Insider trading

Period: 120 months Stock: ALRM Minimum amount: $1M × + 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.

69 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.

69 decisions over 120 months
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.

69 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.

69 decisions over 120 months Remove this filter
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.
69 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
69 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.

69 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)
18 Mar 2026
NEVIN DARIUS G Director
Sold on a plan
$1.66M 36,000 at 46.17
59.6%
Sold half or more
16 Dec 2025
BEDELL JEFFREY A See Remarks
Sold at will
$1.18M 22,727 at 51.82
4.3%
Not planned
12 Nov 2025
Kerzner Daniel See Remarks
Sold at will
$1.01M 20,004 at 50.29
27.8%
Not planned
13 Dec 2024
Kerzner Daniel See Remarks
Sold at will
$2.18M 32,851 at 66.40
35.5%
Not planned
10 Dec 2024
Trundle Stephen Chief Executive Officer
Sold at will 2×
$3.24M 47,500 at 68.18
15.8%
Not planned
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)
15 Feb 2024
Kerzner Daniel See Remarks
Sold on a plan 3×
$1.99M 28,433 at 69.98
33.1%
Planned (10b5-1)
8 Mar 2023
BEDELL JEFFREY A See Remarks
Sold, plan not stated
$3.20M 63,787 at 50.18
12.0%
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%
16 Nov 2021
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$1.89M 22,425 at 84.46
1.4%
12 Nov 2021
Trundle Stephen President and CEO
Sold, plan not stated
$1.25M 14,653 at 85.59
5.4%
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%
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%
17 Mar 2021
BEDELL JEFFREY A Chief Strategy & Innovation
Sold, plan not stated 3×
$1.08M 12,200 at 88.55
2.7%
15 Mar 2021
Clarke Donald E Director
Sold, plan not stated 2×
$1.17M 13,161 at 88.60
39.3%
15 Jan 2021
Trundle Stephen President and CEO
Sold, plan not stated 3×
$1.48M 15,000 at 98.79
5.5%
25 Nov 2020
Clarke Donald E Director
Sold, plan not stated
$1.09M 15,000 at 72.74
35.3%
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%
13 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 2×
$2.42M 34,585 at 70.11
1.9%
11 Nov 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 3×
$3.50M 49,122 at 71.25
2.6%
9 Nov 2020
Trundle Stephen President and CEO
Sold, plan not stated 3×
$1.13M 15,000 at 75.08
5.5%
28 Jul 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 3×
$6.58M 98,237 at 67.02
4.9%
27 Jul 2020
Trundle Stephen President and CEO · indirect
Sold, plan not stated 3×
$6.87M 101,763 at 67.52
4.8%
1 Jul 2020
Kerzner Daniel Chief Product Officer
Sold, plan not stated 3×
$2.27M 34,473 at 65.80
42.9%
9 Jun 2020
PANERO HUGH Director
Sold, plan not stated
$1.17M 20,000 at 58.59
66.4%
Sold half or more
22 May 2020
Sold, plan not stated
$172.85M 3,673,816 at 47.05
100%
Sold half or more
22 May 2020
Sold, plan not stated
$89.77M 1,907,898 at 47.05
100%
Sold half or more
22 May 2020
Sold, plan not stated
$1.63M 34,737 at 47.05
100%
Sold half or more
8 Apr 2020
Trundle Stephen President and CEO
Sold, plan not stated 2×
$1.45M 35,000 at 41.33
12.0%
5 Mar 2020
REYNOLDS JON Q JR 10% owner · indirect
Sold, plan not stated
$3.31M 72,000 at 45.94
33.6%
5 Mar 2020
REYNOLDS JON Q JR 10% owner · indirect
Sold, plan not stated
$1.17M 25,510 at 46.00
100%
Sold half or more
4 Mar 2020
TCV VII LP 10% owner · indirect
Sold, plan not stated 3×
$3.16M 68,985 at 45.80
100%
Sold half or more
22 Apr 2019
Trundle Stephen President and CEO
Sold, plan not stated
$1.35M 20,000 at 67.63
8.2%
14 Jan 2019
Trundle Stephen President and CEO
Sold, plan not stated
$1.04M 18,800 at 55.11
8.6%
15 Nov 2018
McAdam Timothy P Director · indirect
Sold, plan not stated
$1.08M 22,500 at 47.82
40.0%
12 Sep 2018
Ramos Daniel Sr. VP-Corporate Development
Sold, plan not stated
$1.09M 19,178 at 56.88
44.3%
10 Sep 2018
Ramos Daniel Sr. VP-Corporate Development
Sold, plan not stated
$2.84M 50,399 at 56.31
52.8%
Sold half or more
7 Sep 2018
Sold, plan not stated 2×
$2.85M 51,348 at 55.52
100%
Sold half or more
7 Sep 2018
Sold, plan not stated 2×
$1.75M 31,434 at 55.52
100%
Sold half or more
6 Sep 2018
Sold, plan not stated 5×
$4.27M 77,781 at 54.91
94.0%
Sold half or more
13 Jun 2018
TCV VII LP 10% owner · indirect
Sold, plan not stated
$1.93M 43,295 at 44.57
100%
Sold half or more
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