GROSSO CHRISTOPHER G 4

What Happened
Christopher G. Grosso, a 10% owner of Radnostix, purchased a $500,000 convertible promissory note from Kershner, Grosso & Co. on 2026-06-26. The instrument is a derivative (a convertible note) rather than an immediate share purchase; it converts into common stock at $0.07 per share (which equates to approximately 7,142,857 shares based on principal only). The note bears simple interest at 5% per annum, with the company able to pay interest in cash or in kind (PIK) for the first two years.

Key Details

• Transaction date: 2026-06-26; Transaction code: P (Purchase of a derivative).
• Instrument/value: $500,000 convertible promissory note; conversion price $0.07 per share.
• Approximate shares on conversion (principal only): 7,142,857 shares (accrued interest not included).
• Interest: 5% simple interest per year; interest may be paid in cash or PIK for first two years (PIK increases principal for future interest).
• Company right: Radnostix may force conversion if the 30-day VWAP exceeds $0.12; maturity date shown in the filing text appears truncated.
• Related-party note: Lender identified as Kershner, Grosso & Co. (see footnote).
• Shares owned after transaction: Not specified in this Form 4 filing.
• Filing timeliness: Filing does not indicate a late filing.

Context
This is a purchase of a convertible debt instrument (derivative), not an outright stock purchase. If and when converted, the note would result in a large number of common shares at the stated conversion price; accrued interest and any anti-dilution adjustments could change the final share count. As a 10% owner, Grosso is a significant holder—these transactions are disclosures of related-party financing, not routine executive stock buys/sells.