ASPI

Basic Materials

ASP Isotopes Inc. Common Stock

$5.29-0.56 (-9.53%)

Prev Close

$5.85

Open

$5.89

High

$6.15

Low

$5.20

Volume

5.35M

Market Cap

$552.5M

P/E

—

Div Yield

—

Over the past 12 months, insider activity at ASP Isotopes Inc. Common Stock (ASPI) has been exclusively selling, with 0 insider purchases totaling $0.00 and 16 insider sales totaling $17.28M. The most recent insider transaction was by Ainscow Robert (officer: COO), who sold $45.9K worth of shares on Mar 6, 2026. ASP Isotopes Inc. Common Stock operates in the Basic Materials sector, within the Chemicals industry, with a market cap of $552.5M.

Buys (12M)

$0.00

Sells (12M)

$17.28M

Net Activity

Net Seller

$17.28M

Active Insiders

last 12 mo

ASPI Price Chart

ASPI Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 6, 2026↗	Ainscow Robert	officer: COO	Sell	8,438	$5.44	$45.9K	1,537,820
Mar 2, 2026↗	Mann Paul Elliot	officer: Executive Chairman	Sell	162,153	$5.44	$881.5K	7,597,380
Dec 18, 2025↗	Kiessling Heather	Chief Financial Officer	Sell	80,000	$5.80	$463.8K	0
Dec 8, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	8,438	$6.20	$52.3K	0
Dec 1, 2025↗	Mann Paul Elliot	Executive Chairman	Sell	162,153	$5.75	$932.9K	0
Nov 25, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	25,000	$5.77	$144.2K	0
Nov 17, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	67,500	$7.51	$506.7K	0
Nov 17, 2025↗	Mann Paul Elliot	Executive Officer	Sell	162,500	$6.97	$1.13M	0
Oct 14, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	22,500	$13.60	$306.0K	0
Sep 30, 2025↗	Gorley Michael	Director	Sell	64,000	$9.75	$624.2K	0
Sep 14, 2025↗	Wider Todd	Director	Sell	96,000	$8.76	$840.8K	0
Sep 8, 2025↗	Ainscow Robert	Chief Operating Officer	Sell	47,299	$8.53	$403.4K	0
Sep 8, 2025↗	Mann Paul Elliot	Chief Executive Officer	Sell	447,263	$8.50	$3.80M	0
Aug 29, 2025↗	Moore Duncan	Director	Sell	75,000	$9.28	$696.2K	0
Apr 15, 2025↗	Ainscow Robert	Chief Operating Officer	Sell	200,000	$5.61	$1.12M	0
Apr 15, 2025↗	Mann Paul Elliot	Chief Executive Officer	Sell	950,000	$5.61	$5.33M	0
Apr 29, 2024↗	Ryan Robert John Andrew	Director	Buy	20,547	$3.38	$69.5K	0
Apr 26, 2024↗	Ryan Robert John Andrew	Director	Buy	5,000	$3.48	$17.4K	0
Apr 25, 2024↗	Ryan Robert John Andrew	Director	Buy	9,500	$3.42	$32.5K	0
Jan 14, 2024↗	Ryan Robert John Andrew	Director	Buy	18,346	$2.29	$42.0K	0
Oct 26, 2023↗	Donfeld Joshua Jay	Director	Buy	104,167	$0.96	$100.0K	0
Oct 26, 2023↗	Wider Todd	Director	Buy	94,844	$0.96	$91.1K	0
Aug 10, 2023↗	Moore Duncan	Director	Buy	104,167	$0.96	$100.0K	0
Jun 29, 2023↗	Moore Duncan	Director	Buy	100,000	$0.50	$50.0K	0
May 18, 2023↗	Moore Duncan	Director	Buy	20,000	$0.31	$6.2K	0
May 10, 2023↗	Moore Duncan	Director	Buy	10,000	$0.50	$5.0K	0
Apr 6, 2023↗	Moore Duncan	Director	Buy	20,000	$1.00	$20.0K	0

ASPI Insider Buying Activity

The following table shows recent insider purchases of ASP Isotopes Inc. Common Stock (ASPI) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value
Apr 29, 2024↗	Ryan Robert John Andrew	Director	Buy	20,547	$3.38	$69.5K
Apr 26, 2024↗	Ryan Robert John Andrew	Director	Buy	5,000	$3.48	$17.4K
Apr 25, 2024↗	Ryan Robert John Andrew	Director	Buy	9,500	$3.42	$32.5K
Jan 14, 2024↗	Ryan Robert John Andrew	Director	Buy	18,346	$2.29	$42.0K
Oct 26, 2023↗	Donfeld Joshua Jay	Director	Buy	104,167	$0.96	$100.0K
Oct 26, 2023↗	Wider Todd	Director	Buy	94,844	$0.96	$91.1K
Aug 10, 2023↗	Moore Duncan	Director	Buy	104,167	$0.96	$100.0K
Jun 29, 2023↗	Moore Duncan	Director	Buy	100,000	$0.50	$50.0K
May 18, 2023↗	Moore Duncan	Director	Buy	20,000	$0.31	$6.2K
May 10, 2023↗	Moore Duncan	Director	Buy	10,000	$0.50	$5.0K
Apr 6, 2023↗	Moore Duncan	Director	Buy	20,000	$1.00	$20.0K

ASPI Insider Selling Activity

The following table shows recent insider sales of ASP Isotopes Inc. Common Stock (ASPI) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 6, 2026↗	Ainscow Robert	officer: COO	Sell	8,438	$5.44	$45.9K	1,537,820
Mar 2, 2026↗	Mann Paul Elliot	officer: Executive Chairman	Sell	162,153	$5.44	$881.5K	7,597,380
Dec 18, 2025↗	Kiessling Heather	Chief Financial Officer	Sell	80,000	$5.80	$463.8K	0
Dec 8, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	8,438	$6.20	$52.3K	0
Dec 1, 2025↗	Mann Paul Elliot	Executive Chairman	Sell	162,153	$5.75	$932.9K	0
Nov 25, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	25,000	$5.77	$144.2K	0
Nov 17, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	67,500	$7.51	$506.7K	0
Nov 17, 2025↗	Mann Paul Elliot	Executive Officer	Sell	162,500	$6.97	$1.13M	0
Oct 14, 2025↗	Ainscow Robert	Interim CEO and COO	Sell	22,500	$13.60	$306.0K	0
Sep 30, 2025↗	Gorley Michael	Director	Sell	64,000	$9.75	$624.2K	0
Sep 14, 2025↗	Wider Todd	Director	Sell	96,000	$8.76	$840.8K	0
Sep 8, 2025↗	Ainscow Robert	Chief Operating Officer	Sell	47,299	$8.53	$403.4K	0
Sep 8, 2025↗	Mann Paul Elliot	Chief Executive Officer	Sell	447,263	$8.50	$3.80M	0
Aug 29, 2025↗	Moore Duncan	Director	Sell	75,000	$9.28	$696.2K	0
Apr 15, 2025↗	Ainscow Robert	Chief Operating Officer	Sell	200,000	$5.61	$1.12M	0
Apr 15, 2025↗	Mann Paul Elliot	Chief Executive Officer	Sell	950,000	$5.61	$5.33M	0