Marc E Robinson
CIK 1538886 · View on SEC EDGAR ↗
Insider
First SEC filing: Jan. 25, 2012 · Latest: May 21, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 49 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
49 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| June 1, 2012 | MTX | P | 100 | $62.10 | $6,210 | 200 Direct | +100.00% | Acquired | 134.8% (price as of 2026-08-19) |
| May 17, 2012 | MTX | P | 100 | $62.83 | $6,283 | 100 Direct | — | Acquired | 132.1% (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 |
|---|---|---|---|---|---|---|---|
| June 18, 2026 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (41) | — | — | 41 | Acquired |
| May 20, 2026 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (1,908) | — | — | 1,908 | Acquired |
| March 6, 2026 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (44) | — | — | 44 | Acquired |
| Dec. 4, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (51) | — | — | 51 | Acquired |
| Sept. 5, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (43) | — | — | 43 | Acquired |
| June 12, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (49) | — | — | 49 | Acquired |
| May 14, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (2,500) | — | — | 2,500 | Acquired |
| March 7, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (36) | — | — | 36 | Acquired |
| Dec. 5, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (30) | — | — | 30 | Acquired |
| Sept. 6, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (31) | — | — | 31 | Acquired |
| June 13, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (27) | — | — | 27 | Acquired |
| May 15, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (1,542) | — | — | 1,542 | Acquired |
| March 7, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (28) | — | — | 28 | Acquired |
| Dec. 7, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (32) | — | — | 32 | Acquired |
| Sept. 8, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (19) | — | — | 19 | Acquired |
| June 15, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (18) | — | — | 18 | Acquired |
| May 17, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK (2,067) | — | — | 2,067 | Acquired |
| June 14, 2018 | MTX | Phantom Stock Units | Common Stock (7) | — | — | 7 | Acquired |
| May 16, 2018 | MTX | Phantom Stock Units | Common Stock | — | — | 1,381 | Acquired |
| May 16, 2018 | MTX | Phantom Stock Units | Common Stock (1,344) | — | — | 1,344 | Acquired |
| March 8, 2018 | MTX | Phantom Stock Units | Common Stock (6) | — | — | 6 | Acquired |
| Dec. 8, 2017 | MTX | Phantom Stock Units | Common Stock (7) | — | — | 7 | Acquired |
| Sept. 7, 2017 | MTX | Phantom Stock Units | Common Stock (7) | — | — | 7 | Acquired |
| July 3, 2017 | MTX | Phantom Stock Units | Common Stock (1,387) | — | — | 1,387 | Acquired |
| March 9, 2017 | MTX | Phantom Stock Units | Common Stock (5) | — | — | 5 | Acquired |
| Dec. 9, 2016 | MTX | Phantom Stock Units | Common Stock (5) | — | — | 5 | Acquired |
| Sept. 8, 2016 | MTX | Phantom Stock Units | Common Stock (6) | — | — | 6 | Acquired |
| June 9, 2016 | MTX | Phantom Stock Units | Common Stock (7) | — | — | 7 | Acquired |
| May 11, 2016 | MTX | Phantom Stock Units | Common Stock (1,496) | — | — | 1,496 | Acquired |
| March 10, 2016 | MTX | Phantom Stock Units | Common Stock (6) | — | — | 6 | Acquired |
| Dec. 10, 2015 | MTX | Phantom Stock Units | Common Stock (6) | — | — | 6 | Acquired |
| Sept. 10, 2015 | MTX | Phantom Stock Units | Common Stock (6) | — | — | 6 | Acquired |
| June 10, 2015 | MTX | Phantom Stock Units | Common Stock (4) | — | — | 4 | Acquired |
| May 13, 2015 | MTX | Phantom Stock Units | Common Stock (1,177) | — | — | 1,177 | Acquired |
| March 11, 2015 | MTX | Phantom Stock Units | Common Stock (4) | — | — | 4 | Acquired |
| Dec. 11, 2014 | MTX | Phantom Stock Units | Common Stock (4) | — | — | 4 | Acquired |
| Sept. 11, 2014 | MTX | Phantom Stock Units | Common Stock (4) | — | — | 4 | Acquired |
| June 11, 2014 | MTX | Phantom Stock Units | Common Stock (4) | — | — | 4 | Acquired |
| May 14, 2014 | MTX | Phantom Stock Units | Common Stock (1,276) | — | — | 1,276 | Acquired |
| March 13, 2014 | MTX | Phantom Stock Units | Common Stock (3) | — | — | 3 | Acquired |
| Dec. 12, 2013 | MTX | Phantom Stock Units | Common Stock (3) | — | — | 3 | Acquired |
| Sept. 12, 2013 | MTX | Phantom Stock Units | Common Stock (4) | — | — | 4 | Acquired |
| June 12, 2013 | MTX | Phantom Stock Units | Common Stock (5) | — | — | 5 | Acquired |
| May 15, 2013 | MTX | Phantom Stock Units | Common Stock (1,757) | — | — | 1,757 | Acquired |
| March 13, 2013 | MTX | Phantom Stock Units | Common Stock (2) | — | — | 2 | Acquired |
| Dec. 31, 2012 | MTX | Phantom Stock Units | Common Stock (3) | — | — | 3 | Acquired |
| Sept. 13, 2012 | MTX | Phantom Stock Units | Common Stock (1) | — | — | 1 | Acquired |
| June 13, 2012 | MTX | Phantom Stock Units | Common Stock (1) | — | — | 1 | Acquired |
| May 16, 2012 | MTX | Phantom Stock Units | Common Stock (1,021) | — | — | 1,021 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Jan. 25, 2012 | MTX | Common Stock | 0 | Direct |