SEC Form 4
Trio-Tech International (TRT) insider trading
In the 12 months to Oct 26, 2026, 3 TRT insiders reported open-market sales of $3.0M across 13 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $3.0M
- 13 filings · 3 insiders
- Open-market purchases
- $0
- 0 filings
Who traded TRT, and when
- Sale
TRT daily close from Oct 27, 2025 to Oct 26, 2026, between $3.27 and $20.05, last $5.10. 13 sale and 0 purchase filings by 3 insiders, marked at their filing dates. Richard M. Horowitz, Director: sold $1.3M across 2 filings, first filed Jan 9, 2026, last May 27, 2026. Jason T. Adelman, Director: sold $1.1M across 3 filings, first filed May 15, 2026, last Jun 23, 2026. Hock Ming Ting, Director: sold $656.6K across 8 filings, first filed Jan 9, 2026, last May 28, 2026.
Largest mark · tap a row for others
Richard M. Horowitz · Director
Sale $1,221,770
67,500 shares at $18.10 avg
Filed May 27, 2026 · traded May 18
Close on filing date $14.13
Richard M. Horowitz · Director
Director
$1.3M soldJason T. Adelman · Director
Director
$1.1M soldHock Ming Ting · Director
Director
$656.6K soldOpen-market trades
13 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Richard M. Horowitz | Director | $1.3M | — | 2 | — | |
| Jason T. Adelman | Director | $1.1M | — | 3 | — | |
| Hock Ming Ting | Director | $656.6K | — | 8 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Jason T. Adelman Director | Sale | 10,000 | $15.36 | $153.6K | 140,094 | |
traded | Hock Ming Ting Director | Sale | 17,200 | $16.65 | $286.4K | 131,044 | |
traded | Richard M. Horowitz Director | Sale | 67,500 | $18.10 | $1.2M | 664,784 | |
traded | Jason T. Adelman Director | Sale | 49,975 | $16.37 | $818.3K | 45,617 | |
traded | Jason T. Adelman Director | Sale | 22,000 | $5.62 | $123.6K | 50,000 | |
traded | Hock Ming Ting Director | Sale | 5,800 | $7.10 | $41.2K | 148,244 | |
traded | Hock Ming Ting Director | Sale | 7,000 | $7.02 | $49.1K | 154,044 | |
traded | Hock Ming Ting Director | Sale | 18,600 | $6.87 | $127.7K | 161,044 | |
traded | Hock Ming Ting Director | Sale | 4,000 | $6.78 | $27.1K | 179,644 | |
traded | Hock Ming Ting Director | Sale | 6,070 | $6.77 | $41.1K | 183,644 | |
traded | Hock Ming Ting Director | Sale | 5,000 | $7.08 | $35.4K | 189,714 | |
traded | Richard M. Horowitz Director | Sale | 7,500 | $7.50 | $56.3K | 621,500 | |
traded | Hock Ming Ting Director | Sale | 6,600 | $7.37 | $48.6K | 194,714 |
GET /stocks/filings/vX/form-4?tickers=TRT&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"TRT"
],
"issuer_cik": "0000732026",
"owner_cik": "0001247604",
"accession_number": "0001247604-26-000009",
"form_type": "4",
"filing_date": "2026-06-23",
"period_of_report": "2026-06-18",
"issuer_name": "TRIO-TECH INTERNATIONAL",
"issuer_trading_symbol": "TRT",
"owner_name": "ADELMAN JASON T",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-06-18",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 5000,
"transaction_price_per_share": 15.84,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 145094,
"transaction_value": 79200,
"direct_or_indirect": "D"
},
{
"tickers": [
"TRT"
],
"issuer_cik": "0000732026",
"owner_cik": "0001247604",
"accession_number": "0001247604-26-000009",
"form_type": "4",
"filing_date": "2026-06-23",
"period_of_report": "2026-06-18",
"issuer_name": "TRIO-TECH INTERNATIONAL",
"issuer_trading_symbol": "TRT",
"owner_name": "ADELMAN JASON T",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-06-19",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 5000,
"transaction_price_per_share": 14.88,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 140094,
"transaction_value": 74400,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 17 records
- Option exercises17 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has Trio-Tech International's CEO sold stock?
No. Siew Wai Yong (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is TRT’s insider data?
These are TRT Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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Track TRT insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for TRT every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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