ASP Isotopes is trading at $2.84, up 5.19% versus the previous close in pre-market after merger partner ENDRA Life Sciences filed an S-4 registration statement for the proposed transaction. - The filing is a key step; the merger still requires ENDRA shareholder approval and regulatory clearances. - The proposed merger involves ASP Isotopes subsidiaries Noble Africa and Renergen. - This company-specific update is the clearest identified catalyst for the October 2 move.