Insider trading

Period: 120 months Stock: MASS Minimum amount: $100K × + 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.

105 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.

105 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.

105 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.

105 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.
105 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
105 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.

105 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
7 Oct 2026
Sold on a plan
$356.70K 30,000 at 11.89
3.9%
Planned (10b5-1)
29 Sep 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$207.32K 18,000 at 11.52
0.4%
Not planned
24 Sep 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$272.63K 24,000 at 11.36
0.5%
Not planned
16 Sep 2026
Kenneweg John SVP, Sales & Product Marketing
Sold on a plan
$216.34K 21,399 at 10.11
27.0%
Planned (10b5-1)
2 Sep 2026
Sold on a plan
$317.40K 30,000 at 10.58
3.7%
Planned (10b5-1)
25 Aug 2026
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$125.48K 11,459 at 10.95
8.6%
Planned (10b5-1)
21 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$441.16K 41,578 at 10.61
0.9%
Not planned
17 Aug 2026
Knopp Kevin J. President and CEO
Sold on a plan
$207.00K 20,000 at 10.35
3.5%
Planned (10b5-1)
11 Aug 2026
Knopp Kevin J. President and CEO
Sold on a plan 2×
$1.44M 145,918 at 9.90
19.9%
Planned (10b5-1)
5 Aug 2026
Sold on a plan
$169.80K 20,000 at 8.49
2.4%
Planned (10b5-1)
4 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$417.77K 50,000 at 8.36
1.0%
Not planned
30 Jun 2026
Sold on a plan
$176.80K 20,000 at 8.84
2.3%
Planned (10b5-1)
25 Jun 2026
Knopp Kevin J. President and CEO
Sold on a plan
$149.13K 16,388 at 9.10
2.2%
Planned (10b5-1)
24 Jun 2026
Knopp Kevin J. President and CEO
Sold on a plan
$370.49K 40,535 at 9.14
5.1%
Planned (10b5-1)
4 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$356.86K 39,782 at 8.97
0.8%
Not planned
3 Jun 2026
Sold on a plan
$174.60K 20,000 at 8.73
2.2%
Planned (10b5-1)
28 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$1.48M 170,442 at 8.66
3.3%
Not planned
28 May 2026
Sold on a plan
$270.00K 30,000 at 9.00
3.2%
Planned (10b5-1)
27 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will 2×
$136.17K 16,500 at 8.25
0.3%
Not planned
8 May 2026
Kenneweg John SVP, Sales & Product Marketing
Sold at will
$148.05K 18,255 at 8.11
24.0%
Not planned
7 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$105.17K 12,819 at 8.20
0.2%
Not planned
6 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will 2×
$502.16K 62,365 at 8.05
1.2%
Not planned
6 May 2026
Sold on a plan
$144.60K 20,000 at 7.23
2.1%
Planned (10b5-1)
10 Apr 2026
Sold on a plan
$124.28K 17,578 at 7.07
1.8%
Planned (10b5-1)
8 Apr 2026
McCallion Kevin J. SVP, Products and Production
Sold on a plan
$130.99K 18,580 at 7.05
29.3%
Planned (10b5-1)
8 Apr 2026
Sold on a plan
$105.96K 15,030 at 7.05
1.5%
Planned (10b5-1)
2 Feb 2026
Knopp Kevin J. President and CEO
Sold at will
$214.84K 34,764 at 6.18
4.2%
Not planned
2 Feb 2026
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$143.22K 23,175 at 6.18
14.2%
Not planned
16 Jun 2025
Turner Michael S. Chief Legal & Admin Officer
Sold at will
$120.84K 16,082 at 7.51
65.4%
Sold half or more
23 May 2023
Knopp Kevin J. President and CEO
Sold on a plan
$607.20K 60,000 at 10.12
14.0%
Planned (10b5-1)
23 May 2023
Brown Christopher D. Chief Technology Officer
Sold on a plan
$100.20K 10,000 at 10.02
1.1%
Planned (10b5-1)
15 Feb 2023
Knopp Kevin J. President and CEO
Sold, plan not stated
$155.98K 15,158 at 10.29
3.4%
2 Feb 2023
Knopp Kevin J. President and CEO
Sold, plan not stated
$420.40K 40,000 at 10.51
8.2%
2 Feb 2023
Brown Christopher D. Chief Technology Officer
Sold, plan not stated
$100.30K 10,000 at 10.03
1.1%
15 Nov 2022
Knopp Kevin J. President and CEO
Sold, plan not stated 3×
$220.76K 20,000 at 11.04
4.0%
18 Oct 2022
Knopp Kevin J. President and CEO
Sold, plan not stated
$288.02K 18,800 at 15.32
3.6%
17 Oct 2022
Knopp Kevin J. President and CEO
Sold, plan not stated
$164.42K 11,200 at 14.68
2.1%
15 Sep 2022
Knopp Kevin J. President and CEO
Sold, plan not stated
$508.20K 30,000 at 16.94
5.4%
12 Sep 2022
Brown Christopher D. Chief Technology Officer
Sold, plan not stated
$391.60K 20,000 at 19.58
2.2%
15 Aug 2022
Knopp Kevin J. President and CEO
Sold, plan not stated 2×
$578.06K 30,000 at 19.27
5.1%
5 Aug 2022
Knopp Kevin J. President and CEO
Sold, plan not stated
$656.04K 25,910 at 25.32
4.2%
4 Aug 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$310.56K 12,733 at 24.39
12.2%
2 Aug 2022
Turner Michael S. VP, General Counsel
Sold, plan not stated
$239.60K 10,000 at 23.96
100%
Sold half or more
1 Aug 2022
Knopp Kevin J. President and CEO
Sold, plan not stated
$328.97K 14,647 at 22.46
2.3%
29 Jul 2022
Knopp Kevin J. President and CEO
Sold, plan not stated
$399.96K 18,000 at 22.22
2.8%
28 Jul 2022
Knopp Kevin J. President and CEO
Sold, plan not stated
$125.46K 5,700 at 22.01
0.9%
15 Jul 2022
Knopp Kevin J. President and CEO
Sold, plan not stated 2×
$521.14K 30,000 at 17.37
4.4%
6 Jul 2022
Brown Christopher D. Chief Technology Officer
Sold, plan not stated 2×
$212.77K 10,000 at 21.28
1.1%
29 Jun 2022
Brown Christopher D. Chief Technology Officer
Sold, plan not stated
$333.04K 16,471 at 20.22
1.7%
29 Jun 2022
Turner Michael S. VP, General Counsel
Sold, plan not stated
$100.15K 5,000 at 20.03
100%
Sold half or more
Showing 1–50 of 105. Page 1 of 3 Older →