As of November 6, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Aspen Aerogels, Inc. The largest reported stake is Orin Hirschman's, at 8.6%. 5 filings are on record since February 13, 2026 (Schedule 13G, October 19, 2026).
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Key facts
- · Reporting person: Orin Hirschman · Sole voting: 7,150,126 · Shared voting: 0 · Sole dispositive: 7,150,126 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-19
- · Reporting person: Wood River Capital, LLC · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-09-24
- · Reporting person: Needham Investment Management L.L.C. · Sole voting: 0 · Shared voting: 3,260,800 · Sole dispositive: 0 · Shared dispositive: 3,260,800 · SCHEDULE 13G/A, 2026-08-13
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
- · Holder: Needham Investment Management L.L.C. · Percent: 5.3% · SCHEDULE 13G
Aspen Aerogels, Inc. has 5 Schedule 13D or 13G filings on record since 2026-02-13. 1 holder's latest filing reports 5% or more of common stock, $0.00001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 8.6% | 7,150,126 | SCHEDULE 13G, 2026-10-19 | 2026-09-30 | |
| Needham Investment Management L.L.C. | 3.9% | 3,260,800 | SCHEDULE 13G/A, 2026-08-13 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
| Wood River Capital, LLC | 0% | 0 | SCHEDULE 13D/A, 2026-09-24 | 2026-09-23 |
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More on Aspen Aerogels, Inc. and the records around it.
Aspen Aerogels, Inc. elsewhere on the record
Companies that share a holder
- Needham Investment Management L.L.C. also filed stake reports on 13 other companies: Elmet Group Co. (Aug 2026), LANTRONIX INC (Jul 2026), Precision Optics Corporation, Inc. (May 2026)
- Orin Hirschman also filed stake reports on 46 other companies: Bionano Genomics, Inc. (Oct 2026), FENNEC PHARMACEUTICALS INC. (Oct 2026), DOMO, INC. (Oct 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Orin Hirschman | 7,150,126 | 0 | 7,150,126 | 0 | SCHEDULE 13G, 2026-10-19 |
| AIGH Capital Management LLC | 7,150,126 | 0 | 7,150,126 | 0 | SCHEDULE 13G, 2026-10-19 |
| Needham Investment Management L.L.C. | 0 | 3,260,800 | 0 | 3,260,800 | SCHEDULE 13G/A, 2026-08-13 |
| Needham Asset Management, LLC | 0 | 3,260,800 | 0 | 3,260,800 | SCHEDULE 13G/A, 2026-08-13 |
| George A. Needham | 0 | 3,260,800 | 0 | 3,260,800 | SCHEDULE 13G/A, 2026-08-13 |
| Wood River Capital, LLC | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-09-24 |
| Koch, Inc. | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-09-24 |
The latest filing identifies Aspen Aerogels, Inc. by CUSIP 04523Y105 and gives its principal executive office as 30 Forbes Road, Building B, Northborough, MA 01532 (SCHEDULE 13G, 2026-10-19).
Purpose of Transaction (Item 4)
Wood River Capital, LLC
Item 4 of the Initial Schedule 13D is hereby amended and supplemented as follows: On September 23, 2026, the Reporting Persons disposed of all Public Shares beneficially owned by the Reporting Persons and ceased to be the beneficial owner of any Public Shares. The Reporting Persons do not have any present plans or proposals that relate to or would result in any of the actions specified in Item 4(a) through 4(j) of this Schedule 13D.Item 4 of the SCHEDULE 13D/A filed 2026-09-24
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-02-13 | Needham Investment Management L.L.C. | 5.3% | SCHEDULE 13G |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-08-13 | Needham Investment Management L.L.C. | 3.9% | SCHEDULE 13G/A |
| 2026-09-24 | Wood River Capital, LLC | 0% | SCHEDULE 13D/A |
| 2026-10-19 | Orin Hirschman | 8.6% | SCHEDULE 13G |
Questions about who owns Aspen Aerogels, Inc.
Who owns Aspen Aerogels, Inc.?
On this page, one holder's latest ownership filing reports 5% or more of Aspen Aerogels, Inc.: Orin Hirschman (8.6%, Schedule 13G, filed 2026-10-19).
When did Orin Hirschman buy into Aspen Aerogels, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Orin Hirschman on this page is the Schedule 13G, filed 2026-10-19, reporting 8.6%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 5 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.