ALSN
insider transactionsAllison Transmission Holdings 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 · 365d
-15.7K
0 buy · 15.7K sell
Net value · 365d
-$1.8M
$0 in · $1.8M out
Sentiment · 365d
Net selling
0% buying · 100% selling
Open-market trades · 365d
7
0 buy · 15.7K 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
-
Exercise·M
Officer
$0
10 sh
Own +6%
-
Exercise·M
Officer
$0
533 sh
Own +53300%
-
Other·F
Officer
$28.6K
242 sh · $118.38
Own -0%
-
Exercise·M
Officer
—
10 sh
Own +0%
-
Exercise·M
Officer
—
533 sh
Own +0%
-
Grant·A
Title: President and Business…
$0
42 sh
Own +100%
-
Grant·A
Director
$0
3 sh
Own New
-
Grant·A
Director
$0
3 sh
Own New
-
Grant·A
Scott A Mell KEY
CFO & Treasurer
$0
31 sh
Own +44%
-
Grant·A
Director
$0
59 sh
Own +4%
-
Grant·A
Director
$0
3 sh
Own New
-
Grant·A
Title: President and Business…
$0
39 sh
Own +28%
-
Grant·A
Director
$0
3 sh
Own New
-
Grant·A
CLO & Asst. Secretary
$0
13 sh
Own +35%
-
Grant·A
Chair, President and CEO
$0
144 sh
Own +27%
-
Grant·A
Director
$0
3 sh
Own New
-
Grant·A
Director
$0
57 sh
Own +4%
-
Grant·A
Director
$0
73 sh
Own +2%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
$0
1.3K sh
Own +25%
-
Sell·S
Scott A Mell KEY
CFO & Treasurer
$167.1K
1.3K sh · $125.00
Own -56%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
$119.5K
1.3K sh · $89.41
Own +127%
-
Sell·S
Scott A Mell KEY
CFO & Treasurer
$116.6K
933 sh · $125.00
Own -47%
-
Grant·A
Director
$0
1.5K sh
Own +7%
-
Grant·A
Director
$0
1.5K sh
Own +7%
-
Grant·A
Director
$0
1.5K sh
Own +4%
-
Grant·A
Director
$0
1.5K sh
Own New
-
Grant·A
Director
$0
1.5K sh
Own New
-
Grant·A
Director
$0
1.5K sh
Own New
-
Grant·A
Director
$0
1.5K sh
Own New
-
Grant·A
Director
$0
1.5K sh
Own New
-
Exercise·M
Director
$0
16 sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own +14%
-
Grant·A
Director
$0
92 sh
Own +1%
-
Exercise·M
Director
$0
16 sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own +18%
-
Exercise·M
Director
$0
16 sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own +20%
-
Exercise·M
Director
$0
16 sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own +18%
-
Grant·A
Director
$0
92 sh
Own +1%
-
Exercise·M
Director
$0
16 sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own New
-
Exercise·M
Director
$0
1.6K sh
Own +20%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
$0
9 sh
Own +15%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
$0
891 sh
Own +100%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
$0
14 sh
Own +21%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
$0
2.0K sh
Own +195100%
-
Other·F
Scott A Mell KEY
CFO & Treasurer
$112.7K
879 sh · $128.26
Own -31%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
—
