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

Spero Therapeutics (SPRO) has reported Tax Rate for 3 consecutive years, with 5.84% the latest figure, recorded in Q4 2025.

• For the quarter ending Q4 2025, Tax Rate rose 443.0% year-over-year to 5.84%; the trailing twelve-month figure through Dec 2025 stood at 21.01% (up 2480.0% YoY), and the FY2025 full-year result was 21.0%, changed N/A from the prior year.
• Tax Rate advanced to 5.84% in Q4 2025 per SPRO's latest filing, from 1.41% in the prior quarter.
• Across five years, Tax Rate topped out at 5.84% in Q4 2025 and bottomed at 222.43% in Q3 2023.
• Historically, Tax Rate has averaged 43.22% across 3 years, with a median of 0.75% in 2023.
• The widest YoY moves for Tax Rate: up 22077 bps in 2024, down 66 bps in 2024.
• Over 3 years, Tax Rate stood at 0.75% in 2023, then jumped by 88 bps to 1.41% in 2024, then soared by 315 bps to 5.84% in 2025.
• According to Business Quant data, Tax Rate over the past three periods registered 5.84%, 1.41%, and 1.66% for Q4 2025, Q4 2024, and Q3 2024 respectively.