Heather Kiessling sold $464K of ASP Isotopes (ASPI)

Executed Dec 18 2025, disclosed Dec 29 2025, 11 days later, against a two-business-day limit.

Value, as filed

$464K

80,000 sh × $5.80

Executed

Dec 18 2025

the trade date, as filed

Disclosed

Dec 29 2025

11 days after the trade · past the deadline

Return, 21 sessionsiFrom the disclosed entry session; derived

–

purchases only

Returns are measured on stock purchases only.

The filer

Heather Kiessling Chief Financial Officer profile →

Heather Kiessling (Chief Financial Officer) filed 3 Form 4 reports in the trailing twelve months (0 purchases, 3 sales, 1 filed past the two-business-day deadline), most often in ASP Isotopes Inc. (ASPI). The largest single filing was $464K of ASPI (80,000 sh × $5.80, as filed), executed Dec 18 2025.

The name

ASPI

ASP Isotopes Inc. ASPI · Basic Materials · 21 filings in 24 months ticker →

Basic Materials · ASP Isotopes Inc., a development stage advanced materials company, engages in the production, distribution, marketing, and sale of isotopes…

More Basic Materials filings→ Insider filings, newest first→ View the original filing at www.sec.gov→

Other filings by Heather Kiessling in ASPI

ASPISALE ASP Isotopes Inc. $145K
23,124 sh × $6.28
Exec Jul 1
Filed Jul 2 · 9:45 PM ET ASPISALE ASP Isotopes Inc. $127K
23,124 sh × $5.48
Exec Apr 15
Filed Apr 17 · 5:30 PM ET