Latest filingSep 25, 2026Most recent Form 4
ASPN
ASPEN AEROGELS INC
NYSEConsumer DiscretionaryWholesale-Lumber & Other Construction Materials
Insider activity for last month from 08/25 to 09/25. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$58.0M1 sells
Net open-market-$58.0M2 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly purchases, sales and code-A awards Buys Sells Awards / grants (A)
Code A includes awards, grants and other acquisitions; these are not open-market buys.
Distinct insiders active
Reporting-owner CIKs by month · peak Sep 2026 (2)Aug 2026Sep 2026
Top insiders
By absolute net value across the selected period- WL-$58.1M
Recent filing activity
Most recent 1 transactions · color = transaction code- SSell09/25-$58.0MSEC
Filing detail checks
Secondary metrics for the selected periodTransaction codes
By Form 4 transaction code in selected period1transactionstxns
- S · Open-market sells · dominant1 · 100%
Activity by reported role
A joint filing can contribute to multiple roles1transactionstxns
- 10% owner · dominant1 · 100%
Reported Holdings After
Separated by insider, security, and ownership type
Wood River Capital, LLCCommon Stock · Direct
0Sep 23, 2026
Koch, Inc.Common Stock · Direct
0Sep 23, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 25 → Sep 25
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Filing-only signals
Deterministic matches in the selected period
No filing-only signal badges matched this period.
ASPN transaction history
Filters apply within this company and selected period by defaultLatest insider transactions
Form 4 filings from last month. Click any column to sort; click it again to flip the order.
ASPEN AEROGELS INC Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at ASPEN AEROGELS INC?
Koch, Inc., Wood River Capital, LLC.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Wood River Capital, LLC reported a sale on Sep 23, 2026 valued at $58.0M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $58,086,414.98. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.