As of November 9, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Trio-Tech International. The largest reported stake is Yong Siew Wai's, at 16.9%. 4 filings are on record since January 21, 2026 (Schedule 13D/A, January 29, 2026).
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Key facts
- · Reporting person: Horowitz Richard M · Sole voting: 902,353 · Shared voting: 0 · Sole dispositive: 902,353 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-06-25
- · Holder: Zeff Capital, LP · Percent: 1.28% · SCHEDULE 13G/A
- · Holder: Yong Siew Wai · Percent: 16.9% · SCHEDULE 13D/A
- · Holder: Zeff Capital, LP · Percent: 5.9% · SCHEDULE 13G/A
Trio-Tech International has 4 Schedule 13D or 13G filings on record since 2026-01-21. 2 holders' latest filing reports 5% or more of common stock, no par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 16.9% | 1,470,290 | SCHEDULE 13D/A, 2026-01-29 | 2026-01-27 | |
| 8.6% | 902,353 | SCHEDULE 13D/A, 2026-06-25 | 2025-12-16 | |
| Zeff Capital, LP | 1.28% | 127,856 | SCHEDULE 13G/A, 2026-05-01 | 2026-04-22 |
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Horowitz Richard M | 902,353 | 0 | 902,353 | 0 | SCHEDULE 13D/A, 2026-06-25 |
The latest filing identifies Trio-Tech International by CUSIP 896712205 and gives its principal executive office as 16139 WYANDOTTE ST., VAN NUYS, CA 91406 (SCHEDULE 13D/A, 2026-06-25).
Source of funds (Item 3)
The securities reported herein include shares that were acquired by the Reporting Person through grants of shares by the Issuer from time to time and through the use of personal funds. Of the 902,353 shares deemed beneficially owned by Mr. Horowitz, 237,569 are subject to currently exercisable options.Horowitz Richard M, SCHEDULE 13D/A, 2026-06-25
Purpose of Transaction (Item 4)
Yong Siew Wai
Mr. Yong holds the shares of Company Common Stock beneficially owned and deemed to be beneficially owned by him for investment. The Reporting Person has no current plans or proposals which relate to or would result in any of the matters described in paragraphs (a) though (j) of Item 4 of Schedule 13D. Mr. Yong may in the future acquire additional shares of Common Stock or other Issuer securities or dispose of some or all of the shares of Common Stock or other securities held by the Reporting Person in open-market transactions or privately negotiated transactions, on such terms and at such times as the Reporting Person may deem advisable subject to applicable securities law and regulations.Item 4 of the SCHEDULE 13D/A filed 2026-01-29
Horowitz Richard M
Mr. Horowitz holds the shares of Company Common Stock beneficially owned and deemed to be beneficially owned by him for investment. The Reporting Person has no current plans or proposals which relate to or would result in any of the matters described in paragraphs (a) though (j) of Item 4 of Schedule 13D. Mr. Horowitz may in the future acquire additional shares of Common Stock or other Issuer securities or dispose of some or all of the shares of Common Stock or other securities held by the Reporting Person in open-market transactions or privately negotiated transactions, on such terms and at such times as the Reporting Person may deem advisable subject to applicable securities law and regulations.Item 4 of the SCHEDULE 13D/A filed 2026-06-25
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-01-21 | Zeff Capital, LP | 5.9% | SCHEDULE 13G/A |
| 2026-01-29 | Yong Siew Wai | 16.9% | SCHEDULE 13D/A |
| 2026-05-01 | Zeff Capital, LP | 1.28% | SCHEDULE 13G/A |
| 2026-06-25 | Horowitz Richard M | 8.6% | SCHEDULE 13D/A |
Questions about who owns Trio-Tech International
Who owns Trio-Tech International?
On this page, 2 holders' latest ownership filings report 5% or more of Trio-Tech International: Yong Siew Wai (16.9%, Schedule 13D/A, filed 2026-01-29) and Horowitz Richard M (8.6%, Schedule 13D/A, filed 2026-06-25).
Who are the largest shareholders of Trio-Tech International?
By the share each holder's latest filing reports, the largest holders of Trio-Tech International on this page are Yong Siew Wai (16.9%) and Horowitz Richard M (8.6%).
When did Yong Siew Wai buy into Trio-Tech International?
The filings give report dates, not purchase dates. The earliest filing from Yong Siew Wai on this page is the Schedule 13D/A, filed 2026-01-29, reporting 16.9%. That earliest filing is itself an amendment, which updates an earlier report.
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%); 4 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.
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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.