Insider trading

Period: 120 months Stock: MTX Plan: Discretionary × + 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 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
25 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.

25 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
11 May 2026
JORDAN TIMOTHY Vice President
Sold at will
$481.65K 6,000 at 80.27
82.4%
Sold half or more
29 Dec 2025
MONAGLE DJ III Group President
Sold at will
$1.43M 23,093 at 61.90
21.5%
Not planned
21 Nov 2025
ARGIRAKIS BRETT Group President
Sold at will
$381.46K 6,501 at 58.68
19.1%
Not planned
16 Jun 2025
Motwani Rocky Director
Bought
$20.09K 370 at 54.31
45.0%
+45% of stake
2 May 2025
Bought
$53.79K 1,000 at 53.79
250%
Largest buy in 3 yrs
30 Apr 2025
DIETRICH DOUGLAS T CHAIRMAN AND CEO
Bought
$103.12K 2,000 at 51.56
1.3%
First buy on file
30 Apr 2025
ALDAG ERIK SVP FINANCE AND TREASURY, CFO
Bought
$50.37K 1,000 at 50.37
30.8%
First buy on file
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
17 Jun 2024
ARGIRAKIS BRETT Group President
Sold at will
$189.64K 2,259 at 83.95
8.9%
Not planned
12 Jun 2024
Hastings Jonathan J Senior Vice President
Sold at will 2×
$765.68K 8,964 at 85.42
14.3%
Not planned
3 Jun 2024
CUTLER ERIN VP, Human Resources
Sold at will
$19.39K 225 at 86.16
5.6%
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
21 May 2024
Hastings Jonathan J Senior Vice President
Sold at will
$649.60K 7,814 at 83.13
12.7%
Not planned
16 May 2024
Bought
$32.37K 400 at 80.92
opened
First buy on file
22 Mar 2024
MONAGLE DJ III Group President
Sold at will
$87.46K 1,180 at 74.12
1.4%
Not planned
20 Feb 2024
Hastings Jonathan J Senior Vice President
Sold at will
$923.64K 12,922 at 71.48
19.3%
Not planned
20 Dec 2023
MONAGLE DJ III Group President
Sold at will 2×
$993.80K 14,598 at 68.08
16.0%
Not planned
14 Dec 2023
ARGIRAKIS BRETT Group President
Sold at will
$177.46K 2,655 at 66.84
12.3%
Not planned
7 Dec 2023
DIETRICH DOUGLAS T Chairman and CEO
Sold at will
$866.17K 13,662 at 63.40
9.4%
Not planned
7 Dec 2023
CIPOLLA MICHAEL VICE PRESIDENT
Sold at will
$305.28K 4,818 at 63.36
12.4%
Not planned
30 Nov 2023
Hastings Jonathan J Senior Vice President
Sold at will
$559.46K 8,960 at 62.44
15.4%
Not planned
Showing 1–25 of 25.