MasTec (NYSE: MTZ) sets 401(k) blackout for Schwab plan switch in 2025

Rhea-AI Filing Summary

MasTec, Inc. disclosed a temporary blackout period for its 401(k) Retirement Plan as it changes recordkeeper services from Bank of America/Merrill Lynch to Schwab Retirement Plan Services, Inc., effective October 1, 2025. Because of this transition, plan participants and beneficiaries will not be able to take loans or distributions, make rollovers, change investment elections or contribution rates, or request fund transfers, including with respect to MasTec common stock, during the blackout window.

The blackout is expected to begin at 4:00 p.m. Eastern Time on September 22, 2025 and end during the week of October 19, 2025. MasTec also notified its directors and executive officers that, during this blackout period, they are prohibited from directly or indirectly buying, selling, or otherwise transferring MasTec common stock acquired in connection with their service or employment. A copy of this blackout notice is filed as an exhibit, and shareholders can request the actual blackout dates from the company’s 401(k) plan administrator.

8-K Event Classification

2 items: 5.04, 9.01

2 items

Item 5.04 Temporary Suspension of Trading Under Registrant's Employee Benefit Plans Governance

Trading in company securities was temporarily suspended under an employee benefit plan (blackout period).

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

Understanding 8-K Material Events →

MASTEC INC false 0000015615 0000015615 2025-08-22 2025-08-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 22, 2025

MasTec, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Florida		001-08106		65-0829355
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(IRS Employer Identification No.)

800 S. Douglas Road, 12th Floor

Coral Gables, Florida 33134

(Address of Principal Executive Office)

Registrant’s telephone number, including area code (305) 599-1800

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading symbol(s)		Name of each exchange on which registered
Common Stock, $0.10 Par Value		MTZ		New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

ITEM 5.04 Temporary Suspension of Trading Under Registrant’s Employee Benefit Plans.

On August 22, 2025, MasTec, Inc. (the “Company”) received the notification described under Section 101(i)(2)(E) of the Employment Retirement Income Security Act of 1974 regarding a blackout period for the MasTec, Inc. 401(k) Retirement Plan (the “401(k) plan”). The 401(k) plan is transitioning recordkeeper services from Bank of America/Merrill Lynch to Schwab Retirement Plan Services, Inc., effective October 1, 2025. As a result of this transition, there will be a blackout period (the “Blackout Period”) during which 401(k) plan participants and beneficiaries will be temporarily unable to obtain a loan or a distribution from the 401(k) plan, contribute rollovers or submit loan checks, change existing investment elections or contribution rates or request a fund transfer, including with respect to shares of common stock, $0.10 par value per share, of the Company (“MasTec Common Stock”), as applicable. The Blackout Period is expected to begin at 4:00 pm Eastern Time on Monday, September 22, 2025 and end during the week of October 19, 2025.

On August 26, 2025, the Company sent a notice (the “Blackout Notice”) to its directors and executive officers pursuant to Section 306(a) of the Sarbanes-Oxley Act of 2002 and Section 104 of Regulation BTR under the Securities Exchange Act of 1934, as amended. The Blackout Notice informed directors and executive officers that during the Blackout Period, they will be prohibited from, directly or indirectly purchasing, selling or otherwise acquiring or transferring any MasTec Common Stock acquired in connection with their service or employment as a director or executive officer of the Company.

A copy of the Blackout Notice is attached as Exhibit 99.1. During the Blackout Period and for a period of two years after the ending date of the Blackout Period, shareholders or other interested parties may obtain, without charge, information about the actual beginning and ending dates of the Blackout Period by contacting the Company’s 401(k) plan Administrator by telephone at (305) 599-1800 or by mail at c/o 401(k) Plan Administrator, MasTec, Inc., 800 S. Douglas Road, 12th Floor, Coral Gables, Florida 33134.

ITEM 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit Number		Description
99.1		Notice to Directors and Executive Officers dated August 26, 2025
104		The cover page of MasTec, Inc.’s Current Report on Form 8-K, formatted in Inline XBRL (included with the Exhibit 101 attachments).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

				MASTEC, INC.
Date:  August 27, 2025				By:		/s/ Alberto de Cardenas
				Name:		Alberto de Cardenas
				Title:		Executive Vice President, General Counsel and Secretary

FAQ

What did MasTec (MTZ) disclose in this 8-K filing?

MasTec disclosed a temporary blackout period for the MasTec, Inc. 401(k) Retirement Plan while it transitions recordkeeper services from Bank of America/Merrill Lynch to Schwab Retirement Plan Services, Inc., and related trading restrictions for directors and executive officers.

When is the MasTec 401(k) blackout period scheduled to occur?

The 401(k) blackout period is expected to begin at 4:00 p.m. Eastern Time on September 22, 2025 and to end during the week of October 19, 2025, subject to the actual completion of the transition.

Which 401(k) transactions are affected for MasTec employees during the blackout?

During the blackout, 401(k) participants and beneficiaries cannot obtain loans or distributions, contribute rollovers or submit loan checks, change investment elections or contribution rates, or request fund transfers, including transactions involving MasTec common stock, as applicable.

How are MasTec directors and executive officers affected by the blackout?

MasTec’s directors and executive officers received a Blackout Notice stating that, during the blackout period, they are prohibited from directly or indirectly purchasing, selling, or otherwise acquiring or transferring MasTec common stock that was acquired in connection with their service or employment.

Why is MasTec implementing a 401(k) blackout period?

The blackout period is being implemented because the MasTec, Inc. 401(k) Retirement Plan is transitioning recordkeeper services from Bank of America/Merrill Lynch to Schwab Retirement Plan Services, Inc., effective October 1, 2025.

How can MasTec shareholders find the actual dates of the blackout period?

During the blackout and for two years after it ends, shareholders and other interested parties can obtain information about the actual beginning and ending dates of the blackout by contacting the company’s 401(k) plan administrator by phone at (305) 599-1800 or by mail at the listed Coral Gables address.

What exhibit is included with this MasTec 8-K related to the blackout?

The filing includes Exhibit 99.1, which is the Notice to Directors and Executive Officers dated August 26, 2025, describing the trading restrictions during the blackout period.