Erin Cutler
Insider
First SEC filing: Aug. 28, 2020 · Latest: Jan. 27, 2026
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
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 |
|---|---|---|---|---|---|---|---|---|---|
| Jan. 26, 2026 | MTX | M | 1,195 | · | · | 8,118 Direct | -12.83% | Disposed | (price as of 2026-10-02) |
| Jan. 26, 2026 | MTX | F | 520 | $68.89 | $35,823 | 7,734 Direct | -6.30% | Disposed | -3.6% (price as of 2026-10-02) |
| Jan. 26, 2026 | MTX | M | 1,195 | · | · | 8,254 Direct | +16.93% | Acquired | (price as of 2026-10-02) |
| Jan. 23, 2026 | MTX | M | 1,276 | · | · | 9,313 Direct | -12.05% | Disposed | (price as of 2026-10-02) |
| Jan. 23, 2026 | MTX | F | 608 | $68.77 | $41,812 | 7,059 Direct | -7.93% | Disposed | -3.4% (price as of 2026-10-02) |
| Jan. 23, 2026 | MTX | M | 1,276 | · | · | 7,667 Direct | +19.97% | Acquired | (price as of 2026-10-02) |
| Jan. 21, 2026 | MTX | M | 1,193 | · | · | 10,589 Direct | -10.13% | Disposed | (price as of 2026-10-02) |
| Jan. 21, 2026 | MTX | F | 583 | $66.92 | $39,014 | 6,391 Direct | -8.36% | Disposed | -0.7% (price as of 2026-10-02) |
| Jan. 21, 2026 | MTX | M | 1,193 | · | · | 6,974 Direct | +20.64% | Acquired | (price as of 2026-10-02) |
| Jan. 20, 2026 | MTX | A | 3,828 | · | · | 3,828 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 20, 2026 | MTX | A | 4,457 | · | · | 11,782 Direct | +60.85% | Acquired | (price as of 2026-10-02) |
| Jan. 27, 2025 | MTX | M | 906 | · | · | 6,176 Direct | +17.19% | Acquired | (price as of 2026-10-02) |
| Jan. 27, 2025 | MTX | F | 395 | $76.19 | $30,095 | 5,781 Direct | -6.40% | Disposed | -12.8% (price as of 2026-10-02) |
| Jan. 27, 2025 | MTX | M | 906 | · | · | 7,325 Direct | -11.01% | Disposed | (price as of 2026-10-02) |
| Jan. 24, 2025 | MTX | M | 1,196 | · | · | 5,809 Direct | +25.93% | Acquired | (price as of 2026-10-02) |
| Jan. 24, 2025 | MTX | F | 539 | $75.68 | $40,792 | 5,270 Direct | -9.28% | Disposed | -12.2% (price as of 2026-10-02) |
| Jan. 24, 2025 | MTX | M | 1,196 | · | · | 8,231 Direct | -12.69% | Disposed | (price as of 2026-10-02) |
| Jan. 23, 2025 | MTX | M | 1,276 | · | · | 5,045 Direct | +33.86% | Acquired | (price as of 2026-10-02) |
| Jan. 23, 2025 | MTX | F | 432 | $75.65 | $32,681 | 4,613 Direct | -8.56% | Disposed | -12.2% (price as of 2026-10-02) |
| Jan. 23, 2025 | MTX | M | 1,276 | · | · | 9,427 Direct | -11.92% | Disposed | (price as of 2026-10-02) |
| Jan. 21, 2025 | MTX | A | 3,579 | · | · | 10,703 Direct | +50.24% | Acquired | (price as of 2026-10-02) |
| Jan. 21, 2025 | MTX | A | 3,074 | · | · | 3,074 Direct | · | Acquired | (price as of 2026-10-02) |
| June 3, 2024 | MTX | M | 259 | $67.90 | $17,586 | 3,994 Direct | +6.93% | Acquired | -2.2% (price as of 2026-10-02) |
| June 3, 2024 | MTX | S | 225 | $86.16 | $19,386 | 3,769 Direct | -5.63% | Disposed | -22.9% (price as of 2026-10-02) |
| June 3, 2024 | MTX | M | 259 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Jan. 26, 2024 | MTX | M | 778 | · | · | 3,953 Direct | +24.50% | Acquired | (price as of 2026-10-02) |
| Jan. 26, 2024 | MTX | F | 218 | $66.50 | $14,497 | 3,735 Direct | -5.51% | Disposed | -0.1% (price as of 2026-10-02) |
| Jan. 26, 2024 | MTX | M | 778 | · | · | 7,124 Direct | -9.85% | Disposed | (price as of 2026-10-02) |
| Jan. 25, 2024 | MTX | M | 907 | · | · | 3,480 Direct | +35.25% | Acquired | (price as of 2026-10-02) |
| Jan. 25, 2024 | MTX | F | 305 | $66.09 | $20,157 | 3,175 Direct | -8.76% | Disposed | 0.5% (price as of 2026-10-02) |
| Jan. 25, 2024 | MTX | M | 907 | · | · | 7,902 Direct | -10.30% | Disposed | (price as of 2026-10-02) |
| Jan. 24, 2024 | MTX | M | 1,196 | · | · | 2,978 Direct | +67.12% | Acquired | (price as of 2026-10-02) |
| Jan. 24, 2024 | MTX | F | 405 | $66.10 | $26,770 | 2,573 Direct | -13.60% | Disposed | 0.5% (price as of 2026-10-02) |
| Jan. 24, 2024 | MTX | M | 1,196 | · | · | 8,809 Direct | -11.95% | Disposed | (price as of 2026-10-02) |
| Jan. 23, 2024 | MTX | A | 3,827 | · | · | 10,005 Direct | +61.95% | Acquired | (price as of 2026-10-02) |
| Jan. 23, 2024 | MTX | A | 3,286 | · | · | 3,286 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 26, 2023 | MTX | M | 778 | · | · | 2,045 Direct | +61.40% | Acquired | (price as of 2026-10-02) |
| Jan. 26, 2023 | MTX | F | 263 | $67.56 | $17,768 | 1,782 Direct | -12.86% | Disposed | -1.7% (price as of 2026-10-02) |
| Jan. 26, 2023 | MTX | M | 778 | · | · | 6,178 Direct | -11.18% | Disposed | (price as of 2026-10-02) |
