ASP Isotopes Inc. shares fall 1.05% after-hours as it prepares for secondary listing on JSE.

Asp Isotopes Inc. declined 1.05% in after-hours trading, with the company hosting an investor access event in Pretoria for approximately 30 South African investors. The company expects to have a secondary listing on the Johannesburg Stock Exchange (JSE) and its common stock is expected to commence trading on the JSE on Wednesday, August 27, 2025. Additionally, ASP Isotopes has shipped its first samples of enriched Silicon-28 to a US-based customer and expects to complete the enrichment of the first samples of Ytterbium 176 during August 2025.