Insider trading

Period: 120 months Stock: MASS Share of holding: 50% or more × + 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.

25 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.

25 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.

25 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.

25 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.
25 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
25 decisions over 120 months Remove this filter
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.

25 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
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
2 Feb 2023
Turner Michael S. VP, General Counsel
Sold, plan not stated
$28.54K 2,848 at 10.02
100%
Sold half or more
17 Aug 2022
Turner Michael S. VP, General Counsel
Sold, plan not stated
$90.75K 5,000 at 18.15
100%
Sold half or more
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
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
23 Jun 2022
Turner Michael S. VP, General Counsel
Sold, plan not stated
$179.00K 10,000 at 17.90
66.7%
Sold half or more
12 Apr 2022
Kenneweg John Vice President, Government
Sold, plan not stated
$198.29K 9,880 at 20.07
100%
Sold half or more
18 Mar 2022
Kenneweg John Vice President, Government
Sold, plan not stated
$398.81K 19,881 at 20.06
100%
Sold half or more
11 Mar 2022
Kenneweg John Vice President, Government
Sold, plan not stated
$2.38K 119 at 20.00
100%
Sold half or more
11 Jan 2022
Kenneweg John Vice President, Government
Sold, plan not stated
$187.40K 9,300 at 20.15
100%
Sold half or more
10 Jan 2022
Kenneweg John Vice President, Government
Sold, plan not stated
$14.03K 700 at 20.04
100%
Sold half or more
16 Nov 2021
Kenneweg John Vice President, Government
Sold, plan not stated 2×
$303.21K 10,000 at 30.32
100%
Sold half or more
18 Oct 2021
Kenneweg John Vice President, Government
Sold, plan not stated
$322.20K 10,000 at 32.22
100%
Sold half or more
16 Sep 2021
Kenneweg John Vice President, Government
Sold, plan not stated
$366.10K 10,000 at 36.61
100%
Sold half or more
9 Sep 2021
Turner Michael S. VP, General Counsel
Sold, plan not stated 2×
$795.56K 21,848 at 36.41
81.4%
Sold half or more
16 Aug 2021
Kenneweg John Vice President, Government
Sold, plan not stated 2×
$304.52K 10,000 at 30.45
100%
Sold half or more
16 Jul 2021
Kenneweg John Vice President, Government
Sold, plan not stated 3×
$322.67K 10,000 at 32.27
100%
Sold half or more
25 Jun 2021
Basarsky Trent A. VP Corporate Development
Sold, plan not stated
$108.77K 2,726 at 39.90
100%
Sold half or more
24 Jun 2021
Basarsky Trent A. VP Corporate Development
Sold, plan not stated
$363.23K 9,074 at 40.03
100%
Sold half or more
24 Jun 2021
BARTHELEMY NICOLAS VP, Corporate Development
Sold, plan not stated
$160.00K 4,000 at 40.00
100%
Sold half or more
23 Jun 2021
Basarsky Trent A. VP Corporate Development
Sold, plan not stated 2×
$1.19M 30,200 at 39.54
100%
Sold half or more
23 Jun 2021
BARTHELEMY NICOLAS VP, Corporate Development
Sold, plan not stated
$118.59K 3,000 at 39.53
100%
Sold half or more
16 Jun 2021
Kenneweg John Vice President, Government
Sold, plan not stated
$392.70K 10,000 at 39.27
100%
Sold half or more
Showing 1–25 of 25.