As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Data I/O Corp. The largest reported stake is Red Oak Partners, LLC's, at 11.2%. 3 filings are on record since February 12, 2026 (Schedule 13G, October 27, 2026).
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Key facts
- · Reporting person: Red Oak Partners, LLC · Sole voting: 0 · Shared voting: 1,492,536 · Sole dispositive: 0 · Shared dispositive: 1,492,536 · SCHEDULE 13G, 2026-10-27
- · Reporting person: Lytton Laurence W · Sole voting: 145,540 · Shared voting: 880,884 · Sole dispositive: 145,540 · Shared dispositive: 880,884 · SCHEDULE 13G, 2026-06-23
- · Reporting person: Renaissance Technologies LLC · Sole voting: 437,637 · Shared voting: 0 · Sole dispositive: 437,637 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-02-12
Data I/O Corp has 3 Schedule 13D or 13G filings on record since 2026-02-12. 2 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Red Oak Partners, LLC | 11.2% | 1,492,536 | SCHEDULE 13G, 2026-10-27 | 2026-10-20 |
| 9.9% | 1,026,424 | SCHEDULE 13G, 2026-06-23 | 2026-06-17 | |
| Renaissance Technologies LLC | 4.66% | 437,637 | SCHEDULE 13G/A, 2026-02-12 | 2025-12-31 |
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Keep reading
More on Data I/O Corp and the records around it.
Data I/O Corp elsewhere on the record
- Company profile and every filing Nov 2026
- Form D filing Nov 2026
- Who owns it
Companies that share a holder
- Red Oak Partners, LLC also filed stake reports on 2 other companies: Motorsport Games Inc. (Jul 2026), Global Crossing Airlines Group Inc. (Nov 2025)
- LYTTON LAURENCE W also filed stake reports on 28 other companies: Retension Pharmaceuticals, Inc. (Oct 2026), Rank One Computing Corp (Aug 2026), MDxHealth SA (Aug 2026)
- Renaissance Technologies LLC also filed stake reports on 46 other companies: AMERICAN PUBLIC EDUCATION INC (Aug 2026), Bolt Biotherapeutics, Inc. (Aug 2026), Commercial Vehicle Group, Inc. (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Red Oak Partners, LLC | 0 | 1,492,536 | 0 | 1,492,536 | SCHEDULE 13G, 2026-10-27 |
| The Red Oak Fund, LP | 0 | 971,737 | 0 | 971,737 | SCHEDULE 13G, 2026-10-27 |
| The Red Oak Long Fund, LP | 0 | 520,799 | 0 | 520,799 | SCHEDULE 13G, 2026-10-27 |
| David Sandberg | 0 | 1,492,536 | 0 | 1,492,536 | SCHEDULE 13G, 2026-10-27 |
| Lytton Laurence W | 145,540 | 880,884 | 145,540 | 880,884 | SCHEDULE 13G, 2026-06-23 |
| Lytton-Kambara Foundation | 0 | 590,374 | 0 | 590,374 | SCHEDULE 13G, 2026-06-23 |
| AWL Family LLC | 0 | 300,208 | 0 | 300,208 | SCHEDULE 13G, 2026-06-23 |
| Renaissance Technologies LLC | 437,637 | 0 | 437,637 | 0 | SCHEDULE 13G/A, 2026-02-12 |
| Renaissance Technologies Holdings Corporation | 437,637 | 0 | 437,637 | 0 | SCHEDULE 13G/A, 2026-02-12 |
The latest filing identifies Data I/O Corp by CUSIP 237690102 and gives its principal executive office as 6645 185th Ave NE, Suite 100, Redmond, WA 98052 (SCHEDULE 13G, 2026-10-27).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-02-12 | Renaissance Technologies LLC | 4.66% | SCHEDULE 13G/A |
| 2026-06-23 | Lytton Laurence W | 9.9% | SCHEDULE 13G |
| 2026-10-27 | Red Oak Partners, LLC | 11.2% | SCHEDULE 13G |
Questions about who owns Data I/O Corp
Who owns Data I/O Corp?
On this page, 2 holders' latest ownership filings report 5% or more of Data I/O Corp: Red Oak Partners, LLC (11.2%, Schedule 13G, filed 2026-10-27) and Lytton Laurence W (9.9%, Schedule 13G, filed 2026-06-23).
Who are the largest shareholders of Data I/O Corp?
By the share each holder's latest filing reports, the largest holders of Data I/O Corp on this page are Red Oak Partners, LLC (11.2%) and Lytton Laurence W (9.9%).
When did Red Oak Partners, LLC buy into Data I/O Corp?
The filings give report dates, not purchase dates. The earliest filing from Red Oak Partners, LLC on this page is the Schedule 13G, filed 2026-10-27, reporting 11.2%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 3 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Data I/O Corp
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 4, 2026 | Form D amendment, private offering | $13.25M sold | Form D page | Source |
| November 4, 2026 | Form D, private offering | $3M sold | Form D page | Source |
| November 3, 2026 | Form D, private offering | $13.25M sold | Form D page | Source |
| July 13, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
Data I/O Corp: every filing and event
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.