TDG
insider transactionsTransDigm Group INC — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Net shares · 90d
-32.0K
0 buy · 32.0K sell
Net value · 90d
-$39.3M
$0 in · $39.3M out
Sentiment · 90d
Net selling
0% buying · 100% selling
Open-market trades · 90d
98
0 buy · 32.0K sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
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Exercise·M
Co-Chief Operating Officer
$0
3.9K sh
Own +33%
-
Sell·S
Co-Chief Operating Officer
$38.6K
30 sh · $1,287.59
Own -1%
-
Sell·S
Co-Chief Operating Officer
$77.2K
60 sh · $1,285.90
Own -2%
-
Sell·S
Co-Chief Operating Officer
$95.1K
74 sh · $1,285.04
Own -2%
-
Sell·S
Co-Chief Operating Officer
$174.6K
136 sh · $1,283.73
Own -3%
-
Sell·S
Co-Chief Operating Officer
$115.4K
90 sh · $1,282.60
Own -2%
-
Sell·S
Co-Chief Operating Officer
$192.3K
150 sh · $1,281.84
Own -4%
-
Sell·S
Co-Chief Operating Officer
$194.6K
152 sh · $1,280.50
Own -4%
-
Sell·S
Co-Chief Operating Officer
$202.2K
158 sh · $1,279.55
Own -4%
-
Sell·S
Co-Chief Operating Officer
$404.0K
316 sh · $1,278.53
Own -7%
-
Sell·S
Co-Chief Operating Officer
$631.1K
494 sh · $1,277.43
Own -9%
-
Sell·S
Co-Chief Operating Officer
$546.3K
428 sh · $1,276.42
Own -8%
-
Sell·S
Co-Chief Operating Officer
$640.2K
502 sh · $1,275.35
Own -8%
-
Sell·S
Co-Chief Operating Officer
$764.6K
600 sh · $1,274.35
Own -9%
-
Sell·S
Co-Chief Operating Officer
$382.0K
300 sh · $1,273.33
Own -4%
-
Sell·S
Co-Chief Operating Officer
$221.4K
174 sh · $1,272.38
Own -2%
-
Sell·S
Co-Chief Operating Officer
$185.6K
146 sh · $1,271.29
Own -2%
-
Sell·S
Co-Chief Operating Officer
$73.7K
58 sh · $1,270.02
Own -1%
-
Sell·S
Co-Chief Operating Officer
$40.6K
32 sh · $1,268.87
Own -0%
-
Exercise·M
Co-Chief Operating Officer
$1.1M
3.9K sh · $284.97
Own +108%
-
Exercise·M
Director · 10b5-1
$0
10.1K sh
Own +46%
-
Sell·S
Director · 10b5-1
$157.0K
132 sh · $1,189.02
Own -1%
-
Sell·S
Director · 10b5-1
$4.5M
3.8K sh · $1,188.13
Own -15%
-
Sell·S
Director · 10b5-1
$322.9K
272 sh · $1,187.11
Own -1%
-
Sell·S
Director · 10b5-1
$531.3K
448 sh · $1,185.97
Own -2%
-
Sell·S
Director · 10b5-1
$1.3M
1.1K sh · $1,185.05
Own -4%
-
Sell·S
Director · 10b5-1
$103.0K
87 sh · $1,183.86
Own -0%
-
Sell·S
Director · 10b5-1
$343.0K
290 sh · $1,182.81
Own -1%
-
Sell·S
Director · 10b5-1
$516.1K
437 sh · $1,180.97
Own -2%
-
Sell·S
Director · 10b5-1
$294.9K
250 sh · $1,179.67
Own -1%
-
Sell·S
Director · 10b5-1
$164.9K
140 sh · $1,178.14
Own -0%
-
Sell·S
Director · 10b5-1
$47.1K
40 sh · $1,176.68
Own -0%
-
Sell·S
Director · 10b5-1
$368.1K
313 sh · $1,175.96
Own -1%
-
Sell·S
Director · 10b5-1
$804.3K
685 sh · $1,174.17
Own -2%
-
Sell·S
Director · 10b5-1
$257.9K
220 sh · $1,172.31
Own -1%
-
Sell·S
Director · 10b5-1
$70.2K
60 sh · $1,170.38
Own -0%
-
Sell·S
Director · 10b5-1
$456.0K
390 sh · $1,169.24
Own -1%
-
Sell·S
Director · 10b5-1
$540.9K
463 sh · $1,168.33
Own -2%
-
Sell·S
Director · 10b5-1
$683.9K
586 sh · $1,167.05
Own -2%
-
Sell·S
Director · 10b5-1
$128.2K
110 sh · $1,165.51
Own -0%
-
Sell·S
Director · 10b5-1
$26.8K
23 sh · $1,163.98
Own -0%
-
Sell·S
Director · 10b5-1
$58.1K
50 sh · $1,162.95
Own -0%
-
Sell·S
Director · 10b5-1
$92.8K
80 sh · $1,160.00
Own -0%
-
Sell·S
Director · 10b5-1
$92.0K
80 sh · $1,150.17
Own -0%
-
Sell·S
Director · 10b5-1
$68.8K
60 sh · $1,146.42
Own -0%
-
Sell·S
Director · 10b5-1
$45.8K
40 sh · $1,145.16
Own -0%
-
Exercise·M
Director · 10b5-1
$673.5K
10.1K sh · $66.47
Own +47%
-
Exercise·M
Co-Chief Operating Officer · 10b5-1
$0
3.9K sh
Own +25%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$55.2K
47 sh · $1,175.28
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$35.2K
30 sh · $1,174.39
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$73.9K
63 sh · $1,172.69
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$50.4K
43 sh · $1,172.05
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$30.4K
26 sh · $1,170.54
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$94.7K
81 sh · $1,169.13
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$217.3K
186 sh · $1,168.13
Own -5%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$141.2K
121 sh · $1,167.02
Own -3%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$206.4K
177 sh · $1,165.94
Own -4%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$88.5K
76 sh · $1,164.94
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$11.6K
10 sh · $1,163.19
Own -0%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$127.9K
110 sh · $1,162.65
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$81.2K
70 sh · $1,160.33
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$110.2K
95 sh · $1,159.69
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$52.1K
45 sh · $1,158.62
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$57.8K
50 sh · $1,156.07
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$80.8K
70 sh · $1,154.78
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$150.0K
130 sh · $1,153.71
Own -3%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$57.6K
50 sh · $1,152.28
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$173.9K
151 sh · $1,151.49
Own -3%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$136.9K
119 sh · $1,150.33
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$532.1K
463 sh · $1,149.33
Own -8%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$889.9K
