SEC Form 3 · accession 0001213900-26-081574

Ionetix Corp / DE /

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Director

Period of report

May 18, 2026

Accepted (ET)

Jul 27, 2026 · 7:22 am EDT

Rule 10b5-1 plan

unknown — predates the checkbox

Issuer CIK

0002108121

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1	holding	—	—		—	331,242	D

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Stock Option (Right to Buy)^F2	$0.38	holding	—	—	—	—	Jun 8, 2030	Common Stock	4,179	—	D
Stock Option (Right to Buy)^F2	$0.42	holding	—	—	—	—	Mar 11, 2031	Common Stock	9,401	—	D
Stock Option (Right to Buy)^F2	$0.62	holding	—	—	—	—	Jan 14, 2034	Common Stock	25,070	—	D
Stock Option (Right to Buy)^F3	$0.62	holding	—	—	—	—	Jan 14, 2034	Common Stock	25,070	—	D
Stock Option (Right to Buy)^F4	$0.98	holding	—	—	—	—	Mar 26, 2035	Common Stock	25,070	—	D
Stock Option (Right to Buy)^F5	$0.98	holding	—	—	—	—	Mar 16, 2035	Common Stock	25,070	—	D

F1Represents shares of the Issuer's Common Stock received in connection with the merger of Ionetix Corporation ("Legacy Ionetix") with a subsidiary of the Issuer, which closed on April 9, 2026.
F2The stock option is fully vested and exercisable.
F3The stock option vests in 48 monthly installments, subject to a one-year cliff, with vesting commencing on March 17, 2023.
F4The stock option vests in 48 monthly installments, subject to a one-year cliff, with vesting commencing on March 17, 2024.
F5The stock option vests in 48 monthly installments, subject to a one-year cliff, with vesting commencing on March 17, 2025.