Exhibit 99.1

For Immediate Release

MasTec Announces Second Quarter 2023 Financial Results with Record Revenue and Updates Guidance for the Year

Coral Gables, FL (August 3, 2023) — MasTec, Inc. (NYSE: MTZ) today announced 2023 second quarter financial results and updated its full year 2023 guidance range expectation.

Second quarter 2023 revenue was up 25% to $2.87 billion, compared to $2.30 billion for the second quarter of 2022. GAAP net income was $16.8 million, or $0.20 per diluted share, compared to net income of $16.3 million, or $0.20 per diluted share, in the second quarter of 2022. Second quarter results include acquisition and integration costs of $22.7 million related primarily to 2022 acquisition activity.

Second quarter 2023 adjusted net income and adjusted diluted earnings per share, both non-GAAP measures, were $70.7 million and $0.89, respectively, as compared to adjusted net income and adjusted diluted earnings per share of $56.0 million and $0.73, respectively, in the second quarter of 2022. Second quarter 2023 adjusted EBITDA, also a non-GAAP measure, increased 43% to $255.4 million, compared to $178.5 million in the second quarter of 2022. Second quarter 2023 results reflect the impact of strong sequential and year over year financial performance improvement over the comparable period last year and the impact of the acquisition of IEA.

18-month backlog as of June 30, 2023, was $13.4 billion, up 22% compared to last year’s second quarter.

Adjusted net income, adjusted diluted earnings per share, and adjusted EBITDA, 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, “All of our segments showed improved margin performance this quarter compared to the comparable quarter last year. Our Clean Energy and Infrastructure segment showed the most improvement with an approximately 400 basis point sequential improvement in adjusted EBITDA margin in the second quarter and an approximately 600 basis point improvement over the second quarter last year. While margins improved as expected, we did begin to see tighter management of CAPEX by a number of customers. We also expect revenue at recently acquired IEA to be impacted in the second half because of project delays, with revenue being pushed into 2024.”

Mr. Mas continued, “We have strong growth potential in all of our markets, and we are well-positioned to capitalize on these opportunities in all of our segments. While we are disappointed with the second half revenue expectations, our focus on improving margins has materialized and we expect this to continue in the second half of 2023 and we expect to enter 2024 with significant revenue growth and margin expansion.”

Paul DiMarco, MasTec’s Executive Vice President and Chief Financial Officer, noted, “MasTec had record revenue and adjusted EBITDA for the second quarter. Additionally, we made progress on our collections with DSO improving by 4 days. We remain on track to meet our year-end net debt leverage goal of low 2 times. The balance sheet remains strong with approximately $900 million in liquidity, and we are ready to support the strong growth expected in all segments.”

Based on the information available today, the Company is providing third quarter and updating full year 2023 guidance. The Company currently expects full year 2023 revenue to range from $12.7 billion to $13.0 billion. GAAP net income and diluted earnings per share for full year 2023 are expected to range between $111 million and $141 million and $1.38 and $1.77, respectively. Full year 2023 adjusted EBITDA is expected to range between $1.05 billion and $1.10 billion, representing between 8.2% and 8.5% of revenue, and adjusted diluted earnings per share is expected to range between $3.75 and $4.19.

For the third quarter of 2023, the Company expects revenue to range from $3.8 billion to $3.9 billion. Third quarter 2023 GAAP net income is expected to range between $101 million and $122 million, with GAAP diluted earnings per share expected to range between $1.27 and $1.55. Third quarter 2023 adjusted EBITDA is expected to approximate $360 million to $390 million or 9.6% to 10.1% of revenue, with adjusted diluted earnings per share expected to be $1.85 to $2.13.

Management will hold a conference call to discuss these results on Friday, August 4, 2023 at 9:00 a.m. Eastern Time. The call-in number for the conference call is (856) 344-9221 or (888) 394-8218 with a pass code of 3225603. Additionally, the call will be broadcast live over the Internet and can be accessed and replayed for 60 days through the Investors section of the Company’s website at www.mastec.com. Presentation materials in support of the call, along with a guidance summary document, are also available adjacent to the webcast link.

The following tables set forth the financial results for the periods ended June 30, 2023 and 2022:

Consolidated Statements of Operations

(unaudited - in thousands, except per share information)

Consolidated Balance Sheets

(unaudited - in thousands)

Consolidated Statements of Cash Flows

(unaudited - in thousands)

Backlog is a common measurement used in our industry. Our methodology for determining backlog may not, however, be comparable to the methodologies used by others. Estimated backlog represents the amount of revenue we expect to realize over the next 18 months from future work on uncompleted construction contracts, including new contracts under which work has not begun, as well as revenue from change orders and renewal options. Our estimated backlog also includes amounts under master service and other service agreements and our proportionate share of estimated revenue from proportionately consolidated non-controlled contractual joint ventures. Estimated backlog for work under master service and other service agreements is determined based on historical trends, anticipated seasonal impacts, experience from similar projects and estimates of customer demand based on communications with our customers.

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

Note: The Communications, Clean Energy and Infrastructure, and Power Delivery segments represent the “non-Oil & Gas” segments.

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

NM - Percentage is not meaningful

Note: The Communications, Clean Energy and Infrastructure, and Power Delivery segments represent the “non-Oil & Gas” segments.

