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Cornerstone Financial Management’s Prothena Corp PRTA Stock Holding History

Cornerstone Financial 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 		$538 Hold
55
– – ﹤0.01% 1339
2026
Q1 		$535 Buy
+55
New +$504 ﹤0.01% 1149

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 Financial Management's PRTA Position: Q2 2026 in Review

Cornerstone Financial Management held its Prothena Corp (PRTA) position steady in Q2 2026 at 55 shares worth $538. The position accounts for ﹤0.01% of the portfolio, ranked #1339.

Cornerstone Financial Management first reported a position in PRTA in Q1 2026 and has held it in 2 quarters since. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Cornerstone Financial Management held 55 shares of Prothena Corp worth $538 as of Q2 2026.
  • Cornerstone Financial Management left its Prothena Corp share count unchanged in Q2 2026.
  • Prothena Corp made up ﹤0.01% of Cornerstone Financial Management's portfolio in Q2 2026, its #1339 holding.
  • Cornerstone Financial Management first reported a position in Prothena Corp in Q1 2026 and has held it in 2 quarters since.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Cornerstone Financial Management's 13F filing for Q2 2026, filed 12 Aug 2026.