TransDigm insider activity
What the executives and directors of TransDigm actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$470M
net open-market flow, 12 m
8 open-market buys, 12 m
69.2%
of sale value on 10b5-1 plans, 12 m
208 days since an insider bought, whole record
The tape: three years of insider trades
Open-market buy
Discretionary sale
Planned sale (10b5-1)
Reported-price path
Routine
Every marker sits at the price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling.
The 159 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Sep 15, 2026 | Reiss Joel | 3,900 |
| Aug 18, 2026 | Howley W Nicholas | 10K |
| Aug 17, 2026 | Reiss Joel | 3,900 |
| Jul 20, 2026 | Howley W Nicholas | 10K |
| Jul 15, 2026 | Reiss Joel | 3,900 |
| Jun 18, 2026 | Howley W Nicholas | 10K |
| Jun 15, 2026 | Reiss Joel | 3,900 |
| May 18, 2026 | Howley W Nicholas | 10K |
| May 15, 2026 | Reiss Joel | 3,900 |
| Apr 20, 2026 | Howley W Nicholas | 10K |
| Apr 15, 2026 | Reiss Joel | 3,900 |
| Mar 20, 2026 | Howley W Nicholas | 10K |
| Mar 20, 2026 | MCCULLOUGH GARY E | 37 |
| Mar 20, 2026 | HENNESSY SEAN P | 41 |
| Mar 20, 2026 | BARR DAVID | 41 |
| Mar 20, 2026 | Graff Michael | 30 |
| Mar 20, 2026 | Palmer Peter | 30 |
| Mar 20, 2026 | Santana Michele | 30 |
| Mar 20, 2026 | CRONIN JANE M. | 30 |
| Mar 16, 2026 | Reiss Joel | 3,900 |
| Feb 24, 2026 | Murphy Patrick Joseph | 1,460 |
| Feb 18, 2026 | Howley W Nicholas | 10K |
| Feb 17, 2026 | Reiss Joel | 3,900 |
| Feb 5, 2026 | Wynne Sarah | 1,494 |
| Feb 2, 2026 | Stein Kevin M | 48K |
| Feb 2, 2026 | Murphy Patrick Joseph | 290 |
| Jan 15, 2026 | Reiss Joel | 3,900 |
| Jan 14, 2026 | Stein Kevin M | 7,627 |
| Jan 8, 2026 | Stein Kevin M | 42K |
| Jan 2, 2026 | Murphy Patrick Joseph | 290 |
| Dec 15, 2025 | Reiss Joel | 3,900 |
| Dec 10, 2025 | SMALL ROBERT J | 4,700 |
| Dec 4, 2025 | Stein Kevin M | 18K |
| Dec 1, 2025 | Murphy Patrick Joseph | 290 |
| Nov 28, 2025 | Stein Kevin M | 8,809 |
| Nov 21, 2025 | Stein Kevin M | 8,525 |
| Nov 21, 2025 | Graff Michael | 340 |
| Nov 17, 2025 | Howley W Nicholas | 2,736 |
| Nov 17, 2025 | Reiss Joel | 3,900 |
| Nov 3, 2025 | Murphy Patrick Joseph | 290 |
| Oct 27, 2025 | Stein Kevin M | 700 |
| Oct 27, 2025 | Murphy Patrick Joseph | 580 |
| Oct 20, 2025 | Reiss Joel | 3,000 |
| Oct 15, 2025 | Howley W Nicholas | 2,736 |
| Sep 22, 2025 | Reiss Joel | 3,000 |
| Sep 19, 2025 | SMALL ROBERT J | 10K |
| Sep 19, 2025 | HENNESSY SEAN P | 36 |
| Sep 19, 2025 | BARR DAVID | 36 |
| Sep 19, 2025 | Graff Michael | 29 |
| Sep 19, 2025 | Santana Michele | 29 |
| Sep 19, 2025 | CRONIN JANE M. | 29 |
| Sep 15, 2025 | Howley W Nicholas | 2,736 |
| Aug 26, 2025 | Graff Michael | 1,760 |
| Aug 20, 2025 | Reiss Joel | 3,000 |
| Aug 15, 2025 | Howley W Nicholas | 2,736 |
| Jul 21, 2025 | Reiss Joel | 3,000 |
| Jul 15, 2025 | Howley W Nicholas | 2,736 |
| Jun 20, 2025 | Reiss Joel | 3,000 |
| Jun 16, 2025 | Howley W Nicholas | 2,736 |
| Jun 13, 2025 | Wynne Sarah | 5,000 |
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
The chart, in numbers
| Flow | Shares |
|---|---|
| From holdings | 85K |
| Granted | 555 |
| Vested / exercised | 268K |
| Bought on market | 2,905 |
| Planned sales (10b5-1) | 247K |
| Discretionary sales | 110K |
| Gifts | 340 |
Skin in the game
Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
The chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| SMALL ROBERT J | 41K | 5,625 | 13.6 |
| HENNESSY SEAN P | 34K | 34K | 99.6 |
| BARR DAVID | 32K | 32K | 101.2 |
Who holds what
the 14 largest holdings of 16| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| SMALL ROBERT J Last trade Feb 25, 2026 | Director | 376K | $1K | $128M | net selling over the year: 1 month buying, 1 month selling | Feb 25, 2026 |
| Stein Kevin M President & CEO Last trade Feb 2, 2026 | CEO | 45K | – | $186M | net selling over the year: 0 months buying, 5 months selling | Feb 2, 2026 |
| HENNESSY SEAN P Last trade May 20, 2025 | Director | 34K | – | – | May 20, 2025 | |
| BARR DAVID Last trade Sep 10, 2009 | Director | 32K | – | – | Sep 10, 2009 | |
| Howley W Nicholas Last trade Aug 18, 2026 | Director | 32K | – | $96M | net selling over the year: 0 months buying, 9 months selling | Aug 18, 2026 |
| Valladares III Jorge L. Last trade May 14, 2025 | Director | 15K | – | – | May 14, 2025 | |
| Graff Michael Last trade Aug 26, 2025 | Director | 8,683 | – | – | Aug 26, 2025 | |
| Reiss Joel Co-Chief Operating Officer Last trade Sep 15, 2026 | COO | 7,500 | – | $62M | net selling over the year: 0 months buying, 13 months selling | Sep 15, 2026 |
| Wynne Sarah Chief Financial Officer Last trade Jun 13, 2025 | CFO | 4,904 | – | – | Jun 13, 2025 | |
| Palmer Peter Last trade Sep 13, 2016 | Director | 4,030 | – | – | Sep 13, 2016 | |
| Lisman Michael President & CEO Last trade Feb 6, 2026 | CEO | 3,859 | $3.8M | – | net buying over the year: 2 months buying, 0 months selling | Feb 6, 2026 |
| Murphy Patrick Joseph Co-Chief Operating Officer Last trade Feb 2, 2026 | COO | 2,215 | – | $2.4M | net selling over the year: 0 months buying, 5 months selling | Feb 2, 2026 |
| Warren Jessica L GC, CCO, Secretary Last trade May 13, 2025 | Officer | 1,065 | – | – | May 13, 2025 | |
