Insider trading

Period: 120 months Stock: MASS Role: CFO × + 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.

26 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.

26 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.

26 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.

26 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.
26 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
26 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.

26 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
6 Oct 2026
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$65.15K 5,000 at 13.03
4.1%
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)
28 May 2026
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$62.67K 6,940 at 9.03
5.0%
Planned (10b5-1)
2 Feb 2026
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$143.22K 23,175 at 6.18
14.2%
Not planned
3 Oct 2025
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$38.85K 4,292 at 9.05
4.4%
Planned (10b5-1)
2 Oct 2025
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$6.40K 708 at 9.04
0.7%
Planned (10b5-1)
19 Sep 2025
Griffith Joseph H. IV Chief Financial Officer
Sold on a plan
$35.34K 5,000 at 7.07
4.9%
Planned (10b5-1)
4 Jun 2025
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$49.14K 6,940 at 7.08
6.3%
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
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
Griffith Joseph H. IV Chief Financial Officer
Sold at will 2×
$39.89K 5,698 at 7.00
6.0%
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
19 Dec 2023
Griffith Joseph H. IV Chief Financial Officer
Sold at will
$50.67K 5,580 at 9.08
6.1%
Not planned
2 Feb 2023
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$32.76K 3,266 at 10.03
3.4%
1 Feb 2023
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$16.84K 1,836 at 9.17
1.9%
4 Aug 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$310.56K 12,733 at 24.39
12.2%
3 Aug 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$14.57K 600 at 24.29
0.7%
27 Jun 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$96.53K 5,059 at 19.08
5.2%
24 Jun 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$251.16K 13,129 at 19.13
12.5%
21 Jun 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$121.99K 8,100 at 15.06
8.1%
17 Jun 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$13.51K 900 at 15.01
1.0%
15 Jun 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$15.02K 1,000 at 15.02
1.1%
13 Jun 2022
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$180.54K 13,334 at 13.54
12.7%
5 Nov 2021
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$109.42K 2,800 at 39.08
3.1%
8 Sep 2021
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated 4×
$1.88M 49,898 at 37.61
35.3%
16 Jun 2021
Griffith Joseph H. IV Chief Financial Officer
Sold, plan not stated
$700.45K 17,814 at 39.32
16.3%
Showing 1–26 of 26.