23 sh
Own +1%
-
Exercise·M
Scott A Mell KEY
CFO & Treasurer
—
2.8K sh
Own New
-
Grant·A
Chair, President and CEO
$0
148 sh
Own +39%
-
Grant·A
Director
$0
4 sh
Own +33%
-
Grant·A
Director
$0
4 sh
Own +33%
-
Grant·A
Director
$0
4 sh
Own +33%
-
Grant·A
CLO & Asst. Secretary
$0
13 sh
Own +54%
-
Grant·A
Scott A Mell KEY
CFO & Treasurer
$0
40 sh
Own +74%
-
Grant·A
Title: President and Business…
$0
39 sh
Own +38%
-
Grant·A
Director
$0
56 sh
Own +4%
-
Grant·A
Director
$0
4 sh
Own +33%
-
Grant·A
Director
$0
54 sh
Own +4%
-
Grant·A
Director
$0
4 sh
Own +33%
-
Grant·A
Director
$0
81 sh
Own +2%
-
Grant·A
Title: President and Business…
$0
42 sh
Own New
-
Sell·S
CLO & Asst. Secretary
$150.2K
1.3K sh · $114.40
Own -7%
-
Exercise·M
Chair, President and CEO
$0
78.9K sh
Own New
-
Other·F
Chair, President and CEO
$4.3M
34.7K sh · $125.30
Own -10%
-
Exercise·M
Chair, President and CEO
—
78.9K sh
Own +30%
-
Exercise·M
CLO & Asst. Secretary
$0
5.4K sh
Own New
-
Other·F
CLO & Asst. Secretary
$200.2K
1.6K sh · $125.30
Own -8%
-
Exercise·M
CLO & Asst. Secretary
—
5.4K sh
Own +36%
-
Exercise·M
Title: President and Business…
$0
17.1K sh
Own New
-
Other·F
Title: President and Business…
$949.8K
7.6K sh · $125.30
Own -6%
-
Exercise·M
Title: President and Business…
—
17.1K sh
Own +17%
-
Grant·A
Title: President and Business…
$0
5.3K sh
Own New
-
Grant·A
Scott A Mell KEY
CFO & Treasurer
$0
8.9K sh
Own New
-
Grant·A
Title: President and Business…
$0
9.5K sh
Own New
-
Grant·A
CLO & Asst. Secretary
$0
4.1K sh
Own New
-
Grant·A
Chair, President and CEO
$0
34.3K sh
Own New
-
Exercise·M
CLO & Asst. Secretary
$0
36 sh
Own New
-
Exercise·M
CLO & Asst. Secretary
$0
927 sh
Own New
-
Other·F
CLO & Asst. Secretary
$33.6K
283 sh · $118.85
Own -2%
-
Exercise·M
CLO & Asst. Secretary
—
36 sh
Own +0%
-
Exercise·M
CLO & Asst. Secretary
—
927 sh
Own +6%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
$0
119 sh
Own New
-
Exercise·M
Allison COO,Pres.&BU Leader AT
$0
2.9K sh
Own New
-
Other·F
Allison COO,Pres.&BU Leader AT
$153.8K
1.3K sh · $118.85
Own -1%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
—
119 sh
Own +0%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
—
2.9K sh
Own +3%
-
Exercise·M
Chair, President and CEO
$0
561 sh
Own New
-
Exercise·M
Chair, President and CEO
$0
13.4K sh
Own New
-
Exercise·M
Chair, President and CEO
$0
240 sh
Own +34%
-
Exercise·M
Chair, President and CEO
$0
10.5K sh
Own New
-
Other·F
Chair, President and CEO
$1.2M
10.5K sh · $118.85
Own -4%
-
Exercise·M
Chair, President and CEO
—
561 sh
Own +0%
-
Exercise·M
Chair, President and CEO
—
13.4K sh
Own +5%
-
Exercise·M
Chair, President and CEO
—
240 sh
Own +0%
-
Exercise·M
Chair, President and CEO
—
10.5K sh
Own +4%
-
Exercise·M
