[Form 3] ASPEN AEROGELS INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Glenn E. Deegan, serving as CAO, General Counsel and Corporate Secretary of Aspen Aerogels, Inc. (ASPN), filed an initial Form 3 dated 09/22/2025 reporting that he does not beneficially own any securities of the issuer. The filing identifies Deegan's address at 30 Forbes Road, Northborough, MA, and was executed on his behalf by Andrew Lauzon, Attorney-in-Fact.

Insights

Corporate Governance Expert

TL;DR: Routine initial Section 16 filing showing no personal equity stake by a senior officer; no immediate governance implications.

This Form 3 is an administrative disclosure required when an officer becomes subject to Section 16 reporting. Reporting no beneficial ownership means there are no insider holdings to track for short-swing profit rules or required future transaction reporting until holdings change. This is a standard, low-impact disclosure.

Securities Analyst

TL;DR: Administrative filing with neutral investor impact; absence of holdings yields no change to insider ownership metrics.

The submission does not report equity or derivative positions, so insider ownership percentages and potential insider selling/buying signals remain unchanged. Investors and compliance teams should note the filing date (09/22/2025) and await any subsequent Forms 4 or 5 if holdings or transactions occur.

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

DEEGAN GLENN E.

(Last) (First) (Middle)

C/O ASPEN AEROGELS, INC.

30 FORBES ROAD, BLDG B

(Street)

NORTHBOROUGH MA 01532

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/22/2025

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CAO, GC & Corp Secretary

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24.1 - Power of Attorney No securities are beneficially owned

No securities are beneficially owned.

	/s/ Andrew Lauzon, Attorney-in-Fact	09/22/2025
	** 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 5 (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.

FAQ

What did Glenn E. Deegan report on Form 3 for Aspen Aerogels (ASPN)?

The filing states no securities are beneficially owned by Glenn E. Deegan as of the 09/22/2025 report date.

What is Glenn E. Deegan's role at Aspen Aerogels according to the filing?

He is identified as CAO, General Counsel & Corporate Secretary of Aspen Aerogels, Inc.

When was the Form 3 filed and who signed it?

The Form 3 is dated 09/22/2025 and is signed on behalf of the reporting person by Andrew Lauzon, Attorney-in-Fact.

Does this Form 3 indicate any derivative or option positions?

No. The filing explicitly states no securities are beneficially owned, and no derivative or option positions are reported.

Should investors expect immediate material impact from this filing for ASPN?

No. This is a routine initial disclosure and the filing itself has neutral impact absent subsequent ownership or transactions.