---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-216310"
form_type: "8-K"
ticker: "SPRO"
cik: "0001701108"
company_name: "Spero Therapeutics, Inc."
filed_at: "2024-09-10T23:59:59+00:00"
generated_at: "2026-05-31T05:39:57.997406+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.05
calibrated_materiality_score: 0.05
confidence: "low"
source: SEC EDGAR
---

# Spero Therapeutics updates investor presentation; no material new financial or operational data disclosed

## Summary
- Filed an updated investor presentation dated September 9, 2024, under Regulation FD.
- Presentation available on Spero's IR website; company disclaims obligation to update after that date.
- No specific financial metrics, pipeline updates, or guidance changes were provided in the filing.

## SEC filing metadata
- accession: 0001193125-24-216310
- form_type: 8-K
- ticker: SPRO
- cik: 0001701108
- company_name: Spero Therapeutics, Inc.
- filed_at: 2024-09-10T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.05
- calibrated_materiality_score: 0.05
- confidence: low
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1701108/000119312524216310/0001193125-24-216310-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1701108/000119312524216310/d819424d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-216310
- JSON: https://secwatch.observer/filing/0001193125-24-216310.json
- Plain text: https://secwatch.observer/filing/0001193125-24-216310.txt

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