Insider trading

Period: 120 months Stock: MTX 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.

12 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.

12 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.

12 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.

12 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.
12 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
12 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.

12 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
14 May 2026
DIETRICH DOUGLAS T CHAIRMAN AND CEO
Sold at will
$1.76M 21,568 at 81.53
10.9%
Not planned
29 Dec 2025
MONAGLE DJ III Group President
Sold at will
$1.43M 23,093 at 61.90
21.5%
Not planned
24 Jun 2024
MONAGLE DJ III Group President
Sold at will
$1.19M 14,229 at 83.63
15.1%
Not planned
18 Jun 2024
Hastings Jonathan J Senior Vice President
Sold at will
$1.82M 21,543 at 84.35
28.6%
Not planned
29 May 2024
DIETRICH DOUGLAS T Chairman and CEO
Sold at will
$2.10M 24,978 at 84.18
14.6%
Not planned
28 May 2024
DIETRICH DOUGLAS T Chairman and CEO
Sold at will
$1.02M 12,010 at 84.85
7.6%
Not planned
28 May 2024
CIPOLLA MICHAEL VICE PRESIDENT
Sold at will
$1.01M 11,958 at 84.36
25.0%
Not planned
2 Dec 2022
Meek Thomas J Senior Vice President
Sold, plan not stated 2×
$1.05M 16,795 at 62.52
16.7%
12 Sep 2022
MONAGLE DJ III Group President
Sold, plan not stated
$1.25M 19,673 at 63.36
21.4%
15 Dec 2021
Meek Thomas J Senior Vice President
Sold, plan not stated 3×
$1.19M 16,814 at 71.05
17.8%
16 Feb 2021
MAYGER DOUGLAS W Senior Vice President
Sold, plan not stated
$1.67M 24,500 at 68.36
36.5%
25 Sep 2017
MONAGLE DJ III Senior Vice President
Sold, plan not stated
$1.40M 19,926 at 70.03
33.5%
Showing 1–12 of 12.