ASP Isotopes' stock jumped 14% on Tuesday after the company announced that it had successfully brought its Silicon-28 enrichment facility in Pretoria, South Africa, back into operation. Management said the first 18 stages of the plant have been operating at the target enrichment levels for over three weeks following a prolonged period of engineering work.
The firm attributed the stoppage and subsequent corrective program to problems with non-core hardware. Over nine months, engineering teams addressed issues in components such as valves, compressors, and piping that were not meeting original equipment manufacturer specifications. According to company statements, those modifications were necessary to reach the expected enrichment performance.
ASP Isotopes also reported that it shipped its first samples of enriched Silicon-28 to a U.S. customer in August 2025. Independent analysis of those samples confirmed that enrichment levels tracked in line with theoretical calculations, the company said. Following customer visits in the second half of 2025, the business began implementing the engineering changes that have now resulted in sustained target performance in the first 18 stages.
Heino Van-Wyk, Head of Engineering at the company, said the core enrichment technology behaved as anticipated but that many of the ancillary components did not operate to OEM supplier specifications. The engineering organization spent nine months correcting those non-core issues, allowing the restarted stages to run at the intended enrichment metrics.
With the initial stages demonstrating consistent output, ASP Isotopes plans to apply the same engineering enhancements to the remaining stages of the facility to enable commercial production. The company has already signed three commercial contracts with U.S.-based customers for enriched Silicon-28 and expects to make initial commercial shipments in the third quarter of 2026.
Enriched Silicon-28 is a material used in quantum computing and in next-generation semiconductor technologies. In quantum computing applications, the isotope helps qubits retain entangled states for longer periods. The isotope is also reported to offer improved heat conduction and dissipation properties, which could benefit conventional semiconductor performance.
Stefano Marani, President of ASP Isotopes' Electronics and Space division, said demand interest has been notable as the company scales its production capabilities. The company’s near-term path centers on completing the engineering modifications across the facility and fulfilling the commercial contracts that have been signed.
Context for markets and technology sectors
The operational progress and the signed contracts tie directly to technology sectors that depend on high-purity isotopes, particularly quantum computing and advanced semiconductors, as well as suppliers and manufacturers involved in isotope production equipment and plant operations.