MTZ's three largest insider shareholders as of September 12, 2026 are Jorge Mas (Director, 4.56Mn shares), Jose Ramon Mas (Ceo, 3.25Mn shares), Robert E Apple (Coo, 183.59K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Jorge Mas | Director | 4,556,686 | 0 | 4,556,686 | 52.9% | 20 Mar, 2026 |
| 2 | Jose Ramon Mas | Ceo | 3,254,461 | 0 | 3,254,461 | 37.8% | 20 Mar, 2026 |
| 3 | George Pita | Cfo | 293,719 | 0 | 293,719 | 3.4% | 21 Mar, 2023 |
| 4 | Robert E Apple | Coo | 183,591 | 0 | 183,591 | 2.1% | 20 Mar, 2026 |
| 5 | Cardenas Alberto De | Evp, General Counsel | 102,780 | 0 | 102,780 | 1.2% | 20 Mar, 2026 |
| 6 | Julia L Johnson | Director | 73,474 | 0 | 73,474 | 0.9% | 18 Aug, 2026 |
| 7 | Paul Dimarco | Cfo | 66,627 | 0 | 66,627 | 0.8% | 20 Mar, 2026 |
| 8 | C Robert Campbell | Evp Cfo | 30,741 | 0 | 30,741 | 0.4% | 19 May, 2026 |
| 9 | Robert J Dwyer | Director | 20,778 | 0 | 20,778 | 0.2% | 18 Feb, 2026 |
| 10 | Ernst N Csiszar | Director | 10,934 | 0 | 10,934 | 0.1% | 18 Aug, 2026 |
| 11 | Javier Alberto Palomarez | Director | 10,774 | 0 | 10,774 | 0.1% | 18 Aug, 2026 |
| 12 | Timothy Michael Love | Cao | 10,292 | 0 | 10,292 | 0.1% | 17 Apr, 2026 |
| 13 | Ava L Parker | Director | 5,392 | 0 | 5,392 | 0.1% | 19 May, 2026 |
| 14 | Manuel Benito Miranda | Director | 152 | 0 | 152 | 0.0% | 18 Aug, 2026 |
| 15 | Alex Spiro | Director | 139 | 0 | 139 | 0.0% | 18 Aug, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 14 Aug, 2026 | Javier Alberto Palomarez | Director | Acquired A | 139 | $0.00 | $0 | 10,805 | Direct |
| 14 Aug, 2026 | Ernst N Csiszar | Director | Acquired A | 152 | $0.00 | $0 | 10,968 | Direct |
| 14 Aug, 2026 | Julia L Johnson | Director | Acquired A | 139 | $0.00 | $0 | 73,474 | Direct |
| 14 Aug, 2026 | Alex Spiro | Director | Acquired A | 139 | $0.00 | $0 | 139 | Direct |
| 14 Aug, 2026 | Manuel Benito Miranda | Director | Acquired A | 152 | $0.00 | $0 | 152 | Direct |
| 14 Aug, 2026 | Ernst N Csiszar | Director | Disposed F | 34 | $297.59 | $10.12K | 10,934 | Direct |
| 14 Aug, 2026 | Javier Alberto Palomarez | Director | Disposed F | 31 | $297.59 | $9.23K | 10,774 | Direct |
| 11 Aug, 2026 | Jorge Mas | Director | Disposed J | 1,099,335 | — | — | 0 | Indirect |
| 11 Aug, 2026 | Jose Ramon Mas | Ceo | Disposed J | 340,794 | — | — | 0 | Direct |
| 11 Aug, 2026 | Jorge Mas | Director | Acquired J | 1,099,335 | — | — | 1,099,335 | Indirect |
| 11 Aug, 2026 | Jose Ramon Mas | Ceo | Acquired J | 340,794 | — | — | 340,794 | Direct |
| 03 Jun, 2026 | Ernst N Csiszar | Director | Disposed S | 6,500 | $371.17 | $2.41Mn | 10,816 | Direct |
| 15 May, 2026 | Julia L Johnson | Director | Acquired A | 95 | $0.00 | $0 | 73,335 | Direct |
| 15 May, 2026 | C Robert Campbell | Director | Acquired A | 95 | $0.00 | $0 | 30,741 | Direct |
| 15 May, 2026 | Ernst N Csiszar | Director | Acquired A | 104 | $0.00 | $0 | 17,339 | Direct |
| 15 May, 2026 | Javier Alberto Palomarez | Director | Acquired A | 95 | $0.00 | $0 | 10,687 | Direct |
| 15 May, 2026 | Ava L Parker | Director | Acquired A | 121 | $0.00 | $0 | 5,406 | Direct |
| 15 May, 2026 | Javier Alberto Palomarez | Director | Disposed F | 21 | $434.77 | $9.13K | 10,666 | Direct |
| 15 May, 2026 | Ernst N Csiszar | Director | Disposed F | 23 | $434.77 | $10.00K | 17,316 | Direct |
| 15 May, 2026 | Ava L Parker | Director | Disposed F | 14 | $434.77 | $6.09K | 5,392 | Direct |