Marc E Robinson
Insider
First SEC filing: Jan. 25, 2012 · Latest: May 21, 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 |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 4, 2026 | MTX | A | 45 | · | · | 26,960 Direct | +0.17% | Acquired | (price as of 2026-10-02) |
| June 18, 2026 | MTX | A | 41 | · | · | 26,915 Direct | +0.15% | Acquired | (price as of 2026-10-02) |
| May 20, 2026 | MTX | A | 1,908 | · | · | 26,874 Direct | +7.64% | Acquired | (price as of 2026-10-02) |
| March 6, 2026 | MTX | A | 44 | · | · | 24,965 Direct | +0.18% | Acquired | (price as of 2026-10-02) |
| Dec. 4, 2025 | MTX | A | 51 | · | · | 24,921 Direct | +0.21% | Acquired | (price as of 2026-10-02) |
| Sept. 5, 2025 | MTX | A | 43 | · | · | 24,870 Direct | +0.17% | Acquired | (price as of 2026-10-02) |
| June 12, 2025 | MTX | A | 49 | · | · | 24,828 Direct | +0.20% | Acquired | (price as of 2026-10-02) |
| May 14, 2025 | MTX | A | 2,500 | · | · | 24,779 Direct | +11.22% | Acquired | (price as of 2026-10-02) |
| March 7, 2025 | MTX | A | 36 | · | · | 22,279 Direct | +0.16% | Acquired | (price as of 2026-10-02) |
| Dec. 5, 2024 | MTX | A | 30 | · | · | 22,243 Direct | +0.14% | Acquired | (price as of 2026-10-02) |
| Sept. 6, 2024 | MTX | A | 31 | · | · | 22,212 Direct | +0.14% | Acquired | (price as of 2026-10-02) |
| June 13, 2024 | MTX | A | 27 | · | · | 22,181 Direct | +0.12% | Acquired | (price as of 2026-10-02) |
| May 15, 2024 | MTX | A | 1,542 | · | · | 22,155 Direct | +7.48% | Acquired | (price as of 2026-10-02) |
| March 7, 2024 | MTX | A | 28 | · | · | 20,613 Direct | +0.14% | Acquired | (price as of 2026-10-02) |
| Dec. 7, 2023 | MTX | A | 32 | · | · | 20,585 Direct | +0.16% | Acquired | (price as of 2026-10-02) |
| Sept. 8, 2023 | MTX | A | 19 | · | · | 20,553 Direct | +0.09% | Acquired | (price as of 2026-10-02) |
| June 15, 2023 | MTX | A | 18 | · | · | 20,534 Direct | +0.09% | Acquired | (price as of 2026-10-02) |
| May 17, 2023 | MTX | A | 2,067 | · | · | 20,516 Direct | +11.20% | Acquired | (price as of 2026-10-02) |
| March 9, 2023 | MTX | A | 15 | · | · | 18,449 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Dec. 8, 2022 | MTX | A | 15 | · | · | 18,434 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Sept. 9, 2022 | MTX | A | 15 | · | · | 18,419 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| June 16, 2022 | MTX | A | 16 | · | · | 18,404 Direct | +0.09% | Acquired | (price as of 2026-10-02) |
| May 18, 2022 | MTX | A | 1,759 | · | · | 18,388 Direct | +10.58% | Acquired | (price as of 2026-10-02) |
| March 10, 2022 | MTX | A | 13 | · | · | 16,630 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Dec. 9, 2021 | MTX | A | 12 | · | · | 16,617 Direct | +0.07% | Acquired | (price as of 2026-10-02) |
| Sept. 9, 2021 | MTX | A | 11 | · | · | 16,605 Direct | +0.07% | Acquired | (price as of 2026-10-02) |
| June 17, 2021 | MTX | A | 11 | · | · | 16,594 Direct | +0.07% | Acquired | (price as of 2026-10-02) |
| May 19, 2021 | MTX | A | 1,318 | · | · | 16,583 Direct | +8.63% | Acquired | (price as of 2026-10-02) |
| March 11, 2021 | MTX | A | 10 | · | · | 15,265 Direct | +0.07% | Acquired | (price as of 2026-10-02) |
| Dec. 10, 2020 | MTX | A | 12 | · | · | 15,255 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Sept. 3, 2020 | MTX | A | 15 | · | · | 15,243 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| June 11, 2020 | MTX | A | 17 | · | · | 15,228 Direct | +0.11% | Acquired | (price as of 2026-10-02) |
