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Boothbay Fund Management’s Prothena Corp PRTA Stock Holding History

Boothbay Fund 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
-30,000
Closed -$293K – 2275
2025
Q3 		$293K Buy
+30,000
New +$231K ﹤0.01% 1467
2025
Q1 		– Sell
-62,002
Closed -$877K – 1699
2024
Q4 		$859K Buy
+62,002
New +$978K 0.02% 689
2021
Q2 		– Sell
-48,162
Closed -$1.21M – 2061
2021
Q1 		$1.21M Sell
48,162
-77,087
-62% -$1.45M 0.05% 507
2020
Q4 		$1.5M Buy
+125,249
New +$1.48M 0.06% 349
2019
Q2 		– Sell
-20,000
Closed -$205K – 866
2019
Q1 		$243K Buy
+20,000
New +$250K 0.02% 562

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

Boothbay Fund Management's PRTA Position: Q4 2025 in Review

Boothbay Fund Management sold out of Prothena Corp (PRTA) in Q4 2025, closing a stake of 30,000 shares — an estimated $293K sold.

Boothbay Fund Management first reported a position in PRTA in Q1 2019 and held it in 5 quarters. The position peaked at $1.5M in Q4 2020. 181 funds tracked by Wall St. Rank hold PRTA as of Q4 2025.

  • Boothbay Fund Management reported no remaining Prothena Corp position as of Q4 2025 after selling out during the quarter.
  • Boothbay Fund Management sold 30,000 Prothena Corp shares in Q4 2025, an estimated $293K.
  • Boothbay Fund Management first reported a position in Prothena Corp in Q1 2019 and held it in 5 quarters.
  • Boothbay Fund Management's Prothena Corp position peaked at $1.5M in Q4 2020.
  • 181 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2025.

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