Cambridge Investment Research Advisors
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Cambridge Investment Research Advisors’s Prothena Corp PRTA Stock Holding History

Cambridge Investment Research Advisors’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
-27,513
Closed -$269K – 3930
2025
Q3 		$269K Buy
27,513
+202
+0.7% +$1.55K ﹤0.01% 3207
2025
Q2 		$166K Buy
27,311
+17,147
+169% +$129K ﹤0.01% 3387
2025
Q1 		$126K Buy
+10,164
New +$144K ﹤0.01% 3318
2024
Q1 		– Sell
-5,985
Closed -$217K – 3382
2023
Q4 		$217K Buy
+5,985
New +$230K ﹤0.01% 2845

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 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 $166B AUM 43.98% 1-Year Est. Return
AC
Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

Cambridge Investment Research Advisors's PRTA Position: Q4 2025 in Review

Cambridge Investment Research Advisors sold out of Prothena Corp (PRTA) in Q4 2025, closing a stake of 27,513 shares — an estimated $269K sold.

Cambridge Investment Research Advisors first reported a position in PRTA in Q4 2023 and held it in 4 quarters. The position peaked at $269K in Q3 2025. 181 funds tracked by Wall St. Rank hold PRTA as of Q4 2025.

  • Cambridge Investment Research Advisors reported no remaining Prothena Corp position as of Q4 2025 after selling out during the quarter.
  • Cambridge Investment Research Advisors sold 27,513 Prothena Corp shares in Q4 2025, an estimated $269K.
  • Cambridge Investment Research Advisors first reported a position in Prothena Corp in Q4 2023 and held it in 4 quarters.
  • Cambridge Investment Research Advisors's Prothena Corp position peaked at $269K in Q3 2025.
  • 181 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2025.

Based on Cambridge Investment Research Advisors's 13F filing for Q4 2025, filed 5 Feb 2026.