SEC Form 4
M-tron Industries, Inc. (MPTI) insider trading
In the 12 months to Oct 23, 2026, one MPTI insider reported open-market sales of $0 across 1 filing; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $0
- 1 filing · 1 insider
- Open-market purchases
- $0
- 0 filings
$ excludes 1 trade without a price.
Who traded MPTI, and when
- Sale
MPTI daily close from Oct 23, 2025 to Oct 23, 2026, between $43.64 and $100.75, last $65.28. 1 sale and 0 purchase filings by 1 insider, marked at their filing dates. Linda M. Biles, Executive VP - Finance: across 1 filing, first filed Apr 16, 2026, last Apr 16, 2026.
Largest mark · tap a row for others
Linda M. Biles · Executive VP - Finance
Sale unpriced
720 shares
Filed Apr 16, 2026 · traded Apr 14
Close on filing date $65.62
Linda M. Biles · Executive VP - Finance
Executive VP - Finance
Has M-tron Industries, Inc.'s CEO sold stock?
No. Cameron Pforr (CEO) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
1 filing in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Linda M. Biles | Executive VP - Finance | — | — | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Linda M. Biles Executive VP - Finance | Sale | 720 | — | — | 28,682 |
GET /stocks/filings/vX/form-4?tickers=MPTI&filing_date.gte=2025-10-23&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"MPTI",
"MPTIr"
],
"issuer_cik": "0001902314",
"owner_cik": "0001823023",
"accession_number": "0001437749-26-012495",
"form_type": "4",
"filing_date": "2026-04-16",
"period_of_report": "2026-04-14",
"issuer_name": "M-tron Industries, Inc.",
"issuer_trading_symbol": "MPTI",
"owner_name": "Biles Linda M",
"is_officer": true,
"officer_title": "Executive VP - Finance",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-04-14",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 720,
"transaction_price_per_share": 0,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 28682,
"transaction_value": 0,
"direct_or_indirect": "D"
}
]
}
// trimmed to 1 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) · 35 records
- Option exercises2 records
- Tax withholding1 record
- Tax withholding (sold to cover)4 records
- Grants and awards13 records
- Other15 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
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 MPTI 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.
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.