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

Supplemental Disclosures and Reconciliation of Non-GAAP Disclosures

(unaudited - in millions, except for percentages and per share information)

The tables may contain slight summation 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, utility and other infrastructure, such as: power delivery services, including transmission, distribution, environmental planning and compliance, wireless, wireline/fiber and customer fulfillment activities; power generation, primarily from clean energy and renewable sources; pipeline distribution infrastructure, including natural gas, carbon capture sequestration, water and pipeline integrity services; heavy civil; industrial infrastructure; and environmental remediation services. 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 and webcasts on the Events & Presentations page in the Investors section therein.

This presentation contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act. Forward-looking statements include, but are not limited to, statements relating to expectations regarding the future financial and operational performance of MasTec; expectations regarding MasTec’s business or financial outlook; expectations regarding MasTec’s plans, strategies and opportunities; expectations regarding opportunities, technological developments, competitive positioning, future economic conditions and other trends in particular markets or industries; the impact of inflation on MasTec’s costs and the ability to recover increased costs, as well as other statements reflecting expectations, intentions, assumptions or beliefs about future events and other statements that do not relate strictly to historical or current facts. These statements are based on currently available operating, financial, economic and other information, and are subject to a number of significant risks and uncertainties. A variety of factors in addition to those mentioned above, many of which are beyond our control, could cause actual future results to differ materially from those projected in the forward-looking statements. Other factors that might cause such a difference include, but are not limited to: market conditions, including levels of inflation, rising interest rates or supply chain issues, technological developments, regulatory or policy changes, including permitting processes and tax incentives that affect us or our customers’ industries; the effect of federal, local, state, foreign or tax legislation and other regulations affecting the industries we serve and related projects and expenditures; the effect on demand for our services of changes in the amount of capital expenditures by our customers due to, among other things, economic conditions, including the potential adverse effects of potential recessionary concerns, inflationary issues, supply chain disruptions and higher interest rates, the availability and cost of financing, climate-related matters, customer consolidation in the industries we serve and/or the effects of public health matters; activity in the industries we serve and the impact on our customers’ expenditure levels caused by fluctuations in commodity prices, including for fuel and energy sources, and/or fluctuations in materials, labor, supplies, equipment and other costs, or supply-related issues that affect availability or cause delays for such items; our ability to manage projects effectively and in accordance with our estimates, as well as 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 estimates of the recoverability of change orders; risks related to completed or potential acquisitions, such as IEA, including our ability to integrate acquired businesses within expected timeframes, including their business operations, internal controls and/or systems, which may be found to have material weaknesses, and our ability to achieve the revenue, cost savings and earnings levels from such acquisitions at or above the levels projected, as well as the risk of potential asset impairment charges and write-downs of goodwill; our ability to attract and retain qualified personnel, key management and skilled employees, including from acquired businesses, our ability to enforce any noncompetition agreements, and our ability to maintain a workforce based upon current and anticipated workloads; any material changes in estimates for legal costs or case settlements or adverse determinations on any claim, lawsuit or proceeding; the adequacy of our insurance, legal and other reserves; the timing and extent of fluctuations in operational, geographic and weather factors affecting our customers, projects and the industries in which we operate; the highly competitive nature of our industry and 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, and/or customer disputes related to our performance of services and the resolution of unapproved change orders; requirements of and restrictions imposed by our credit facility, term loans, senior notes and any future loans or securities; the effect of state and federal regulatory initiatives, including risks related to the costs of compliance with existing and potential future environmental, social and governance requirements, including with respect to climate-related matters; our dependence on a limited number of customers and our ability to replace non-recurring projects with new projects; risks associated with potential environmental issues and other hazards from our operations; disputes with, or failures of, our subcontractors to deliver agreed-upon supplies or services in a timely fashion, and the risk of being required to pay our subcontractors even if our customers do not pay us; any exposure resulting from system or information technology interruptions or data security breaches; the outcome of our plans for future operations, growth and services, including business development efforts, backlog, acquisitions and dispositions; risks related to our strategic arrangements, including our equity investments; risks associated with volatility of our stock price or any dilution or stock price volatility that shareholders may experience in connection with shares we may issue as purchase consideration in connection with past or future acquisitions, or as consideration for earn-out obligations or as a result of other stock issuances; our ability to obtain performance and surety bonds; risks related to our operations that employ a unionized workforce, including labor availability, productivity and relations, as well as risks associated with multiemployer union pension plans, including underfunding and withdrawal liabilities; risks associated with operating in or expanding into additional international markets, including risks from fluctuations in foreign currencies, foreign labor and general business conditions and risks from failure to comply with laws applicable to our foreign activities and/or governmental policy uncertainty; risks associated with material

weaknesses in our internal control over financial reporting and our ability to remediate such weaknesses; a small number of our existing shareholders have the ability to influence major corporate decisions, as well as other risks detailed in our filings with the Securities and Exchange Commission. We believe these forward-looking statements are reasonable; however, you should not place undue reliance on any forward-looking statements, which are based on current expectations. Furthermore, forward-looking statements speak only as of the date they are made. If any of these risks or uncertainties materialize, or if any of our underlying assumptions are incorrect, our actual results may differ significantly from the results that we express in, or imply by, any of our forward-looking statements. These and other risks are detailed in our filings with the Securities and Exchange Commission. We do not undertake any obligation to publicly update or revise these forward-looking statements after the date of this press release to reflect future events or circumstances, except as required by applicable law. We qualify any and all of our forward-looking statements by these cautionary factors.