Data I/O lists Red Oak funds with 0-share entries

Data I/O Corp (DAIO) identifies Red Oak Partners, LLC, Red Oak Fund, LP, Red Oak Long Fund, LP, and David Sandberg as ten percent owners.

Filing Impact

(High)

Filing Sentiment

(Neutral)How Sentiment works

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

How Sentiment works How the balance works

Form Type

Rhea-AI Filing Summary

Data I/O Corp (DAIO) identifies Red Oak Partners, LLC, Red Oak Fund, LP, Red Oak Long Fund, LP, and David Sandberg as ten percent owners. Red Oak Partners is general partner of both funds; David Sandberg is its managing member and portfolio manager of both. The common-stock holding entries dated October 20, 2026 name each fund as direct owner and report 0 shares following each entry. Each reporting person disclaims beneficial ownership except to the extent of any pecuniary interest.

Insights

Analyzing...

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Red Oak Partners, LLC, Red Oak Fund, LP, Red Oak Long Fund, LP, Sandberg David

Role 10% Owner | 10% Owner | 10% Owner | 10% Owner

Type	Security	Shares	Price	Value
holding	Common Stock ^{F1, F3}	--	--	--
holding	Common Stock ^{F2, F3}	--	--	--

Holdings After Transaction: Common Stock — 0 shares (Indirect, By The Red Oak Fund, LP directly); Common Stock — 0 shares (Indirect, By The Red Oak Long Fund, LP directly)

Footnotes (3)

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.

Key Figures

Shares following entry: 0 shares Shares following entry: 0 shares

2 metrics

Shares following entry 0 shares The Red Oak Fund, LP common-stock holding entry dated October 20, 2026

Shares following entry 0 shares The Red Oak Long Fund, LP common-stock holding entry dated October 20, 2026

Key Terms

beneficial ownership, pecuniary interest, general partner

3 terms

beneficial ownership regulatory

"disclaims beneficial ownership of all securities reported herein"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of their pecuniary interest therein"

general partner financial

"serves as the general partner of The Red Oak Fund, LP"

A general partner is the person or firm that runs an investment partnership and legally represents it — they make the day-to-day decisions, choose which assets to buy or sell, and are responsible for the partnership’s obligations. Investors care because the general partner’s judgment, risk-taking and fee and profit-sharing arrangements determine both the potential returns and the level of exposure to losses; think of the GP as the ship’s captain whose skill and honesty shape the voyage’s outcome.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/27/2026 - 04:57 PM EDT Accepted by SEC EDGAR 10/27/2026 - 04:56 PM EDT

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Red Oak Partners, LLC

(Last)

(First)

(Middle)

40 SE 5TH STREET

SUITE 502

(Street)

BOCA RATON

FLORIDA

33432

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
10/20/2026

3. Issuer Name and Ticker or Trading Symbol
DATA I/O CORP [ DAIO ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	0	I	By The Red Oak Fund, LP directly⁽¹⁾⁽³⁾
Common Stock	0	I	By The Red Oak Long Fund, LP directly⁽²⁾⁽³⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)

1. Name and Address of Reporting Person^*

Red Oak Partners, LLC

(Last)

(First)

(Middle)

40 SE 5TH STREET

SUITE 502

(Street)

BOCA RATON

FLORIDA

33432

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

FLORIDA

33432

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

FLORIDA

33432

(City)

(State)

(Zip)

UNITED STATES

(Country)

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

FLORIDA

33432

(City)

(State)

(Zip)

UNITED STATES

(Country)

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.

	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 5 (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 3: SEC 1473 (03-26)