CLO & Asst. Secretary
$0
15 sh
Own +33%
-
Exercise·M
CLO & Asst. Secretary
$0
740 sh
Own New
-
Other·F
CLO & Asst. Secretary
$30.7K
258 sh · $118.85
Own -2%
-
Exercise·M
CLO & Asst. Secretary
—
15 sh
Own +0%
-
Exercise·M
CLO & Asst. Secretary
—
740 sh
Own +5%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
$0
50 sh
Own +29%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
$0
2.2K sh
Own New
-
Other·F
Allison COO,Pres.&BU Leader AT
$114.1K
960 sh · $118.85
Own -1%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
—
50 sh
Own +0%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
—
2.2K sh
Own +2%
-
Exercise·M
Chair, President and CEO
$0
67 sh
Own +6%
-
Exercise·M
Chair, President and CEO
$0
6.0K sh
Own +100%
-
Other·F
Chair, President and CEO
$208.6K
1.8K sh · $117.78
Own -1%
-
Grant·A
Chair, President and CEO
—
67 sh
Own +0%
-
Grant·A
Chair, President and CEO
—
6.0K sh
Own +2%
-
Exercise·M
CLO & Asst. Secretary
$0
4 sh
Own +6%
-
Exercise·M
CLO & Asst. Secretary
$0
416 sh
Own +100%
-
Other·F
CLO & Asst. Secretary
$17.3K
147 sh · $117.78
Own -1%
-
Grant·A
CLO & Asst. Secretary
—
4 sh
Own +0%
-
Grant·A
CLO & Asst. Secretary
—
416 sh
Own +3%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
$0
17 sh
Own +7%
-
Exercise·M
Allison COO,Pres.&BU Leader AT
$0
1.6K sh
Own +100%
-
Other·F
Allison COO,Pres.&BU Leader AT
$78.2K
664 sh · $117.78
Own -1%
-
Grant·A
Allison COO,Pres.&BU Leader AT
—
17 sh
Own +0%
-
Grant·A
Allison COO,Pres.&BU Leader AT
—
1.6K sh
Own +2%
-
Exercise·M
Allison COO,Pres.&BU Leader AT · 10b5-1
$0
10.3K sh
Own New
-
Sell·S
Allison COO,Pres.&BU Leader AT · 10b5-1
$551.4K
4.7K sh · $117.02
Own -5%
-
Sell·S
Allison COO,Pres.&BU Leader AT · 10b5-1
$522.9K
4.5K sh · $116.00
Own -4%
-
Sell·S
Allison COO,Pres.&BU Leader AT · 10b5-1
$130.2K
1.1K sh · $115.41
Own -1%
-
Exercise·M
Allison COO,Pres.&BU Leader AT · 10b5-1
$244.1K
10.3K sh · $23.59
Own +10%
-
Grant·A
Chair, President and CEO
$0
78.9K sh
Own New
-
Grant·A
Allison COO,Pres.&BU Leader AT
$0
17.1K sh
Own New
-
Grant·A
CLO & Asst. Secretary
$0
5.4K sh
Own New
-
Grant·A
Director
$0
102 sh
Own +1%
-
Grant·A
Director
$0
102 sh
Own +1%
-
Grant·A
Craig C Price KEY
Title: President and Business…
$0
11.4K sh
Own New
-
Sell·S
SVP, Global MSS · 10b5-1
$176.9K
1.8K sh · $98.79
Own -15%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 4, 2026 | Frederick G Bohley | Exercise M | 10 | $0 |
| Jun 4, 2026 | Frederick G Bohley | Exercise M | 533 | $0 |
| Jun 4, 2026 | Frederick G Bohley | Other F | 242 | $28.6K |
| Jun 4, 2026 | Frederick G Bohley | Exercise M | 10 | — |
| Jun 4, 2026 | Frederick G Bohley | Exercise M | 533 | — |
| May 29, 2026 | Michael Craig Price KEY | Grant A | 42 | $0 |
