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

Spero Therapeutics (SPRO) has 3 years of Tax Rate data on file, last reported 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.
• Across five years, Tax Rate topped out at 1.19% in Q4 2024 and bottomed at 224.7% in Q3 2023.
• The 3-year median for Tax Rate is 0.7% (2023), against an average of 44.73%.
• The widest annual swing landed in 2024, when Tax Rate jumped 22303 bps; it then sank 37 bps in 2025.
• A 3-year view of Tax Rate shows it stood at 0.7% in 2023, then surged by 71 bps to 1.19% in 2024, then tumbled 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.

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