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ASPN SCHEDULE 13G/A: SEC filing

Filed with the SEC on · accession 0000919574-26-005154

ASPN filed a SCHEDULE 13G/A (schedule 13g/a) with the SEC on Aug 13, 2026. Needham Investment Management LLC, Needham Asset Management LLC, and George A. The stock moved -1.3% by the first close after the filing.

Summary of the filing

Needham Investment Management LLC, Needham Asset Management LLC, and George A. Needham filed a joint filing agreement as part of an amended Schedule 13G regarding their beneficial ownership of Aspen Aerogels Inc common stock. The filing indicates a passive investment position with no stated plans to influence company control.

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Key details

Issuer of securities subject to the schedule 13gAspen Aerogels Inc
Filer / beneficial ownerNeedham Investment Management L.L.C.
Filer / beneficial ownerNeedham Asset Management, LLC
Chief financial officer, needham investment management l.l.c. and needham asset management, llcJames W. Giangrasso
Individual filerGeorge A. Needham

How ASPN stock reacted

Close before

$6.15

Aug 12, 2026

First close after

-1.30%

$6.07

5 trading days

-11.38%

$5.45

Since filing

-20.16%

$4.91

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Frequently asked questions

What did ASPN file with the SEC on Aug 13, 2026?

ASPN filed a SCHEDULE 13G/A (SEC filing). Needham Investment Management LLC, Needham Asset Management LLC, and George A. Needham filed a joint filing agreement as part of an amended Schedule 13G regarding their beneficial ownership of Aspen Aerogels Inc common stock. The filing indicates a passive investment position with no stated plans to influence company control.

How do I read a SCHEDULE 13G/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13G/A (schedule 13g/a): A report the company filed with the SEC (the US market regulator).

How did ASPN stock react to this filing?

ASPN closed at $6.15 before the filing and $6.07 on Aug 13, 2026 (-1.30%). Five trading days later: $5.45 (-11.38%).

Other ASPN SEC filings

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