| May 29, 2026 | Gustave Perna | Grant A | 3 | $0 |
| May 29, 2026 | Sasha Ostojic | Grant A | 3 | $0 |
| May 29, 2026 | Scott A Mell KEY | Grant A | 31 | $0 |
| May 29, 2026 | Carolann I Haznedar | Grant A | 59 | $0 |
| May 29, 2026 | Philip J Christman | Grant A | 3 | $0 |
| May 29, 2026 | Frederick G Bohley KEY | Grant A | 39 | $0 |
| May 29, 2026 | Scott D. Barbour | Grant A | 3 | $0 |
| May 29, 2026 | Eric C. Scroggins | Grant A | 13 | $0 |
| May 29, 2026 | David S. Graziosi KEY | Grant A | 144 | $0 |
| May 29, 2026 | Krishna Shivram | Grant A | 3 | $0 |
| May 29, 2026 | Judy L Altmaier | Grant A | 57 | $0 |
| May 29, 2026 | David C Everitt | Grant A | 73 | $0 |
| May 8, 2026 | Scott A Mell KEY | Exercise M | 1.3K | $0 |
| May 8, 2026 | Scott A Mell KEY | Sell S | 1.3K | $167.1K |
| May 8, 2026 | Scott A Mell KEY | Exercise M | 1.3K | $119.5K |
| May 8, 2026 | Scott A Mell KEY | Sell S | 933 | $116.6K |
| May 7, 2026 | Judy L Altmaier | Grant A | 1.5K | $0 |
| May 7, 2026 | Carolann I Haznedar | Grant A | 1.5K | $0 |
| May 7, 2026 | David C Everitt | Grant A | 1.5K | $0 |
| May 7, 2026 | Scott D. Barbour | Grant A | 1.5K | $0 |
| May 7, 2026 | Sasha Ostojic | Grant A | 1.5K | $0 |
| May 7, 2026 | Krishna Shivram | Grant A | 1.5K | $0 |
| May 7, 2026 | Philip J Christman | Grant A | 1.5K | $0 |
| May 7, 2026 | Gustave Perna | Grant A | 1.5K | $0 |
| May 6, 2026 | Scott D. Barbour | Exercise M | 16 | $0 |
| May 6, 2026 | Scott D. Barbour | Exercise M | 1.6K | $0 |
| May 6, 2026 | Scott D. Barbour | Exercise M | 1.6K | $0 |
| May 6, 2026 | Scott D. Barbour | Grant A | 92 | $0 |
| May 6, 2026 | Sasha Ostojic | Exercise M | 16 | $0 |
| May 6, 2026 | Sasha Ostojic | Exercise M | 1.6K | $0 |
| May 6, 2026 | Sasha Ostojic | Exercise M | 1.6K | $0 |
| May 6, 2026 | Krishna Shivram | Exercise M | 16 | $0 |
| May 6, 2026 | Krishna Shivram | Exercise M | 1.6K | $0 |
| May 6, 2026 | Krishna Shivram | Exercise M | 1.6K | $0 |
| May 6, 2026 | Philip J Christman | Exercise M | 16 | $0 |
| May 6, 2026 | Philip J Christman | Exercise M | 1.6K | $0 |
| May 6, 2026 | Philip J Christman | Exercise M | 1.6K | $0 |
| May 6, 2026 | Philip J Christman | Grant A | 92 | $0 |
| May 6, 2026 | Gustave Perna | Exercise M | 16 | $0 |
| May 6, 2026 | Gustave Perna | Exercise M | 1.6K | $0 |
| May 6, 2026 | Gustave Perna | Exercise M | 1.6K | $0 |
| Apr 14, 2026 | Scott A Mell KEY | Exercise M | 9 | $0 |
| Apr 14, 2026 | Scott A Mell KEY | Exercise M | 891 | $0 |
| Apr 14, 2026 | Scott A Mell KEY | Exercise M | 14 | $0 |
| Apr 14, 2026 | Scott A Mell KEY | Exercise M | 2.0K | $0 |
| Apr 14, 2026 | Scott A Mell KEY | Other F | 879 | $112.7K |
| Apr 14, 2026 | Scott A Mell KEY | Exercise M | 23 | — |
