| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Chairman and CEO | Director | Chairman and CEO +2 more
2 companies
Douglas T Dietrich is Chairman and CEO at MTX, with reported holdings spanning 2 companies. Douglas T Dietrich's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $11.2M at current prices.
Our model assigns Douglas T Dietrich a middling insider score of 64/100, based on 6 past trades. Over a 12-month horizon, 80.0% of those trades were profitable, with an average 12-month return of +17.2%.
Douglas T Dietrich's largest disclosed position is in MTX as Chairman and CEO, worth about $11.2M. The MTX filings lean toward selling, a net 108,988 shares.
Douglas T Dietrich has 52 Form 4 filings on record from January 2018 to August 2026, across 2 companies: Director at Kennametal (KMT), 2025–2026; Chairman and CEO at Minerals Technologies (MTX), 2018–2026.
The 107 reported transactions were 37 option exercises, 30 option or other derivative awards, 28 tax withholdings and 9 open-market sales, plus smaller numbers of other types.
Counted by filing, the open-market trades come to 3 purchases worth about $224K and 6 sales worth about $8.4M.
The largest open-market purchase was 2,000 shares of MTX at an average $51.56 on April 30, 2025, about $103K. Twelve months later MTX was up 39%.
The largest open-market sale was 36,988 shares of MTX at an average $84.40 on May 29, 2024, about $3.1M. Twelve months later MTX was down 31%.
None of the 3 sales since April 2023 was marked as made under a Rule 10b5-1 trading plan.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| May 14, 2026 | MTX Minerals Technologies Inc. | Chairman and CEO | Sale+OE | 21,568 | $81.53 | $1,758,421.79 | -10.9% | -10.3% | - | |
| Apr 30, 2025 | MTX Minerals Technologies Inc | Chairman and CEO | Buy | 2,000 | $51.56 | $103,120.00 | +1.3% | +16.2% | +39.4% | |
| May 29, 2024 | MTX Minerals Technologies Inc | Chairman and CEO | Sale+OE | 36,988 | $84.40 | $3,121,741.46 | -20.3% | -10.1% | -31.3% | |
| Dec 7, 2023 | MTX Minerals Technologies Inc | Chairman and CEO | Sale+OE | 13,662 | $63.40 | $866,166.70 | -9.4% | +12.5% | +24.5% | |
| Sep 8, 2022 | MTX Minerals Technologies Inc | Chairman and CEO | Sale+OE | 16,299 | $60.06 | $978,873.93 | -12.1% | +1.4% | -9.1% | |
| Feb 25, 2021 | MTX Minerals Technologies Inc | Chief Executive Officer | Sale+OE | 13,615 | $72.48 | $986,871.54 | -11.8% | - | - | |
| Nov 9, 2020 | MTX Minerals Technologies Inc | Chief Executive Officer | Sale+OE | 11,856 | $61.46 | $728,634.19 | -12.2% | - | - | |
| Mar 27, 2020 | MTX Minerals Technologies Inc | Chief Executive Officer | Buy | 1,500 | $32.75 | $49,119.00 | +1.9% | - | - | |
| Aug 29, 2019 | MTX Minerals Technologies Inc | Chief Executive Officer | Buy | 1,500 | $47.99 | $71,983.50 | +2.1% | - | - |