Comparable stake leader
Siew Wai Yong
SEC ownership of TRIO-TECH INTERNATIONAL
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000732026.
Disclosed value leader
Siew Wai Yong
Comparable rows
3/44
Latest evidence
28 Sep 2026
- Public ticker
- TRT on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Siew Wai Yong
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
3 of 44
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Siew Wai Yong
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
28 Sep 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000732026
- Issuer location
- Van Nuys, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of TRIO-TECH INTERNATIONAL (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Siew Wai Yong
Disclosed value leader
Siew Wai Yong
Comparable rows
3/44
Latest evidence
28 Sep 2026
13D/G
3/4/5
13F
Lead comparable stake: 17%
41 rows are not safely comparable across share classes.
13D/G row: Siew Wai Yong
Showing 1-8 of 44 holder rows.
Quick read
Siew Wai Yong leads the comparable SEC ownership view at 17%.
3 of 44 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Siew Wai Yong's linked filing trail.
Comparable ownership
Top 3
Siew Wai Yong
17%
Richard M. Horowitz
8.6%
Zeff Capital, LP
1.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 44 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Siew Wai Yong |
13D/G
3/4/5
YONG SIEW WAI · CHAIRMAN AND CEO, Director, 10%+ Owner
|
17%
Reported 13D/G
· 27 Jan 2026
|
$18,937,335
1,470,290 shares
|
$0 | 27 Jan 2026 |
| Richard M. Horowitz |
3/4/5
13D/G
Director, 10%+ Owner · HOROWITZ RICHARD M
|
8.6%
Reported 13D/G
· 16 Dec 2025
|
$12,121,339
664,784 shares
mixed-class rows
|
-$1,278,048 | 18 May 2026 |
| Zeff Capital, LP |
13D/G
|
1.3%
Reported 13D/G
· 22 Apr 2026
|
$739,008
127,856 shares
|
-$2,215,584 | 22 Apr 2026 |
| A. Charles Wilson |
3/4/5
10%+ Owner
|
—
denominator unverified
|
$1,961,928
435,500 shares
|
— | 14 Mar 2024 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
—
denominator unverified
|
$4,396,503
356,859 shares
|
— | 30 Jun 2026 |
| Compound Planning, Inc. |
13F
Company
|
—
denominator unverified
|
$4,125,956
334,899 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$3,788,141
307,479 shares
|
— | 30 Jun 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
—
denominator unverified
|
$2,341,707
190,139 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$2,932,898.
Buys
$48,612
Insiders: 1
Sells
$2,981,510
Insiders: 3
Net
-$2,932,898
Shares: -214,045
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 6,600
Shares: 220,645
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 144,675 | $0 | $2,480,075 | -$2,480,075 |
| 6-9 | 0 | 57,400 | $0 | $368,682 | -$368,682 |
| 9-12 | 6,600 | 18,570 | $48,612 | $132,752 | -$84,140 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-8 of 8 reporting-owner rows connected to TRIO-TECH INTERNATIONAL. Open a relationship link for the CIK-to-CIK filing trail.
