For Immediate Release

MasTec Announces Fourth Quarter and Annual Results, Amended and Expanded Credit Facility and Issues 2017 Guidance

Coral Gables, FL (February 23, 2017) — MasTec, Inc. (NYSE: MTZ) today announced better than expected 2016 fourth quarter and full year financial results, and issued its initial 2017 guidance range.

The Company also reported:

Adjusted net income, adjusted diluted earnings per share, adjusted EBITDA and book leverage ratio, which are all non-GAAP measures, exclude certain items which are detailed and reconciled to the most comparable GAAP-reported measures in the attached Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures.

Jose Mas, MasTec’s Chief Executive Officer, commented, “We exceeded our fourth quarter expectations, driven primarily by improved productivity in our Oil & Gas segment. We also signed pipeline contracts approximating $1.7 billion during the quarter, ending the year, as expected, with record Oil & Gas segment backlog. We expect record results for our Oil & Gas segment in 2017 and continue to have clear visibility to continued opportunities in this segment for several years.”

Mr. Mas continued, “I want to thank the men and women of MasTec for their dedicated efforts during 2016 and look forward to a great 2017 and beyond.”

The company also announced that it has entered into an amended and restated credit facility with a syndicate of lenders led by Bank of America, N.A. and SunTrust Bank, which increased the capacity under the senior secured credit facility by over $250 million to $1.5 billion and extended the maturity date of the facility to February 2022. The amended credit facility also contains more favorable terms and provides additional flexibility for borrowings in foreign currencies.

George Pita, MasTec’s Executive Vice President and Chief Financial Officer noted, “We had strong financial performance and working capital management during 2016, enabling us to significantly improve our leverage ratios, despite the working capital usage associated with over $900 million in organic revenue growth during the year. We appreciate the continued support and confidence of the financial institutions involved in our credit facility. The amended facility further strengthens our capital structure and liquidity, allowing us full financial flexibility to take advantage of the significant growth opportunities in the markets we serve.”

Based on the information available today, the Company is providing both first quarter and full year 2017 guidance. The Company currently estimates 2017 revenue will increase 7% to approximately $5.5 billion. 2017 full year GAAP net income is expected to approximate $188 million, with adjusted EBITDA, a non-GAAP measure, expected to increase 15% to $550 million. 2017 full year GAAP diluted earnings per share are expected to be $2.24, a 39% increase over 2016, with adjusted diluted earnings per share, a non-GAAP measure, expected to be $2.35, a 24% increase over 2016.

For the first quarter of 2017, the Company expects revenue of approximately $1.05 billion. First quarter 2017 GAAP net income is expected to approximate $40 million, with adjusted EBITDA, a non-GAAP measure, expected to increase 132% and approximate $125 million. First quarter 2017 GAAP diluted earnings per share are expected to approximate $0.48 with adjusted diluted earnings per share, a non-GAAP measure, expected to approximate $0.51. First quarter 2017 guidance reflects expected improved Oil & Gas segment performance due to higher revenues and efficiencies, as well as improvement in the Electrical Transmission segment results.

Management will hold a conference call to discuss these results on Friday, February 24, 2017 at 9:00 a.m. Eastern time. The call-in number for the conference call is (719) 457-2601 and the replay number is (719) 457-0820, with a pass code of 6638861. The replay will be available for 30 days. Additionally, the call will be broadcast live over the Internet and can be accessed and replayed through the Investors section of the Company’s website at www.mastec.com.

The following tables set forth the financial results for the periods ended December 31, 2016 and 2015:

Condensed Unaudited Consolidated Statements of Operations

(In thousands, except per share amounts)

Condensed Unaudited Consolidated Balance Sheets

(In thousands)

Condensed Unaudited Consolidated Statements of Cash Flows

(In thousands)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures – Unaudited

(In millions, except for book leverage ratios)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures – Unaudited

(In millions, except for percentages and per share amounts)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures – Unaudited

(In millions, except for percentages and per share amounts)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures – Unaudited

(In millions, except for percentages and per share amounts)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures – Unaudited

(In millions, except for percentages and per share amounts)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures – Unaudited

(In millions, except for percentages and per share amounts)

Tables may contain differences due to rounding.

