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Atom Investors’s Prothena Corp PRTA Stock Holding History

Atom Investors’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
Q1 		– Sell
-17,026
Closed -$163K – 802
2025
Q4 		$163K Sell
17,026
-4,289
-20% -$43.7K 0.01% 511
2025
Q3 		$208K Buy
+21,315
New +$164K 0.02% 506
2024
Q2 		– Sell
-9,303
Closed -$230K – 629
2024
Q1 		$230K Buy
+9,303
New +$277K 0.03% 467

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
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
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
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Atom Investors's PRTA Position: Q1 2026 in Review

Atom Investors sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 17,026 shares — an estimated $163K sold.

Atom Investors first reported a position in PRTA in Q1 2024 and held it in 3 quarters. The position peaked at $230K in Q1 2024. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Atom Investors reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
  • Atom Investors sold 17,026 Prothena Corp shares in Q1 2026, an estimated $163K.
  • Atom Investors first reported a position in Prothena Corp in Q1 2024 and held it in 3 quarters.
  • Atom Investors's Prothena Corp position peaked at $230K in Q1 2024.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

Based on Atom Investors's 13F filing for Q1 2026, filed 15 May 2026.