Brett Argirakis
CIK 1695302 · View on SEC EDGAR ↗
First SEC filing: Jan. 23, 2017 · Latest: Jan. 27, 2026
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Nov. 21, 2025 | MTX | S | 6,501 | $58.68 | $381,479 | 27,602 Direct | -19.06% | Disposed | 20.4% (price as of 2026-08-20) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Jan. 26, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock (2,672) | — | — | 2,672 | Disposed |
| Jan. 23, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock (3,247) | — | — | 3,247 | Disposed |
| Jan. 21, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock (3,112) | — | — | 3,112 | Disposed |
| Jan. 20, 2026 | MTX | Employee Stock Option (Right to Buy) | Common Stock (10,393) | $66.23 | Jan. 20, 2036 | 10,393 | Acquired |
| Jan. 20, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock (12,101) | — | — | 12,101 | Acquired |
| Nov. 21, 2025 | MTX | EMPLOYEE Stock Option (Right to Buy) | Common Stock (6,501) | $38.28 | Jan. 19, 2026 | 6,501 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 11 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Jan. 23, 2017 | MTX | Common Stock | 2,739 | Direct |
| Jan. 23, 2017 | MTX | Common Stock | 1,073 | Indirect |
| Jan. 23, 2017 | MTX | Employee Stock Option (Right to Buy)→ Common Stock (927) | 927 | Direct |
| Jan. 23, 2017 | MTX | Employee Stock Option (Right to Buy)→ Common Stock (2,655) | 2,655 | Direct |
| Jan. 23, 2017 | MTX | Employee Stock Option (Right to Buy)→ Common Stock (2,630) | 2,630 | Direct |
| Jan. 23, 2017 | MTX | Employee Stock Option (Right to Buy)→ Common Stock (6,501) | 6,501 | Direct |
| Jan. 23, 2017 | MTX | Employee Stock Option (Right to Buy)→ Common Stock (4,271) | 4,271 | Direct |
| Jan. 23, 2017 | MTX | Deferred Restricted Stock Units (DRSUs)→ Common Stock (460) | 460 | Direct |
| Jan. 23, 2017 | MTX | Deferred Restricted Stock Units (DRSUs)→ Common Stock (996) | 996 | Direct |
| Jan. 23, 2017 | MTX | Deferred Restricted Stock Units (DRSUs)→ Common Stock (2,507) | 2,507 | Direct |
| Jan. 23, 2017 | MTX | Deferred Restricted Stock Units (DRSUs)→ Common Stock (2,486) | 2,486 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
MTX
President, Engineered Solutions| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2023 | $597,662 | — | $529,657 | $345,754 | $850,506 | $374,086 | $40,359 | $2,738,024 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.