ASP Isotopes Inc. (ASPI) Insider Trading

Last 12 months

Insiders bought $62k and sold $9.53M on the open market.

79% of the selling was scheduled in advance under 10b5-1 plans. Director Todd Wider sold $619k on Jun 30, 13% of their stake, outside a plan.

Net open-market

−$9.47M

2 buys · 24 sales

Under a 10b5-1 plan

79%

of the value sold

Insiders who bought / sold

1 / 7

executives and directors

Last open-market buy

Sep 2026

Sep 30, 2026

Get an email when ASPI's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Oct 16	Heather Kiessling Chief Financial Officer	SoldNo plan	21,830	$2.19	$48k	1.4%	Form 4
Oct 14	Robert Ainscow COO	Sold10b5-1 plan	22,500	$2.11	$48k	1.0%	Form 4
Sep 30	Robert John Andrew Ryan Director	Bought	15,000	$2.68	$40k	2.3%	Form 4
Sep 28	Robert John Andrew Ryan Director	Bought	8,000	$2.70	$22k	1.2%	Form 4
Sep 8	Robert Ainscow COO	Sold10b5-1 plan	8,438	$4.29	$36k	0.4%	Form 4
Sep 2 – 4	Paul Elliot Mann Chairman and CEO	Sold10b5-1 plan 3 parts	251,275	$3.98 average	$999k	2.6%	Form 4
Sep 2	Donald George Ainscow EVP, Gen Counsel, Secretary	SoldNo plan	23,678	$3.89	$92k	3.0%	Form 4
Sep 2	Robert Ainscow COO	Sold10b5-1 plan	25,000	$3.91	$98k	1.1%	Form 4
Jul 1	Heather Kiessling Chief Financial Officer	Sold10b5-1 plan	23,124	$6.28	$145k	1.5%	Form 4
Jun 30	Donald George Ainscow EVP, Gen Counsel, Secretary	SoldNo plan	100,000	$6.14	$614k	11%	Form 4
Jun 29 – 30	Todd Wider Director	SoldNo plan 2 parts	100,000	$6.19 average	$619k	13%	Form 4
Jun 30	Michael Gorley Director	SoldNo plan	30,000	$6.27	$188k	25%	Form 4
Jun 8	Robert Ainscow COO	Sold10b5-1 plan	8,438	$7.00	$59k	0.4%	Form 4
Jun 1 – 3	Paul Elliot Mann Chairman and CEO	Sold10b5-1 plan 3 parts	251,275	$7.98 average	$2M	2.6%	Form 4
Apr 16	Robert Ainscow COO	Sold10b5-1 plan	22,500	$5.21	$117k	1.5%	Form 4
Apr 16	Duncan Moore Director	Sold10b5-1 plan	11,642	$5.21	$61k	1.1%	Form 4
Apr 15	Heather Kiessling Chief Financial Officer	Sold10b5-1 plan	23,124	$5.48	$127k	3.2%	Form 4
Mar 6	Robert Ainscow COO	Sold10b5-1 plan	25,000	$4.51	$113k	1.6%	Form 4
Mar 6	Robert Ainscow COO	Sold10b5-1 plan	8,438	$5.44	$46k	0.5%	Form 4
Mar 2	Paul Elliot Mann Executive Chairman	Sold10b5-1 plan	162,153	$5.44	$882k	2.2%	Form 4
Dec 18, 2025	Heather Kiessling Chief Financial Officer	SoldNo plan	80,000	$5.80	$464k	9.8%	Form 4
Dec 8, 2025	Robert Ainscow Interim CEO and COO	Sold10b5-1 plan	8,438	$6.20	$52k	0.5%	Form 4
Dec 1, 2025	Paul Elliot Mann Executive Chairman	Sold10b5-1 plan	162,153	$5.75	$932k	2.0%	Form 4
Nov 25, 2025	Robert Ainscow Interim CEO and COO	Sold10b5-1 plan	25,000	$5.77	$144k	1.6%	Form 4
Nov 17, 2025 – Nov 25, 2025	Paul Elliot Mann Executive Officer	Sold10b5-1 plan 2 parts	162,500	$6.97 average	$1.13M	2.0%	Form 4
Nov 17, 2025	Robert Ainscow Interim CEO and COO	Sold10b5-1 plan	67,500	$7.51	$507k	4.1%	Form 4
Oct 14, 2025	Robert Ainscow Interim CEO and COO	Sold10b5-1 plan	22,500	$13.60	$306k	1.3%	Form 4
Sep 30, 2025	Michael Gorley Director	SoldNo plan	64,000	$9.75	$624k	44%	Form 4
Sep 15, 2025	Todd Wider Director	SoldNo plan	74,108	$8.76	$649k	9.4%	Form 4
Sep 8, 2025 – Sep 9, 2025	Paul Elliot Mann Chief Executive Officer	Sold10b5-1 plan 2 parts	162,153	$8.46 average	$1.37M	2.0%	Form 4
Sep 8, 2025	Robert Ainscow Chief Operating Officer	Sold10b5-1 plan	8,438	$8.53	$72k	0.5%	Form 4
Aug 29, 2025	Duncan Moore Director	SoldNo plan	75,000	$9.28	$696k	7.0%	Form 4
Apr 15, 2025 – Apr 17, 2025	Robert Ainscow Chief Operating Officer	Sold10b5-1 plan 3 parts	200,000	$5.61 average	$1.12M	12%	Form 4
Apr 15, 2025 – Apr 17, 2025	Paul Elliot Mann Chief Executive Officer	Sold10b5-1 plan 3 parts	950,000	$5.61 average	$5.33M	11%	Form 4

