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Prothena Corp Public (PRTA) Shares Outstanding (2016 - 2025)

Prothena Corp Public has reported Shares Outstanding over the past 14 years, most recently at $53.8 million for Q4 2025.

  • Quarterly results put Shares Outstanding at $53.8 million for Q4 2025, changed 0.01% from a year ago — trailing twelve months through Dec 2025 was $53.8 million (changed 0.01% YoY), and the annual figure for FY2025 was $53.8 million, changed 0.01%.
  • Shares Outstanding for Q4 2025 was $53.8 million at Prothena Corp Public, roughly flat from $53.8 million in the prior quarter.
  • Over the last five years, Shares Outstanding for PRTA hit a ceiling of $53.8 million in Q4 2025 and a floor of $44.2 million in Q1 2021.
  • Median Shares Outstanding over the past 5 years was $53.6 million (2023), compared with a mean of $51.0 million.
  • Biggest five-year swings in Shares Outstanding: increased 16.88% in 2021 and later rose 0.01% in 2025.
  • Prothena Corp Public's Shares Outstanding stood at $46.7 million in 2021, then rose by 11.67% to $52.1 million in 2022, then rose by 3.03% to $53.7 million in 2023, then increased by 0.27% to $53.8 million in 2024, then increased by 0.01% to $53.8 million in 2025.
  • The last three reported values for Shares Outstanding were $53.8 million (Q4 2025), $53.8 million (Q3 2025), and $53.8 million (Q2 2025) per Business Quant data.