Exhibit 99.1

PRIMORIS SERVICES CORPORATION ANNOUNCES 2012 THIRD QUARTER FINANCIAL RESULTS

Revenues of $431.8 million and Net Income of $0.34 Per Share

Board of Directors Declares $0.03 Per Share Cash Dividend

Q3 2012 Financial Highlights

·                  Revenues increased by 15.0% to a record $431.8 million from the third quarter of 2011

·                  Revenues increased by 28.0% compared to Q2 2012

·                  Net income of $17.5 million, or $0.34 per diluted share, compared to Q3 2011 net income of $19.3 million, or $0.38 per diluted share

·                  At September 30, 2012:

·            $83.0 million in cash, cash equivalents, and short-term investments

·            Total backlog of $1.14 billion, an increase of 5.2% from June 30, 2012

Dallas, TX — November 6, 2012 — Primoris Services Corporation (NASDAQ GS: PRIM) (“Primoris” or “Company”) today announced financial results for its third quarter ended September 30, 2012.

The Company also announced that on November 1, 2012 its Board of Directors declared a $0.03 per share cash dividend to stockholders of record as of December 18, 2012, payable on or about December 26, 2012.

Brian Pratt, Chairman, President and Chief Executive Officer of Primoris, commented, “Primoris’ third quarter benefited from strong performances by our ARB Industrial and Underground groups in the West segment and James Construction Group and Sprint in the East segment.  Our revenues increased by 15.0% from the third quarter of 2011 and sequentially increased by 28.0% compared to the 2012 second quarter.  While most of this revenue growth was organic, we continue to be pleased with the March acquisition of Sprint, which added $33.5 million in revenues in the current quarter.  Compared to the second quarter of 2012, we increased our operating margin and our net income improved by 49.2%.”

Mr. Pratt continued, “Based on new business awards and diverse project opportunities, we believe that we will continue to experience backlog growth both for the remainder of this year and into next.  Over the past two months, we announced new contract signings valued at over $251 million, much of which will be completed in 2012 and the first half of 2013.  The benefit of our strategy to grow the company as a diverse group of specialized construction and infrastructure companies is apparent in the breadth of the new awards, spread across our subsidiaries and end markets.  While we continue to have concerns about the macroeconomic environment, we are fortunate that strong tailwinds persist in our core markets, and we are pleased by the improving trends in our ancillary markets.  As I have said many times, it is our exceptional team that makes what we do possible, and I am proud of their continued hard work.”

2012 THIRD QUARTER RESULTS OVERVIEW

Revenues for the 2012 third quarter increased 15.0% to $431.8 million from $375.5 million for the same period last year.  The 2011 third quarter included revenue of $48.3 million for the Ruby pipeline project, substantially completed in 2011. Excluding the Ruby revenue impact, revenues for the 2012 third quarter increased by $104.6 million, or 32.0%.  The

increased revenues are primarily as a result of increased project work in the West Construction Services segment for both industrial and underground projects, as well as the impact of the March 2012 acquisition of Sprint, which contributed $33.5 million in revenue for the three months ended September 30, 2012.  Gross profit for the 2012 third quarter rose by 8.0% to $56.3 million, or 13.0% of revenues, from $52.1 million, or 13.9% of 2011 third quarter revenue.  Gross profit for the 2011 third quarter included gross profit for the Ruby project of $12.7 million.  Excluding the impact of the Ruby project, gross profit for the 2012 third quarter increased by $16.4 million compared to the same period in the previous year.  Higher gross profit was due primarily to the increased project work in the West Construction Services segment as well as the gross profit contribution from the March 2012 acquisition of Sprint, which contributed $6.3 million to gross profit for the 2012 third quarter.

SEGMENT RESULTS

·              East Construction Services — located primarily in the southeastern United States, incorporates the construction business of James Construction Group (JCG), Cardinal Contractors, Inc.’s water and wastewater, and Sprint Pipeline Services LP, acquired in March 2012.

·              West Construction Services — includes construction services performed by companies headquartered in the western United States including ARB, Inc., ARB Structures, Inc. and Rockford. The Blythe Power Constructors joint venture is also included as part of West Construction Services.

·              Engineering — incorporates the results of Onquest, Inc. and Born Heaters Canada, ULC.

