Sec Form 4 Filing - Cameron Kevin J @ Ionetix Corp / DE / - 2026-04-09

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Cameron Kevin J 2. Issuer Name and Ticker or Trading Symbol Ionetix Corp / DE / [ NONE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) C/O IONETIX CORPORATION, 3130 SOVEREIGN DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 04/09/2026 (Street) LANSING, MI48911 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 04/09/2026 A 5,306,782 A 5,306,782 D Common Stock 04/09/2026 A 205,932 A 205,932 I By daughter ( 2 ) Common Stock 04/09/2026 A 206,209 A 206,209 I By son ( 2 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 0.32 04/09/2026 A 501,400 ( 3 ) 08/09/2028 Common Stock 501,400 ( 4 ) 501,400 D Stock Option (Right to Buy) $ 0.38 04/09/2026 A 334,266 ( 3 ) 06/08/2030 Common Stock 334,266 ( 4 ) 334,266 D Stock Option (Right to Buy) $ 0.62 04/09/2026 A 162,955 ( 3 ) 01/14/2034 Common Stock 162,955 ( 4 ) 162,955 D Stock Option (Right to Buy) $ 0.62 04/09/2026 A 162,955 ( 5 ) 01/14/2034 Common Stock 162,955 ( 4 ) 162,955 D Stock Option (Right to Buy) $ 0.98 04/09/2026 A 162,955 ( 6 ) 03/26/2035 Common Stock 162,955 ( 4 ) 162,955 D Stock Option (Right to Buy) $ 0.98 04/09/2026 A 162,955 ( 7 ) 03/16/2035 Common Stock 162,955 ( 4 ) 162,955 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Cameron Kevin J C/O IONETIX CORPORATION 3130 SOVEREIGN DRIVE LANSING, MI48911 President and CEO Signatures /s/ Phieu Phun, as Attorney-in-Fact for Kevin J Cameron 05/13/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Received in connection with the Issuer's merger (the "Merger") with Ionetix Corporation ("Legacy Ionetix") in accordance with the terms of the Agreement and Plan of Merger and Reorganization dated as of April 9, 2026 (the "Merger Agreement"), by and among the Issuer (f/k/a JDEV Acquisition Corp.), JDEV Merger Subsidiary and Legacy Ionetix. Pursuant to the terms of the Merger Agreement, each outstanding share of Legacy Ionetix common stock was entitled to receive 0.5014 (the "Conversion Ratio") shares of the Issuer's Common Stock. The Merger closed on April 9, 2026. ( 2 )The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. ( 3 )The stock option is fully vested and exercisable. ( 4 )Received in connection with the Merger in exchange for options to acquire shares of Legacy Ionetix common stock adjusted by the Conversion Ratio. ( 5 )The stock option vests in 48 monthly installments beginning on January 15, 2025. ( 6 )The stock option vests in 48 monthly installments beginning on March 27, 2026. ( 7 )The stock option vests in 48 monthly installments beginning on March 17, 2026.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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