Form 4: ASPI Executive Sells Shares Under 10b5-1 Plans

ASP Isotopes Inc. Director and Executive Officer Paul Elliot Mann sold a total of 162,500 shares of common stock in two separate transactions in November 2025.

Summary

• Paul Elliot Mann, a Director and Executive Officer of ASP Isotopes Inc. (ASPI), reported two sales of common stock.
• On November 17, 2025, 112,500 shares were sold at a weighted average price of $7.507 per share, ranging from $7.215 to $7.85.
• This sale was a 'sell to cover' transaction to meet tax withholding obligations related to restricted stock awards, executed under a Rule 10b5-1 trading plan adopted on June 9, 2025.
• On November 25, 2025, an additional 50,000 shares were sold at a weighted average price of $5.769 per share, ranging from $5.54 to $6.015.
• This second sale was also conducted pursuant to a Rule 10b5-1 trading plan, adopted on December 13, 2024.
• Following these transactions, Paul Elliot Mann beneficially owns 7,921,691 shares of ASP Isotopes Inc. common stock.

Sentiment

Score: 4

Explanation: The filing reports significant insider selling by a key executive, which generally carries a negative sentiment. While the sales were pre-planned under Rule 10b5-1 and one transaction was for tax obligations, the overall reduction in beneficial ownership by 162,500 shares indicates a decrease in direct insider stake.

Positives

• The sales were conducted under Rule 10b5-1 trading plans, indicating they were pre-scheduled and not based on immediate, non-public information.
• A significant portion of the sales (112,500 shares) was explicitly for 'sell to cover' tax withholding obligations related to restricted stock awards, which is a routine and often necessary transaction for executives.

Negatives

• Paul Elliot Mann, a Director and Executive Officer, reduced his direct beneficial ownership of ASP Isotopes Inc. common stock by a total of 162,500 shares.
• The second sale of 50,000 shares was not explicitly stated to be for tax withholding, suggesting a general reduction in personal holdings.
• The sales occurred at different price points, with the second transaction (50,000 shares) executed at a lower weighted average price of $5.769 compared to the first transaction's $7.507.

Risks

• Insider selling, even if pre-planned, can be interpreted by the market as a signal of reduced confidence in the company's future prospects or that the stock is fully valued, potentially leading to negative share price pressure.

Future Outlook

This Form 4 filing does not contain any forward-looking statements or guidance regarding the company's future outlook.

Management Comments

• The reporting person undertakes to provide ASP Isotopes Inc., any stockholder, or the SEC staff, upon request, full information regarding the number of shares sold at each separate price within the reported ranges.

Industry Context

This insider transaction report is specific to ASP Isotopes Inc. and its executive's stock holdings. It does not provide broader industry trends or competitive analysis.

Comparison to Industry Standards

• NA

Stakeholder Impact

• Shareholders may interpret the reduction in a key executive's beneficial ownership as a signal of potentially reduced confidence in the company's near-term prospects, which could influence investment decisions.
• The 'sell to cover' portion of the sale is a common practice for executives receiving equity compensation and is generally viewed as less impactful than discretionary sales.

Next Steps

• The reporting person has committed to providing detailed information on the specific prices of shares sold within the stated ranges upon request from the company, stockholders, or the SEC.

Key Dates

Recommendation

While the sales were pre-planned under Rule 10b5-1, reducing the immediate negative impact, the overall reduction in insider ownership by a key executive warrants a cautious 'hold' stance rather than a 'buy' or 'sell' based solely on this filing. The first sale was explicitly for tax obligations, which is a common and less concerning reason for insider selling. The second sale, however, was not explicitly for tax purposes, which could be interpreted as a more general reduction in exposure, suggesting a neutral to slightly negative outlook from the insider.

Keywords

ASP Isotopes Inc., ASPI, Form 4, Insider Trading, Stock Sale, Paul Elliot Mann, 10b5-1 Plan, Director, Executive Officer, Equity Sales