Oct 16No plan
Heather Kiessling
Chief Financial Officer · sold 21,830 at $2.19
$48k
1.4% of stake
Oct 1410b5-1 plan
Robert Ainscow
COO · sold 22,500 at $2.11
$48k
1.0% of stake
Sep 30
Robert John Andrew Ryan
Director · bought 15,000 at $2.68
$40k
2.3% of stake
Sep 28
Robert John Andrew Ryan
Director · bought 8,000 at $2.70
$22k
1.2% of stake
Sep 810b5-1 plan
Robert Ainscow
COO · sold 8,438 at $4.29
$36k
0.4% of stake
Sep 2 – 410b5-1 plan
Paul Elliot Mann
Chairman and CEO · sold 251,275 at avg $3.98
$999k
2.6% of stake
Sep 2No plan
Donald George Ainscow
EVP, Gen Counsel, Secretary · sold 23,678 at $3.89
$92k
3.0% of stake
Sep 210b5-1 plan
Robert Ainscow
COO · sold 25,000 at $3.91
$98k
1.1% of stake
Jul 110b5-1 plan
Heather Kiessling
Chief Financial Officer · sold 23,124 at $6.28
$145k
1.5% of stake
Jun 30No plan
Donald George Ainscow
EVP, Gen Counsel, Secretary · sold 100,000 at $6.14
$614k
11% of stake
Jun 29 – 30No plan
Todd Wider
Director · sold 100,000 at avg $6.19
$619k
13% of stake
Jun 30No plan
Michael Gorley
Director · sold 30,000 at $6.27
$188k
25% of stake
Jun 810b5-1 plan
Robert Ainscow
COO · sold 8,438 at $7.00
$59k
0.4% of stake
Jun 1 – 310b5-1 plan
Paul Elliot Mann
Chairman and CEO · sold 251,275 at avg $7.98
$2M
2.6% of stake
Apr 1610b5-1 plan
Robert Ainscow
COO · sold 22,500 at $5.21
$117k
1.5% of stake
Apr 1610b5-1 plan
Duncan Moore
Director · sold 11,642 at $5.21
$61k
1.1% of stake
Apr 1510b5-1 plan
Heather Kiessling
Chief Financial Officer · sold 23,124 at $5.48
$127k
3.2% of stake
Mar 610b5-1 plan
Robert Ainscow
COO · sold 25,000 at $4.51
$113k
1.6% of stake
Mar 610b5-1 plan
Robert Ainscow
COO · sold 8,438 at $5.44
$46k
0.5% of stake
Mar 210b5-1 plan
Paul Elliot Mann
Executive Chairman · sold 162,153 at $5.44
$882k
2.2% of stake
Dec 18, 2025No plan
Heather Kiessling
Chief Financial Officer · sold 80,000 at $5.80
$464k
9.8% of stake
Dec 8, 202510b5-1 plan
Robert Ainscow
Interim CEO and COO · sold 8,438 at $6.20
$52k
0.5% of stake
Dec 1, 202510b5-1 plan
Paul Elliot Mann
Executive Chairman · sold 162,153 at $5.75
$932k
2.0% of stake
Nov 25, 202510b5-1 plan
Robert Ainscow
Interim CEO and COO · sold 25,000 at $5.77
$144k
1.6% of stake
Nov 17, 2025 – Nov 25, 202510b5-1 plan
Paul Elliot Mann
Executive Officer · sold 162,500 at avg $6.97
$1.13M
2.0% of stake
Nov 17, 202510b5-1 plan
Robert Ainscow
Interim CEO and COO · sold 67,500 at $7.51
$507k
4.1% of stake
Oct 14, 202510b5-1 plan
Robert Ainscow
Interim CEO and COO · sold 22,500 at $13.60
$306k
1.3% of stake
Sep 30, 2025No plan
Michael Gorley
Director · sold 64,000 at $9.75
$624k
44% of stake
Sep 15, 2025No plan
Todd Wider
Director · sold 74,108 at $8.76
$649k
9.4% of stake
Sep 8, 2025 – Sep 9, 202510b5-1 plan
Paul Elliot Mann
Chief Executive Officer · sold 162,153 at avg $8.46
$1.37M
2.0% of stake
Sep 8, 202510b5-1 plan
Robert Ainscow
Chief Operating Officer · sold 8,438 at $8.53
$72k
0.5% of stake
Aug 29, 2025No plan
Duncan Moore
Director · sold 75,000 at $9.28
$696k
7.0% of stake
Apr 15, 2025 – Apr 17, 202510b5-1 plan
Robert Ainscow
Chief Operating Officer · sold 200,000 at avg $5.61
$1.12M
12% of stake
Apr 15, 2025 – Apr 17, 202510b5-1 plan
Paul Elliot Mann
Chief Executive Officer · sold 950,000 at avg $5.61
$5.33M
11% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch ASPI, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in ASPI's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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