Trio-Tech International (TRT)
Nasdaq: TRT · Special Industry Machinery, NEC · Van Nuys, CA · filing with the SEC since 1995
Grade4.3
◀ Past 3.0● Present 5.1▶ Future 4.5
Who owns Trio-Tech International
As filed with the SECHolders of 5% or more
2
Yong Siew Wai holds 16.9% of Common Stock, no par value, as its SCHEDULE 13D/A filed Jan 29, 2026 says.
Directors and officers
6
report now, of 8 people on the record since 2006. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 2 named at left.
Holders of 5% or moreshare of the class, as filed
Yong Siew Wai
SCHEDULE 13D/A · filed Jan 29, 2026 · Common Stock, no par value
Horowitz Richard M
SCHEDULE 13D/A · filed Jun 25, 2026 · Common Stock, no par value
Zeff Capital, LP
SCHEDULE 13G/A · filed May 1, 2026 · Common Stock · reported falling below 5%, from 5.9% in Jan 21, 2026
What TRT reports owning in othersstakes of 5% or more, and other ties
13 subsidiaries in 5 countries, from the list filed with the 10-K filed Sep 24, 2026.
Insider tradesForm 4
30sales
0purchases
0sales on a scheduled plan
3people selling
$3.0Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Nov 12, 2025 to Nov 12, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Nov 12, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window3 of 8 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Horowitz Richard M | director | 2 | $1.3M | 0 | 0 | $0 |
| Adelman Jason T | director | 12 | $1.1M | 0 | 0 | $0 |
| Ting Victor Hock Ming | VICE PRESIDENT, CFO | 16 | $700,000 | 0 | 0 | $0 |