SEC Form 4
TransDigm Group Incorporated (TDG) insider trading
In the 12 months to Oct 26, 2026, 5 TDG insiders reported open-market sales of $494.0M across 42 filings; 2 insiders bought $3.8M.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $494.0M
- 42 filings · 5 insiders
- Open-market purchases
- $3.8M
- 3 filings
- Pre-arranged sales (10b5-1)
- 36 of 42
- $321.4M of $494.0M sold (65%)
Who traded TDG, and when
- Purchase
- Sale
- Sale, pre-arranged (10b5-1)
TDG daily close from Oct 27, 2025 to Oct 26, 2026, between $1,076.01 and $1,450.00, last $1,123.78. 42 sale and 3 purchase filings by 6 insiders, marked at their filing dates. Kevin M. Stein, Director: sold $186.5M across 12 filings, first filed Oct 28, 2025, last Feb 3, 2026. Robert J. Small, Director: sold $127.6M and bought $1.3K across 3 filings, first filed Dec 9, 2025, last Feb 27, 2026. W. Nicholas Howley, Director: sold $119.0M across 10 filings, first filed Nov 17, 2025, last Aug 19, 2026. Joel Reiss, Co-Chief Operating Officer: sold $58.7M across 13 filings, first filed Nov 18, 2025, last Oct 16, 2026. Michael Lisman, President & CEO: bought $3.8M across 2 filings, first filed Nov 17, 2025, last Feb 9, 2026. Patrick Joseph Murphy, Co-Chief Operating Officer: sold $2.4M across 5 filings, first filed Oct 28, 2025, last Feb 3, 2026.
Largest mark · tap a row for others
Robert J. Small · Director
Filing 1 of 2 within a week · $127,551,620 total
Sale $121,487,741
90,953 shares at $1,335.72 avg
Filed Dec 9, 2025
Close on filing date $1,318.02
Kevin M. Stein · Director
Director
$186.5M soldRobert J. Small · Director
Director
$127.6M sold$1.3K boughtW. Nicholas Howley · Director
Director
$119.0M soldJoel Reiss · Co-Chief Operating Officer
Co-Chief Operating Officer
$58.7M soldMichael Lisman · President & CEO
President & CEO
$3.8M boughtPatrick Joseph Murphy · Co-Chief Operating Officer
Co-Chief Operating Officer
$2.4M soldOpen-market trades
45 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Kevin M. Stein | Director | $186.5M | — | 12 | 100% of sales | |
| Robert J. Small | Director | $127.6M | $1.3K | 3 | — | |
| W. Nicholas Howley | Director | $119.0M | — | 10 | 66% of sales | |
| Joel Reiss | Co-Chief Operating Officer | $58.7M | — | 13 | 92% of sales | |
| Michael Lisman | President & CEO | — | $3.8M | 2 | — | |
| Patrick Joseph Murphy | Co-Chief Operating Officer | $2.4M | — | 5 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 4,100 | $1,128.04 | $4.6M | 7,049 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,094.58 | $4.3M | 6,550 | |
traded | W. Nicholas Howley Director | SalePre-arranged (10b5-1) | 10,132 | $1,236.28 | $12.5M | 29,716 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,238.76 | $4.8M | 3,790 | |
traded | W. Nicholas Howley Director | SalePre-arranged (10b5-1) | 10,132 | $1,216.08 | $12.3M | 27,713 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,486 | $1,216.21 | $4.2M | 6,424 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 414 | $1,231.11 | $509.7K | 3,754 | |
traded | W. Nicholas Howley Director | Sale | 10,132 | $1,319.55 | $13.4M | 23,216 | |
traded | W. Nicholas Howley Director | Sale | 10,132 | $1,319.55 | $13.4M | 22,137 | |
traded | W. Nicholas Howley Director | Sale | 10,132 | $1,319.55 | $13.4M | 22,077 | |
traded | Joel Reiss Co-Chief Operating Officer | Sale | 3,900 | $1,276.78 | $5.0M | 4,292 | |
traded | W. Nicholas Howley Director | SalePre-arranged (10b5-1) | 10,132 | $1,180.82 | $12.0M | 21,680 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,154.09 | $4.5M | 3,647 | |
traded | W. Nicholas Howley Director | SalePre-arranged (10b5-1) | 10,132 | $1,265.06 | $12.8M | 26,225 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,280.46 | $5.0M | 6,171 | |
traded | W. Nicholas Howley Director | SalePre-arranged (10b5-1) | 10,132 | $1,213.05 | $12.3M | 22,405 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,243.70 | $4.9M | 7,350 | |
traded | Robert J. Small Director | Purchase | 1 | $1,285.00 | $1.3K | 366,142 | |
traded | W. Nicholas Howley Director | SalePre-arranged (10b5-1) | 10,168 | $1,307.68 | $13.3M | 29,815 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,293.88 | $5.0M | 5,531 | |
traded | Michael Lisman President & CEO | Purchase | 950 | $1,284.26 | $1.2M | 3,259 | |
