
+76% +$818K 0.07% 448
2023
Q3 		$1.35M Buy
+28,000
New +$1.66M 0.06% 495
2023
Q1 		– Sell
-19,203
Closed -$1.16M – 1274
2022
Q4 		$1.16M Buy
19,203
+10,533
+121% +$617K 0.06% 516
2022
Q3 		$526K Buy
+8,670
New +$274K 0.03% 785
2022
Q2 		– Sell
-16,875
Closed -$617K – 1342
2022
Q1 		$617K Buy
+16,875
New +$608K 0.04% 738

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
RCMNY
Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
AC
Armistice Capital New York $8.17B AUM 68.82% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Algert Global's PRTA Position: Q4 2025 in Review

Algert Global sold out of Prothena Corp (PRTA) in Q4 2025, closing a stake of 445,811 shares — an estimated $4.35M sold.

Algert Global first reported a position in PRTA in Q1 2022 and held it in 10 quarters. The position peaked at $4.35M in Q3 2025. 181 funds tracked by Wall St. Rank hold PRTA as of Q4 2025.

  • Algert Global reported no remaining Prothena Corp position as of Q4 2025 after selling out during the quarter.
  • Algert Global sold 445,811 Prothena Corp shares in Q4 2025, an estimated $4.35M.
  • Algert Global first reported a position in Prothena Corp in Q1 2022 and held it in 10 quarters.
  • Algert Global's Prothena Corp position peaked at $4.35M in Q3 2025.
  • 181 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2025.

Based on Algert Global's 13F filing for Q4 2025, filed 17 Feb 2026.