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Dmitry Balyasny’s Prothena Corp PRTA Stock Holding History

Dmitry Balyasny’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
-55,764
Closed -$544K – 3471
2025
Q3 		$544K Sell
55,764
-520,028
-90% -$4M ﹤0.01% 2364
2025
Q2 		$3.5M Buy
+575,792
New +$4.32M 0.01% 1470
2025
Q1 		– Sell
-38,021
Closed -$527K – 3190
2024
Q4 		$527K Buy
+38,021
New +$600K ﹤0.01% 2181
2023
Q1 		– Sell
-1,115
Closed -$67.2K – 3051
2022
Q4 		$67.2K Sell
1,115
-5,400
-83% -$316K ﹤0.01% 2307
2022
Q3 		$395K Sell
6,515
-27,862
-81% -$881K ﹤0.01% 2104
2022
Q2 		$933K Buy
+34,377
New +$1.01M ﹤0.01% 1784
2020
Q1 		– Sell
-120,000
Closed -$1.9M – 1446
2019
Q4 		$1.9M Buy
+120,000
New +$1.29M 0.01% 766
2018
Q3 		– Sell
-31,611
Closed -$461K – 1966
2018
Q2 		$461K Buy
31,611
+22,202
+236% +$439K ﹤0.01% 1376
2018
Q1 		$345K Buy
+9,409
New +$342K ﹤0.01% 1570
2014
Q4 		– Sell
-139,248
Closed -$3.09M – 808
2014
Q3 		$3.09M Sell
139,248
-36,363
-21% -$771K 0.02% 552
2014
Q2 		$3.96M Buy
+175,611
New +$4.39M 0.04% 424

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

Dmitry Balyasny's PRTA Position: Q4 2025 in Review

Dmitry Balyasny sold out of Prothena Corp (PRTA) in Q4 2025, closing a stake of 55,764 shares — an estimated $544K sold.

Dmitry Balyasny first reported a position in PRTA in Q2 2014 and held it in 11 quarters. The position peaked at $3.96M in Q2 2014. 181 funds tracked by Wall St. Rank hold PRTA as of Q4 2025.

  • Dmitry Balyasny reported no remaining Prothena Corp position as of Q4 2025 after selling out during the quarter.
  • Dmitry Balyasny sold 55,764 Prothena Corp shares in Q4 2025, an estimated $544K.
  • Dmitry Balyasny first reported a position in Prothena Corp in Q2 2014 and held it in 11 quarters.
  • Dmitry Balyasny's Prothena Corp position peaked at $3.96M in Q2 2014.
  • 181 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2025.

Based on Balyasny Asset Management's 13F filing for Q4 2025, filed 17 Feb 2026.