Rows
8
Largest Forms 3/4/5 holder
Siew Wai Yong
Net 12M change
-$2.93M
Full value: -$2,932,898 · USD · 12-month changeLatest report
28 Sep 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Siew Wai Yong | CHAIRMAN AND CEO, Director, 10%+ Owner | $16,243,443 | Mixed | 28 Sep 2026 | ||
| Richard M. Horowitz | Director, 10%+ Owner | $12,121,339 | -$1,278,048 | -9.5% | Mixed | 18 May 2026 |
| Hock Ming Ting | Director | $2,257,782 | -$559,355 | -20% | Mixed | 26 May 2026 |
| A. Charles Wilson | 10%+ Owner | $1,961,928 | Mixed | 14 Mar 2024 | ||
| Hwee Poh Lim | Sr Corp Vp And Coo (Testing) | $1,369,529 | Mixed | 07 Jul 2026 | ||
| Adelman Jason T. | Director | $1,302,893 | -$1,095,495 | -46% | Mixed | 18 Jun 2026 |
| Srinivasan Anitha | Chief Financial Officer | $525,871 | Mixed | 28 Sep 2026 | ||
| Soon Siew Kuan | Corporate Vice President | $93,623 | Mixed | 13 Dec 2023 |
Recent insider transactions for TRIO-TECH INTERNATIONAL
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Siew Wai Yong | TRT | TRT Common Stock | Options Exercise | 3.97% | 50,000 | 1,310,247 | 28 Sep 2026 | Direct | ||
| Siew Wai Yong | TRT | TRT Common Stock (Right to buy) | Options Exercise | -100% | -50,000 | 0 | 28 Sep 2026 | Direct | ||
| Srinivasan Anitha | TRT | TRT Common Stock | Options Exercise | 25% | 8,005 | 40,022 | 28 Sep 2026 | Direct | ||
| Srinivasan Anitha | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -8,005 | 0 | 28 Sep 2026 | Direct | ||
| Srinivasan Anitha | TRT | TRT Common Stock | Options Exercise | 23.1% | 6,002 | 32,017 | 27 Jul 2026 | Direct | ||
| Srinivasan Anitha | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -6,002 | 0 | 27 Jul 2026 | Direct | ||
| Hwee Poh Lim | TRT | Common Stock (Right to Buy) | Award | 5,000 | 5,000 | 07 Jul 2026 | Direct | |||
| Srinivasan Anitha | TRT | Common Stock (Right to Buy) | Award | 5,000 | 5,000 | 07 Jul 2026 | Direct | |||
| Adelman Jason T. | TRT | Common Stock | Options Exercise | 50% | 70,000 | 210,094 | 23 Jun 2026 | Direct | ||
| Adelman Jason T. | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -70,000 | 0 | 23 Jun 2026 | Direct | ||
| Adelman Jason T. | TRT | Common Stock | Sale | -3.45% | -$74,400 | $14.88 | -5,000 | 140,094 | 19 Jun 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Sale | -3.33% | -$79,200 | $15.84 | -5,000 | 145,094 | 18 Jun 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -70,094 | 0 | 29 May 2026 | Direct | ||
| Adelman Jason T. | TRT | Common Stock | Options Exercise | 275.2% | 110,094 | 150,094 | 28 May 2026 | Direct | ||
| Adelman Jason T. | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -40,000 | 0 | 28 May 2026 | Direct | ||
| Hock Ming Ting | TRT | TRT Common Stock | Sale | -11.6% | -$286,380 | $16.65 | -17,200 | 131,044 | 26 May 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Sale | -27.2% | -$209,575 | $14.00 | -14,975 | 40,000 | 19 May 2026 | Direct |
| Richard M. Horowitz | TRT | Common Stock | Sale | -9.22% | -$1,221,770 | $18.10 | -67,500 | 664,784 | 18 May 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Sale | -38.9% | -$608,750 | $17.39 | -35,000 | 54,975 | 18 May 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Options Exercise | 79.4% | 39,750 | 89,795 | 18 May 2026 | Direct | ||
| Adelman Jason T. | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -39,750 | 0 | 18 May 2026 | Direct | ||
