Who owns Trio-Tech International (TRT)?
Trio-Tech International's largest shareholders, according to SEC filings, are Siew Wai Yong (12.6%, CHAIRMAN AND CEO), Richard M. Horowitz (6.4%, director) and Renaissance Technologies (3.4%). In all, 32 holders named in SEC filings declare between 38.0% and 45.9% of its shares, and 8 smaller fund managers another 0.11%.
Trio-Tech International's largest shareholders
| Holder | Filing | Shares | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|---|
| Siew Wai Yong | Form 4 | 1.3M | 12.6% | Sep 28, 2026 | — |
| Richard M. Horowitz | Form 4 | 664,784 | 6.4% | May 18, 2026 | — |
| Renaissance Technologies | 13F | 356,859 | 3.4% | Jun 30, 2026 | Q4 2019 or earlier |
| Vanguard | 13F | 348,926 | 3.4% | Jun 30, 2026 | Q4 2019 or earlier |
| Compound Planning, Inc. | 13F | 334,899 | 3.2% | Jun 30, 2026 | Q2 2025 |
| Hwee Poh Lim | Form 4 | 231,268 | 2.2% | Apr 29, 2026 | — |
| Jason T. Adelman | Form 4 | 210,094 | 2.0% | Jun 23, 2026 | — |
| Dimensional | 13F | 190,139 | 1.8% | Jun 30, 2026 | Q4 2019 or earlier |
| Jane Street | 13F | 188,745 | 1.8% | Jun 30, 2026 | Q1 2026 |
| Hock Ming Ting | Form 4 | 131,044 | 1.3% | May 26, 2026 | — |
| Huntleigh Advisors, Inc. | 13F | 113,110 | 1.1% | Jun 30, 2026 | Q2 2026 |
| Geode Capital | 13F | 70,605 | 0.68% | Jun 30, 2026 | Q1 2022 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 13F | 64,700 | 0.62% | Jun 30, 2026 | Q4 2019 or earlier |
| BlackRock | 13F | 57,025 | 0.55% | Jun 30, 2026 | Q2 2026 |
| Informed Momentum Co LLC | 13F | 54,854 | 0.53% | Jun 30, 2026 | Q2 2026 |
| STONEBRIDGE CAPITAL MANAGEMENT INC | 13F | 46,000 | 0.44% | Jun 30, 2026 | Q3 2020 |
| Anitha Srinivasan | Form 4 | 40,022 | 0.39% | Sep 28, 2026 | — |
| UBS | 13F | 38,373 | 0.37% | Jun 30, 2026 | Q3 2025 |
| SEI INVESTMENTS CO | 13F | 32,489 | 0.31% | Jun 30, 2026 | Q2 2026 |
| State Street | 13F | 31,016 | 0.30% | Jun 30, 2026 | Q1 2026 |
| CORSAIR CAPITAL MANAGEMENT, L.P. | 13F | 30,970 | 0.30% | Jun 30, 2026 | Q2 2026 |
| JAMES INVESTMENT RESEARCH, INC. | 13F | 24,016 | 0.23% | Jun 30, 2026 | Q2 2024 |
| NewEdge Advisors, LLC | 13F | 24,016 | 0.23% | Jun 30, 2026 | Q2 2024 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 13F | 22,115 | 0.21% | Jun 30, 2026 | Q4 2025 |
| ROYAL BANK OF CANADA | 13F | 21,540 | 0.21% | Jun 30, 2026 | Q2 2026 |
Trio-Tech International ownership breakdown
32 holders named in SEC filings declare between 38.0% and 45.9% of Trio-Tech International's shares outstanding, as of Sep 28, 2026. The largest are Siew Wai Yong (12.6%), Richard M. Horowitz (6.4%) and Renaissance Technologies (3.4%); the five largest hold 29.0% together. Another 8 institutions hold small positions worth 0.11%. At least 54.0% of the shares appear in no ownership filing: investors who do not have to report, mostly individuals. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 6.9% and sold 6.4% of the shares, a net purchase of 0.51%; 13 opened a position, 10 added, 6 reduced and 4 sold out. Biggest buyers: Jane Street (+169,073 shares) and Huntleigh Advisors, Inc. (+113,110 shares). Biggest sellers: Compound Planning, Inc. (-286,601) and BRIDGEWAY CAPITAL MANAGEMENT, LLC (-77,382). Directors and officers, from their latest Form 4: Siew Wai Yong (12.6%), Richard M. Horowitz (6.4%) and Hwee Poh Lim (2.2%). Over time, 32 managers declared Trio-Tech International in their 13F for Q2 2026, against 10 for Q4 2019: together at most 21.3% of the shares outstanding, against 21.3%.
Trio-Tech International institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 10 | 21.3% | $3.1M | 94.7% |
| Q4 2020 | 12 | 20.6% | $3.0M | 97.1% |
| Q4 2021 | 15 | 20.8% | $10.9M | 77.9% |
| Q4 2022 | 17 | 15.1% | $2.8M | 73.0% |
| Q4 2023 | 17 | 16.3% | $3.4M | 75.2% |
| Q4 2024 | 18 | 16.8% | $4.2M | 71.2% |
| Q4 2025 | 17 | 22.1% | $12.7M | 80.6% |
| Q2 2026 | 32 | 21.3% | $26.6M | 62.3% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.
Questions about Trio-Tech International's shareholders
Who is the largest shareholder of Trio-Tech International?
Siew Wai Yong, with 12.6% of Trio-Tech International's shares (1.3 million shares), according to the latest Form 4, dated Sep 28, 2026.
What is Trio-Tech International's institutional ownership?
In their 13F filings for Q2 2026, 32 fund managers declared Trio-Tech International shares: at most 21.3% of the shares outstanding — an upper bound, since two managers can report the same shares. With large shareholders (Schedule 13D/G) and directors and officers (Form 4), 32 named holders declare between 38.0% and 45.9% of the shares.
How much of Trio-Tech International does Renaissance Technologies own?
Renaissance Technologies declared 356,859 shares, 3.4% of Trio-Tech International's shares, in its 13F filing for the quarter ended Jun 30, 2026, up 0.30 percentage points from its previous filing (Mar 31, 2026).
How much of Trio-Tech International does Vanguard own?
Vanguard declared 348,926 shares, 3.4% of Trio-Tech International's shares, in its 13F filing for the quarter ended Jun 30, 2026, up 0.55 percentage points from its previous filing (Mar 31, 2026).
How much Trio-Tech International stock does Siew Wai Yong own?
Siew Wai Yong, CHAIRMAN AND CEO, declared 1.3 million shares, 12.6% of Trio-Tech International's shares, in the latest Form 4, dated Sep 28, 2026.
Who bought and sold Trio-Tech International stock last quarter?
From Mar 31, 2026 to Jun 30, 2026, fund managers that filed both quarters bought 6.9% of Trio-Tech International's shares and sold 6.4%: 13 opened a position and 4 sold out. Biggest buyers: Jane Street (+169,073 shares), Huntleigh Advisors, Inc. (+113,110 shares) and Vanguard (+60,491 shares). Biggest sellers: Compound Planning, Inc. (−286,601 shares), BRIDGEWAY CAPITAL MANAGEMENT, LLC (−77,382 shares) and ACADIAN ASSET MANAGEMENT LLC (−71,546 shares).
How much of Trio-Tech International do individual investors own?
No filing says it directly: individual investors do not have to report their holdings. At least 54.0% of Trio-Tech International's shares appear in no ownership filing — retail investors, holders below the reporting thresholds and foreign funds.
Who owns the other AI companies? The largest shareholder of each, from SEC filings.