Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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1. Name and Address of Reporting Person * Red Oak Partners, LLC 2. Issuer Name and Ticker or Trading Symbol DATA I/O CORP [DAIO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 40 SE 5TH STREET, SUITE 502 3. Date of Earliest Transaction (Month/Day/Year) 10/20/2026 (Street) BOCA RATON, FL 33432 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 10/20/2026 P 242,934 A $2.68 242,934 I By The Red Oak Fund, LP directly(1)(3) Common Stock 10/20/2026 P 130,199 A $2.68 130,199 I By The Red Oak Long Fund, LP directly(2)(3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

5% Convertible Debenture

$2.68

10/20/2026

P

$1,953,192.04(5)

(4)

10/20/2031

Common Stock

728,803

$1,953,192.04

$1,953,192.04

I

By The Red Oak Fund, LP directly(1)(3)

5% Convertible Debenture

$2.68

10/20/2026

P

$1,046,808(5)

(4)

10/20/2031

Common Stock

390,600

$1,046,808

$1,046,808

I

By The Red Oak Long Fund, LP directly(2)(3)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Red Oak Partners, LLC 40 SE 5TH STREET SUITE 502 BOCA RATON, FL 33432		X
Red Oak Fund, LP 40 SE 5TH STREET SUITE 502 BOCA RATON, FL 33432		X
Red Oak Long Fund, LP 40 SE 5TH STREET SUITE 502 BOCA RATON, FL 33432		X
Sandberg David 40 SE 5TH STREET SUITE 502 BOCA RATON, FL 33432		X

Signatures

David Sandberg		10/27/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Red Oak Partners, LLC ("ROP") serves as the general partner of The Red Oak Fund, LP, a Delaware limited partnership (the "Fund"), the direct owner of the subject securities. David Sandberg is the managing member of ROP and the Fund's portfolio manager.
(2)	ROP serves as the general partner of The Red Oak Long Fund, LP, a Delaware limited partnership (the "Long Fund"), the direct owner of the subject securities. David Sandberg is the managing member of ROP and the Long Fund's portfolio manager.
(3)	Each Reporting Person disclaims beneficial ownership of all securities reported herein, except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the shares for purposes of Section 16 of the Securities and Exchange Act of 1934 or for any other purpose.
(4)	Immediately exercisable.
(5)	The reporting persons purchased the 5% Convertible Debenture at 100% of its principal amount in a private placement pursuant to aa agreement dated October 20, 2026

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