American Century Companies’s Prothena Corp PRTA Stock Holding History

American Century Companies's PRTA Position: Q2 2026 in Review

American Century Companies increased its Prothena Corp (PRTA) stake by 14% in Q2 2026, buying an estimated $109K and bringing the position to 90,644 shares worth $887K. The position accounts for ﹤0.01% of the portfolio, ranked #2430.

American Century Companies first reported a position in PRTA in Q2 2014 and has held it in 26 quarters since. The position peaked at $4M in Q4 2014. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

• American Century Companies held 90,644 shares of Prothena Corp worth $887K as of Q2 2026.
• American Century Companies bought 11,013 Prothena Corp shares in Q2 2026, an estimated $109K.
• Prothena Corp made up ﹤0.01% of American Century Companies's portfolio in Q2 2026, its #2430 holding.
• American Century Companies first reported a position in Prothena Corp in Q2 2014 and has held it in 26 quarters since.
• American Century Companies's Prothena Corp position peaked at $4M in Q4 2014.
• 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on American Century Companies's 13F filing for Q2 2026, filed 12 Aug 2026.