Exhibit 99.1

For Immediate Release

MasTec Announces 2014 First Quarter Results, Raises Full-year

Revenue Projection and Reaffirms Earnings and EBITDA Guidance

Coral Gables, FL (May 1, 2014) — MasTec, Inc. (NYSE: MTZ) today announced 2014 first quarter financial results.

Despite the impact of severe winter weather disruptions, 2014 first quarter revenue increased 5% to $964 million from $919 million in the prior year quarter. The quarterly revenue increase was primarily driven by a 19% increase in the Oil and Gas segment and a 5% increase in Communications, reflecting a 27% increase in wireless projects. Net income from continuing operations was $16.2 million, or $0.19 per diluted share, compared to $19.3 million, or $0.23 per diluted share for the first quarter of 2013.

First quarter 2014 adjusted net income from continuing operations, a non-GAAP measure, was $18.2 million compared to $24.2 million in 2013. First quarter 2014 continuing operations adjusted diluted earnings per share, a non-GAAP measure, was $0.21 compared to $0.29 in 2013. First quarter continuing operations adjusted EBITDA, also a non-GAAP measure, was $75 million compared $81 million in 2013.

Adjusted net income from continuing operations, continuing operations adjusted diluted earnings per share and continuing operations adjusted EBITDA, non-GAAP measures exclude the impact of discontinued operations, loss on extinguishment of debt from the 2013 refinancing of our senior notes due 2017 and non-cash stock based compensation expense. Reconciliations of these and other non-GAAP measures to GAAP-reported measures are attached.

Jose R. Mas, MasTec’s Chief Executive Officer, commented, “Despite a slow start to the year due to wide spread and severe winter weather disruptions, we continue to see excellent long-term momentum in the markets that we serve. We expect another record year in 2014 and continue to be excited about growth opportunities in 2015 and beyond.”

George Pita, MasTec’s Executive Vice President and CFO, added, “First quarter results were in line with our expectations despite the adverse weather conditions that impacted much of the U.S. This decreased work productivity and delayed the billings and collections process negatively impacting financial performance and cash flow on a year-over-year basis. As these factors normalize, we expect improved performance in the second quarter, as well as strong financial performance in the second half of 2014.”

Today, the Company is raising full year 2014 revenue and reaffirming earnings and EBITDA guidance and adding guidance for the second quarter. The Company currently estimates 2014 revenue of approximately $4.7 to $4.8 billion. 2014 continuing operations adjusted EBITDA, a non-GAAP measure, is estimated at $520 to $525 million, with continuing operations adjusted diluted earnings per share at $2.27 to $2.30.

For the second quarter of 2014, the Company expects revenue of approximately $1.15 to $1.20 billion. Second quarter 2014 continuing operations adjusted EBITDA, a non-GAAP measure, is estimated at $124 million with continuing operations adjusted diluted earnings per share, a non-GAAP measure, estimated at $0.53.

Estimated 2014 non-GAAP measures are calculated on a basis consistent with historical non-GAAP measures. Reconciliations of these and other non-GAAP measures to GAAP-reported measures are attached.

Management will hold a conference call to discuss these results on Friday, May 2, 2014 at 9:00 a.m. Eastern time. The call-in number for the conference call is (913) 312-0664 and the replay number is (719) 457-0820, with a pass code of 7523811. 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.

Summary financial statements for the quarters are as follows:

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 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 energy, utility and communications infrastructure, such as: electrical utility transmission and distribution; natural gas and petroleum pipeline infrastructure; wireless, wireline and satellite communications; power generation, including renewable energy infrastructure; 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. Jose Mas, CEO of MasTec, has led the Company since April of 2007.

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 the effect of economic downturns on demand for our services, reduced capital expenditures by our customers, reduced financing availability, customer consolidation and technological and regulatory changes in the industries we serve; market conditions, technological developments and regulatory changes that affect us or our customers’ industries; trends in electricity, oil, natural gas and other energy source prices; 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; 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; any exposure related to divested businesses; any exposure resulting from system or information technology interruptions or data security breaches; the impact of U.S. federal, local or state tax legislation and other regulations 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; fluctuations in foreign currencies; risks associated with operating in 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; the highly competitive nature of our industry; 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, convertible 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 as a result of conversions of convertible notes or other stock issuances; our ability to settle conversions of our convertible notes in cash due to contractual restrictions, including those contained in our credit facility, and the availability of cash; 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.