| Jan. 25, 2023 | MTX | M | 907 | · | · | 1,574 Direct | +135.98% | Acquired | (price as of 2026-10-02) |
| Jan. 25, 2023 | MTX | F | 307 | $66.42 | $20,391 | 1,267 Direct | -19.50% | Disposed | 0.0% (price as of 2026-10-02) |
| Jan. 25, 2023 | MTX | M | 907 | · | · | 6,956 Direct | -11.54% | Disposed | (price as of 2026-10-02) |
| Jan. 24, 2023 | MTX | A | 3,587 | · | · | 7,863 Direct | +83.89% | Acquired | (price as of 2026-10-02) |
| Jan. 24, 2023 | MTX | A | 6,162 | · | · | 6,162 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 26, 2022 | MTX | M | 778 | · | · | 930 Direct | +511.84% | Acquired | (price as of 2026-10-02) |
| Jan. 26, 2022 | MTX | F | 263 | $70.62 | $18,573 | 667 Direct | -28.28% | Disposed | -5.9% (price as of 2026-10-02) |
| Jan. 26, 2022 | MTX | M | 778 | · | · | 4,276 Direct | -15.39% | Disposed | (price as of 2026-10-02) |
| Jan. 25, 2022 | MTX | A | 2,720 | · | · | 5,054 Direct | +116.54% | Acquired | (price as of 2026-10-02) |
| Jan. 25, 2022 | MTX | A | 4,672 | · | · | 4,672 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 26, 2021 | MTX | A | 2,334 | · | · | 2,334 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 26, 2021 | MTX | A | 4,022 | · | · | 4,022 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 25, 2021 | MTX | F | 8 | $65.93 | $527 | 152 Direct | -5.00% | Disposed | 0.8% (price as of 2026-10-02) |
| Jan. 23, 2021 | MTX | M | 21 | · | · | 160 Direct | +15.11% | Acquired | (price as of 2026-10-02) |
| Jan. 23, 2021 | MTX | M | 21 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
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 | · | · | 1,195 | Disposed |
| Jan. 23, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 1,276 | Disposed |
| Jan. 21, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 1,193 | Disposed |
| Jan. 20, 2026 | MTX | Employee Stock Option (Right to Buy) | Common Stock | $66.23 | Jan. 20, 2036 | 3,828 | Acquired |
| Jan. 20, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 4,457 | Acquired |
| Jan. 27, 2025 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 906 | Disposed |
| Jan. 24, 2025 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 1,196 | Disposed |
| Jan. 23, 2025 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 1,276 | Disposed |
| Jan. 21, 2025 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 3,579 | Acquired |
| Jan. 21, 2025 | MTX | Employee Stock Option (Right to Buy) | Common Stock | $76.75 | Jan. 21, 2035 | 3,074 | Acquired |
| June 3, 2024 | MTX | Employee Stock Option (Right to Buy) | Common Stock | $67.90 | July 6, 2025 | 259 | Disposed |
| Jan. 26, 2024 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 778 | Disposed |
| Jan. 25, 2024 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 907 | Disposed |
| Jan. 24, 2024 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 1,196 | Disposed |
| Jan. 23, 2024 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 3,827 | Acquired |
| Jan. 23, 2024 | MTX | Employee Stock Option (Right to Buy) | Common Stock | $66.72 | Jan. 23, 2034 | 3,286 | Acquired |
| Jan. 26, 2023 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 778 | Disposed |
| Jan. 25, 2023 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 907 | Disposed |
| Jan. 24, 2023 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 3,587 | Acquired |
| Jan. 24, 2023 | MTX | Employee Stock Option (Right to Buy) | Common Stock | $66.08 | Jan. 24, 2033 | 6,162 | Acquired |
| Jan. 26, 2022 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 778 | Disposed |
| Jan. 25, 2022 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 2,720 | Acquired |
| Jan. 25, 2022 | MTX | Employee Stock Option (Right to Buy) | Common Stock | $69.81 | Jan. 25, 2032 | 4,672 | Acquired |
| Jan. 26, 2021 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 2,334 | Acquired |
| Jan. 26, 2021 | MTX | Employee Stock Option (Right to Buy) | Common Stock | $66.00 | Jan. 26, 2031 | 4,022 | Acquired |
| Jan. 23, 2021 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock | · | · | 21 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 6 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Aug. 28, 2020 | MTX | Common Stock | 139 | Direct |
| Aug. 28, 2020 | MTX | Common Stock | 660 | Indirect |
| Aug. 28, 2020 | MTX | Employee Stock Option (Right to Buy) | 259 | Direct |
| Aug. 28, 2020 | MTX | Employee Stock Option (Right to Buy) | 126 | Direct |
| Aug. 28, 2020 | MTX | Employee Stock Option (Right to Buy) | 1,102 | Direct |
| Aug. 28, 2020 | MTX | Deferred Restricted Stock Units (DRSUs) | 21 | Direct |