Form 8-K

8-K — MASTEC INC

Accession: 0001193125-26-328848

Filed: 2026-07-31

Period: 2026-07-31

CIK: 0000015615

SIC: 1623 (WATER, SEWER, PIPELINE, COMM AND POWER LINE CONSTRUCTION)

Item: Financial Statements and Exhibits

Documents

8-K — d118637d8k.htm (Primary)

EX-5.1 (d118637dex51.htm)

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8-K

8-K (Primary)

Filename: d118637d8k.htm · Sequence: 1

8-K

MASTEC INC false 0000015615 0000015615 2026-07-31 2026-07-31

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): July 31, 2026

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. ☐

EXPLANATORY NOTE

This Current Report on Form 8-K (the “Form 8-K”) is being filed by MasTec, Inc., a Florida corporation, solely for the purpose of filing Exhibit 5.1 and Exhibit 23.1 (included in Exhibit 5.1) to the Form 8-K.

ITEM 9.01

Financial Statements and Exhibits.

(d) Exhibits

Exhibit

Number

Description

5.1

Opinion of Holland & Knight LLP.

23.1

Consent of Holland & Knight LLP (included in Exhibit 5.1).

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: July 31, 2026

By:

/s/ Alberto de Cardenas

Alberto de Cardenas

Executive Vice President, General Counsel and Secretary

EX-5.1

Filename: d118637dex51.htm · Sequence: 2

EX-5.1

Exhibit 5.1

July 31, 2026

MasTec,

Inc.

800 S. Douglas Road, 12th Floor

Coral Gables, FL 33134

Re:

Registration Statement on Form S-3 (Registration No. 333-285425)

Ladies and Gentlemen:

We have served as Florida counsel to MasTec, Inc., a Florida corporation (the “Company”), in connection with certain matters of Florida law arising

out of the registration by the Company of 1,219,498 shares (the “Shares”) of the Company’s common stock, par value $0.10 per share, covered by the above-referenced Registration Statement (the “Registration Statement”),

filed by the Company with the U.S. Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”). The Shares were issued pursuant to a Share Purchase Agreement (the

“Acquisition Agreement”) among the Company, Electrical Specialists, Inc., d/b/a the Superior Group, Stewshi Co., Inc., as the seller, and the shareholders and shareholder representative named therein. We are rendering this opinion

pursuant to the requirements of the Act in connection with the prospectus supplement (the “Prospectus Supplement”) dated as of the date hereof. The Prospectus Supplement relates to the sale by the Selling Shareholders named in the

Prospectus Supplement of the Shares.

In connection with our representation of the Company, and as a basis for the opinion hereinafter set forth, we have

examined and relied upon originals, or copies certified or otherwise identified to our satisfaction, of the following documents (collectively, the “Documents”):

The Registration Statement and all amendments thereto, and the related form of prospectus included therein, in

the form in which it was transmitted to the Commission under the Securities Act;

The Prospectus Supplement;

The Acquisition Agreement;

The Articles of Incorporation of the Company (the “Charter”), certified by an officer of the

Company;

The Amended and Restated By-laws of the Company (the “By-laws”), certified as of the date hereof by an officer of the Company;

A certificate of the Florida Department of State as to the good standing of the Company, dated as of a recent

date;

Resolutions adopted by the Board of Directors of the Company (the “Resolutions”), relating to the

issuance of the Shares, certified as of the date hereof by an officer of the Company;

A certificate executed by an officer of the Company, dated as of the date hereof; and

Such other documents, records, certificates, memoranda, other instruments and matters as we have deemed

necessary or appropriate to express the opinion set forth below, subject to the assumptions, limitations and qualifications stated herein.

As to factual matters material to the opinion expressed herein which were not independently established or verified, we have relied, to the extent we have

deemed reasonably appropriate, upon statements and representations of officers or directors of the Company.

In expressing the opinion set forth below, we

have assumed (but not verified) the following:

Each individual executing any of the Documents, whether on behalf of such individual or another person, is

legally competent to do so.

Each individual executing any of the Documents on behalf of a party (other than the Company) is duly authorized

to do so.

Each of the parties (other than the Company) executing any of the Documents has duly and validly executed and

delivered each of the Documents to which such party is a signatory, and the obligations of each party set forth therein are legal, valid and binding and are enforceable in accordance with all stated terms.

All Documents submitted to us as originals are authentic. The form and content of all Documents submitted to us

as unexecuted drafts do not differ in any respect relevant to this opinion from the form and content of such Documents as executed and delivered. All Documents submitted to us as certified or photostatic copies conform to the original documents. All

signatures on all Documents are genuine. All public records reviewed or relied upon by us or on our behalf are true and complete. All representations, warranties, statements and information contained in the Documents are true and complete. There has

been no oral or written modification of or amendment to any of the Documents, and there has been no waiver of any provision of any of the Documents, by action or omission of the parties or otherwise.

None of the Shares were or will be issued, sold or transferred in violation of any restriction on transfer set

forth in Article V of the By-laws.

Upon the issuance of any of the Shares, the total number of shares of Common Stock issued and outstanding will

not exceed the total number of shares of Common Stock that the Company is then authorized to issue under the Charter.

Based upon the

foregoing, and subject to the assumptions, limitations and qualifications stated herein, it is our opinion that the Shares have been duly authorized and are validly issued, fully paid and nonassessable.

The foregoing opinion is limited to the corporate laws of the State of Florida as in effect on the date hereof and we do not express any opinion herein

concerning any other law. We express no opinion and provide no assurance as to the applicability or effect of any federal or state securities laws, rules or regulations. including the securities laws of the State of Florida, or as to federal or

state laws regarding fraudulent transfers. To the extent that any matter as to which our opinion is expressed herein would be governed by any laws other than the corporate laws of the State of Florida as in effect on the date hereof, we do not

express any opinion on such matter. The opinion expressed herein is subject to the effect of judicial decisions which may permit the introduction of parol evidence to modify the terms or the interpretation of agreements.

This opinion is rendered solely in connection with the registration of the Shares for resale by the Selling Shareholders under the Registration Statement

pursuant to the Prospectus Supplement. The opinion expressed herein is limited to the matters specifically set forth herein and no other opinion shall be inferred beyond the matters expressly stated. We assume no obligation to supplement this

opinion if any applicable law changes after the date hereof or if we become aware of any fact that might change the opinion expressed herein after the date hereof.

This opinion is being furnished to you for submission to the Commission as an exhibit to the Company’s Current Report on Form 8-K relating to the Shares (the “Current Report”). We hereby consent to the filing of this opinion as an exhibit to the Current Report and to the use of the name of our firm therein and under the caption

“Legal Matters” in the Prospectus Supplement. In giving this consent, we do not admit that we are within the category of persons whose consent is required by Section 7 of the Securities Act, or the rules and regulations of the

Commission thereunder.

Very truly yours,

/s/ Holland & Knight LLP

Holland & Knight LLP

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