Erin Cutler
CIK 1822821 · View on SEC EDGAR ↗
Insider
First SEC filing: Aug. 28, 2020 · Latest: Jan. 27, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 11 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| 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 2026-08-19) |
| Jan. 26, 2026 | MTX | F | 520 | $68.89 | $35,823 | 7,734 Direct | -6.30% | Disposed | 5.8% (price as of 2026-08-19) |
| Jan. 26, 2026 | MTX | M | 1,195 | — | — | 8,254 Direct | +16.93% | Acquired | (price as of 2026-08-19) |
| Jan. 23, 2026 | MTX | M | 1,276 | — | — | 9,313 Direct | -12.05% | Disposed | (price as of 2026-08-19) |
| Jan. 23, 2026 | MTX | F | 608 | $68.77 | $41,812 | 7,059 Direct | -7.93% | Disposed | 6.0% (price as of 2026-08-19) |
| Jan. 23, 2026 | MTX | M | 1,276 | — | — | 7,667 Direct | +19.97% | Acquired | (price as of 2026-08-19) |
| Jan. 21, 2026 | MTX | M | 1,193 | — | — | 10,589 Direct | -10.13% | Disposed | (price as of 2026-08-19) |
| Jan. 21, 2026 | MTX | F | 583 | $66.92 | $39,014 | 6,391 Direct | -8.36% | Disposed | 9.0% (price as of 2026-08-19) |
| Jan. 21, 2026 | MTX | M | 1,193 | — | — | 6,974 Direct | +20.64% | Acquired | (price as of 2026-08-19) |
| Jan. 20, 2026 | MTX | A | 3,828 | — | — | 3,828 Direct | — | Acquired | (price as of 2026-08-19) |
| Jan. 20, 2026 | MTX | A | 4,457 | — | — | 11,782 Direct | +60.85% | Acquired | (price as of 2026-08-19) |
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) | — | — | 1,195 | Disposed |
| Jan. 23, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock (1,276) | — | — | 1,276 | Disposed |
| Jan. 21, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock (1,193) | — | — | 1,193 | Disposed |
| Jan. 20, 2026 | MTX | Employee Stock Option (Right to Buy) | Common Stock (3,828) | $66.23 | Jan. 20, 2036 | 3,828 | Acquired |
| Jan. 20, 2026 | MTX | Deferred Restricted Stock Units (DRSUs) | Common Stock (4,457) | — | — | 4,457 | Acquired |
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)→ Common Stock (259) | 259 | Direct |
| Aug. 28, 2020 | MTX | Employee Stock Option (Right to Buy)→ Common Stock (126) | 126 | Direct |
| Aug. 28, 2020 | MTX | Employee Stock Option (Right to Buy)→ Common Stock (1,102) | 1,102 | Direct |
| Aug. 28, 2020 | MTX | Deferred Restricted Stock Units (DRSUs)→ Common Stock (21) | 21 | Direct |