| May 13, 2020 | MTX | A | 2,606 | · | · | 15,211 Direct | +20.67% | Acquired | (price as of 2026-10-02) |
| March 5, 2020 | MTX | A | 14 | · | · | 12,605 Direct | +0.11% | Acquired | (price as of 2026-10-02) |
| Dec. 12, 2019 | MTX | A | 11 | · | · | 12,591 Direct | +0.09% | Acquired | (price as of 2026-10-02) |
| Sept. 5, 2019 | MTX | A | 13 | · | · | 12,580 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| June 13, 2019 | MTX | A | 11 | · | · | 12,567 Direct | +0.09% | Acquired | (price as of 2026-10-02) |
| May 15, 2019 | MTX | A | 1,902 | · | · | 12,556 Direct | +17.85% | Acquired | (price as of 2026-10-02) |
| March 7, 2019 | MTX | A | 9 | · | · | 10,655 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Dec. 7, 2018 | MTX | A | 10 | · | · | 10,646 Direct | +0.09% | Acquired | (price as of 2026-10-02) |
| Sept. 6, 2018 | MTX | A | 8 | · | · | 10,635 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| June 14, 2018 | MTX | A | 7 | · | · | 10,627 Direct | +0.07% | Acquired | (price as of 2026-10-02) |
| May 16, 2018 | MTX | A | 1,381 | · | · | 10,620 Direct | +14.95% | Acquired | (price as of 2026-10-02) |
| May 16, 2018 | MTX | A | 1,344 | · | · | 10,583 Direct | +14.55% | Acquired | (price as of 2026-10-02) |
| March 8, 2018 | MTX | A | 6 | · | · | 9,239 Direct | +0.06% | Acquired | (price as of 2026-10-02) |
| Dec. 8, 2017 | MTX | A | 7 | · | · | 9,233 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Sept. 7, 2017 | MTX | A | 7 | · | · | 9,226 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| July 3, 2017 | MTX | A | 1,387 | · | · | 9,219 Direct | +17.71% | Acquired | (price as of 2026-10-02) |
| March 9, 2017 | MTX | A | 5 | · | · | 7,831 Direct | +0.06% | Acquired | (price as of 2026-10-02) |
| Dec. 9, 2016 | MTX | A | 5 | · | · | 7,826 Direct | +0.06% | Acquired | (price as of 2026-10-02) |
| Sept. 8, 2016 | MTX | A | 6 | · | · | 7,821 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| June 9, 2016 | MTX | A | 7 | · | · | 7,815 Direct | +0.09% | Acquired | (price as of 2026-10-02) |
| May 11, 2016 | MTX | A | 1,496 | · | · | 7,809 Direct | +23.70% | Acquired | (price as of 2026-10-02) |
| March 10, 2016 | MTX | A | 6 | · | · | 6,313 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| Dec. 10, 2015 | MTX | A | 6 | · | · | 6,307 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| Sept. 10, 2015 | MTX | A | 6 | · | · | 6,302 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| June 10, 2015 | MTX | A | 4 | · | · | 6,296 Direct | +0.06% | Acquired | (price as of 2026-10-02) |
| May 13, 2015 | MTX | A | 1,177 | · | · | 6,291 Direct | +23.02% | Acquired | (price as of 2026-10-02) |
| March 11, 2015 | MTX | A | 4 | · | · | 5,114 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Dec. 11, 2014 | MTX | A | 4 | · | · | 5,110 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Sept. 11, 2014 | MTX | A | 4 | · | · | 5,106 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| June 11, 2014 | MTX | A | 4 | · | · | 5,102 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| May 14, 2014 | MTX | A | 1,276 | · | · | 5,098 Direct | +33.39% | Acquired | (price as of 2026-10-02) |
| March 13, 2014 | MTX | A | 3 | · | · | 3,822 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Dec. 12, 2013 | MTX | A | 3 | · | · | 3,819 Direct | +0.08% | Acquired | (price as of 2026-10-02) |
| Sept. 12, 2013 | MTX | A | 4 | · | · | 3,815 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| June 12, 2013 | MTX | A | 5 | · | · | 3,811 Direct | +0.13% | Acquired | (price as of 2026-10-02) |
