Aspen Aerogels (ASPN) CFO awarded RSUs, options and withholds shares for taxes

Rhea-AI Filing Summary

Aspen Aerogels CFO & Treasurer Grant Douglas Thoele reported new equity awards and a small tax-related share disposition. On March 4, 2026, he received 55,298 shares of Common Stock as a grant and 74,893 stock options with a right to buy additional shares at an exercise price of $0.0000 per share. The options and related Restricted Stock Units (RSUs) vest in three equal annual installments on March 4, 2027, March 4, 2028, and March 4, 2029. On March 5, 2026, 2,368 shares of Common Stock were disposed of at $3.27 per share to satisfy minimum statutory tax withholding on RSU vesting. After these transactions, he directly owned 78,322 shares of Common Stock, which the footnotes state includes 9,014 shares and 69,308 RSUs.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Thoele Grant Douglas

(Last) (First) (Middle)

30 FORBES ROAD, BUILDING B

(Street)

NORTHBOROUGH MA 01532

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ASPEN AEROGELS INC [ ASPN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CFO & Treasurer

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/04/2026		A		55,298(1)	A	$0	80,690	D
Common Stock	03/05/2026		F		2,368(2)	D	$3.27	78,322(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Options (Right to Buy)	$3.35	03/04/2026		A		74,893		(4)	03/04/2036	Common Stock	74,893	$0	74,893	D

Explanation of Responses:

1. Each Restricted Stock Unit ("RSU") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029.

2. Shares withheld by Registrant to satisfy the minimum statutory tax withholding requirements on vesting of Restricted Stock Units ("RSUs").

3. Represents 9,014 shares of Common Stock and 69,308 RSUs.

4. The options vest as to one-third of the shares on March 4, 2027, an additional one-third of the shares on March 4, 2028 and the remaining one-third of the shares on March 4, 2029.

	/s/ Glenn Deegan, Attorney-in-Fact	03/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did Aspen Aerogels (ASPN) CFO Grant Douglas Thoele report?

He reported equity grants and a tax-related share disposition. On March 4, 2026, he received 55,298 Common Stock shares and 74,893 stock options. On March 5, 2026, 2,368 shares were disposed to cover minimum statutory tax withholding on vested RSUs.

How many Aspen Aerogels (ASPN) stock options were granted to the CFO?

Grant Douglas Thoele was granted 74,893 stock options on March 4, 2026. Each option is a right to buy Common Stock, with vesting scheduled in three equal annual installments in 2027, 2028, and 2029, subject to the described vesting terms.

What is the vesting schedule for the Aspen Aerogels (ASPN) RSUs reported?

Each Restricted Stock Unit represents one share of Common Stock upon vesting. The RSUs vest one‑third on March 4, 2027, another one‑third on March 4, 2028, and the final one‑third on March 4, 2029, as outlined in the footnotes.

Why were 2,368 Aspen Aerogels (ASPN) shares disposed by the CFO?

The 2,368 shares of Common Stock were withheld by the company to satisfy minimum statutory tax withholding on RSU vesting. This tax-withholding disposition is reported at a price of $3.27 per share, according to the transaction details and footnote explanation.

What is Grant Douglas Thoele’s Aspen Aerogels (ASPN) equity position after these transactions?

Following the reported transactions, he directly held 78,322 Common Stock shares. A related footnote clarifies this represents 9,014 actual Common Stock shares and 69,308 Restricted Stock Units, reflecting both current holdings and unvested equity awards together.

When do the Aspen Aerogels (ASPN) stock options granted to the CFO vest?

The stock options vest in three equal parts. One‑third of the options vest on March 4, 2027, another one‑third on March 4, 2028, and the remaining one‑third on March 4, 2029, matching the schedule described for these option awards.