Heather Kiessling

CIK: 0002026548

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)4 (66.7%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)2 (33.3%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

ASPI

ASP Isotopes Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (6 total)

ASPI
ASP Isotopes Inc.
Oct 16, 2026
Sale(S)
Direct
21.8K shares at avg. $2.19$48K
ASPI
ASP Isotopes Inc.
Jul 1, 2026
Sale(S)
Direct
23.1K shares at avg. $6.28$145K
ASPI
ASP Isotopes Inc.
May 28, 2026
Award(A)
Direct
840K shares-
ASPI
ASP Isotopes Inc.
Apr 15, 2026
Sale(S)
Direct
23.1K shares at avg. $5.48$127K
ASPI
ASP Isotopes Inc.
Dec 18, 2025
Sale(S)
Direct
80K shares at avg. $5.80$464K
ASPI
ASP Isotopes Inc.
Apr 14, 2025
Award(A)
Direct
400K shares-

		Type	Shares	Price		Ownership
Oct 16, 2026	ASPI ASP Isotopes Inc.	Sale(S)	21,830	$2.19	$47,808	Direct
Jul 1, 2026	ASPI ASP Isotopes Inc.	Sale(S)	23,124	$6.28	$145,219	Direct
May 28, 2026	ASPI ASP Isotopes Inc.	Award(A)	840,000	-	$0	Direct
Apr 15, 2026	ASPI ASP Isotopes Inc.	Sale(S)	23,124	$5.48	$126,673	Direct
Dec 18, 2025	ASPI ASP Isotopes Inc.	Sale(S)	80,000	$5.80	$463,840	Direct
Apr 14, 2025	ASPI ASP Isotopes Inc.	Award(A)	400,000	-	-	Direct

1-6 of 6 transactions

About Kiessling Heather

Kiessling Heather (SEC CIK 0002026548) files insider reports with the SEC as Chief Financial Officer of ASP Isotopes Inc. (ASPI).

Signal8 holds 6 ownership filings by Kiessling Heather, all Form 4s, filed between Apr 15, 2025 and Oct 21, 2026. Those filings report 6 transactions, from Apr 14, 2025 to Oct 16, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Kiessling Heather's filings is in DALLAS, TX.

Recent filings by Kiessling Heather

Oct 16, 2026: Open-market sale of ASPI shares (Form 4, code S).
Jul 1, 2026: Open-market sale of ASPI shares (Form 4, code S).
May 28, 2026: Grant or award of ASPI shares (Form 4, code A).
Apr 15, 2026: Open-market sale of ASPI shares (Form 4, code S).
Dec 18, 2025: Open-market sale of ASPI shares (Form 4, code S).

Other insiders filing for ASP Isotopes Inc. (ASPI)

Ainscow Robert, COO
Ryan Robert John Andrew, Director
Ainscow Donald George, EVP, Gen Counsel, Secretary
Mann Paul Elliot, Chairman and CEO
Wider Todd, Director
Gorley Michael, Director

How to read Form 4 transaction codes