Aspen Aerogels (ASPN) SVP awarded stock, options as shares withheld for taxes

Rhea-AI Filing Summary

Aspen Aerogels SVP Corby C. Whitaker reported equity compensation changes and related tax withholding. On March 4, 2026, he acquired 57,462 shares of Common Stock as a grant and 77,824 stock options, both at a stated price of $0.0000 per share.

The options vest in three equal annual installments on March 4, 2027, March 4, 2028, and March 4, 2029. Related RSUs follow the same vesting schedule. On March 5, 2026, 3,907 shares of Common Stock were disposed of at $3.27 per share to cover minimum statutory tax withholding on RSU vesting, leaving 207,239 Common shares held directly.

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

OMB APPROVAL

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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^*

Whitaker Corby C

(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, Sales and Marketing

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	211,146	D
Common Stock	03/05/2026		F		3,907(2)	D	$3.27	207,239(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 124,588 shares of Common Stock and 82,651 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).
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FAQ

What insider transactions did ASPN executive Corby C. Whitaker report?

Corby C. Whitaker reported equity awards and a tax-related share withholding. He received grants of Common Stock and stock options on March 4, 2026, then had 3,907 shares withheld on March 5, 2026 to satisfy minimum statutory tax obligations tied to Restricted Stock Unit vesting.

How many Aspen Aerogels (ASPN) shares and options were granted to Corby C. Whitaker?

Whitaker was granted 57,462 shares of Common Stock and 77,824 stock options on March 4, 2026. These awards were recorded at a stated price of $0.0000 per share, reflecting typical accounting treatment for equity compensation rather than a market purchase transaction.

What is the vesting schedule for Corby C. Whitaker’s ASPN RSUs and options?

Whitaker’s RSUs and stock options vest in three equal parts over three years. One-third vests on March 4, 2027, another third on March 4, 2028, and the final third on March 4, 2029, creating a multi-year retention and performance alignment structure.

Why were 3,907 ASPN shares disposed of in Corby C. Whitaker’s Form 4?

The 3,907 Common Stock shares were withheld to cover tax obligations. Specifically, Aspen Aerogels retained these shares to satisfy minimum statutory tax withholding requirements triggered by the vesting of Whitaker’s Restricted Stock Units, rather than representing an open-market sale by him.

How many Aspen Aerogels (ASPN) shares does Corby C. Whitaker hold after these transactions?

Following the tax-withholding disposition, Whitaker directly holds 207,239 shares of Aspen Aerogels Common Stock. A related footnote indicates this amount reflects a combination of 124,588 current shares and 82,651 Restricted Stock Units that settle into shares upon vesting.

Are Corby C. Whitaker’s ASPN transactions open-market buys or sales?

The reported activities are equity awards and tax withholding, not open-market trades. Whitaker received stock and option grants at a stated price of $0.0000 per share, and shares were withheld by Aspen Aerogels solely to satisfy minimum statutory taxes on Restricted Stock Unit vesting.