---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-189769"
form_type: "8-K"
ticker: "MTZ"
cik: "0000015615"
company_name: "MASTEC INC"
filed_at: "2025-08-27T23:59:59+00:00"
generated_at: "2026-05-17T09:42:03.228037+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# MasTec announces 401(k) plan blackout period from Sept 22 to Oct 19, 2025, due to recordkeeper switch to Schwab

## Summary
- Blackout period expected to begin at 4:00 pm ET on Sept 22, 2025 and end during week of Oct 19, 2025.
- Plan participants will be unable to change investments, contributions, loans, or distributions during the blackout.
- Directors and Section 16 officers are prohibited from trading MasTec common stock during the blackout per Sarbanes-Oxley.
- Recordkeeper services transitioning from Bank of America/Merrill Lynch to Schwab Retirement Plan Services effective Oct 1, 2025.
- Blackout notice sent to directors and executive officers on August 26, 2025, via Exhibit 99.1.

## SEC filing metadata
- accession: 0001193125-25-189769
- form_type: 8-K
- ticker: MTZ
- cik: 0000015615
- company_name: MASTEC INC
- filed_at: 2025-08-27T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 5.04, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/15615/000119312525189769/0001193125-25-189769-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/15615/000119312525189769/d944511d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-189769
- JSON: https://secwatch.observer/filing/0001193125-25-189769.json
- Plain text: https://secwatch.observer/filing/0001193125-25-189769.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.