TDG insider buying and SEC filings, explained
TransDigm Group INC · CIK 1260221
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$3.8M
Insiders who bought
1
Sold (not marked 10b5-1)
$121.5M
Planned sales (10b5-1)
$319.7M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 15, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 4,100 shares at about $1,128.04 ($4.6M), marked as a 10b5-1 plan trade. Holdings down 53% to 3,600 shares. | SEC filing Filed Oct 16, 2026, 4:19 PM ET |
| Sep 15, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,094.58 ($4.3M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Sep 16, 2026 |
| Aug 18, 2026 | Planned (10b5-1) | W Nicholas Howley (Director) sold 10,132 shares indirectly (by trust) at about $1,236.27 ($12.5M), marked as a 10b5-1 plan trade. Holdings by trust down 32% to 21,548 shares. | SEC filing Filed Aug 19, 2026 |
| Aug 17, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,238.76 ($4.8M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Aug 18, 2026 |
| Jul 20, 2026 | Planned (10b5-1) | W Nicholas Howley (Director) sold 10,132 shares indirectly (by trust) at about $1,216.08 ($12.3M), marked as a 10b5-1 plan trade. Holdings by trust down 32% to 21,548 shares. | SEC filing Filed Jul 21, 2026 |
| Jul 15, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 414 shares at about $1,231.11 ($510K), marked as a 10b5-1 plan trade. Holdings down 10% to 3,600 shares. | SEC filing Filed Jul 17, 2026 |
| Jul 15, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,486 shares at about $1,216.21 ($4.2M), marked as a 10b5-1 plan trade. Holdings down 46% to 4,014 shares. | SEC filing Filed Jul 17, 2026 |
| May 18, 2026 | Planned (10b5-1) | W Nicholas Howley (Director) sold 10,132 shares indirectly (by trust) at about $1,180.82 ($12.0M), marked as a 10b5-1 plan trade. Holdings by trust down 32% to 21,548 shares. | SEC filing Filed May 19, 2026 |
| May 15, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,154.09 ($4.5M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed May 18, 2026 |
| Apr 20, 2026 | Planned (10b5-1) | W Nicholas Howley (Director) sold 10,132 shares indirectly (by trust) at about $1,265.06 ($12.8M), marked as a 10b5-1 plan trade. Holdings by trust down 32% to 21,548 shares. | SEC filing Filed Apr 21, 2026 |
| Apr 15, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,280.46 ($5.0M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Apr 16, 2026 |
| Mar 18, 2026 | Planned (10b5-1) | W Nicholas Howley (Director) sold 10,132 shares indirectly (by trust) at about $1,213.05 ($12.3M), marked as a 10b5-1 plan trade. Holdings by trust down 32% to 21,548 shares. | SEC filing Filed Mar 19, 2026 |
| Mar 16, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,243.70 ($4.9M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Mar 17, 2026 |
| Feb 25, 2026 | Purchase (code P) | Robert J. Small (Director) bought 1 shares indirectly (by entity) at $1,285.00 ($1K), reported as a purchase (code P). Holdings by entity up <1% to 366,142 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 27, 2026 |
| Feb 18, 2026 | Planned (10b5-1) | W Nicholas Howley (Director) sold 10,168 shares indirectly (by trust) at about $1,307.68 ($13.3M), marked as a 10b5-1 plan trade. Holdings by trust down 32% to 21,548 shares. | SEC filing Filed Feb 20, 2026 |
| Feb 17, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,293.88 ($5.0M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Feb 18, 2026 |
| Feb 6, 2026 | Purchase (code P) | Michael Lisman (CEO and Director) bought 950 shares at $1,284.26 ($1.2M), reported as a purchase (code P). Holdings up 41% to 3,259 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 9, 2026 |
| Feb 2, 2026 | Planned (10b5-1) | Kevin M Stein (Director) sold 11,075 shares indirectly (by trust) at about $1,434.49 ($15.9M), marked as a 10b5-1 plan trade. Holdings by trust down 58% to 8,158 shares. | SEC filing Filed Feb 3, 2026 |
| Feb 2, 2026 | Planned (10b5-1) | Kevin M Stein (Director) sold 36,925 shares indirectly (by trust) at about $1,425.78 ($52.6M), marked as a 10b5-1 plan trade. Holdings by trust down 66% to 19,233 shares. | SEC filing Filed Feb 3, 2026 |
| Feb 2, 2026 | Planned (10b5-1) | Patrick Joseph Murphy (President / COO) sold 290 shares at $1,430.10 ($415K), marked as a 10b5-1 plan trade. Holdings down 22% to 1,055 shares. | SEC filing Filed Feb 3, 2026 |
