ASP Isotopes (ASPI) COO Robert Ainscow Sells 8,438 Shares

What Happened Robert Ainscow, Chief Operating Officer of ASP Isotopes Inc. (ASPI), sold 8,438 shares on September 8, 2026, generating approximately $36,216. The reported weighted-average price was $4.29 per share; individual sale prices ranged from $4.185 to $4.39. This transaction is recorded as a sale (S) and was effected pursuant to a Rule 10b5-1 plan to cover tax withholding.

Key Details

• Transaction date: 2026-09-08; Form 4 filed: 2026-09-10 (timely filing).
• Shares sold: 8,438; weighted-average price: $4.29; total proceeds ≈ $36,216.
• Price range for the multiple trades: $4.185 to $4.39 (reporting person can provide breakouts on request).
• Footnote: Sale executed under a 10b5-1 trading plan adopted June 9, 2025 for tax withholding on vested restricted stock awards (i.e., "sell to cover").
• Shares owned after transaction: Not disclosed in the provided filing details.

Context

• This was a routine sell-to-cover transaction under a pre-established 10b5-1 plan to satisfy tax withholding obligations tied to restricted stock vesting, not a discretionary open-market sell signaling a change in view.
• For retail investors, such tax-related sales are common and generally less informative about an insider’s view of the company than voluntary open-market purchases.