TDG TransDigm Group Incorporated

NYSE
$1,140.32

TransDigm Group Incorporated (TDG) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with TDG's own trailing one-year pace, with 0% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 2 sellers in the last 90 days
Insiders buying
2
8 transactions
Insiders selling
5
553 transactions
Purchases
$3.8M
2,905 shares
Sales
$506.3M
380,385 shares
Net activity
-$502.4M
purchases less sales

How much of that selling was preplanned? 0% planned / 100% discretionary

10b5-1 plan sales $0 0 transactions · 0 shares
Discretionary sales $506.3M 553 transactions · 380,385 shares

Largest single sale: $101.1M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: February 25, 2026 , by SMALL ROBERT J .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Howley W Nicholas 14 fills Director Sell 10,132 $1,236.28 $12.5M 31,476 −24.4% of holding
Reiss Joel 19 fills Co-Chief Operating Officer Sell 3,900 $1,238.76 $4.8M 7,360 −34.6% of holding
Howley W Nicholas 12 fills Director Sell 10,132 $1,216.08 $12.3M 31,110 −24.6% of holding
Reiss Joel 33 fills Co-Chief Operating Officer Sell 3,900 $1,217.79 $4.7M 7,490 −34.2% of holding
Howley W Nicholas 66 fills Director Sell 30,396 $1,319.55 $40.1M 31,568 −49.1% of holding
Reiss Joel 18 fills Co-Chief Operating Officer Sell 3,900 $1,276.78 $5.0M 7,468 −34.3% of holding
Howley W Nicholas 25 fills Director Sell 10,132 $1,180.82 $12.0M 31,640 −24.3% of holding
Reiss Joel 27 fills Co-Chief Operating Officer Sell 3,900 $1,154.09 $4.5M 7,429 −34.4% of holding
Howley W Nicholas 11 fills Director Sell 10,132 $1,265.06 $12.8M 31,620 −24.3% of holding
Reiss Joel 17 fills Co-Chief Operating Officer Sell 3,900 $1,280.46 $5.0M 7,267 −34.9% of holding
Howley W Nicholas 23 fills Director Sell 10,132 $1,213.05 $12.3M 31,478 −24.4% of holding
Reiss Joel 19 fills Co-Chief Operating Officer Sell 3,900 $1,243.70 $4.9M 7,480 −34.3% of holding
SMALL ROBERT J Director Buy 1 $1,285.00 $1.3K 366,142
Howley W Nicholas 13 fills Director Sell 10,168 $1,307.68 $13.3M 30,796 −24.8% of holding
Reiss Joel 23 fills Co-Chief Operating Officer Sell 3,900 $1,293.88 $5.0M 7,473 −34.3% of holding
Lisman Michael President & CEO Buy 950 $1,284.26 $1.2M 3,259
Stein Kevin M 32 fills Director Sell 48,000 $1,427.79 $68.5M 56,118 −46.1% of holding
Murphy Patrick Joseph Co-Chief Operating Officer Sell 290 $1,430.10 $414.7K 1,055 −21.6% of holding
Reiss Joel 18 fills Co-Chief Operating Officer Sell 3,900 $1,429.92 $5.6M 7,456 −34.3% of holding
Stein Kevin M 3 fills Director Sell 7,627 $1,406.38 $10.7M 13,644 −35.9% of holding
Stein Kevin M 7 fills Director Sell 17,373 $1,407.25 $24.4M 19,147 −47.6% of holding
Stein Kevin M 21 fills Director Sell 25,000 $1,373.59 $34.3M 32,598 −43.4% of holding
Murphy Patrick Joseph Co-Chief Operating Officer Sell 290 $1,329.03 $385.4K 1,055 −21.6% of holding
Reiss Joel 26 fills Co-Chief Operating Officer Sell 3,900 $1,290.52 $5.0M 7,420 −34.5% of holding
SMALL ROBERT J 3 fills Director Sell 4,700 $1,290.19 $6.1M 9,745 −32.5% of holding
SMALL ROBERT J 2 fills Director Sell 90,953 $1,335.72 $121.5M 366,141 −19.9% of holding
Stein Kevin M 8 fills Director Sell 17,526 $1,362.29 $23.9M 18,774 −48.3% of holding
Murphy Patrick Joseph Co-Chief Operating Officer Sell 290 $1,351.06 $391.8K 1,055 −21.6% of holding
Stein Kevin M 3 fills Director Sell 4,592 $1,360.73 $6.2M 9,753 −32% of holding
Stein Kevin M Director Sell 30 $1,360.06 $40.8K 8,158 −0.4% of holding
Stein Kevin M 2 fills Director Sell 4,187 $1,360.58 $5.7M 8,248 −33.7% of holding
Stein Kevin M Director Sell 230 $1,360.31 $312.9K 8,158 −2.7% of holding
Stein Kevin M 3 fills Director Sell 1,104 $1,360.89 $1.5M 8,607 −11.4% of holding
Stein Kevin M 5 fills Director Sell 7,191 $1,361.57 $9.8M 11,769 −37.9% of holding
Reiss Joel 25 fills Co-Chief Operating Officer Sell 3,900 $1,340.00 $5.2M 7,490 −34.2% of holding
Howley W Nicholas 14 fills Director Sell 2,736 $1,334.92 $3.7M 24,274 −10.1% of holding
Lisman Michael 6 fills President & CEO Buy 1,954 $1,339.14 $2.6M 1,954
Murphy Patrick Joseph Co-Chief Operating Officer Sell 290 $1,310.00 $379.9K 1,055 −21.6% of holding
Stein Kevin M Director Sell 700 $1,360.00 $952.0K 8,158 −7.9% of holding
Murphy Patrick Joseph Co-Chief Operating Officer Sell 580 $1,354.76 $785.8K 1,055 −35.5% of holding
Reiss Joel 9 fills Co-Chief Operating Officer Sell 3,000 $1,279.59 $3.8M 6,558 −31.4% of holding
Howley W Nicholas 11 fills Director Sell 2,736 $1,298.87 $3.6M 23,978 −10.2% of holding
Reiss Joel 8 fills Co-Chief Operating Officer Sell 3,000 $1,276.07 $3.8M 6,464 −31.7% of holding
Howley W Nicholas 11 fills Director Sell 2,736 $1,282.47 $3.5M 24,134 −10.2% of holding
SMALL ROBERT J 14 fills Director Sell 5,000 $1,276.98 $6.4M 88,016 −5.4% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.