| May 15, 2013 | MTX | A | 1,757 | · | · | 3,807 Direct | +85.71% | Acquired | (price as of 2026-10-02) |
| March 13, 2013 | MTX | A | 2 | · | · | 2,049 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| Dec. 31, 2012 | MTX | A | 3 | · | · | 2,047 Direct | +0.15% | Acquired | (price as of 2026-10-02) |
| Sept. 13, 2012 | MTX | A | 1 | · | · | 1,022 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| June 13, 2012 | MTX | A | 1 | · | · | 1,022 Direct | +0.10% | Acquired | (price as of 2026-10-02) |
| June 1, 2012 | MTX | P | 100 | $62.10 | $6,210 | 200 Direct | +100.00% | Acquired | 113.9% (price as of 2026-10-02) |
| May 17, 2012 | MTX | P | 100 | $62.83 | $6,283 | 100 Direct | · | Acquired | 111.5% (price as of 2026-10-02) |
| May 16, 2012 | MTX | A | 1,021 | · | · | 1,021 Direct | · | Acquired | (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 |
|---|---|---|---|---|---|---|---|
| Sept. 4, 2026 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 45 | Acquired |
| June 18, 2026 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 41 | Acquired |
| May 20, 2026 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 1,908 | Acquired |
| March 6, 2026 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 44 | Acquired |
| Dec. 4, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 51 | Acquired |
| Sept. 5, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 43 | Acquired |
| June 12, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 49 | Acquired |
| May 14, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 2,500 | Acquired |
| March 7, 2025 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 36 | Acquired |
| Dec. 5, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 30 | Acquired |
| Sept. 6, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 31 | Acquired |
| June 13, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 27 | Acquired |
| May 15, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 1,542 | Acquired |
| March 7, 2024 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 28 | Acquired |
| Dec. 7, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 32 | Acquired |
| Sept. 8, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 19 | Acquired |
| June 15, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 18 | Acquired |
| May 17, 2023 | MTX | PHANTOM STOCK UNITS | COMMON STOCK | · | · | 2,067 | Acquired |
| March 9, 2023 | MTX | Phantom Stock Units | Common Stock | · | · | 15 | Acquired |
| Dec. 8, 2022 | MTX | Phantom Stock Units | Common Stock | · | · | 15 | Acquired |
| Sept. 9, 2022 | MTX | Phantom Stock Units | Common Stock | · | · | 15 | Acquired |
| June 16, 2022 | MTX | Phantom Stock Units | Common Stock | · | · | 16 | Acquired |
| May 18, 2022 | MTX | Phantom Stock Units | Common Stock | · | · | 1,759 | Acquired |
| March 10, 2022 | MTX | Phantom Stock Units | Common Stock | · | · | 13 | Acquired |
| Dec. 9, 2021 | MTX | Phantom Stock Units | Common Stock | · | · | 12 | Acquired |
| Sept. 9, 2021 | MTX | Phantom Stock Units | Common Stock | · | · | 11 | Acquired |
| June 17, 2021 | MTX | Phantom Stock Units | Common Stock | · | · | 11 | Acquired |
| May 19, 2021 | MTX | Phantom Stock Units | Common Stock | · | · | 1,318 | Acquired |
| March 11, 2021 | MTX | Phantom Stock Units | Common Stock | · | · | 10 | Acquired |
| Dec. 10, 2020 | MTX | Phantom Stock Units | Common Stock | · | · | 12 | Acquired |
| Sept. 3, 2020 | MTX | Phantom Stock Units | Common Stock | · | · | 15 | Acquired |
