Company · Ownership research

ASP Isotopes Inc. ASPI

CIK 0001921865

Form 4 transactions dated Nov 1, 2023 to Nov 8, 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 ·

202610 of 25 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Oct 16, 2026	Kiessling Heather Chief Financial Officer	Sale	$47.81K 21,830 shares sold	1.43% sold Direct holding	▾
Oct 14, 2026	Ainscow Robert COO	Sale10b5-1 footnote	$47.56K 22,500 shares sold	1.00% sold Direct holding	▾
Sep 30, 2026	Ryan Robert John Andrew Director	Purchase	$40.20K 15,000 shares bought	2.27% added Direct holding	▾
Sep 28, 2026	Ryan Robert John Andrew Director	Purchase	$21.60K 8,000 shares bought	1.23% added Direct holding	▾
Sep 8, 2026	Ainscow Robert COO	Sale10b5-1 footnote	$36.22K 8,438 shares sold	0.37% sold Direct holding	▾
Sep 4, 2026	Mann Paul Elliot Chairman and CEO · Director	Sale10b5-1 footnote	$343.41K 83,759 shares sold	0.89% sold Direct holding	▾
Sep 3, 2026	Mann Paul Elliot Chairman and CEO · Director	Sale10b5-1 footnote	$328.33K 83,758 shares sold	0.88% sold Direct holding	▾
Sep 2, 2026	Ainscow Donald George EVP, Gen Counsel, Secretary	Sale	$92.11K 23,678 shares sold	2.96% sold Direct holding	▾
Sep 2, 2026	Ainscow Robert COO	Sale10b5-1 footnote	$97.63K 25,000 shares sold	1.10% sold Direct holding	▾
Sep 2, 2026	Mann Paul Elliot Chairman and CEO · Director	Sale10b5-1 footnote	$327.49K 83,758 shares sold	0.87% sold Direct holding	▾

Showing 25 / 25 record groups in 2026. The complete set is available through the API.

ASP Isotopes Inc. · ASPI

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 25 of 25 purchase / sale groups and 4 of 4 other groups; the totals and the monthly series cover the whole window.

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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.