| Hwee Poh Lim | TRT | TRT Common Stock | Options Exercise | 34.9% | 59,802 | 231,268 | 29 Apr 2026 | Direct | ||
| Hwee Poh Lim | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -59,802 | 0 | 29 Apr 2026 | Direct | ||
| Hock Ming Ting | TRT | TRT Common Stock | Sale | -1.33% | -$14,260 | $7.13 | -2,000 | 148,244 | 20 Apr 2026 | Direct |
| Hock Ming Ting | TRT | TRT Common Stock | Sale | -2.47% | -$26,904 | $7.08 | -3,800 | 150,244 | 17 Apr 2026 | Direct |
| Hock Ming Ting | TRT | Common Stock | Sale | -2.53% | -$28,160 | $7.04 | -4,000 | 154,044 | 16 Apr 2026 | Direct |
| Hock Ming Ting | TRT | Common Stock | Sale | -1.86% | -$20,970 | $6.99 | -3,000 | 158,044 | 15 Apr 2026 | Direct |
| Hock Ming Ting | TRT | Common Stock | Sale | -7.26% | -$87,318 | $6.93 | -12,600 | 161,044 | 14 Apr 2026 | Direct |
| Hock Ming Ting | TRT | Common Stock | Sale | -3.34% | -$40,380 | $6.73 | -6,000 | 173,644 | 13 Apr 2026 | Direct |
| Hock Ming Ting | TRT | TRT Common Stock | Sale | -2.18% | -$27,120 | $6.78 | -4,000 | 179,644 | 09 Apr 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Sale | -9.09% | -$28,033 | $5.61 | -5,000 | 50,000 | 16 Mar 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Sale | -8.33% | -$29,082 | $5.82 | -5,000 | 55,000 | 10 Mar 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Sale | -11.1% | -$41,431 | $5.53 | -7,489 | 60,000 | 06 Mar 2026 | Direct |
| Adelman Jason T. | TRT | Common Stock | Sale | -6.27% | -$25,025 | $5.55 | -4,511 | 67,489 | 05 Mar 2026 | Direct |
| Anitha Srinivasan | TRT | TRT Common Stock | Options Exercise | 36.9% | 7,015 | 26,015 | 25 Feb 2026 | Direct | ||
| Anitha Srinivasan | TRT | Common Stock (Right to Buy) | Options Exercise | -70% | -7,015 | 3,001 | 25 Feb 2026 | Direct | ||
| Richard M. Horowitz | TRT | TRT Common Stock | Options Exercise | 6.45% | 40,056 | 661,556 | 17 Feb 2026 | Direct | ||
| Richard M. Horowitz | TRT | Common Stock (Right to Buy) | Options Exercise | -100% | -40,056 | 0 | 17 Feb 2026 | Direct | ||
| Siew Wai Yong | TRT | TRT Common Stock | Options Exercise | 6.79% | 80,111 | 1,260,247 | 27 Jan 2026 | Direct | ||
| Siew Wai Yong | TRT | TRT Common Stock (Right to buy) | Options Exercise | -100% | -8,011 | 0 | 27 Jan 2026 | Direct | ||
| Hock Ming Ting | TRT | Common Stock | Sale | -0.04% | -$475 | $6.78 | -70 | 183,644 | 16 Jan 2026 | Direct |
| Hock Ming Ting | TRT | Common Stock | Sale | -1.58% | -$20,700 | $6.90 | -3,000 | 186,714 | 15 Jan 2026 | Direct |
| Hock Ming Ting | TRT | TRT Common Stock | Sale | -2.57% | -$35,410 | $7.08 | -5,000 | 189,714 | 12 Jan 2026 | Direct |
| Siew Wai Yong | TRT | Common Stock (Right to Buy) | Award | 80,000 | 70,000 | 09 Jan 2026 | Direct | |||
| Richard M. Horowitz | TRT | Common Stock (Right to Buy) | Award | 70,000 | 70,000 | 09 Jan 2026 | Direct | |||
| Hock Ming Ting | TRT | Common Stock (Right to Buy) | Award | 600% | 60,000 | 70,000 | 09 Jan 2026 | Direct | ||
| Jason T. Adelman | TRT | Common Stock (Right to Buy) | Award | 70,000 | 70,000 | 09 Jan 2026 | Direct | |||
| Richard M. Horowitz | TRT | Common Stock | Sale | -1.19% | -$56,278 | $7.50 | -7,500 | 621,500 | 07 Jan 2026 | Direct |
| Hock Ming Ting | TRT | TRT Common Stock | Sale | 3.42% | $48,612 | $7.37 | 6,600 | 199,314 | 07 Jan 2026 | Direct |
| Hock Ming Ting | TRT | Common Stock | Sale | -1.61% | -$19,890 | $6.63 | -3,000 | 183,714 | 06 Jan 2026 | Direct |
* marks a reported price that did not pass the local price check.