---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-042785"
form_type: "8-K"
ticker: "SPRO"
cik: "0001701108"
company_name: "Spero Therapeutics, Inc."
filed_at: "2025-02-28T23:59:59+00:00"
generated_at: "2026-05-25T23:38:21.163351+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Spero Therapeutics receives Nasdaq bid price deficiency notice; has until Aug 25, 2025 to regain compliance

## Summary
- Nasdaq notified Spero on Feb 25, 2025 that its stock closed below $1.00 for 30 consecutive trading days.
- Compliance deadline is August 25, 2025; cure requires closing at $1.00+ for 10 consecutive business days.
- If not cured, Spero may transfer to Nasdaq Capital Market and consider reverse stock split for 180-day extension.
- Stock continues trading on Nasdaq GS under SPRO; no immediate delisting effect.

## SEC filing metadata
- accession: 0001193125-25-042785
- form_type: 8-K
- ticker: SPRO
- cik: 0001701108
- company_name: Spero Therapeutics, Inc.
- filed_at: 2025-02-28T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 3.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1701108/000119312525042785/0001193125-25-042785-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1701108/000119312525042785/d924647d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-042785
- JSON: https://secwatch.observer/filing/0001193125-25-042785.json
- Plain text: https://secwatch.observer/filing/0001193125-25-042785.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.