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Prosight Management’s Prothena Corp PRTA Stock Holding History

Prosight Management’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
-20,000
Closed -$195K – 48
2025
Q3 		$195K Sell
20,000
-247,800
-93% -$1.9M 0.05% 40
2025
Q2 		$1.63M Sell
267,800
-140,322
-34% -$1.05M 0.4% 33
2025
Q1 		$5.05M Sell
408,122
-10,000
-2% -$141K 1.66% 22
2024
Q4 		$5.79M Sell
418,122
-65,345
-14% -$1.03M 1.6% 21
2024
Q3 		$8.09M Buy
483,467
+196,541
+68% +$4.23M 1.99% 20
2024
Q2 		$5.92M Buy
286,926
+116,457
+68% +$2.52M 1.77% 20
2024
Q1 		$4.22M Sell
170,469
-59,070
-26% -$1.76M 1.17% 23
2023
Q4 		$8.34M Buy
229,539
+103,337
+82% +$3.98M 3.35% 13
2023
Q3 		$6.09M Buy
126,202
+6,202
+5% +$368K 1.93% 16
2023
Q2 		$8.19M Sell
120,000
-327,092
-73% -$21.1M 2.4% 15
2023
Q1 		$21.7M Buy
447,092
+117,092
+35% +$6.19M 10.27% 1
2022
Q4 		$19.9M Buy
330,000
+8,907
+3% +$522K 10.84% 2
2022
Q3 		$19.5M Sell
321,093
-228,907
-42% -$7.24M 10.43% 1
2022
Q2 		$14.9M Sell
550,000
-16,538
-3% -$484K 11.77% 2
2022
Q1 		$20.7M Buy
566,538
+125,538
+28% +$4.53M 13.38% 2
2021
Q4 		$21.8M Buy
441,000
+117,700
+36% +$6.53M 13.04% 1
2021
Q3 		$23M Sell
323,300
-98,700
-23% -$6.13M 12.67% 1
2021
Q2 		$21.7M Sell
422,000
-178,000
-30% -$5.55M 13.57% 1
2021
Q1 		$15.1M Sell
600,000
-491,202
-45% -$9.24M 12.34% 1
2020
Q4 		$13.1M Buy
1,091,202
+546,007
+100% +$6.46M 6.06% 3
2020
Q3 		$5.45M Buy
+545,195
New +$6.56M 2.59% 16

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

Prosight Management's PRTA Position: Q4 2025 in Review

Prosight Management sold out of Prothena Corp (PRTA) in Q4 2025, closing a stake of 20,000 shares — an estimated $195K sold.

Prosight Management first reported a position in PRTA in Q3 2020 and held it in 21 quarters. The position peaked at $23M in Q3 2021. 181 funds tracked by Wall St. Rank hold PRTA as of Q4 2025.

  • Prosight Management reported no remaining Prothena Corp position as of Q4 2025 after selling out during the quarter.
  • Prosight Management sold 20,000 Prothena Corp shares in Q4 2025, an estimated $195K.
  • Prosight Management first reported a position in Prothena Corp in Q3 2020 and held it in 21 quarters.
  • Prosight Management's Prothena Corp position peaked at $23M in Q3 2021.
  • 181 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2025.

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