Buy4

DATA I/O CORP

DAIO

Total Value

$1000.0K

Net $1000.0K bought

Filing Date

Oct 27, 2026

2 transactions

Purchases

$1000.0K

2 transactions

Trade Summary

On Oct 20, 2026, Red Oak Partners, LLC, 10% Owner, purchased $1000.0K of DATA I/O CORP (DAIO) across 2 transactions. The filing covers Common Stock and reflects net buying of $1000.0K. Reported prices ranged from $2.68. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Price at the Time of the Trade

DAIO daily price with the insider's purchase marked at $2.68.

Bought near the 6-month low · the stock trades 5% lower today.

Price data is delayed and provided for context only — not investment advice.

Insider Information

Name: Red Oak Partners, LLC
Role: 10% Owner
Location: BOCA RATON, FL

Filing Details

Filing Date: Oct 27, 2026
Transaction Date: Oct 20, 2026
Accession Number: 0001325533-26-000012
Form Type: 4
Net Trading Amount: $1000.0K

Non-Derivative Transactions

Date	Security	Shares	Price	Type	Value
Oct 20, 2026	Common Stock	242,934	$2.68	Purchase	$651.1K
Oct 20, 2026	Common Stock	130,199	$2.68	Purchase	$348.9K

Derivative Transactions

Date	Security	Shares	Exercise Price	Type	Value
Oct 20, 2026	DAIO derivative	—	$2.68	Purchase	—
Oct 20, 2026	DAIO derivative	—	$2.68	Purchase	—

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Footnotes

(F1)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.
(F2)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.
(F3)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.
(F4)Immediately exercisable.
(F5)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

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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 for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Red Oak Partners, LLC

(Last)

(First)

(Middle)

40 SE 5TH STREET

SUITE 502

(Street)

BOCA RATON

33432

(City)

(State)

(Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
10/20/2026

4. If Amendment, Date of 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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
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⁾

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 Securities Underlying Derivative Security (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: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
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⁾

1. Name and Address of Reporting Person^*

Red Oak Partners, LLC

(Last)

(First)

(Middle)

40 SE 5TH STREET

SUITE 502

(Street)

BOCA RATON

33432

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director	X	10% Owner
Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Red Oak Fund, LP

(Last)

(First)

(Middle)

40 SE 5TH STREET

SUITE 502

(Street)

BOCA RATON

33432

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director	X	10% Owner
Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Red Oak Long Fund, LP

(Last)

(First)

(Middle)

40 SE 5TH STREET

SUITE 502

(Street)

BOCA RATON

33432

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director	X	10% Owner
Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Sandberg David

(Last)

(First)

(Middle)

40 SE 5TH STREET

SUITE 502

(Street)

BOCA RATON

33432

(City)

(State)

(Zip)

Relationship of Reporting Person(s) to Issuer

Director	X	10% Owner
Officer (give title below)		Other (specify below)

Explanation of Responses:

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

	David Sandberg	10/27/2026
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Form 4 as rendered by the SEC from accession 0001325533-26-000012.

DATA I/O CORP

Trade Summary

Price at the Time of the Trade

Company Information

Insider Information

Filing Details

Non-Derivative Transactions

Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

Price at the Time of the Trade

SEC Form 4