Santhosh P. Daniel - 05 Mar 2026 Form 4 Insider Report for ASPEN AEROGELS INC (ASPN)

Role
Chief Accounting Officer
Signature
/s/ Glenn Deegan, Attorney-in-Fact
Issuer symbol
ASPN
Transactions as of
05 Mar 2026
Net transactions value
$0
Form type
4
Filing time
06 Mar 2026, 17:00:06 UTC
Previous filing
15 Sep 2025
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/ Glenn Deegan, Attorney-in-Fact 06 Mar 2026 0001935618

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ASPN Common Stock Tax liability -986 -6% $3.27* 15,330 05 Mar 2026 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units ("RSUs").
F2 Represents 5,593 shares of Common Stock and 9,737 RSUs.

Remarks:

Exhibit 24.1 - Power of Attorney