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Fox Run Management’s Prothena Corp PRTA Stock Holding History

Fox Run 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
2026
Q2 		– Sell
-35,052
Closed -$324K – 1226
2026
Q1 		$324K Buy
35,052
+25,007
+249% +$229K 0.06% 599
2025
Q4 		$95.9K Sell
10,045
-34,287
-77% -$349K 0.01% 856
2025
Q3 		$433K Buy
+44,332
New +$341K 0.07% 554
2024
Q3 		– Sell
-18,591
Closed -$384K – 1045
2024
Q2 		$384K Buy
+18,591
New +$402K 0.07% 495
2024
Q1 		– Sell
-6,403
Closed -$233K – 1000
2023
Q4 		$233K Sell
6,403
-3,214
-33% -$124K 0.06% 589
2023
Q3 		$464K Buy
+9,617
New +$571K 0.14% 291
2022
Q4 		– Sell
-7,126
Closed -$432K – 835
2022
Q3 		$432K Sell
7,126
-5,792
-45% -$183K 0.17% 231
2022
Q2 		$351K Buy
+12,918
New +$378K 0.18% 233
2018
Q3 		– Sell
-26,113
Closed -$381K – 774
2018
Q2 		$381K Buy
+26,113
New +$516K 0.12% 344

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

Fox Run Management's PRTA Position: Q2 2026 in Review

Fox Run Management sold out of Prothena Corp (PRTA) in Q2 2026, closing a stake of 35,052 shares — an estimated $324K sold.

Fox Run Management first reported a position in PRTA in Q2 2018 and held it in 9 quarters. The position peaked at $464K in Q3 2023. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Fox Run Management reported no remaining Prothena Corp position as of Q2 2026 after selling out during the quarter.
  • Fox Run Management sold 35,052 Prothena Corp shares in Q2 2026, an estimated $324K.
  • Fox Run Management first reported a position in Prothena Corp in Q2 2018 and held it in 9 quarters.
  • Fox Run Management's Prothena Corp position peaked at $464K in Q3 2023.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Fox Run Management's 13F filing for Q2 2026, filed 4 Aug 2026.