SEC Form 4
ASP Isotopes Inc. (ASPI) insider trading
In the 12 months to Oct 26, 2026, 7 ASPI insiders reported open-market sales of $2.6M across 9 filings; one director bought $61.8K.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $2.6M
- 9 filings · 7 insiders
- Open-market purchases
- $61.8K
- 2 filings · Robert John Andrew Ryan, Director
- Pre-arranged sales (10b5-1)
- 5 of 9
- $703.7K of $2.6M sold (27%)
Who traded ASPI, and when
- Purchase
- Sale
- Sale, pre-arranged (10b5-1)
ASPI daily close from Oct 27, 2025 to Oct 26, 2026, between $1.95 and $10.76, last $2.07. 9 sale and 2 purchase filings by 8 insiders, marked at their filing dates. Todd Wider, Director: sold $618.5K across 1 filing, first filed Jul 1, 2026, last Jul 1, 2026. Donald George Ainscow, EVP, Gen Counsel, Secretary: sold $614.0K across 1 filing, first filed Jul 2, 2026, last Jul 2, 2026. Heather Kiessling, Chief Financial Officer: sold $463.8K across 1 filing, first filed Dec 29, 2025, last Dec 29, 2025. Robert Ainscow, Interim CEO and COO → COO: sold $354.6K across 3 filings, first filed Nov 28, 2025, last Sep 4, 2026. Paul Elliot Mann, Executive Officer: sold $288.5K across 1 filing, first filed Nov 28, 2025, last Nov 28, 2025. Michael Gorley, Director: sold $188.1K across 1 filing, first filed Jul 1, 2026, last Jul 1, 2026. Robert John Andrew Ryan, Director: bought $61.8K across 2 filings, first filed Sep 30, 2026, last Oct 1, 2026. Duncan Moore, Director: sold $60.6K across 1 filing, first filed Apr 17, 2026, last Apr 17, 2026.
Largest mark · tap a row for others
Todd Wider · Director
Sale $618,500
100,000 shares at $6.19 avg
Filed Jul 1, 2026
Close on filing date $6.17
Todd Wider · Director
Director
$618.5K soldDonald George Ainscow · EVP, Gen Counsel, Secretary
EVP, Gen Counsel, Secretary
$614.0K soldHeather Kiessling · Chief Financial Officer
Chief Financial Officer
$463.8K soldRobert Ainscow · Interim CEO and COO → COO
Interim CEO and COO → COO
$354.6K soldPaul Elliot Mann · Executive Officer
Executive Officer
$288.5K soldMichael Gorley · Director
Director
$188.1K soldRobert John Andrew Ryan · Director
Director
$61.8K boughtDuncan Moore · Director
Director
$60.6K soldOpen-market trades
11 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Todd Wider | Director | $618.5K | — | 1 | — | |
| Donald George Ainscow | EVP, Gen Counsel, Secretary | $614.0K | — | 1 | — | |
| Heather Kiessling | Chief Financial Officer | $463.8K | — | 1 | — | |
| Robert Ainscow | Interim CEO and COO → COO | $354.6K | — | 3 | 100% of sales | |
| Paul Elliot Mann | Executive Officer | $288.5K | — | 1 | 100% of sales | |
| Michael Gorley | Director | $188.1K | — | 1 | — | |
| Robert John Andrew Ryan | Director | — | $61.8K | 2 | — | |
| Duncan Moore | Director | $60.6K | — | 1 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
| Robert John Andrew Ryan Director | Purchase | 15,000 | $2.68 | $40.2K | 675,222 | ||
| Robert John Andrew Ryan Director | Purchase | 8,000 | $2.70 | $21.6K | 660,222 | ||
| Robert Ainscow COO | SalePre-arranged (10b5-1) | 25,000 | $3.91 | $97.6K | 2,256,879 | ||
| Donald George Ainscow EVP, Gen Counsel, Secretary | Sale | 100,000 | $6.14 | $614.0K | 800,000 | ||
| Michael Gorley Director | Sale | 30,000 | $6.27 | $188.1K | 87,908 | ||
| Todd Wider Director | Sale | 100,000 | $6.19 | $618.5K | 672,247 | ||
| Duncan Moore Director | SalePre-arranged (10b5-1) | 11,642 | $5.21 | $60.6K | 1,044,928 | ||
| Robert Ainscow COO | SalePre-arranged (10b5-1) | 25,000 | $4.51 | $112.8K | 1,512,817 | ||
| Heather Kiessling Chief Financial Officer | Sale | 80,000 | $5.80 | $463.8K | 732,500 | ||
| Paul Elliot Mann Executive Officer | SalePre-arranged (10b5-1) | 50,000 | $5.77 | $288.5K | 7,921,691 | ||
| Robert Ainscow Interim CEO and COO | SalePre-arranged (10b5-1) | 25,000 | $5.77 | $144.2K | 1,554,693 |
GET /stocks/filings/vX/form-4?tickers=ASPI&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"ASPI"
],
"issuer_cik": "0001921865",
"owner_cik": "0002011790",
"accession_number": "0001477932-26-005964",
"form_type": "4",
"filing_date": "2026-10-01",
"period_of_report": "2026-09-30",
"issuer_name": "ASP Isotopes Inc.",
"issuer_trading_symbol": "ASPI",
"owner_name": "Ryan Robert John Andrew",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 15000,
"transaction_price_per_share": 2.68,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 675222,
"transaction_value": 40200,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.65 to $2.68, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the\n\"Company\"), any stockholder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."
}
]
},
{
"tickers": [
"ASPI"
],
"issuer_cik": "0001921865",
"owner_cik": "0002011790",
"accession_number": "0001477932-26-005918",
"form_type": "4",
"filing_date": "2026-09-30",
"period_of_report": "2026-09-28",
"issuer_name": "ASP Isotopes Inc.",
"issuer_trading_symbol": "ASPI",
"owner_name": "Ryan Robert John Andrew",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 8000,
"transaction_price_per_share": 2.7,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 660222,
"transaction_value": 21600,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.56 to $2.79, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the\n\"Company\"), any stockholder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."
}
]
}
]
}
// 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) · 33 records
- Tax withholding (sold to cover)20 records
- Grants and awards13 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.
- Role
- The title on each filing. Someone whose title changed shows more than one.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has ASP Isotopes Inc.'s CEO sold stock?
Yes. Robert Ainscow (CEO) sold 25,000 shares ($144.2K) in Nov 2025, all under a pre-arranged 10b5-1 plan. Paul Elliot Mann (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is ASPI’s insider data?
These are ASPI 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.
Build with AI
Track ASPI 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 ASPI 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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