SEC Form 4
Aspen Aerogels, Inc. (ASPN) insider trading
In the 12 months to Oct 26, 2026, 2 ASPN insiders reported open-market sales of $58.3M across 2 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $58.3M
- 2 filings · 2 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 1 of 2
- $183.6K of $58.3M sold (0%)
Who traded ASPN, and when
- Sale
- Sale, pre-arranged (10b5-1)
ASPN daily close from Oct 27, 2025 to Oct 26, 2026, between $2.57 and $8.14, last $5.29. 2 sale and 0 purchase filings by 2 insiders, marked at their filing dates. Wood River Capital, LLC, Other: sold $58.1M across 1 filing, first filed Sep 24, 2026, last Sep 24, 2026. Donald R. Young, President and CEO: sold $183.6K across 1 filing, first filed Nov 14, 2025, last Nov 14, 2025.
Largest mark · tap a row for others
Wood River Capital, LLC · Other
Sale $58,086,415
12,280,426 shares at $4.73 avg
Filed Sep 24, 2026 · traded Sep 23
Close on filing date $5.30
Wood River Capital, LLC · Other
Other
$58.1M soldDonald R. Young · President and CEO
President and CEO
$183.6K soldOpen-market trades
2 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Wood River Capital, LLC | Other | $58.1M | — | 1 | — | |
| Donald R. Young | President and CEO | $183.6K | — | 1 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Wood River Capital, LLC Other | Sale | 12,280,426 | $4.73 | $58.1M | 0 | |
traded | Donald R. Young President and CEO | SalePre-arranged (10b5-1) | 56,845 | $3.23 | $183.6K | 494,011 |
GET /stocks/filings/vX/form-4?tickers=ASPN&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"ASPN"
],
"issuer_cik": "0001145986",
"owner_cik": "0001888978",
"accession_number": "0001193125-26-401380",
"form_type": "4",
"filing_date": "2026-09-24",
"period_of_report": "2026-09-23",
"issuer_name": "ASPEN AEROGELS INC",
"issuer_trading_symbol": "ASPN",
"owner_name": "Wood River Capital, LLC",
"is_director": false,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": true,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-09-23",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 12280426,
"transaction_price_per_share": 4.73,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 0,
"transaction_value": 58086414.980000004,
"not_subject_to_section_16": true,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The sale was executed in a single block trade at $4.73 per share."
},
{
"id": "F2",
"description": "Wood River is beneficially owned by SCC Holdings, LLC (\"SCC\"), SCC is beneficially owned by KIM, LLC (\"KIM\"), KIM is beneficially owned by Koch Investments Group, LLC (\"KIG\"), KIG is beneficially owned by Koch Investments Group Holdings, LLC (\"KIGH\"), and KIGH is beneficially owned by Koch Industries, Inc. (\"Koch Industries\"), in each case by means of ownership of all voting equity instruments. Koch Industries, SCC, KIM, KIG, and KIGH may be deemed to beneficially own the shares of the Issuer's common stock beneficially owned by Wood River by virtue of (i) Koch Industries' beneficial ownership of KIGH, (ii) KIGH's beneficial ownership of KIG, (iii) KIG's beneficial ownership of KIM, (iv) KIM's beneficial ownership of SCC and (v) SCC's beneficial ownership of Wood River."
}
]
},
{
"tickers": [
"ASPN"
],
"issuer_cik": "0001145986",
"owner_cik": "0002027344",
"accession_number": "0001193125-26-401380",
"form_type": "4",
"filing_date": "2026-09-24",
"period_of_report": "2026-09-23",
"issuer_name": "ASPEN AEROGELS INC",
"issuer_trading_symbol": "ASPN",
"owner_name": "Koch, Inc.",
"is_director": false,
"is_officer": false,
"is_ten_percent_owner": true,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-09-23",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 12280426,
"transaction_price_per_share": 4.73,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 0,
"transaction_value": 58086414.980000004,
"not_subject_to_section_16": true,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The sale was executed in a single block trade at $4.73 per share."
},
{
"id": "F2",
"description": "Wood River is beneficially owned by SCC Holdings, LLC (\"SCC\"), SCC is beneficially owned by KIM, LLC (\"KIM\"), KIM is beneficially owned by Koch Investments Group, LLC (\"KIG\"), KIG is beneficially owned by Koch Investments Group Holdings, LLC (\"KIGH\"), and KIGH is beneficially owned by Koch Industries, Inc. (\"Koch Industries\"), in each case by means of ownership of all voting equity instruments. Koch Industries, SCC, KIM, KIG, and KIGH may be deemed to beneficially own the shares of the Issuer's common stock beneficially owned by Wood River by virtue of (i) Koch Industries' beneficial ownership of KIGH, (ii) KIGH's beneficial ownership of KIG, (iii) KIG's beneficial ownership of KIM, (iv) KIM's beneficial ownership of SCC and (v) SCC's beneficial ownership of Wood River."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 22 records
- Option exercises1 record
- Tax withholding10 records
- Grants and awards11 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.
Frequently asked questions
Has Aspen Aerogels, Inc.'s CEO sold stock?
Yes. Donald R. Young (CEO) sold 56,845 shares ($183.6K) in Nov 2025, all under a pre-arranged 10b5-1 plan.
How current is ASPN’s insider data?
These are ASPN Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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Track ASPN insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for ASPN every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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