Data I/O: Red Oak Fund buys $1.95M in convertible notes

The debentures are immediately exercisable into common shares at a $2.68 conversion price and expire October 20, 2031.

Rhea-AI Filing Summary

DATA I/O Corp. reports that The Red Oak Fund, LP purchased 242,934 common shares and The Red Oak Long Fund, LP purchased 130,199 common shares on October 20, 2026, each at $2.68 per share. The funds also purchased 5% Convertible Debentures in a private placement at 100% of principal: $1,953,192.04 for The Red Oak Fund and $1,046,808 for The Red Oak Long Fund. The debentures are immediately exercisable into 728,803 and 390,600 common shares, respectively, at a $2.68 conversion price, and expire October 20, 2031. Red Oak Partners, LLC, The Red Oak Fund, LP, The Red Oak Long Fund, LP and David Sandberg are identified as 10% owners. Red Oak Partners is the funds’ general partner; Sandberg is its managing member and their portfolio manager. The reporting persons disclaim beneficial ownership except to the extent of any pecuniary interest. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Buyer: 373,133 shares

Net Buy 4 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

Bought 373,133 shs

Type	Security	Shares	Price	Value
Purchase	5% Convertible Debenture F5, F4, F1, F3	--	$1,953,192.04	--
Purchase	5% Convertible Debenture F5, F4, F2, F3	--	$1,046,808.00	--
Purchase	Common Stock F1, F3	242,934	$2.68	$651K
Purchase	Common Stock F2, F3	130,199	$2.68	$349K

Holdings After Transaction: 5% Convertible Debenture — 0 contracts (Indirect, By The Red Oak Fund, LP directly); 5% Convertible Debenture — 0 contracts (Indirect, By The Red Oak Long Fund, LP directly); Common Stock — 242,934 shares (Indirect, By The Red Oak Fund, LP directly); Common Stock — 130,199 shares (Indirect, By The Red Oak Long Fund, LP directly)

Footnotes (5)

1. 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.
2. 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.
3. 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.
4. F4. Immediately exercisable.
5. 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

Key Figures

Common shares purchased — The Red Oak Fund, LP: 242,934 shares at $2.68 per share Common shares purchased — The Red Oak Long Fund, LP: 130,199 shares at $2.68 per share Debenture purchase — The Red Oak Fund, LP: $1,953,192.04 at 100% of principal +3 more

6 metrics

Common shares purchased — The Red Oak Fund, LP 242,934 shares at $2.68 per share October 20, 2026

Common shares purchased — The Red Oak Long Fund, LP 130,199 shares at $2.68 per share October 20, 2026

Debenture purchase — The Red Oak Fund, LP $1,953,192.04 at 100% of principal Private placement; October 20, 2026

Debenture purchase — The Red Oak Long Fund, LP $1,046,808 at 100% of principal Private placement; October 20, 2026

Underlying common shares — The Red Oak Fund, LP debenture 728,803 shares at a $2.68 conversion price Immediately exercisable; expires October 20, 2031

Underlying common shares — The Red Oak Long Fund, LP debenture 390,600 shares at a $2.68 conversion price Immediately exercisable; expires October 20, 2031

Key Terms

5% Convertible Debenture, principal amount, private placement, Immediately exercisable, +1 more

5 terms

5% Convertible Debenture financial

"purchased the 5% Convertible Debenture"

principal amount financial

"at 100% of its principal amount"

The principal amount is the original sum of money that is borrowed, lent, or invested before any interest, fees, or returns are added. It matters to investors because interest charges, scheduled repayments, and total return are calculated from that base amount — think of it as the price tag on which future costs or gains are built. Knowing the principal helps you compare deals and predict cash flows and risk.

private placement financial

"in a private placement"

A private placement is a sale of securities directly to a selected group of investors, typically institutions or accredited investors, instead of through a public offering. It lets a company raise money faster and with fewer regulatory steps; for existing shareholders it matters because the newly issued shares, often sold at a discount, increase the share count and can dilute their ownership.

Immediately exercisable financial

"Immediately exercisable."

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many DAIO common shares did the Red Oak funds buy?

On October 20, 2026, The Red Oak Fund, LP purchased 242,934 common shares and The Red Oak Long Fund, LP purchased 130,199 common shares, both at $2.68 per share. The funds directly own the reported stock positions. No Rule 10b5-1 plan is reported.

What are the terms of the DAIO convertible debentures?

The Red Oak Fund, LP purchased a debenture for $1,953,192.04 and The Red Oak Long Fund, LP purchased one for $1,046,808, each at 100% of principal in a private placement. They are immediately exercisable into 728,803 and 390,600 common shares, respectively, at a $2.68 conversion price, and expire October 20, 2031.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/27/2026 - 05:32 PM EDT Accepted by SEC EDGAR 10/27/2026 - 05:32 PM EDT Learn about SEC filing dates

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 FLORIDA 33432

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

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

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

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

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)

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)
				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)

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.

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: SEC 1474 (03-26)