Updated Jul 16, 2026 · Last SEC filing 2026-07-02
MINERALS TECHNOLOGIES INC (MTX) has filed 17 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-02. 25 Form 8-K material event filings were reported by MTX in the last 90 days. 4 Form 144 notices of proposed sale were filed for MTX stock. InsiderAlpha tracks every MTX SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Industrial Inorganic Chemicals (SIC 2810) |
|---|---|
| SEC CIK | 0000891014 |
| Form 4 filings (90d) | 17 |
|---|---|
| Form 8-K filings (90d) | 25 |
| Form 144 notices (90d) | 4 |
| Latest Form 4 filing | 2026-07-02 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| DIETRICH DOUGLAS T | CHAIRMAN AND CEO | S — Open-market sale | 21.6K | $81.53 | $1.76M | SEC | |
| DIETRICH DOUGLAS T | CHAIRMAN AND CEO | M — Option exercise | 21.6K | $78.03 | $1.68M | SEC | |
| JORDAN TIMOTHY | Vice President | S — Open-market sale | 6.0K | $80.27 | $482K | SEC | |
| DIETRICH DOUGLAS T | CHAIRMAN AND CEO | F — Tax withholding / forfeiture | 6.2K | $68.89 | $424K | SEC | |
| CIPOLLA MICHAEL | VICE PRESIDENT | F — Tax withholding / forfeiture | 660 | $68.89 | $45K | SEC | |
| DIETRICH DOUGLAS T | CHAIRMAN AND CEO | M — Option exercise | 11.1K | $0.00 | — | SEC | |
| ARGIRAKIS BRETT | Group President | M — Option exercise | 2.7K | $0.00 | — | SEC | |
| JORDAN TIMOTHY | Vice President | M — Option exercise | 1.9K | $0.00 | — | SEC | |
| ALDAG ERIK | SVP FINANCE AND TREASURY, CFO | F — Tax withholding / forfeiture | 1.0K | $68.89 | $70K | SEC | |
| Hastings Jonathan J | Senior Vice President | F — Tax withholding / forfeiture | 1.3K | $68.89 | $91K | SEC | |
| JORDAN TIMOTHY | Vice President | F — Tax withholding / forfeiture | 981 | $68.89 | $68K | SEC | |
| CIPOLLA MICHAEL | VICE PRESIDENT | M — Option exercise | 1.3K | $0.00 | — | SEC | |
| MONAGLE DJ III | Group President | M — Option exercise | 3.5K | $0.00 | — | SEC | |
| MONAGLE DJ III | Group President | F — Tax withholding / forfeiture | 1.9K | $68.89 | $134K | SEC | |
| ALDAG ERIK | SVP FINANCE AND TREASURY, CFO | M — Option exercise | 1.8K | $0.00 | — | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for MINERALS TECHNOLOGIES INC (MTX). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| PITTMAN CAROLYN K | 3 | — |
| DIETRICH DOUGLAS T | 3 | $3.44M |
| CARMOLA JOHN J | 2 | — |
| Breunig Joseph C. | 2 | — |
| ROBINSON MARC E | 2 | — |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in MTX insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
Open the live MTX dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.