| MCCULLOUGH GARY E | Director | 952 | – | – | – |
Open-market trade log
the 60 most recent of 7,752| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Sep 15, 2026 | Reiss Joel (COO) 5 shares $1,105.28 −0.7% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 5 | $1,105.28 | $6K | −0.7% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 10 shares $1,088.06 +0.9% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 10 | $1,088.06 | $11K | +0.9% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 20 shares $1,113.37 −1.5% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 20 | $1,113.37 | $22K | −1.5% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 20 shares $1,119.00 −1.9% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 20 | $1,119.00 | $22K | −1.9% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 30 shares $1,108.34 −1.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 30 | $1,108.34 | $33K | −1.0% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 30 shares $1,112.38 −1.4% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 30 | $1,112.38 | $33K | −1.4% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 40 shares $1,106.69 −0.9% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 40 | $1,106.69 | $44K | −0.9% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 60 shares $1,100.41 −0.3% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 60 | $1,100.41 | $66K | −0.3% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 70 shares $1,090.06 +0.7% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 70 | $1,090.06 | $76K | +0.7% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 90 shares $1,099.14 −0.2% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 90 | $1,099.14 | $99K | −0.2% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 100 shares $1,091.00 +0.6% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 100 | $1,091.00 | $109K | +0.6% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 110 shares $1,086.27 +1.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 110 | $1,086.27 | $119K | +1.0% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 120 shares $1,087.49 +0.9% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 120 | $1,087.49 | $130K | +0.9% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 125 shares $1,104.58 −0.7% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 125 | $1,104.58 | $138K | −0.7% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 150 shares $1,098.41 −0.1% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 150 | $1,098.41 | $165K | −0.1% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 166 shares $1,101.52 −0.4% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 166 | $1,101.52 | $183K | −0.4% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 170 shares $1,083.67 +1.3% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 170 | $1,083.67 | $184K | +1.3% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 170 shares $1,092.13 +0.5% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 170 | $1,092.13 | $186K | +0.5% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 196 shares $1,096.17 +0.1% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 196 | $1,096.17 | $215K | +0.1% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 210 shares $1,103.44 −0.6% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 210 | $1,103.44 | $232K | −0.6% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 225 shares $1,095.11 +0.2% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 225 | $1,095.11 | $246K | +0.2% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 240 shares $1,084.87 +1.1% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 240 | $1,084.87 | $260K | +1.1% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 274 shares $1,102.49 −0.5% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 274 | $1,102.49 | $302K | −0.5% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 282 shares $1,093.10 +0.4% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 282 | $1,093.10 | $308K | +0.4% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 294 shares $1,097.26 +0.0% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 294 | $1,097.26 | $323K | +0.0% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 310 shares $1,082.96 +1.3% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 310 | $1,082.96 | $336K | +1.3% | Sep 16, 2026 |