| Jan 15, 2026 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,429.92 ($5.6M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Jan 16, 2026 |
| Jan 14, 2026 | Planned (10b5-1) | Kevin M Stein (Director) sold 7,627 shares indirectly (by trust) at about $1,406.38 ($10.7M), marked as a 10b5-1 plan trade. Holdings by trust down 48% to 8,158 shares. | SEC filing Filed Jan 16, 2026 |
| Jan 8, 2026 | Planned (10b5-1) | Kevin M Stein (Director) sold 17,373 shares indirectly (by trust) at about $1,407.25 ($24.4M), marked as a 10b5-1 plan trade. Holdings by trust down 68% to 8,158 shares. | SEC filing Filed Jan 9, 2026 |
| Jan 5, 2026 | Planned (10b5-1) | Kevin M Stein (Director) sold 25,000 shares indirectly (by trust) at about $1,373.59 ($34.3M), marked as a 10b5-1 plan trade. Holdings by trust down 75% to 8,158 shares. | SEC filing Filed Jan 6, 2026 |
| Jan 2, 2026 | Planned (10b5-1) | Patrick Joseph Murphy (President / COO) sold 290 shares at $1,329.03 ($385K), marked as a 10b5-1 plan trade. Holdings down 22% to 1,055 shares. | SEC filing Filed Jan 5, 2026 |
| Dec 15, 2025 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,290.52 ($5.0M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Dec 16, 2025 |
| Dec 9, 2025 | Sale | Robert J. Small (Director) sold 90,953 shares indirectly (by entity) at $1,335.72 ($121.5M). Holdings by entity down 17% to 366,141 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 9, 2025 |
| Dec 4, 2025 | Planned (10b5-1) | Kevin M Stein (Director) sold 17,526 shares indirectly (by trust) at about $1,362.29 ($23.9M), marked as a 10b5-1 plan trade. Holdings by trust down 68% to 8,158 shares. | SEC filing Filed Dec 5, 2025 |
| Dec 1, 2025 | Planned (10b5-1) | Patrick Joseph Murphy (President / COO) sold 290 shares at $1,351.06 ($392K), marked as a 10b5-1 plan trade. Holdings down 22% to 1,055 shares. | SEC filing Filed Dec 2, 2025 |
| Nov 28, 2025 | Planned (10b5-1) | Kevin M Stein (Director) sold 4,592 shares indirectly (by trust) at about $1,360.73 ($6.2M), marked as a 10b5-1 plan trade. Holdings by trust down 36% to 8,158 shares. | SEC filing Filed Dec 1, 2025 |
| Nov 25–26, 2025 | Planned (10b5-1) | Kevin M Stein (Director) sold 4,217 shares indirectly (by trust) between Nov 25, 2025 and Nov 26, 2025 at about $1,360.57 ($5.7M), marked as a 10b5-1 plan trade. Holdings by trust down 34% to 8,158 shares. | SEC filing Filed Nov 26, 2025 |
| Nov 21, 2025 | Planned (10b5-1) | Kevin M Stein (Director) sold 230 shares indirectly (by trust) at $1,360.31 ($313K), marked as a 10b5-1 plan trade. Holdings by trust down 3% to 8,158 shares. | SEC filing Filed Nov 24, 2025 |
| Nov 20, 2025 | Planned (10b5-1) | Kevin M Stein (Director) sold 1,104 shares indirectly (by trust) at about $1,360.89 ($1.5M), marked as a 10b5-1 plan trade. Holdings by trust down 12% to 8,158 shares. | SEC filing Filed Nov 21, 2025 |
| Nov 18, 2025 | Planned (10b5-1) | Kevin M Stein (Director) sold 7,191 shares indirectly (by trust) at about $1,361.57 ($9.8M), marked as a 10b5-1 plan trade. Holdings by trust down 47% to 8,158 shares. | SEC filing Filed Nov 19, 2025 |
| Nov 17, 2025 | Planned (10b5-1) | Joel Reiss (President / COO) sold 3,900 shares at about $1,340.00 ($5.2M), marked as a 10b5-1 plan trade. Holdings down 52% to 3,600 shares. | SEC filing Filed Nov 18, 2025 |
| Nov 17, 2025 | Planned (10b5-1) | W Nicholas Howley (Director) sold 2,736 shares indirectly (by trust) at about $1,334.92 ($3.7M), marked as a 10b5-1 plan trade. Holdings by trust down 11% to 21,548 shares. | SEC filing Filed Nov 17, 2025 |
| Nov 14, 2025 | Purchase (code P) | Michael Lisman (CEO and Director) bought 1,954 shares indirectly (by trust) at about $1,339.14 ($2.6M), reported as a purchase (code P). New position of 1,954 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 17, 2025 |
| Nov 3, 2025 | Planned (10b5-1) | Patrick Joseph Murphy (President / COO) sold 290 shares at $1,310.00 ($380K), marked as a 10b5-1 plan trade. Holdings down 22% to 1,055 shares. | SEC filing Filed Nov 4, 2025 |
79 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
Follow TDG in the Insider Ledger app
Get the appA plain-English brief of insider purchases, 8-Ks and red flags at the companies you pick. No account needed.