| Apr 14, 2026 | Scott A Mell KEY | Exercise M | 2.8K | — |
| Mar 20, 2026 | David S. Graziosi KEY | Grant A | 148 | $0 |
| Mar 20, 2026 | Philip J Christman | Grant A | 4 | $0 |
| Mar 20, 2026 | Gustave Perna | Grant A | 4 | $0 |
| Mar 20, 2026 | Krishna Shivram | Grant A | 4 | $0 |
| Mar 20, 2026 | Eric C. Scroggins | Grant A | 13 | $0 |
| Mar 20, 2026 | Scott A Mell KEY | Grant A | 40 | $0 |
| Mar 20, 2026 | Frederick G Bohley KEY | Grant A | 39 | $0 |
| Mar 20, 2026 | Carolann I Haznedar | Grant A | 56 | $0 |
| Mar 20, 2026 | Sasha Ostojic | Grant A | 4 | $0 |
| Mar 20, 2026 | Judy L Altmaier | Grant A | 54 | $0 |
| Mar 20, 2026 | Scott D. Barbour | Grant A | 4 | $0 |
| Mar 20, 2026 | David C Everitt | Grant A | 81 | $0 |
| Mar 20, 2026 | Michael Craig Price KEY | Grant A | 42 | $0 |
| Mar 9, 2026 | Eric C. Scroggins | Sell S | 1.3K | $150.2K |
| Feb 28, 2026 | David S. Graziosi KEY | Exercise M | 78.9K | $0 |
| Feb 28, 2026 | David S. Graziosi KEY | Other F | 34.7K | $4.3M |
| Feb 28, 2026 | David S. Graziosi KEY | Exercise M | 78.9K | — |
| Feb 28, 2026 | Eric C. Scroggins | Exercise M | 5.4K | $0 |
| Feb 28, 2026 | Eric C. Scroggins | Other F | 1.6K | $200.2K |
| Feb 28, 2026 | Eric C. Scroggins | Exercise M | 5.4K | — |
| Feb 28, 2026 | Frederick G Bohley KEY | Exercise M | 17.1K | $0 |
| Feb 28, 2026 | Frederick G Bohley KEY | Other F | 7.6K | $949.8K |
| Feb 28, 2026 | Frederick G Bohley KEY | Exercise M | 17.1K | — |
| Feb 25, 2026 | Michael Craig Price KEY | Grant A | 5.3K | $0 |
| Feb 25, 2026 | Scott A Mell KEY | Grant A | 8.9K | $0 |
| Feb 25, 2026 | Frederick G Bohley KEY | Grant A | 9.5K | $0 |
| Feb 25, 2026 | Eric C. Scroggins | Grant A | 4.1K | $0 |
| Feb 25, 2026 | David S. Graziosi KEY | Grant A | 34.3K | $0 |
| Feb 22, 2026 | Eric C. Scroggins | Exercise M | 36 | $0 |
| Feb 22, 2026 | Eric C. Scroggins | Exercise M | 927 | $0 |
| Feb 22, 2026 | Eric C. Scroggins | Other F | 283 | $33.6K |
| Feb 22, 2026 | Eric C. Scroggins | Exercise M | 36 | — |
| Feb 22, 2026 | Eric C. Scroggins | Exercise M | 927 | — |
| Feb 22, 2026 | Frederick G Bohley | Exercise M | 119 | $0 |
| Feb 22, 2026 | Frederick G Bohley | Exercise M | 2.9K | $0 |
| Feb 22, 2026 | Frederick G Bohley | Other F | 1.3K | $153.8K |
| Feb 22, 2026 | Frederick G Bohley | Exercise M | 119 | — |
| Feb 22, 2026 | Frederick G Bohley | Exercise M | 2.9K | — |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 561 | $0 |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 13.4K | $0 |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 240 | $0 |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 10.5K | $0 |