| June 11, 2020 | MTX | Phantom Stock Units | Common Stock | · | · | 17 | Acquired |
| May 13, 2020 | MTX | Phantom Stock Units | Common Stock | · | · | 2,606 | Acquired |
| March 5, 2020 | MTX | Phantom Stock Units | Common Stock | · | · | 14 | Acquired |
| Dec. 12, 2019 | MTX | Phantom Stock Units | Common Stock | · | · | 11 | Acquired |
| Sept. 5, 2019 | MTX | Phantom Stock Units | Common Stock | · | · | 13 | Acquired |
| June 13, 2019 | MTX | Phantom Stock Units | Common Stock | · | · | 11 | Acquired |
| May 15, 2019 | MTX | Phantom Stock Units | Common Stock | · | · | 1,902 | Acquired |
| March 7, 2019 | MTX | Phantom Stock Units | Common Stock | · | · | 9 | Acquired |
| Dec. 7, 2018 | MTX | Phantom Stock Units | Common Stock | · | · | 10 | Acquired |
| Sept. 6, 2018 | MTX | Phantom Stock Units | Common Stock | · | · | 8 | Acquired |
| June 14, 2018 | MTX | Phantom Stock Units | Common Stock | · | · | 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 | Acquired |
| March 8, 2018 | MTX | Phantom Stock Units | Common Stock | · | · | 6 | Acquired |
| Dec. 8, 2017 | MTX | Phantom Stock Units | Common Stock | · | · | 7 | Acquired |
| Sept. 7, 2017 | MTX | Phantom Stock Units | Common Stock | · | · | 7 | Acquired |
| July 3, 2017 | MTX | Phantom Stock Units | Common Stock | · | · | 1,387 | Acquired |
| March 9, 2017 | MTX | Phantom Stock Units | Common Stock | · | · | 5 | Acquired |
| Dec. 9, 2016 | MTX | Phantom Stock Units | Common Stock | · | · | 5 | Acquired |
| Sept. 8, 2016 | MTX | Phantom Stock Units | Common Stock | · | · | 6 | Acquired |
| June 9, 2016 | MTX | Phantom Stock Units | Common Stock | · | · | 7 | Acquired |
| May 11, 2016 | MTX | Phantom Stock Units | Common Stock | · | · | 1,496 | Acquired |
| March 10, 2016 | MTX | Phantom Stock Units | Common Stock | · | · | 6 | Acquired |
| Dec. 10, 2015 | MTX | Phantom Stock Units | Common Stock | · | · | 6 | Acquired |
| Sept. 10, 2015 | MTX | Phantom Stock Units | Common Stock | · | · | 6 | Acquired |
| June 10, 2015 | MTX | Phantom Stock Units | Common Stock | · | · | 4 | Acquired |
| May 13, 2015 | MTX | Phantom Stock Units | Common Stock | · | · | 1,177 | Acquired |
| March 11, 2015 | MTX | Phantom Stock Units | Common Stock | · | · | 4 | Acquired |
| Dec. 11, 2014 | MTX | Phantom Stock Units | Common Stock | · | · | 4 | Acquired |
| Sept. 11, 2014 | MTX | Phantom Stock Units | Common Stock | · | · | 4 | Acquired |
| June 11, 2014 | MTX | Phantom Stock Units | Common Stock | · | · | 4 | Acquired |
| May 14, 2014 | MTX | Phantom Stock Units | Common Stock | · | · | 1,276 | Acquired |
| March 13, 2014 | MTX | Phantom Stock Units | Common Stock | · | · | 3 | Acquired |
| Dec. 12, 2013 | MTX | Phantom Stock Units | Common Stock | · | · | 3 | Acquired |
| Sept. 12, 2013 | MTX | Phantom Stock Units | Common Stock | · | · | 4 | Acquired |
| June 12, 2013 | MTX | Phantom Stock Units | Common Stock | · | · | 5 | Acquired |
| May 15, 2013 | MTX | Phantom Stock Units | Common Stock | · | · | 1,757 | Acquired |
| March 13, 2013 | MTX | Phantom Stock Units | Common Stock | · | · | 2 | Acquired |
| Dec. 31, 2012 | MTX | Phantom Stock Units | Common Stock | · | · | 3 | Acquired |
| Sept. 13, 2012 | MTX | Phantom Stock Units | Common Stock | · | · | 1 | Acquired |
| June 13, 2012 | MTX | Phantom Stock Units | Common Stock | · | · | 1 | Acquired |
| May 16, 2012 | MTX | Phantom Stock Units | Common Stock | · | · | 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 |