KIESSLING HEATHER

PrivateCIK: 2026548
Location

WASHINGTON, DC, DC

KIESSLING HEATHER (Chief Financial Officer) sold 9.8% of their position (80K shares) of ASP ISOTOPES INC. on the open market

Open‑market sale worth $463.8K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale
InsiderKIESSLING HEATHERCIK 2026548
IssuerASP ISOTOPES INC.CIK 1921865
Officer· Chief Financial Officer
-80K
Net shares
Net seller
$463.8K
Total sold
1
Open market trades
0B · 1S
1
Total transactions
80K disposed
Non-Derivative Transactions1

Common Stock

Direct
S · Sale

Shares

80K

Price / share

$5.80

Trade value

$463.84K

% of position

9.8%
812.50K732.50K
Total

Net shares

80K

Net value

-$463.84K

Derivative Transactions0
No derivative transactions reported
KIESSLING HEATHER — Insider Transaction (Form 4) Filed Dec 29, 2025 | Finecho