# EDGAR Filing Document

**Accession Number:** 0001145986
**File Stem:** 0001193125-26-129482
**Filing Date:** 2026-3
**Character Count:** 1191
**Document Hash:** 9c590be866224f274d64f6a7de33bfce
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-129482.hdr.sgml**: 20260327

**ACCESSION NUMBER**: 0001193125-26-129482

**CONFORMED SUBMISSION TYPE**: ARS

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260327

**DATE AS OF CHANGE**: 20260327

**EFFECTIVENESS DATE**: 20260327

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ASPEN AEROGELS INC
- **CENTRAL INDEX KEY:** 0001145986
- **STANDARD INDUSTRIAL CLASSIFICATION:** WHOLESALE-LUMBER & OTHER CONSTRUCTION MATERIALS [5030]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 043559972
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** ARS
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36481
- **FILM NUMBER:** 26808695

**BUSINESS ADDRESS:**
- **STREET 1:** 30 FORBES ROAD
- **STREET 2:** BUILDING B
- **CITY:** NORTHBOROUGH
- **STATE:** MA
- **ZIP:** 01532
- **BUSINESS PHONE:** 5086911111

**MAIL ADDRESS:**
- **STREET 1:** 30 FORBES ROAD
- **STREET 2:** BUILDING B
- **CITY:** NORTHBOROUGH
- **STATE:** MA
- **ZIP:** 01532

### Attached PDF Documents

**Attachment 1:** `aspn_ars_2025.pdf`

_No text found in this document._