Insider trading

Period: 120 months Stock: ALRM Role: CEO × + Add filter Clear all
Views & alerts

Save your view. Keep the filter you have built, and get an email when a new filing matches it. A free account does both.

When

Period

How far back the list reaches. Filings arrive days after the trade, so the newest rows always lag a little.

80 decisions over 120 months
Who

Role

The position the person holds at the company, read from the title on the filing. A chief executive who is also a director counts as the chief executive.

80 decisions over 120 months Remove this filter
The trade

Type of trade

Purchases, sales, or cluster buys: companies where 3 or more insiders bought within 30 days. The number beside each is what that choice would give.

80 decisions over 120 months
The trade

Minimum amount

Hides rows under this value. The amount is the shares traded times the price on the filing.

80 decisions over 120 months
The trade

Plan

  • Discretionary: they chose to sell that week.
  • Scheduled: a 10b5-1 plan fixed the sale months in advance, so the timing says nothing about what they knew.
  • Not stated: filed before the SEC added the box in April 2023, which is most of the older half of this database.
80 decisions over 120 months
The trade

Share of their own holding

How much of what they already held the trade moved. Selling a tenth of a stake is not the same act as selling all of it.

At least
80 decisions over 120 months
Ownership

What the chief executive holds

The value of the chief executive’s stock measured against base salary. The salary comes from the company’s own proxy. Companies with no figure are in neither direction.

80 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
24 Aug 2026
Trundle Stephen Chief Executive Officer
Sold on a plan
$2.88M 50,000 at 57.67
13.3%
Planned (10b5-1)
26 May 2026
Trundle Stephen Chief Executive Officer
Sold on a plan
$265.88K 6,073 at 43.78
1.8%
Planned (10b5-1)
18 May 2026
Trundle Stephen Chief Executive Officer
Sold on a plan
$128.24K 2,944 at 43.56
0.9%
Planned (10b5-1)
20 Nov 2025
Trundle Stephen Chief Executive Officer · indirect
Bought 2×
$480.66K 10,000 at 48.07
0.8%
19 Nov 2025
Trundle Stephen Chief Executive Officer · indirect
Bought
$605.12K 12,469 at 48.53
1.0%
Largest buy in 3 yrs
18 Nov 2025
Trundle Stephen Chief Executive Officer · indirect
Bought
$171.50K 3,531 at 48.57
0.3%
First buy on file
23 May 2025
Trundle Stephen Chief Executive Officer
Sold on a plan
$206.47K 3,644 at 56.66
1.3%
Planned (10b5-1)
16 May 2025
Trundle Stephen Chief Executive Officer
Sold on a plan
$215.78K 3,626 at 59.51
1.4%
Planned (10b5-1)
2 Apr 2025
Trundle Stephen Chief Executive Officer
Sold on a plan
$86.18K 1,553 at 55.49
0.6%
Planned (10b5-1)
10 Dec 2024
Trundle Stephen Chief Executive Officer
Sold at will 2×
$3.24M 47,500 at 68.18
15.8%
Not planned
2 Apr 2024
Trundle Stephen Chief Executive Officer
Sold on a plan
$225.19K 3,217 at 70.00
1.4%
Planned (10b5-1)
23 Feb 2024
Trundle Stephen Chief Executive Officer · indirect
Sold on a plan 2×
$3.69M 50,000 at 73.80
3.7%
Planned (10b5-1)
16 May 2023
Trundle Stephen Chief Executive Officer
Sold on a plan
$229.16K 4,694 at 48.82
2.1%
Planned (10b5-1)
3 Apr 2023
Trundle Stephen Chief Executive Officer
Sold on a plan 2×
$237.61K 4,787 at 49.64
2.1%
Planned (10b5-1)
16 May 2022
Trundle Stephen President and CEO
Sold, plan not stated 2×
$138.25K 2,392 at 57.80
1.0%
4 Apr 2022
Trundle Stephen President and CEO
Sold, plan not stated
$359.89K 5,305 at 67.84
2.5%
6 Dec 2021
Trundle Stephen President and CEO
Sold, plan not stated 3×
$1.98M 25,000 at 79.11
10.6%
22 Nov 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$1.11M 13,275 at 83.63
0.8%
19 Nov 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$243.18K 2,909 at 83.59
0.2%
18 Nov 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$284.43K 3,410 at 83.41
0.2%
17 Nov 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$667.19K 7,881 at 84.66
0.5%
16 Nov 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$1.89M 22,425 at 84.46
1.4%
15 Nov 2021
Trundle Stephen President and CEO
Sold, plan not stated
$873.15K 10,477 at 83.34
4.1%
15 Nov 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$8.52K 100 at 85.15
0.0%
12 Nov 2021
Trundle Stephen President and CEO
Sold, plan not stated
$1.25M 14,653 at 85.59
5.4%
11 Nov 2021
Trundle Stephen President and CEO
Sold, plan not stated
$616.33K 7,222 at 85.34
2.6%
9 Nov 2021
Trundle Stephen President and CEO
Sold, plan not stated
$90.19K 1,000 at 90.19
0.4%
11 Oct 2021
Trundle Stephen President and CEO
Sold, plan not stated
$1.94M 25,000 at 77.66
8.6%
19 Aug 2021
Trundle Stephen President and CEO
Sold, plan not stated 2×
$1.93M 25,000 at 77.24
8.6%
7 Jun 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$930.65K 11,575 at 80.40
4.3%
4 Jun 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$672.32K 8,425 at 79.80
3.0%
2 Jun 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$546.04K 6,655 at 82.05
0.4%
1 Jun 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$1.72M 21,063 at 81.79
1.3%
28 May 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$1.03M 12,561 at 81.97
0.7%
14 May 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$1.16M 14,087 at 82.29
0.8%
11 May 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$1.28M 15,251 at 84.18
0.9%
7 May 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 3×
$2.61M 30,383 at 85.75
1.7%
22 Apr 2021
Trundle Stephen President and CEO
Sold, plan not stated 3×
$1.80M 20,000 at 90.23
7.7%
5 Apr 2021
Trundle Stephen President and CEO
Sold, plan not stated 2×
$622.67K 7,125 at 87.39
2.9%
15 Jan 2021
Trundle Stephen President and CEO
Sold, plan not stated 3×
$1.48M 15,000 at 98.79
5.5%
18 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$1.65M 23,361 at 70.81
1.3%
17 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$2.05M 29,139 at 70.20
1.6%
16 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$997.03K 14,221 at 70.11
0.8%
13 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$2.42M 34,585 at 70.11
1.9%
12 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$335.59K 4,724 at 71.04
0.3%
11 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 3×
$3.50M 49,122 at 71.25
2.6%
10 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated
$345.47K 4,848 at 71.26
0.3%
9 Nov 2020
Trundle Stephen President and CEO
Sold, plan not stated 3×
$1.13M 15,000 at 75.08
5.5%
25 Aug 2020
Trundle Stephen President and CEO
Sold, plan not stated 2×
$884.74K 15,000 at 58.98
5.5%
24 Aug 2020
Trundle Stephen President and CEO
Sold, plan not stated
$586.60K 10,000 at 58.66
3.7%
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