775 sh · $1,148.25
Own -12%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$530.2K
462 sh · $1,147.52
Own -7%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$137.5K
120 sh · $1,146.17
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$296.6K
259 sh · $1,145.37
Own -3%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$81.3K
71 sh · $1,144.43
Own -1%
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Exercise·M
Co-Chief Operating Officer · 10b5-1
$1.1M
3.9K sh · $284.97
Own +108%
-
Other·G
Director
$0
3.5M sh
Own -85%
-
Exercise·M
Director · 10b5-1
$0
343 sh
Own +1%
-
Exercise·M
Director · 10b5-1
$0
9.8K sh
Own New
-
Sell·S
Director · 10b5-1
$76.3K
60 sh · $1,271.63
Own -0%
-
Sell·S
Director · 10b5-1
$546.3K
430 sh · $1,270.46
Own -2%
-
Sell·S
Director · 10b5-1
$342.8K
270 sh · $1,269.62
Own -1%
-
Sell·S
Director · 10b5-1
$1.2M
940 sh · $1,268.46
Own -4%
-
Sell·S
Director · 10b5-1
$2.1M
1.7K sh · $1,267.14
Own -7%
-
Sell·S
Director · 10b5-1
$1.7M
1.3K sh · $1,266.13
Own -5%
-
Sell·S
Director · 10b5-1
$877.9K
694 sh · $1,264.95
Own -3%
-
Sell·S
Director · 10b5-1
$744.4K
589 sh · $1,263.81
Own -2%
-
Sell·S
Director · 10b5-1
$3.9M
3.1K sh · $1,262.66
Own -10%
-
Sell·S
Director · 10b5-1
$1.3M
1.0K sh · $1,261.64
Own -3%
-
Sell·S
Director · 10b5-1
$75.6K
60 sh · $1,260.34
Own -0%
-
Exercise·M
Director · 10b5-1
$22.8K
343 sh · $66.47
Own +1%
-
Exercise·M
Director · 10b5-1
$498.5K
9.8K sh · $50.92
Own +45%
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Exercise·M
Co-Chief Operating Officer · 10b5-1
$0
3.9K sh
Own +20%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$64.7K
50 sh · $1,294.77
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$68.5K
53 sh · $1,292.66
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$73.6K
57 sh · $1,291.76
Own -2%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$12.9K
10 sh · $1,289.25
Own -0%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$128.7K
100 sh · $1,286.57
Own -3%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$41.1K
32 sh · $1,285.33
Own -1%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$212.0K
165 sh · $1,284.59
Own -4%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$418.4K
326 sh · $1,283.55
Own -7%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$395.0K
308 sh · $1,282.37
Own -7%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$483.2K
377 sh · $1,281.58
Own -7%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$735.0K
574 sh · $1,280.41
Own -10%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$664.0K
519 sh · $1,279.39
Own -8%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$498.6K
390 sh · $1,278.41
Own -6%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$259.3K
203 sh · $1,277.23
Own -3%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$488.9K
383 sh · $1,276.49
Own -5%
-
Sell·S
Co-Chief Operating Officer · 10b5-1
$153.0K
120 sh · $1,275.19
Own -2%
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Sell·S
Co-Chief Operating Officer · 10b5-1
$297.0K
233 sh · $1,274.57
Own -3%
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Exercise·M
Co-Chief Operating Officer · 10b5-1
$1.1M
3.9K sh · $284.97
Own +108%
-
Other·G
Director
$0
1.0M sh
Own -20%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 15, 2026 | Joel Reiss | Exercise M | 3.9K | $0 |
| Jun 15, 2026 | Joel Reiss | Sell S | 30 | $38.6K |
| Jun 15, 2026 | Joel Reiss | Sell S | 60 | $77.2K |
| Jun 15, 2026 | Joel Reiss | Sell S | 74 | $95.1K |
| Jun 15, 2026 | Joel Reiss | Sell S | 136 | $174.6K |
| Jun 15, 2026 | Joel Reiss | Sell S | 90 | $115.4K |
| Jun 15, 2026 | Joel Reiss | Sell S | 150 | $192.3K |
| Jun 15, 2026 | Joel Reiss | Sell S | 152 | $194.6K |
| Jun 15, 2026 | Joel Reiss | Sell S | 158 | $202.2K |
| Jun 15, 2026 | Joel Reiss | Sell S | 316 | $404.0K |
| Jun 15, 2026 | Joel Reiss | Sell S | 494 | $631.1K |
| Jun 15, 2026 | Joel Reiss | Sell S | 428 | $546.3K |
| Jun 15, 2026 | Joel Reiss | Sell S | 502 | $640.2K |
| Jun 15, 2026 | Joel Reiss | Sell S | 600 | $764.6K |
| Jun 15, 2026 | Joel Reiss | Sell S | 300 | $382.0K |
| Jun 15, 2026 | Joel Reiss | Sell S | 174 | $221.4K |
| Jun 15, 2026 | Joel Reiss | Sell S | 146 | $185.6K |
| Jun 15, 2026 | Joel Reiss | Sell S | 58 | $73.7K |
| Jun 15, 2026 | Joel Reiss | Sell S | 32 | $40.6K |
| Jun 15, 2026 | Joel Reiss | Exercise M | 3.9K | $1.1M |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Exercise M | 10.1K | $0 |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 132 | $157.0K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 3.8K | $4.5M |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 272 | $322.9K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 448 | $531.3K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 1.1K | $1.3M |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 87 | $103.0K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 290 | $343.0K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 437 | $516.1K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 250 | $294.9K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 140 | $164.9K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 40 | $47.1K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 313 | $368.1K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 685 | $804.3K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 220 | $257.9K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 60 | $70.2K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 390 | $456.0K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 463 | $540.9K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 586 | $683.9K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 110 | $128.2K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 23 | $26.8K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 50 | $58.1K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 80 | $92.8K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 80 | $92.0K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 60 | $68.8K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Sell S | 40 | $45.8K |