| Feb 22, 2026 | David S. Graziosi KEY | Other F | 10.5K | $1.2M |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 561 | — |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 13.4K | — |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 240 | — |
| Feb 22, 2026 | David S. Graziosi KEY | Exercise M | 10.5K | — |
| Feb 21, 2026 | Eric C. Scroggins | Exercise M | 15 | $0 |
| Feb 21, 2026 | Eric C. Scroggins | Exercise M | 740 | $0 |
| Feb 21, 2026 | Eric C. Scroggins | Other F | 258 | $30.7K |
| Feb 21, 2026 | Eric C. Scroggins | Exercise M | 15 | — |
| Feb 21, 2026 | Eric C. Scroggins | Exercise M | 740 | — |
| Feb 21, 2026 | Frederick G Bohley | Exercise M | 50 | $0 |
| Feb 21, 2026 | Frederick G Bohley | Exercise M | 2.2K | $0 |
| Feb 21, 2026 | Frederick G Bohley | Other F | 960 | $114.1K |
| Feb 21, 2026 | Frederick G Bohley | Exercise M | 50 | — |
| Feb 21, 2026 | Frederick G Bohley | Exercise M | 2.2K | — |
| Feb 19, 2026 | David S. Graziosi KEY | Exercise M | 67 | $0 |
| Feb 19, 2026 | David S. Graziosi KEY | Exercise M | 6.0K | $0 |
| Feb 19, 2026 | David S. Graziosi KEY | Other F | 1.8K | $208.6K |
| Feb 19, 2026 | David S. Graziosi KEY | Grant A | 67 | — |
| Feb 19, 2026 | David S. Graziosi KEY | Grant A | 6.0K | — |
| Feb 19, 2026 | Eric C. Scroggins | Exercise M | 4 | $0 |
| Feb 19, 2026 | Eric C. Scroggins | Exercise M | 416 | $0 |
| Feb 19, 2026 | Eric C. Scroggins | Other F | 147 | $17.3K |
| Feb 19, 2026 | Eric C. Scroggins | Grant A | 4 | — |
| Feb 19, 2026 | Eric C. Scroggins | Grant A | 416 | — |
| Feb 19, 2026 | Frederick G Bohley | Exercise M | 17 | $0 |
| Feb 19, 2026 | Frederick G Bohley | Exercise M | 1.6K | $0 |
| Feb 19, 2026 | Frederick G Bohley | Other F | 664 | $78.2K |
| Feb 19, 2026 | Frederick G Bohley | Grant A | 17 | — |
| Feb 19, 2026 | Frederick G Bohley | Grant A | 1.6K | — |
| Feb 13, 2026 | Frederick G Bohley 10b5-1 | Exercise M | 10.3K | $0 |
| Feb 13, 2026 | Frederick G Bohley 10b5-1 | Sell S | 4.7K | $551.4K |
| Feb 13, 2026 | Frederick G Bohley 10b5-1 | Sell S | 4.5K | $522.9K |
| Feb 13, 2026 | Frederick G Bohley 10b5-1 | Sell S | 1.1K | $130.2K |
| Feb 13, 2026 | Frederick G Bohley 10b5-1 | Exercise M | 10.3K | $244.1K |
| Feb 11, 2026 | David S. Graziosi KEY | Grant A | 78.9K | $0 |
| Feb 11, 2026 | Frederick G Bohley | Grant A | 17.1K | $0 |
| Feb 11, 2026 | Eric C. Scroggins | Grant A | 5.4K | $0 |
| Feb 6, 2026 | Philip J Christman | Grant A | 102 | $0 |
| Feb 6, 2026 | Scott D. Barbour | Grant A | 102 | $0 |
| Jan 1, 2026 | Craig C Price KEY | Grant A | 11.4K | $0 |
| Dec 31, 2025 | John Coll 10b5-1 | Sell S | 1.8K | $176.9K |
About ALSN insider trading
This page tracks insider transactions for Allison Transmission Holdings Inc (ALSN) 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.