Insider trading

Period: 120 months Stock: MASS Plan: Not on a plan × + 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.

146 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.

146 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.

146 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.

146 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.
146 decisions over 120 months Remove this filter
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
146 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.

146 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
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
23 Sep 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$11.25K 1,000 at 11.25
0.0%
Not planned
21 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$441.16K 41,578 at 10.61
0.9%
Not planned
20 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$88.64K 8,422 at 10.52
0.2%
Not planned
4 Aug 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$417.77K 50,000 at 8.36
1.0%
Not planned
23 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$27.46K 3,050 at 9.00
0.1%
Not planned
22 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$41.97K 4,668 at 8.99
0.1%
Not planned
4 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$356.86K 39,782 at 8.97
0.8%
Not planned
2 Jun 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$22.38K 2,500 at 8.95
0.1%
Not planned
28 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$1.48M 170,442 at 8.66
3.3%
Not planned
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
11 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$41.26K 5,000 at 8.25
0.1%
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
8 May 2026
AWM Investment Company, Inc. 10% owner · indirect
Sold at will
$24.81K 3,025 at 8.20
0.1%
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
1 May 2026
Kenneweg John SVP, Sales & Product Marketing
Sold at will
$53.19K 7,787 at 6.83
9.3%
Not planned
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
18 Jun 2025
Turner Michael S. Chief Legal & Admin Officer
Sold at will
$10.30K 1,373 at 7.50
100%
Sold half or more
17 Jun 2025
Turner Michael S. Chief Legal & Admin Officer
Sold at will
$53.65K 7,148 at 7.51
83.9%
Sold half or more
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
4 Jun 2025
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$49.14K 6,940 at 7.08
6.3%
Not planned
15 May 2025
Knopp Kevin J. President and CEO
Bought
$66.60K 15,000 at 4.44
2.1%
Largest buy in 3 yrs
14 May 2025
Knopp Kevin J. President and CEO
Bought
$64.79K 15,000 at 4.32
2.2%
Largest buy in 3 yrs
14 May 2025
Spoto Mark Director
Bought 2×
$42.85K 10,000 at 4.29
18.9%
Largest buy in 3 yrs
3 Feb 2025
Knopp Kevin J. President and CEO
Sold at will 3×
$37.11K 16,001 at 2.32
2.3%
Not planned
3 Feb 2025
Griffith Joseph H. IV Chief Financial Officer
Sold at will 3×
$23.98K 10,236 at 2.34
8.5%
Not planned
3 Feb 2025
Turner Michael S. Chief Legal & Admin Officer
Sold at will 3×
$22.50K 9,672 at 2.33
28.2%
Not planned
3 Feb 2025
Brown Christopher D. Chief Product Officer
Sold at will 3×
$18.19K 7,767 at 2.34
0.8%
Not planned
13 May 2024
Knopp Kevin J. President and CEO
Bought
$64.20K 10,000 at 6.42
2.0%
Largest buy in 3 yrs
10 May 2024
Knopp Kevin J. President and CEO
Bought
$57.70K 10,000 at 5.77
2.0%
9 May 2024
Knopp Kevin J. President and CEO
Bought
$58.30K 10,000 at 5.83
2.1%
Largest buy in 3 yrs
8 May 2024
Knopp Kevin J. President and CEO
Bought
$57.20K 10,000 at 5.72
2.1%
Largest buy in 3 yrs
7 May 2024
Knopp Kevin J. President and CEO
Bought
$56.00K 10,000 at 5.60
2.2%
First buy on file
2 Feb 2024
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$68.87K 9,711 at 7.09
10.8%
Not planned
1 Feb 2024
Knopp Kevin J. President and CEO
Sold at will 2×
$63.46K 9,071 at 7.00
2.2%
Not planned
1 Feb 2024
Griffith Joseph H. IV Chief Financial Officer
Sold at will 2×
$39.89K 5,698 at 7.00
6.0%
Not planned
1 Feb 2024
Turner Michael S. Chief Legal & Admin Officer
Sold at will 2×
$36.56K 5,232 at 6.99
36.5%
Not planned
1 Feb 2024
Brown Christopher D. Chief Product Officer
Sold at will 2×
$27.73K 3,957 at 7.01
0.4%
Not planned
28 Dec 2023
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$72.48K 6,000 at 12.08
7.0%
Not planned
21 Dec 2023
Brown Christopher D. Chief Product Officer
Sold at will
$67.21K 7,370 at 9.12
0.8%
Not planned
20 Dec 2023
Brown Christopher D. Chief Product Officer
Sold at will
$47.64K 5,235 at 9.10
0.6%
Not planned
19 Dec 2023
Brown Christopher D. Chief Product Officer
Sold at will 2×
$67.15K 7,395 at 9.08
0.8%
Not planned
19 Dec 2023
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$50.67K 5,580 at 9.08
6.1%
Not planned
16 Feb 2023
Knopp Kevin J. President and CEO
Sold, plan not stated
$49.00K 4,842 at 10.12
1.1%
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%
Showing 1–50 of 146. Page 1 of 3 Older →