NEEDHAM INVESTMENT MANAGEMENT LLC - 31 Dec 2025 SCHEDULE 13G Report for Aspen Aerogels Inc Common Stock, par value $0.00001 per share (ASPN)

Filing Manager
NEEDHAM INVESTMENT MANAGEMENT LLC
Reporting Manager
NEEDHAM INVESTMENT MANAGEMENT L.L.C.
Security
Aspen Aerogels Inc Common Stock, par value $0.00001 per share
Symbol
ASPN
Shares outstanding
82,107,547 shares
Disclosed Ownership
4,351,700 shares
Ownership
5.3%
Form type
SCHEDULE 13G
Filing time
13 Feb 2026, 17:44:24 UTC
Date of event
31 Dec 2025
SEC
View on sec.gov

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
NEEDHAM INVESTMENT MANAGEMENT L.L.C. 5.3% 4,351,700 0 4,351,700 By: /s/ James W. Giangrasso James W. Giangrasso, Chief Financial Officer
NEEDHAM ASSET MANAGEMENT, LLC 5.3% 4,351,700 0 4,351,700 By: /s/ James W. Giangrasso James W. Giangrasso, Authorized Person
GEORGE A. NEEDHAM 5.3% 4,351,700 0 4,351,700 By: /s/ George A. Needham George A. Needham