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Steven Cohen’s Prothena Corp PRTA Stock Holding History

Steven Cohen’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
-399,830
Closed -$3.89M – 4471
2026
Q1 		$3.89M Sell
399,830
-460,188
-54% -$4.22M 0.01% 1874
2025
Q4 		$8.21M Buy
860,018
+213,272
+33% +$2.17M 0.01% 1472
2025
Q3 		$6.31M Buy
+646,746
New +$4.97M 0.01% 980
2023
Q4 		– Sell
-219,623
Closed -$10.6M – 2686
2023
Q3 		$10.6M Buy
219,623
+821
+0.4% +$48.8K 0.03% 629
2023
Q2 		$14.9M Sell
218,802
-116,191
-35% -$7.49M 0.04% 470
2023
Q1 		$16.2M Buy
334,993
+23,493
+8% +$1.24M 0.05% 414
2022
Q4 		$18.8M Buy
311,500
+143,100
+85% +$8.38M 0.06% 349
2022
Q3 		$10.2M Buy
168,400
+68,500
+69% +$2.17M 0.04% 496
2022
Q2 		$2.71M Sell
99,900
-73,100
-42% -$2.14M 0.01% 870
2022
Q1 		$6.33M Sell
173,000
-20,200
-10% -$728K 0.03% 639
2021
Q4 		$9.54M Buy
193,200
+31,300
+19% +$1.74M 0.04% 525
2021
Q3 		$11.5M Sell
161,900
-6,900
-4% -$429K 0.05% 451
2021
Q2 		$8.68M Buy
+168,800
New +$5.27M 0.04% 491
2020
Q3 		– Sell
-265,573
Closed -$2.78M – 1065
2020
Q2 		$2.78M Sell
265,573
-250,470
-49% -$2.78M 0.02% 554
2020
Q1 		$5.52M Buy
516,043
+193,743
+60% +$2.35M 0.04% 368
2019
Q4 		$5.1M Buy
+322,300
New +$3.46M 0.03% 495
2015
Q4 		– Sell
-16,900
Closed -$766K – 803
2015
Q3 		$766K Sell
16,900
-45,100
-73% -$2.63M 0.01% 640
2015
Q2 		$3.27M Buy
+62,000
New +$2.45M 0.02% 514

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

Steven Cohen's PRTA Position: Q2 2026 in Review

Steven Cohen sold out of Prothena Corp (PRTA) in Q2 2026, closing a stake of 399,830 shares — an estimated $3.89M sold.

Steven Cohen first reported a position in PRTA in Q2 2015 and held it in 18 quarters. The position peaked at $18.8M in Q4 2022. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Steven Cohen reported no remaining Prothena Corp position as of Q2 2026 after selling out during the quarter.
  • Steven Cohen sold 399,830 Prothena Corp shares in Q2 2026, an estimated $3.89M.
  • Steven Cohen first reported a position in Prothena Corp in Q2 2015 and held it in 18 quarters.
  • Steven Cohen's Prothena Corp position peaked at $18.8M in Q4 2022.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Point72 Asset Management's 13F filing for Q2 2026, filed 14 Aug 2026.