---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-338438"
form_type: "8-K"
ticker: "SLDB"
cik: "0001707502"
company_name: "Solid Biosciences Inc."
filed_at: "2026-08-06T21:15:48+00:00"
generated_at: "2026-08-06T21:18:10.798274+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Solid Biosciences upsizes ATM equity facility to $200M; $85M already sold

## Summary
- Filed prospectus supplement for up to $200M in common stock sales under existing ATM agreement with Jefferies.
- Prior supplement for $85M exhausted; $85M in gross proceeds already raised.
- New supplement replaces prior; no further sales under old supplement.
- Legal opinion from WilmerHale attached as Exhibit 5.1.
- Shares registered under existing shelf registration statement (S-3).

## SEC filing metadata
- accession: 0001193125-26-338438
- form_type: 8-K
- ticker: SLDB
- cik: 0001707502
- company_name: Solid Biosciences Inc.
- filed_at: 2026-08-06T21:15:48+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1707502/000119312526338438/0001193125-26-338438-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1707502/000119312526338438/d177624d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-338438
- JSON: https://secwatch.observer/filing/0001193125-26-338438.json
- Plain text: https://secwatch.observer/filing/0001193125-26-338438.txt

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