Spero Therapeutics (SPRO) Tax Rate (2023 - 2025)

Spero Therapeutics has reported Tax Rate for 3 years, with the latest figure at 0.82% in Q4 2025.

• For the quarter ending Q4 2025, Tax Rate fell 37.0% year-over-year to 0.82%; the trailing twelve-month figure through Dec 2025 stood at 2.96% (up 655.0% YoY), and the FY2025 full-year result was 2.96%, changed N/A from the prior year.
• Tax Rate for Q4 2025 stood at 0.82%, down from 1.19% in the prior quarter.
• The five-year high for Tax Rate was 1.19% in Q4 2024, with the low at 224.7% in Q3 2023.
• Historically, Tax Rate has averaged 44.73% across 3 years, with a median of 0.7% in 2023.
• Annual changes were most pronounced in 2024 — Tax Rate jumped 22303 bps — and 2025, when it tumbled 37 bps.
• Spero Therapeutics' Tax Rate stood at 0.7% in 2023, then jumped by 71 bps to 1.19% in 2024, then plunged by 31 bps to 0.82% in 2025.
• The last three Tax Rate figures came in at 0.82% (Q4 2025), 1.19% (Q4 2024), and 1.67% (Q3 2024), per Business Quant data.