As of the latest Form 4 filed May 13, 2026.
What Minerals Technologies Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 51 most recent filings for MTX.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-05-13 | 2026-05-11 | JORDAN TIMOTHY Vice President | SSale | −6.00K | $80.27 | $482K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | DIETRICH DOUGLAS T CHAIRMAN AND CEO | FTax | −6.15K | $68.89 | $424K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | DIETRICH DOUGLAS T, CHAIRMAN AND CEO | MExercise | +11.1K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | CUTLER ERIN VP, Human Resources | FTax | −520.00 | $68.89 | $35.8K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | CUTLER ERIN, VP, Human Resources | MExercise | +1.20K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | CIPOLLA MICHAEL VICE PRESIDENT | FTax | −660.00 | $68.89 | $45.5K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | CIPOLLA MICHAEL, VICE PRESIDENT | MExercise | +1.29K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | ARGIRAKIS BRETT Group President | FTax | −1.16K | $68.89 | $80.1K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | ARGIRAKIS BRETT, Group President | MExercise | +2.67K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | Hastings Jonathan J Senior Vice President | FTax | −1.33K | $68.89 | $91.4K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | Hastings Jonathan J, Senior Vice President | MExercise | +3.05K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | JORDAN TIMOTHY Vice President | FTax | −981.00 | $68.89 | $67.6K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | JORDAN TIMOTHY, Vice President | MExercise | +1.92K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | MONAGLE DJ III Group President | FTax | −1.95K | $68.89 | $134K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | MONAGLE DJ III, Group President | MExercise | +3.52K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | ALDAG ERIK SVP FINANCE AND TREASURY, CFO | FTax | −1.02K | $68.89 | $70.2K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-26 | ALDAG ERIK, SVP FINANCE AND TREASURY, CFO | MExercise | +1.84K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | DIETRICH DOUGLAS T CHAIRMAN AND CEO | FTax | −6.09K | $68.77 | $419K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | DIETRICH DOUGLAS T, CHAIRMAN AND CEO | MExercise | +11.0K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | CUTLER ERIN VP, Human Resources | FTax | −608.00 | $68.77 | $41.8K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | CUTLER ERIN, VP, Human Resources | MExercise | +1.28K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | CIPOLLA MICHAEL VICE PRESIDENT | FTax | −774.00 | $68.77 | $53.2K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | CIPOLLA MICHAEL, VICE PRESIDENT | MExercise | +1.43K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | ARGIRAKIS BRETT Group President | FTax | −1.41K | $68.77 | $97.2K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | ARGIRAKIS BRETT, Group President | MExercise | +3.25K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | Hastings Jonathan J Senior Vice President | FTax | −1.35K | $68.77 | $93.1K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | Hastings Jonathan J, Senior Vice President | MExercise | +3.11K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | JORDAN TIMOTHY Vice President | FTax | −1.06K | $68.77 | $72.8K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | JORDAN TIMOTHY, Vice President | MExercise | +2.05K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | MONAGLE DJ III Group President | FTax | −2.10K | $68.77 | $144K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | MONAGLE DJ III, Group President | MExercise | +3.79K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | ALDAG ERIK SVP FINANCE AND TREASURY, CFO | FTax | −1.24K | $68.77 | $85.3K | No | Form 4 ↗ |
| 2026-01-27 | 2026-01-23 | ALDAG ERIK, SVP FINANCE AND TREASURY, CFO | MExercise | +2.24K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | Hastings Jonathan J Senior Vice President | FTax | −1.32K | $66.92 | $88.2K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | Hastings Jonathan J, Senior Vice President | MExercise | +2.79K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | ALDAG ERIK SVP FINANCE AND TREASURY, CFO | FTax | −1.36K | $66.92 | $90.7K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | ALDAG ERIK, SVP FINANCE AND TREASURY, CFO | MExercise | +2.25K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | ARGIRAKIS BRETT Group President | FTax | −1.46K | $66.92 | $97.5K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | ARGIRAKIS BRETT, Group President | MExercise | +3.11K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | CIPOLLA MICHAEL VICE PRESIDENT | FTax | −731.00 | $66.92 | $48.9K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | CIPOLLA MICHAEL, VICE PRESIDENT | MExercise | +1.29K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | CUTLER ERIN VP, Human Resources | FTax | −583.00 | $66.92 | $39.0K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | CUTLER ERIN, VP, Human Resources | MExercise | +1.19K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | DIETRICH DOUGLAS T CHAIRMAN AND CEO | FTax | −5.63K | $66.92 | $377K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | DIETRICH DOUGLAS T, CHAIRMAN AND CEO | MExercise | +10.0K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | JORDAN TIMOTHY Vice President | FTax | −1.07K | $66.92 | $71.7K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | JORDAN TIMOTHY, Vice President | MExercise | +1.90K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | MONAGLE DJ III Group President | FTax | −2.04K | $66.92 | $136K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-21 | MONAGLE DJ III, Group President | MExercise | +3.49K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2025-12-31 | 2025-12-29 | MONAGLE DJ III Group President | SSale | −23.1K | $61.90 | $1.43M | No | Form 4 ↗ |
| 2025-12-31 | 2025-12-29 | MONAGLE DJ III, Group President | MExercise | +23.1K | $38.29 | $884K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MTX’s full analysis or the market-wide insider trading feed. The tabs above jump to MTX’s other SEC data.
Source: SEC Form 4 filings for MTX, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.