Heather Kiessling, CFO of ASP Isotopes Inc. ($ASPI), made one open market sale of common shares in the last year, totaling $464 thousand. Her most recent transaction occurred on December 18, 2025. Among 11,678 individual insiders with sales, her amount ranks 6,624th, well below the average of $8.6 million per person across about 6.4 transactions. She reported no open market purchases.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 18, 2025 | ASP Isotopes Inc. | $ASPI | Kiessling Heather | Chief Financial Officer | S | Common Stock | 80000 | $5.80 | 732,500.0000 | 110,840,122 | 9.85% | 0.07% |
| April 14, 2025 | ASP Isotopes Inc. | $ASPI | Kiessling Heather | Chief Financial Officer | A | Common Stock | 400000 | $0.00 | 812,500.0000 | 72,068,059 | 96.97% | 0.56% |
| July 1, 2024 | ASP Isotopes Inc. | $ASPI | Kiessling Heather | Chief Financial Officer | A | Common Stock | 400000 | $0.00 | 412,500.0000 | 0 | 3200.00% | 0.00% |