Mastec Inc
MTZ- Exchange
- NYSE
- Industry
- Water, Sewer, Pipeline, Comm & Power Line Construction
- SEC CIK
- 0000015615
No open-market purchases or sales by Mastec Inc insiders were filed in the last 90 days; 911 institutions reported holding it in 13F filings for Q2 2026, worth $24.7B in total; 4 superinvestors hold it, including Lone Pine Capital and Coatue Management.
Holders of 5% or more of MTZ
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Mastec Inc, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Mas Jorge | 13D/A | 15.00%11.9M shares | – | Aug 22, 20251 filing | Aug 22, 2025 | SEC |
| Mas Jose Ramon | 13D/A | 7.80%6.19M shares | – | Aug 22, 20251 filing | Aug 22, 2025 | SEC |
| BlackRock, Inc. | 13G/A | 6.80%5.42M shares | −2.40 ppfrom 9.20% | Feb 5, 20252 filings | Apr 17, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
7 Schedule 13D and 13G filings on Mastec Inc, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 27, 202610:34 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Aug 22, 20254:25 PM ET | Mas Jorgeand 7 others | 13D/A | 15.00%11.9M shares | – | Aug 21, 2025 | SEC |
| Aug 22, 20254:20 PM ET | Mas Jose Ramonand 6 others | 13D/A | 7.80%6.19M shares | – | Aug 21, 2025 | SEC |
| Apr 17, 20259:35 AM ET | BlackRock, Inc. | 13G/A | 6.80%5.42M shares | −2.40 ppfrom 9.20% | Mar 31, 2025 | SEC |
| Feb 5, 20251:23 PM ET | BlackRock, Inc. | 13G/A | 9.20%7.29M shares | – | Dec 31, 2024 | SEC |
| Nov 5, 202412:41 PM ET | Nordea Investment Management AB | 13G | 2.50%1.99M shares | −2.50 ppfrom 5.00%Below 5% | Sep 30, 2024 | SEC |
| Feb 6, 20245:50 PM ET | Nordea Investment Management AB | 13G | 5.00%3.96M shares | New | Dec 31, 2023 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Mastec Inc shares.
No Form 144 notices for Mastec Inc are on file.