Grant Douglas Thoele - Oct 1, 2025 Form 3 Insider Report for ASPEN AEROGELS INC (ASPN)

Role
CFO & Treasurer
Signature
/s/ Glenn Deegan, Attorney-in-Fact
Stock symbol
ASPN
Transactions as of
Oct 1, 2025
Transactions value $
$0
Form type
3
Date filed
10/2/2025, 05:36 PM
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Thoele Grant Douglas CFO & Treasurer 30 FORBES ROAD, BUILDING B, NORTHBOROUGH /s/ Glenn Deegan, Attorney-in-Fact 2025-10-02 0002089743

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding ASPN Common Stock 4.61K Oct 1, 2025 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding ASPN Stock Options (Right to Buy) Oct 1, 2025 Common Stock 1K $52.60 Direct F1
holding ASPN Stock Options (Right to Buy) Oct 1, 2025 Common Stock 1.33K $26.29 Direct F2
holding ASPN Stock Options (Right to Buy) Oct 1, 2025 Common Stock 2.99K $26.29 Direct F2
holding ASPN Stock Options (Right to Buy) Oct 1, 2025 Common Stock 7.77K $9.88 Direct F3
holding ASPN Stock Options (Right to Buy) Oct 1, 2025 Common Stock 5.37K $16.34 Direct F4
holding ASPN Stock Options (Right to Buy) Oct 1, 2025 Common Stock 8.99K $7.84 Direct F5
holding ASPN Performance Share Units Oct 1, 2025 Common Stock 12.8K Direct F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 These options to purchase shares of our common stock were granted on November 2, 2021 and vested as to one-third of the shares on each anniversary of the grant date until November 2, 2024.
F2 These options to purchase shares of our common stock were granted on February 23, 2022 and vested as to one-third of the shares on each anniversary of the grant date until February 23, 2025.
F3 These options to purchase shares of our common stock were granted on March 8, 2023 and vested as to one-third of the shares on each anniversary of the grant date until March 8, 2026.
F4 These options to purchase shares of our common stock were granted on March 5, 2024 and vested as to one-third of the shares on each anniversary of the grant date until March 5, 2027.
F5 These options to purchase shares of our common stock were granted on March 5, 2025 and vested as to one-third of the shares on each anniversary of the grant date until March 5, 2028.
F6 Each performance share unit ("PSU") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index.

Remarks:

Exhibit 24.1 - Power of Attorney