Prothena Corp Public (PRTA) Tax Rate (2012 - 2026)

Prothena Corp Public's Tax Rate history runs 15 years deep, the most recent figure standing at 0.0% for Q1 2026.

• In Q1 2026, Tax Rate fell 192.0% year-over-year to 0.0%; the TTM figure through Mar 2026 stood at 41.61% (down 4639.0% YoY), while the FY2025 annual figure was 21.54%, down 2668.0% from the prior year.
• Tax Rate was 0.0% for Q1 2026 at Prothena Corp Public, up from 0.05% in the prior quarter.
• In the past five years, Tax Rate ranged from a high of 7.3% in Q2 2023 to a low of 89.81% in Q4 2022.
• Historically, Tax Rate has averaged 7.31% across 5 years, with a median of 1.92% in 2025.
• The sharpest annual moves came in 2022 and 2023: Tax Rate plunged 8955 bps in 2022, then jumped 9427 bps in 2023.
• A 5-year view of Tax Rate shows it stood at 89.81% in 2022, then soared by 105 bps to 4.46% in 2023, then tumbled by 43 bps to 2.55% in 2024, then plunged by 102 bps to 0.05% in 2025, then jumped by 107 bps to 0.0% in 2026.
• The last three Tax Rate figures came in at 0.0% (Q1 2026), 0.05% (Q4 2025), and 1.08% (Q3 2025), per Business Quant data.