| May 18, 2026 | Nicholas W Howley 10b5-1 | Exercise M | 10.1K | $673.5K |
| May 15, 2026 | Joel Reiss 10b5-1 | Exercise M | 3.9K | $0 |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 47 | $55.2K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 30 | $35.2K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 63 | $73.9K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 43 | $50.4K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 26 | $30.4K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 81 | $94.7K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 186 | $217.3K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 121 | $141.2K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 177 | $206.4K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 76 | $88.5K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 10 | $11.6K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 110 | $127.9K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 70 | $81.2K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 95 | $110.2K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 45 | $52.1K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 50 | $57.8K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 70 | $80.8K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 130 | $150.0K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 50 | $57.6K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 151 | $173.9K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 119 | $136.9K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 463 | $532.1K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 775 | $889.9K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 462 | $530.2K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 120 | $137.5K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 259 | $296.6K |
| May 15, 2026 | Joel Reiss 10b5-1 | Sell S | 71 | $81.3K |
| May 15, 2026 | Joel Reiss 10b5-1 | Exercise M | 3.9K | $1.1M |
| Apr 23, 2026 | Nicholas W Howley | Other G | 3.5M | $0 |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Exercise M | 343 | $0 |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Exercise M | 9.8K | $0 |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 60 | $76.3K |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 430 | $546.3K |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 270 | $342.8K |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 940 | $1.2M |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 1.7K | $2.1M |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 1.3K | $1.7M |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 694 | $877.9K |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 589 | $744.4K |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 3.1K | $3.9M |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 1.0K | $1.3M |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Sell S | 60 | $75.6K |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Exercise M | 343 | $22.8K |
| Apr 20, 2026 | Nicholas W Howley 10b5-1 | Exercise M | 9.8K | $498.5K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Exercise M | 3.9K | $0 |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 50 | $64.7K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 53 | $68.5K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 57 | $73.6K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 10 | $12.9K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 100 | $128.7K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 32 | $41.1K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 165 | $212.0K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 326 | $418.4K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 308 | $395.0K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 377 | $483.2K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 574 | $735.0K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 519 | $664.0K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 390 | $498.6K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 203 | $259.3K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 383 | $488.9K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 120 | $153.0K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Sell S | 233 | $297.0K |
| Apr 15, 2026 | Joel Reiss 10b5-1 | Exercise M | 3.9K | $1.1M |
| Apr 1, 2026 | Nicholas W Howley | Other G | 1.0M | $0 |
About TDG insider trading
This page tracks insider transactions for TransDigm Group INC (TDG) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.