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Cornerstone Investment Partners’s Prothena Corp PRTA Stock Holding History

Cornerstone Investment Partners’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
-30,687
Closed -$298K – 358
2026
Q1 		$298K Buy
+30,687
New +$281K 0.01% 135

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

Cornerstone Investment Partners's PRTA Position: Q2 2026 in Review

Cornerstone Investment Partners sold out of Prothena Corp (PRTA) in Q2 2026, closing a stake of 30,687 shares — an estimated $298K sold.

Cornerstone Investment Partners first reported a position in PRTA in Q1 2026 and held it in 1 quarter. The position peaked at $298K in Q1 2026. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Cornerstone Investment Partners reported no remaining Prothena Corp position as of Q2 2026 after selling out during the quarter.
  • Cornerstone Investment Partners sold 30,687 Prothena Corp shares in Q2 2026, an estimated $298K.
  • Cornerstone Investment Partners first reported a position in Prothena Corp in Q1 2026 and held it in 1 quarter.
  • Cornerstone Investment Partners's Prothena Corp position peaked at $298K in Q1 2026.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Cornerstone Investment Partners's 13F filing for Q2 2026, filed 7 Aug 2026.