| Sep 15, 2026 | Reiss Joel (COO) 383 shares $1,094.06 +0.3% since trade filed Sep 16, 2026 | Planned sale (10b5-1) | 383 | $1,094.06 | $419K | +0.3% | Sep 16, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 70 shares $1,227.62 −10.6% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 70 | $1,227.62 | $86K | −10.6% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 140 shares $1,236.12 −11.2% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 140 | $1,236.12 | $173K | −11.2% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 190 shares $1,241.14 −11.6% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 190 | $1,241.14 | $236K | −11.6% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 204 shares $1,225.60 −10.5% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 204 | $1,225.60 | $250K | −10.5% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 250 shares $1,236.89 −11.3% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 250 | $1,236.89 | $309K | −11.3% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 270 shares $1,234.69 −11.1% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 270 | $1,234.69 | $333K | −11.1% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 290 shares $1,229.09 −10.7% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 290 | $1,229.09 | $356K | −10.7% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 450 shares $1,233.30 −11.0% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 450 | $1,233.30 | $555K | −11.0% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 520 shares $1,238.08 −11.4% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 520 | $1,238.08 | $644K | −11.4% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 570 shares $1,230.02 −10.8% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 570 | $1,230.02 | $701K | −10.8% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 830 shares $1,231.12 −10.9% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 830 | $1,231.12 | $1.0M | −10.9% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 1,055 shares $1,232.01 −10.9% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 1,055 | $1,232.01 | $1.3M | −10.9% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 1,313 shares $1,240.42 −11.5% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 1,313 | $1,240.42 | $1.6M | −11.5% | Aug 19, 2026 |
| Aug 18, 2026 | Howley W Nicholas (Director) 3,980 shares $1,239.17 −11.5% since trade filed Aug 19, 2026 | Planned sale (10b5-1) | 3,980 | $1,239.17 | $4.9M | −11.5% | Aug 19, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 20 shares $1,250.82 −12.3% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 20 | $1,250.82 | $25K | −12.3% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 30 shares $1,253.08 −12.4% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 30 | $1,253.08 | $38K | −12.4% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 37 shares $1,245.90 −11.9% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 37 | $1,245.90 | $46K | −11.9% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 48 shares $1,247.31 −12.0% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 48 | $1,247.31 | $60K | −12.0% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 60 shares $1,248.26 −12.1% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 60 | $1,248.26 | $75K | −12.1% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 80 shares $1,252.11 −12.4% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 80 | $1,252.11 | $100K | −12.4% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 100 shares $1,243.91 −11.8% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 100 | $1,243.91 | $124K | −11.8% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 112 shares $1,242.28 −11.7% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 112 | $1,242.28 | $139K | −11.7% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 120 shares $1,240.78 −11.6% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 120 | $1,240.78 | $149K | −11.6% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 138 shares $1,243.03 −11.7% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 138 | $1,243.03 | $172K | −11.7% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 140 shares $1,232.82 −11.0% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 140 | $1,232.82 | $173K | −11.0% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 145 shares $1,245.29 −11.9% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 145 | $1,245.29 | $181K | −11.9% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 260 shares $1,233.87 −11.1% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 260 | $1,233.87 | $321K | −11.1% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 327 shares $1,234.93 −11.2% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 327 | $1,234.93 | $404K | −11.2% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 340 shares $1,238.84 −11.4% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 340 | $1,238.84 | $421K | −11.4% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 373 shares $1,235.86 −11.2% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 373 | $1,235.86 | $461K | −11.2% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 400 shares $1,239.99 −11.5% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 400 | $1,239.99 | $496K | −11.5% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 499 shares $1,237.87 −11.4% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 499 | $1,237.87 | $618K | −11.4% | Aug 18, 2026 |
| Aug 17, 2026 | Reiss Joel (COO) 671 shares $1,236.80 −11.3% since trade filed Aug 18, 2026 | Planned sale (10b5-1) | 671 | $1,236.80 | $830K | −11.3% | Aug 18, 2026 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles.
Filing hygiene
242 Forms 4, 3 years
4 filed late
3 amendments
16.2 avg. days to file
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.