Company · Ownership research

ASP Isotopes Inc. ASPI

CIK 0001921865

Form 4 transactions dated Nov 1, 2023 to Nov 10, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through Oct 21, 2026.

Insider purchases & sales

Purchased: —
Sold: $19.95M

Nov 1, 2023 – Oct 21, 2026
Available records · partial months are marked ·

202510 of 20 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Dec 18, 2025	Kiessling Heather Chief Financial Officer	Sale	$463.84K 80,000 shares sold	9.85% sold Direct holding	▾
Dec 8, 2025	Ainscow Robert Interim CEO and COO	Sale10b5-1 footnote	$52.34K 8,438 shares sold	0.54% sold Direct holding	▾
Dec 1, 2025	Mann Paul Elliot Executive Chairman · Director	Sale10b5-1 footnote	$932.87K 162,153 shares sold	2.05% sold Direct holding	▾
Nov 25, 2025	Ainscow Robert Interim CEO and COO	Sale10b5-1 footnote	$144.22K 25,000 shares sold	1.58% sold Direct holding	▾
Nov 25, 2025	Mann Paul Elliot Executive Officer · Director	Sale10b5-1 footnote	$288.45K 50,000 shares sold	0.63% sold Direct holding	▾
Nov 17, 2025	Mann Paul Elliot Executive Officer · Director	Sale10b5-1 footnote	$844.54K 112,500 shares sold	1.39% sold Direct holding	▾
Nov 17, 2025	Ainscow Robert Interim CEO and COO	Sale10b5-1 footnote	$506.72K 67,500 shares sold	4.10% sold Direct holding	▾
Oct 14, 2025	Ainscow Robert Interim CEO and COO	Sale10b5-1 footnote	$305.98K 22,500 shares sold	1.35% sold Direct holding	▾
Sep 30, 2025	Gorley Michael Director	Sale	$624.24K 64,000 shares sold	44.03% sold Direct holding	▾
Sep 15, 2025	Wider Todd Director	Sale	$648.82K 74,108 shares sold	9.45% sold Direct holding	▾

Showing 20 / 20 record groups in 2025. The complete set is available through the API.

ASP Isotopes Inc. · ASPI

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{"action":"list","ticker":"ASPI","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.