1 unchanged sentence
(c) 10b5-1 Trading Plans
−Removed: None of our directors or executive officers adopted , modified or terminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement” as such term is defined in Item 408(a) of Regulation S-K, during the fiscal quarter ended March 31, 2026.
+Added: None of our directors or executive officers adopted , modified or terminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement” as such term is defined in Item 408(a) of Regulation S-K, during the fiscal quarter ended June 30, 2026.
+Added: Form of Restricted Share Unit Agreement for Directors under the 2023 Equity Incentive Plan
Certification of principal executive officer under Section 302(a) of the Sarbanes-Oxley Act of 2002.
4 unchanged sentences
Cover Page Interactive Data File (embedded within the Inline XBRL document).
+Added: + Management contract or compensation plan or arrangement.
* The certifications attached as Exhibit 32 that accompany this Quarterly Report on Form 10-Q are not deemed filed with the Securities and Exchange Commission and are not to be incorporated by reference into any filing of Aspen Aerogels, Inc.
2 unchanged sentences
ASPEN AEROGELS, INC.
+Added: August 7, 2026
/s/ Donald R.
1 unchanged sentence
(principal executive officer)
+Added: August 7, 2026
/s/ Grant Thoele
2 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.