Red Oak Partners, LLC - 20 Oct 2026 Form 4 Insider Report for DATA I/O CORP (DAIO)

Reporting relationship
10%+ Owner
Issuer ticker
DAIO
Reported as of
20 Oct 2026
Net transaction value
+$999,996
Source evidence Original filing metadata and source links for verification. 4 source fields
SEC form
4
Accepted by SEC
27 Oct 2026, 17:32:18 UTC
Prior SEC filing
03 Sep 2026
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
David Sandberg
Filing notes and source

Key filing fact

Red Oak Partners, LLC filed Form 4 for DATA I/O CORP (DAIO) on 27 Oct 2026.

Key facts

  • This page summarizes Red Oak Partners, LLC's Form 4 filing for DATA I/O CORP (DAIO).
  • 4 reported transactions and 8 derivative rows are listed below.
  • Accepted by SEC: 27 Oct 2026, 17:32.

Change

  • Previous filing in this sequence was filed on 03 Sep 2026.
  • Current net transaction value: +$999,996.

Research use

  • This tells you what this filing adds before you inspect full transaction and derivative tables.
  • You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (4)

CIK 0001325533 Primary reporting owner

Red Oak Partners, LLC

Relationship
10%+ Owner
Address
40 SE 5TH STREET, SUITE 502, BOCA RATON
Signature
David Sandberg
Signature date
27 Oct 2026
CIK 0001397261

Red Oak Fund, LP

Relationship
10%+ Owner
Address
40 SE 5TH STREET, SUITE 502, BOCA RATON
Signature
David Sandberg
Signature date
27 Oct 2026
CIK 0001605605

Red Oak Long Fund, LP

Relationship
10%+ Owner
Address
40 SE 5TH STREET, SUITE 502, BOCA RATON
Signature
David Sandberg
Signature date
27 Oct 2026
CIK 0001423093

Sandberg David

Relationship
10%+ Owner
Address
40 SE 5TH STREET, SUITE 502, BOCA RATON
Signature
David Sandberg
Signature date
27 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DAIO transaction

Common Stock

Purchase

Transaction value
$651,063
Shares
+242,934
Change %
Price
$2.68
Shares after
242,934
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Footnotes
F1, F3
DAIO transaction

Common Stock

Purchase

Transaction value
$651,063
Shares
+242,934
Change %
Price
$2.68
Shares after
242,934
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Footnotes
F1, F3
DAIO transaction

Common Stock

Purchase

Transaction value
$651,063
Shares
+242,934
Change %
Price
$2.68
Shares after
242,934
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Footnotes
F1, F3
DAIO transaction

Common Stock

Purchase

Transaction value
$651,063
Shares
+242,934
Change %
Price
$2.68
Shares after
242,934
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Footnotes
F1, F3
DAIO transaction

Common Stock

Purchase

Transaction value
$348,933
Shares
+130,199
Change %
Price
$2.68
Shares after
130,199
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Footnotes
F2, F3
DAIO transaction

Common Stock

Purchase

Transaction value
$348,933
Shares
+130,199
Change %
Price
$2.68
Shares after
130,199
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Footnotes
F2, F3
DAIO transaction

Common Stock

Purchase

Transaction value
$348,933
Shares
+130,199
Change %
Price
$2.68
Shares after
130,199
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Footnotes
F2, F3
DAIO transaction

Common Stock

Purchase

Transaction value
$348,933
Shares
+130,199
Change %
Price
$2.68
Shares after
130,199
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Footnotes
F2, F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,953,192
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Underlying class
Common Stock
Underlying amount
728,803
Exercise price
$2.68
Footnotes
F1, F3, F4, F5
DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,953,192
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Underlying class
Common Stock
Underlying amount
728,803
Exercise price
$2.68
Footnotes
F1, F3, F4, F5
DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,953,192
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Underlying class
Common Stock
Underlying amount
728,803
Exercise price
$2.68
Footnotes
F1, F3, F4, F5
DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,953,192
Date
20 Oct 2026
Ownership
By The Red Oak Fund, LP directly
Underlying class
Common Stock
Underlying amount
728,803
Exercise price
$2.68
Footnotes
F1, F3, F4, F5
DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,046,808
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Underlying class
Common Stock
Underlying amount
390,600
Exercise price
$2.68
Footnotes
F2, F3, F4, F5
DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,046,808
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Underlying class
Common Stock
Underlying amount
390,600
Exercise price
$2.68
Footnotes
F2, F3, F4, F5
DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,046,808
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Underlying class
Common Stock
Underlying amount
390,600
Exercise price
$2.68
Footnotes
F2, F3, F4, F5
DAIO transaction Derivative

5% Convertible Debenture

Purchase

Transaction value
Shares
Change %
Price
Shares after
$1,046,808
Date
20 Oct 2026
Ownership
By The Red Oak Long Fund, LP directly
Underlying class
Common Stock
Underlying amount
390,600
Exercise price
$2.68
Footnotes
F2, F3, F4, F5
* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote 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.

Footnote 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.

Footnote 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.

Footnote F4

Immediately exercisable.

Footnote 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

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