---
schema_version: "secwatch.filing_event.v1"
accession: "0001171843-26-002620"
form_type: "8-K"
ticker: "ASPN"
cik: "0001145986"
company_name: "ASPEN AEROGELS INC"
filed_at: "2026-04-21T23:59:59+00:00"
generated_at: "2026-05-15T05:03:36.661423+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Aspen Aerogels: East Providence facility remains offline after April 8 explosion

## Summary
- Explosion damaged production space, origin traced to high-temperature oven.
- Eleven employees transported to medical facilities and subsequently released.
- Facility remains offline as of April 21; company working with authorities on restart plan.
- Business interruption and property damage insurance claims process initiated.
- Further update expected with fiscal Q1 2026 earnings release in early May.

## SEC filing metadata
- accession: 0001171843-26-002620
- form_type: 8-K
- ticker: ASPN
- cik: 0001145986
- company_name: ASPEN AEROGELS INC
- filed_at: 2026-04-21T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1145986/000117184326002620/0001171843-26-002620-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1145986/000117184326002620/f8k_042126.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001171843-26-002620
- JSON: https://secwatch.observer/filing/0001171843-26-002620.json
- Plain text: https://secwatch.observer/filing/0001171843-26-002620.txt

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