Kiessling Heather

CIK: 0002026548•Chief Financial Officer

Officer

Primary company: ASP Isotopes Inc. (ASPI)

Kiessling Heather is a corporate insider (Chief Financial Officer) at ASP Isotopes Inc. (ASPI) filing SEC Form 4 transactions. 3 transactions, totaling $0 in purchases and $463,840 in sales. Source: SEC EDGAR.

Total Transactions

Total Buy Value

Total Sell Value

$464K

Net Activity

$-464K

Last Transaction

Dec 2025

Companies

Transaction History

Filter:

Source: SEC EDGAR Form 4 insider transaction filings.

Company	Type	Shares	Price	Value	Shares After	Date	SEC
ASP Isotopes Inc. ASPI	Sale	23,124	$5.48	$127K	709,376	4/15/2026 Filed: 4/17/2026	Filing →
ASP Isotopes Inc. ASPI	Sale	80,000	$5.80	$464K	732,500	12/18/2025 Filed: 12/29/2025	Filing →
ASP Isotopes Inc. ASPI	Award	400,000	-	-	812,500	4/14/2025 Filed: 4/15/2025	Filing →
ASP Isotopes Inc. ASPI	Award	400,000	-	-	412,500	7/1/2024 Filed: 7/1/2024	Filing →

ASP Isotopes Inc.

ASPI

Type

Sale

23,124

Price

$5.48

Value

$127K

ASP Isotopes Inc.

ASPI

Type

Sale

80,000

Price

$5.80

Value

$464K

ASP Isotopes Inc.

ASPI

Type

Award

400,000

Price

Value

ASP Isotopes Inc.

ASPI

Type

Award

400,000

Price

Value

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