Aspen Aerogels (ASPN) director granted RSUs and stock options as annual equity

Rhea-AI Filing Summary

ASPEN AEROGELS INC director equity grant: Non-employee director Kathleen Kool received 10,370 Restricted Stock Units (RSUs) and options for 8,706 shares of Common Stock as part of her annual equity compensation. The RSUs and options will vest on the earlier of May 13, 2027 or the day before the company’s 2027 annual stockholders meeting. Following the RSU grant, she holds 34,323 shares of Common Stock in total, including 23,953 actual shares and 10,370 RSUs, and 8,706 stock options with a $5.40 exercise price expiring in 2036.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Kool Kathleen

Role null

Type	Security	Shares	Price	Value
Grant/Award	Stock Options (Right to Buy)	8,706	$0.00	--
Grant/Award	Common Stock	10,370	$0.00	--

Holdings After Transaction: Stock Options (Right to Buy) — 8,706 shares (Direct, null); Common Stock — 34,323 shares (Direct, null)

Footnotes (1)

1. The reporting person was granted Restricted Stock Units ("RSUs") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027. Represents 23,953 shares of Common Stock and 10,370 RSUs. The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027.

Key Figures

RSUs granted: 10,370 RSUs Options granted: 8,706 options Option exercise price: $5.40 per share +5 more

8 metrics

RSUs granted 10,370 RSUs Annual equity grant for non-employee director on May 13, 2026

Options granted 8,706 options Stock options granted to director on May 13, 2026

Option exercise price $5.40 per share Exercise price for 8,706 stock options

Options expiration May 13, 2036 Expiration date of granted stock options

Total common shares after grant 34,323 shares Includes 23,953 shares and 10,370 RSUs after RSU grant

Common shares held 23,953 shares Actual Common Stock held, excluding RSUs, after grant

RSUs component of holdings 10,370 RSUs Part of 34,323 total Common Stock-related holdings

Vesting date Earlier of May 13, 2027 or day before 2027 meeting Vesting trigger for RSUs and options

Key Terms

Restricted Stock Units ("RSUs"), Non-Employee Director Compensation Policy, Common Stock, stock options, +1 more

5 terms

Restricted Stock Units ("RSUs") financial

"The reporting person was granted Restricted Stock Units ("RSUs") representing a portion of the annual grant of equity..."

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

Non-Employee Director Compensation Policy financial

"…annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy."

Common Stock financial

"Each RSU represents the right to receive one share of Common Stock upon vesting."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

stock options financial

"The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director…"

Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.

annual meeting of stockholders financial

"…the day prior to the Issuer's annual meeting of stockholders to be held in 2027."

Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Kool Kathleen

(Last) (First) (Middle)

C/O ASPEN AEROGELS, INC.,

30 FORBES ROAD, BLDG B

(Street)

NORTHBOROUGH MASSACHUSETTS 01532

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/13/2026

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

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

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

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	05/13/2026		A		10,370(1)	A	$0	34,323(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
Stock Options (Right to Buy)	$5.4	05/13/2026		A		8,706		(3)	05/13/2036	Common Stock	8,706	$0	8,706	D

Explanation of Responses:

1. The reporting person was granted Restricted Stock Units ("RSUs") representing a portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027.

2. Represents 23,953 shares of Common Stock and 10,370 RSUs.

3. The reporting person was granted options representing the remaining portion of the annual grant of equity for service as a non-employee director pursuant to the Issuer's Non-Employee Director Compensation Policy. The options will vest on the earlier of (a) May 13, 2027, or (b) the day prior to the Issuer's annual meeting of stockholders to be held in 2027.

Remarks:

Exhibit 24.1 - Power of Attorney

	/s/ Glenn Deegan, Attorney-in-Fact	05/14/2026
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did ASPN director Kathleen Kool report on this Form 4?

Kathleen Kool reported equity compensation grants, not market trades. She received 10,370 RSUs and 8,706 stock options for service as a non-employee director, all under Aspen Aerogels’ Non-Employee Director Compensation Policy, with no cash purchase or open-market sale involved.

How many Aspen Aerogels (ASPN) RSUs were granted to director Kathleen Kool?

She was granted 10,370 Restricted Stock Units. Each RSU represents the right to receive one share of Aspen Aerogels Common Stock upon vesting, forming part of her annual equity award for serving as a non-employee director under the company’s director compensation policy.

What stock options did Kathleen Kool receive from Aspen Aerogels (ASPN)?

She received options for 8,706 shares of Common Stock. These options have a $5.40 exercise price and will vest on the earlier of May 13, 2027 or the day before Aspen Aerogels’ 2027 annual stockholders meeting, with an expiration date in 2036.

When do Kathleen Kool’s new ASPN RSUs and options vest?

Both the RSUs and options vest on the earlier of May 13, 2027, or the day prior to Aspen Aerogels’ annual meeting of stockholders to be held in 2027. This aligns the vesting schedule with the board’s annual service cycle for non-employee directors.

What are Kathleen Kool’s Aspen Aerogels (ASPN) share holdings after this Form 4?

After the RSU grant, she holds 34,323 shares of Common Stock in total. This consists of 23,953 actual shares plus 10,370 RSUs, as disclosed in the footnotes, in addition to 8,706 stock options granted on the same date.

Was the Aspen Aerogels (ASPN) Form 4 a stock purchase or sale by Kathleen Kool?

No, it reflects compensation, not a purchase or sale. The Form 4 reports grants of RSUs and stock options awarded under Aspen Aerogels’ Non-Employee Director Compensation Policy, with no open-market buying or selling of shares by the director.