Vanguard Portfolio Management
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Vanguard Portfolio Management’s Prothena Corp PRTA Stock Holding History

Vanguard Portfolio 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 		$16.2M Buy
1,651,293
+205,314
+14% +$2.03M ﹤0.01% 2052
2026
Q1 		$14.1M Buy
+1,445,979
New +$13.3M ﹤0.01% 2015

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
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 96.49% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Vanguard Portfolio Management's PRTA Position: Q2 2026 in Review

Vanguard Portfolio Management increased its Prothena Corp (PRTA) stake by 14% in Q2 2026, buying an estimated $2.03M and bringing the position to 1,651,293 shares worth $16.2M. The position accounts for ﹤0.01% of the portfolio, ranked #2052.

Vanguard Portfolio Management first reported a position in PRTA in Q1 2026 and has held it in 2 quarters since. 186 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Vanguard Portfolio Management held 1,651,293 shares of Prothena Corp worth $16.2M as of Q2 2026.
  • Vanguard Portfolio Management bought 205,314 Prothena Corp shares in Q2 2026, an estimated $2.03M.
  • Prothena Corp made up ﹤0.01% of Vanguard Portfolio Management's portfolio in Q2 2026, its #2052 holding.
  • Vanguard Portfolio Management first reported a position in Prothena Corp in Q1 2026 and has held it in 2 quarters since.
  • 186 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Vanguard Portfolio Management's 13F filing for Q2 2026, filed 13 Aug 2026.