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Paul Elliot Mann, Chief Executive Officer and a director at ASP Isotopes Inc (NASDAQ:ASPI), sold 162,153 shares of common stock on September 8 and 9, 2025, for approximately $1.37 million. The sales occurred at prices ranging from $8.3886 to $8.5279. The transaction comes as ASPI shares have delivered a remarkable 232% return over the past year, according to InvestingPro data.
According to a Form 4 filing with the Securities and Exchange Commission, the transactions were executed to cover tax withholding obligations related to the vesting of restricted stock awards, pursuant to a pre-arranged Rule 10b5-1 trading plan.
On September 9, Mann also exercised options to acquire 1,216,000 shares of ASP Isotopes common stock at a price of $2.00 per share, for a total value of $2,432,000.
Additionally, the company withheld 285,110 shares for $2,431,988 to cover the exercise price associated with the stock options.
Following these transactions, Mann directly owns 8,084,191 shares of ASP Isotopes Inc.
In other recent news, ASP Isotopes Inc. has made several strategic moves. The company announced a Memorandum of Understanding with Fermi America to explore developing a High Assay Low Enriched Uranium (HALEU) enrichment facility in Texas. This facility aims to bolster domestic supply chains for nuclear fuel. ASP Isotopes also formed a joint venture with Fermi America and its subsidiary Quantum Leap Energy LLC to advance the production of HALEU for small modular reactors. Additionally, ASP Isotopes has invested $5 million in seed funding into IsoBio, Inc., a company focused on developing antibody-isotope conjugates for cancer treatment. On the corporate governance front, Ralph L. Hunter has been appointed to the board of directors of ASP Isotopes and its subsidiary Quantum Leap Energy LLC. Hunter brings over 30 years of experience in the nuclear power industry. These developments reflect ASP Isotopes’ ongoing efforts to expand its capabilities in nuclear technology and materials.
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