Aspen Aerogels (NYSE: ASPN) SVP awarded RSUs, options and tax withholding shares

Rhea-AI Filing Summary

Aspen Aerogels senior vice president Gregg Landes reported equity compensation awards and related tax withholding transactions. On March 4, 2026, he received 57,462 restricted stock units and 77,824 stock options that each vest in three equal annual installments on March 4, 2027, 2028 and 2029. On March 5, 3,814 shares of common stock at $3.27 per share were withheld to cover minimum statutory taxes on RSU vesting. After these movements, he directly holds 22,735 shares of common stock, 82,120 RSUs and 77,824 stock options.

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^*

Landes Gregg

(Last) (First) (Middle)

C/O ASPEN AEROGELS, INC.,

30 FORBES ROAD, BLDG 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)
	SVP, Operations and Strat Deve

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		57,462(1)	A	$0	108,669	D
Common Stock	03/05/2026		F		3,814(2)	D	$3.27	104,855(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		77,824		(4)	03/04/2036	Common Stock	77,824	$0	77,824	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 22,735 shares of Common Stock and 82,120 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.

Remarks:

Exhibit 24.1 - Power of Attorney

	/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.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What insider transactions did ASPN executive Gregg Landes report on this Form 4?

Gregg Landes reported equity awards and tax withholding transactions. He received 57,462 restricted stock units, 77,824 stock options vesting over three years, and had 3,814 common shares withheld at $3.27 each to satisfy minimum statutory tax obligations tied to RSU vesting.

How many restricted stock units did ASPN grant to Gregg Landes and how do they vest?

Aspen Aerogels granted Gregg Landes 57,462 restricted stock units. These RSUs vest in three equal installments: one-third on March 4, 2027, another third on March 4, 2028, and the final third on March 4, 2029, each converting into one share of common stock.

What stock option award did ASPN grant to Gregg Landes according to the Form 4?

The Form 4 shows a grant of 77,824 stock options to Gregg Landes. These options vest over three years, with one-third becoming exercisable on March 4, 2027, an additional third on March 4, 2028, and the remaining third on March 4, 2029, subject to continued service.

Why were 3,814 ASPN shares disposed of in Gregg Landes’ Form 4 filing?

The 3,814 shares of Aspen Aerogels common stock were withheld by the company to cover minimum statutory tax withholding requirements. This occurred in connection with the vesting of restricted stock units and is reported as a tax-withholding disposition at a price of $3.27 per share.

What are Gregg Landes’ ASPN share and RSU holdings after these transactions?

After the reported transactions, Gregg Landes directly holds 22,735 shares of Aspen Aerogels common stock and 82,120 restricted stock units. He also holds 77,824 stock options, providing additional potential future ownership if vesting and any exercise conditions are satisfied over time.

What role does Gregg Landes hold at Aspen Aerogels (ASPN)?

Gregg Landes serves as a senior vice president at Aspen Aerogels, with the title "SVP, Operations and Strat Deve." His responsibilities include operations and strategic development, and the reported equity awards align his compensation more closely with long-term shareholder value through stock, RSUs, and options.