MasTec, Inc. is a leading infrastructure construction company operating mainly throughout North America across a range of industries. The Company’s primary activities include the engineering, building, installation, maintenance and upgrade of communications, energy and utility infrastructure, such as: wireless, wireline/fiber, satellite communications and customer fulfillment activities; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; power generation; and industrial infrastructure. MasTec’s customers are primarily in these industries. The Company’s corporate website is located at www.mastec.com. The Company’s website should be considered as a recognized channel of distribution, and the Company may periodically post important, or supplemental, information regarding contracts, awards or other related news on the Presentations/Webcasts page in the Investors section therein.

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act. These statements are based on management’s current expectations and are subject to a number of risks, uncertainties, and assumptions, including trends in oil, natural gas, electricity and other energy source prices; volatility in capital expenditures by our customers, financing availability and cost, customer consolidation and technological and regulatory changes in the industries we serve; our ability to accurately estimate the costs associated with our fixed price and other contracts, including any material changes in estimates for completion of projects, and performance on such projects; our ability to manage projects effectively and in accordance with our estimates; the effect of economic conditions on demand for our services; market conditions, technological developments and regulatory changes that affect us or our customers’ industries; the highly competitive nature of our industry; risks related to our strategic arrangements, including our cost and equity investees; fluctuations in foreign currencies; risks associated with operating in or expanding into additional international markets, which could restrict our ability to expand globally and harm our business and prospects or any failure to comply with laws applicable to our foreign activities; customer disputes related to our performance of services; disputes with, or failures of, our subcontractors to deliver agreed-upon supplies or services in a timely fashion; any material changes in estimates for legal costs or case settlements or adverse determinations on any claim, lawsuit or proceeding; our ability to replace non-recurring projects with new projects; the timing and extent of fluctuations in geographic, weather, equipment and operational factors affecting the industries in which we operate; our ability to attract and retain qualified personnel, key management and skilled employees, including from acquired businesses, and our ability to enforce any noncompetition agreements, integrate acquired businesses within expected timeframes and achieve the revenue, cost savings and earnings levels from such acquisitions at or above the levels projected, including the risk of potential asset impairment charges, including write-downs of goodwill; any exposure related to divested businesses; any exposure resulting from system or information technology interruptions or data security breaches; risks related to the restatement of certain of our fiscal year 2014 interim financial statements; the impact of U.S. federal, local or state tax legislation and other regulations affecting corporate income taxes, as well as, those affecting renewable energy, electricity prices, electrical transmission, oil and gas production, broadband and related projects and expenditures; the effect of state and federal regulatory initiatives, including costs of compliance with existing and future environmental requirements; increases in fuel, maintenance, materials, labor and other costs; our dependence on a limited number of customers; the ability of our customers, including our largest customers, to terminate or reduce the amount of work, or in some cases, the prices paid for services on short or no notice under our contracts; the impact of any unionized workforce on our operations, including labor availability and relations; liabilities associated with multi-employer pension plans, including underfunding and withdrawal liabilities, for our operations that employ unionized workers; the adequacy of our insurance, legal and other reserves and allowances for doubtful accounts; restrictions imposed by our credit facility, senior notes, and any future loans or securities; our ability to obtain performance and surety bonds; the outcome of our plans for future operations, growth and services, including business development efforts, backlog, acquisitions and dispositions; any dilution or stock price volatility that shareholders may experience in connection with shares we may issue as consideration for earn-out obligations or as purchase consideration in connection with past or future acquisitions, or other stock issuances; as well as other risks detailed in our filings with the Securities and Exchange Commission. Actual results may differ significantly from results expressed or implied in these statements. We do not undertake any obligation to update forward-looking statements.