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Oppenheimer & Co’s Prothena Corp PRTA Stock Holding History

Oppenheimer & Co’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
-11,660
Closed -$114K – 1707
2025
Q3 		$114K Sell
11,660
-6,935
-37% -$53.3K ﹤0.01% 1604
2025
Q2 		$113K Buy
+18,595
New +$140K ﹤0.01% 1555
2024
Q1 		– Sell
-6,326
Closed -$230K – 1497
2023
Q4 		$230K Sell
6,326
-1,582
-20% -$60.9K ﹤0.01% 1239
2023
Q3 		$382K Buy
7,908
+295
+4% +$17.5K 0.01% 1045
2023
Q2 		$520K Buy
7,613
+343
+5% +$22.1K 0.01% 954
2023
Q1 		$352K Buy
+7,270
New +$384K 0.01% 1085
2022
Q1 		– Sell
-4,549
Closed -$225K – 1560
2021
Q4 		$225K Sell
4,549
-214
-4% -$11.9K ﹤0.01% 1351
2021
Q3 		$339K Buy
+4,763
New +$296K 0.01% 1174
2018
Q4 		– Sell
-10,705
Closed -$140K – 1335
2018
Q3 		$140K Sell
10,705
-750
-7% -$10.8K ﹤0.01% 1284
2018
Q2 		$166K Buy
11,455
+3,700
+48% +$73.1K ﹤0.01% 1245
2018
Q1 		$284K Buy
+7,755
New +$282K 0.01% 1088
2014
Q4 		– Sell
-11,030
Closed -$245K – 1462
2014
Q3 		$245K Buy
+11,030
New +$234K 0.01% 1158

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

Oppenheimer & Co's PRTA Position: Q4 2025 in Review

Oppenheimer & Co sold out of Prothena Corp (PRTA) in Q4 2025, closing a stake of 11,660 shares — an estimated $114K sold.

Oppenheimer & Co first reported a position in PRTA in Q3 2014 and held it in 12 quarters. The position peaked at $520K in Q2 2023. 181 funds tracked by Wall St. Rank hold PRTA as of Q4 2025.

  • Oppenheimer & Co reported no remaining Prothena Corp position as of Q4 2025 after selling out during the quarter.
  • Oppenheimer & Co sold 11,660 Prothena Corp shares in Q4 2025, an estimated $114K.
  • Oppenheimer & Co first reported a position in Prothena Corp in Q3 2014 and held it in 12 quarters.
  • Oppenheimer & Co's Prothena Corp position peaked at $520K in Q2 2023.
  • 181 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2025.

Based on Oppenheimer & Co's 13F filing for Q4 2025, filed 2 Feb 2026.