As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

  6/5/23  Johnson Virginia                  4          Officer²    1:7K   Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Young Donald R                    4          Dir.,Off.²  2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Sweetnam James E                  4          Director²   2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Noglows William P                 4          Director²   2:11K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Noetzel Mark L                    4          Director²   2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Mitchell Steven R                 4          Director²   2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Kool Kathleen                     4          Director²   2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Blalock Rebecca                   4          Director²   2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Whitaker Corby C                  4          Officer²    2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Schilling Keith L                 4          Officer²    2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Rodriguez Ricardo C.              4          Officer²    2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Landes Gregg                      4          Officer²    2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/2/23  Conte Kelley                      4          Officer²    2:10K  Aspen Aerogels Inc.               DONNELLEY FIN… File16/FA 
  6/1/23  Aspen Aerogels Inc.               S-8          6/1/23    4:101K                                   Donnelley … Solutions/FA 
  6/1/23  Aspen Aerogels Inc.               8-K:5,9      6/1/23   16:835K                                   Donnelley … Solutions/FA 

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¹	Filing/Form Types:
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	8-K	Current Report — Form 8-K { Item 1: Business & Operations;  2: Financial Info;  3: Securities & Trading;  4: Accountants & Accounting;  5: Governance & Management;  6: Asset-Backed Securities;  7: Disclosures;  8: Events;  9: Financials }.
	S-8	Registration Statement – Securities for an Employee Benefit Plan — Form S-8.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.