traded | Patrick Joseph Murphy Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 290 | $1,430.10 | $414.7K | 1,055 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 36,925 | $1,425.79 | $52.6M | 23,060 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 11,075 | $1,434.49 | $15.9M | 11,893 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 7,627 | $1,406.38 | $10.7M | 9,680 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,429.92 | $5.6M | 3,600 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 17,373 | $1,407.25 | $24.4M | 8,498 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 25,000 | $1,373.59 | $34.3M | 10,599 | |
traded | Patrick Joseph Murphy Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 290 | $1,329.03 | $385.4K | 1,055 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,290.52 | $5.0M | 3,947 | |
traded | Robert J. Small Director | Sale | 4,700 | $1,290.19 | $6.1M | 5,699 | |
traded | Robert J. Small Director | Sale | 90,953 | $1,335.72 | $121.5M | Multiple accounts | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 17,526 | $1,362.29 | $23.9M | 18,774 | |
traded | Patrick Joseph Murphy Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 290 | $1,351.06 | $391.8K | 1,055 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 4,592 | $1,360.73 | $6.2M | 8,158 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 4,217 | $1,360.57 | $5.7M | 8,158 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 230 | $1,360.31 | $312.9K | 8,158 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 1,104 | $1,360.89 | $1.5M | 8,607 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 7,191 | $1,361.57 | $9.8M | 8,228 | |
traded | Joel Reiss Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 3,900 | $1,340.00 | $5.2M | 6,463 | |
traded | W. Nicholas Howley Director | SalePre-arranged (10b5-1) | 2,736 | $1,334.92 | $3.7M | 21,964 | |
traded | Michael Lisman President & CEO | Purchase | 1,954 | $1,339.14 | $2.6M | 1,850 | |
traded | Patrick Joseph Murphy Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 290 | $1,310.00 | $379.9K | 1,055 | |
traded | Patrick Joseph Murphy Co-Chief Operating Officer | SalePre-arranged (10b5-1) | 580 | $1,354.76 | $785.8K | 1,055 | |
traded | Kevin M. Stein Director | SalePre-arranged (10b5-1) | 700 | $1,360.00 | $952.0K | 8,158 |
GET /stocks/filings/vX/form-4?tickers=TDG&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"TDG"
],
"issuer_cik": "0001260221",
"owner_cik": "0001656109",
"accession_number": "0001656109-26-000009",
"form_type": "4",
"filing_date": "2026-10-16",
"period_of_report": "2026-10-15",
"issuer_name": "TransDigm Group INC",
"issuer_trading_symbol": "TDG",
"owner_name": "Reiss Joel",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Co-Chief Operating Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-15",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 438,
"transaction_price_per_share": 1135.9542,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 3600,
"transaction_value": 497547.9396,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F21",
"description": "Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,135.5100 - $1,136.2400. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price."
}
]
},
{
"tickers": [
"TDG"
],
"issuer_cik": "0001260221",
"owner_cik": "0001656109",
"accession_number": "0001656109-26-000009",
"form_type": "4",
"filing_date": "2026-10-16",
"period_of_report": "2026-10-15",
"issuer_name": "TransDigm Group INC",
"issuer_trading_symbol": "TDG",
"owner_name": "Reiss Joel",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Co-Chief Operating Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-15",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 60,
"transaction_price_per_share": 1117.11,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 7370,
"transaction_value": 67026.59999999999,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F5",
"description": "Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $1,116.7500 - $1,117.6800. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price."
}
]
}
]
}
// 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) · 67 records
- Option exercises46 records
- Grants and awards18 records
- Gifts1 record
- Other2 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.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- 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 TransDigm Group Incorporated's CEO sold stock?
No. Michael Lisman (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is TDG’s insider data?
These are TDG 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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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 TDG 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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