Aspen Aerogels Posts Investor Presentation (Regulation FD Disclosure)

What Happened

• Aspen Aerogels, Inc. announced on September 15, 2026 that it posted an updated investor presentation on the investor relations section of its website. The presentation may be used, in whole or in part, in presentations and discussions with investors, analysts and other interested parties and is furnished as Exhibit 99.1 to the Form 8‑K.

Key Details

• Date posted: September 15, 2026.
• Document furnished: Investor Presentation, included as Exhibit 99.1 to the 8‑K.
• Purpose: May be used in presentations to investors, analysts and other interested parties.
• Legal note: The presentation is furnished (not “filed”), and website hyperlinks are not incorporated by reference; the furnishing is not subject to Section 18 liability under the Exchange Act.

Why It Matters

• This lets investors know Aspen Aerogels has distributed updated investor materials that may contain company strategy, operational or financial highlights outside of formal SEC filings. Because the presentation is furnished rather than filed, it is available for investor review but carries different legal implications than filed disclosures. Investors should review Exhibit 99.1 on the company’s investor relations site for any substantive updates.