Aspen Aerogels (NYSE: ASPN) COO reports routine tax share withholding

Rhea-AI Filing Summary

ASPEN AEROGELS INC Chief Operating Officer Gregg Landes reported a routine tax-related share disposition. The company withheld 1,924 shares of common stock at $3.22 per share to cover minimum statutory taxes on vesting of restricted stock units. After this withholding, Landes holds 102,931 equity-linked units, including 26,317 shares of common stock and 76,614 restricted stock units.

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)
	Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/08/2026

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	03/08/2026		F		1,924(1)	D	$3.22	102,931(2)	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

Explanation of Responses:

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

2. Represents 26,317 shares of Common Stock and 76,614 RSUs.

	/s/ Glenn Deegan, Attorney-in-Fact	03/10/2026
	** 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 did ASPN executive Gregg Landes report in this Form 4 filing?

Gregg Landes reported a tax-withholding disposition of 1,924 Aspen Aerogels shares. The company withheld these shares at $3.22 each to satisfy minimum statutory taxes on vested restricted stock units, rather than Landes selling them in the open market.

Was the ASPN Form 4 transaction an open-market sale of shares?

No, the Form 4 for ASPN shows a tax-withholding disposition, not an open-market sale. Shares were withheld by the company to cover tax obligations triggered by restricted stock unit vesting, which is a standard, non-discretionary compensation-related mechanism.

How many ASPN shares were withheld for taxes in this transaction?

A total of 1,924 Aspen Aerogels common shares were withheld. They were valued at $3.22 per share for tax purposes, satisfying minimum statutory withholding requirements that arise when restricted stock units vest and become taxable to the executive.

What are Gregg Landes’ holdings in ASPN after the reported transaction?

Following the tax withholding, Gregg Landes is shown holding 102,931 equity-linked units in Aspen Aerogels. Footnotes specify this consists of 26,317 shares of common stock and 76,614 restricted stock units that may convert into additional shares as they vest.

Does this ASPN Form 4 indicate any new option exercises or derivative trades?

No new option exercises or derivative trades are reported in this Form 4. The filing only shows a non-derivative tax-withholding event related to restricted stock unit vesting, with no derivative positions listed in the derivative transaction or position summary.

Is the ASPN Form 4 transaction likely to be market-moving for investors?

This Form 4 describes a routine tax-withholding event tied to equity compensation, not a discretionary purchase or sale. Such transactions typically have limited signaling value, as they are driven by tax rules rather than the insider’s view of Aspen Aerogels’ share price.