09:26 AM EDT, 09/29/2025 (MT Newswires) -- ASP Isotopes ( ASPI ) said Monday that chief executive officer Paul Mann will take a temporary leave for health reasons from Oct. 1.

Robert Ainscow, currently chief operating officer, will serve as CEO in the interim, the company said.

Separately, ASP Isotopes ( ASPI ) subsidiary Quantum Leap Energy appointed Michael Cunniffe as chief financial officer from Oct. 1, according to the company.

Cunniffe, most recently served as managing director UK for Danforth Advisors, and succeeds Heather Kiessling who will continue to serve as CFO of ASP Isotopes ( ASPI ).

Shares of the company were up 1% in recent Monday premarket activity.