Aspen Aerogels, Inc. has 4 Schedule 13D or 13G filings on record since 2026-02-13. No holder's latest filing reports 5% or more. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 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 |
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 |
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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.