Spero Therapeutics Inc. (SPRO)
Showing Closing Date Range from May 3 to Oct 30, 2026 compared to Nov 3, 2025 to May 2, 2026.
Compare Last 6 Months with Previous Period
Investor Relations:investors.sperotherapeutics.com
Current Period Close
$1.06
May 03, 2026 - Oct 30, 2026
Previous Period Close
$2.48
Nov 03, 2025 - May 02, 2026
Net Comparison Delta
$-1.42 (-57.26%)
Relative performance vs prior benchmark
Historical Quotes & Breakdown(122 dates)
| Current Date | Current Close | Previous Date | Previous Close | Delta (%) |
|---|---|---|---|---|
| Oct 30, 2026 | $1.06 | Apr 29, 2026 | $2.53 | -58.10% |
| Oct 29, 2026 | $1.11 | Apr 28, 2026 | $2.67 | -58.43% |
| Oct 28, 2026 | $1.17 | Apr 27, 2026 | $2.67 | -56.18% |
| Oct 27, 2026 | $1.14 | Apr 24, 2026 | $2.74 | -58.39% |
| Oct 26, 2026 | $1.07 | Apr 23, 2026 | $2.80 | -61.79% |
| Oct 23, 2026 | $1.11 | Apr 22, 2026 | $2.86 | -61.19% |
| Oct 22, 2026 | $1.13 | Apr 21, 2026 | $2.80 | -59.64% |
| Oct 21, 2026 | $1.17 | Apr 20, 2026 | $2.84 | -58.80% |
| Oct 20, 2026 | $1.22 | Apr 17, 2026 | $2.75 | -55.64% |
| Oct 19, 2026 | $1.12 | Apr 16, 2026 | $2.68 | -58.21% |
| Oct 16, 2026 | $1.10 | Apr 15, 2026 | $2.64 | -58.33% |
| Oct 15, 2026 | $1.13 | Apr 14, 2026 | $2.78 | -59.35% |
| Oct 14, 2026 | $1.12 | Apr 13, 2026 | $2.78 | -59.71% |
| Oct 13, 2026 | $1.15 | Apr 10, 2026 | $2.67 | -56.93% |
| Oct 12, 2026 | $1.18 | Apr 09, 2026 | $2.78 | -57.55% |
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