Santhosh P. Daniel - 13 Sep 2025 Form 4 Insider Report for ASPEN AEROGELS INC (ASPN)

Role
Chief Accounting Officer
Signature
/s/ Stephanie Pittman, Attorney-in-Fact
Issuer symbol
ASPN
Transactions as of
13 Sep 2025
Net transactions value
-$10,300
Form type
4
Filing time
15 Sep 2025, 17:00:07 UTC
Previous filing
13 Aug 2025
Next filing
06 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Daniel Santhosh P Chief Accounting Officer C/O ASPEN AEROGELS, INC.,, 30 FORBES ROAD, BLDG B, NORTHBOROUGH /s/ Stephanie Pittman, Attorney-in-Fact 15 Sep 2025 0001935618

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ASPN Common Stock Tax liability $10,300 -1,563 -8.7% $6.59 16,316 13 Sep 2025 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 1. Shares withheld by Registrant to satisfy minimum statutory tax withholding requirements on vesting of Restricted Stock Units ("RSUs").
F2 2. Represents 3,761 shares of Common Stock and 12,555 RSUs.