Segment Revenues

(in thousands, except %)

Segment Gross Profit

(in thousands, except %)

East Construction Services:  Revenues increased by $50.6 million in the 2012 third quarter, primarily due to the March 2012 acquisition of Sprint, which generated $33.5 million in revenue for the quarter.  Excluding the impact of Sprint, revenues increased by $17.1 million due primarily to increased industrial work in petrochemical and fertilizer facilities as a result of lower natural gas prices in the Gulf Coast area as well as increases in infrastructure and maintenance work related to the number and size of projects in petrochemical and power facilities.  Gross profit increased by $3.3 million in the 2012 third quarter, including $6.3 million of gross profit contribution from the Sprint acquisition.  Excluding the impact of the Sprint acquisition, decreased gross profit of $3.0 million was a result of lower margins of heavy civil projects, primarily due to larger highway projects in Louisiana in the prior year quarter.

West Construction Services:  Revenues increased by $11.1 million in the 2012 third quarter.  The 2011 third quarter included $48.3 million in revenues from the Ruby project.  Excluding the Ruby project revenues, revenues increased by $59.4 million in the 2012 third quarter, due primarily to a $17.7 million increase in the California underground business, a $10.3 million increase in the California industrial business, and $33.5 million for work in the Marcellus gas shale region. A significant contributor to the underground business was pipeline integrity work for the major California gas utilities, while work on power plants provided a major increase to the industrial business.  Excluding the 2011 third quarter Ruby project gross profit of $12.7 million, gross profit for the 2012 third quarter increased by $13.4 million, driven by the significant increase in volume in both the underground and industrial projects.

Engineering: Revenues decreased by $5.3 million, mainly due to the completion early in the quarter of several furnace upgrade and refurbishment projects for two major U.S. chemical companies.  Gross profit decreased by $0.4 million, primarily as the result of lower profit margins achieved on international projects at our Canadian location and higher margin project closeouts in the prior year.

Selling, general and administrative expenses (“SG&A”) were $26.0 million, or 6.0% of revenues for the 2012 third quarter, compared to $23.4 million, or 6.9% of revenues for the 2012 second quarter, an increase of $2.6 million.  The increased SG&A included a $0.7 million increase as a result of the Sprint acquisition and an increase of $1.9 million in compensation and compensation-related expenses, largely due to the costs of increased personnel associated with the higher volume of work.  Excluding the impact of Sprint, SG&A as a percentage of revenues was 5.8% for the 2012 third quarter.

Operating income for the 2012 third quarter was $30.3 million, or 7.0% of total revenues, compared to $32.0 million, or 8.5% of total revenues, for the same period last year.

Net other income and expenses in the 2012 third quarter was an expense of $1.4 million, a $1.3 million decline from net other income of $0.1 million in the 2011 third quarter.  The decline was primarily due to the near completion of the St. Bernard Levee Partners joint venture.

The provision for income taxes for the 2012 third quarter was $11.0 million.  The effective tax rate excluding income attributable to noncontrolling interests was 38.5% for the 2012 third quarter, compared to 39.7% in the prior year quarter.

Net income attributable to Primoris for the 2012 third quarter was $17.5 million, or $0.34 per diluted share, compared to net income of $19.3 million, or $0.38 per diluted share, in the same period in 2011.

Fully diluted shares outstanding for the 2012 third quarter increased by 0.7% to 51.4 million from 51.1 million in last year’s third quarter.  The increase was mainly due to shares issued as a result of Rockford meeting a defined performance target in 2011.  During the 2012 third quarter, the Company did not repurchase any shares of stock under the previously announced share repurchase program.

OTHER FINANCIAL INFORMATION

Primoris’s balance sheet at September 30, 2012 included cash and cash equivalents of $76.7 million, working capital of $106.1 million, total debt and capital leases secured by equipment of $81.7 million and stockholders’ equity of $316.2 million.  The balance sheet included a $14.9 million liability representing the estimated fair value for potential earn-out payments for Rockford’s financial performance for 2012, Sprint’s performance for 2012 and 2013, and Saxon’s performance for 2013 or 2014.

BACKLOG

At September 30, 2012, total backlog was $1.14 billion compared to $1.17 billion at December 31, 2011.  Primoris expects that approximately 26% of total backlog at September 30, 2012 will be recognized as revenue during the fourth quarter of 2012, with $155 million expected for the East Construction Services segment, $133 million for the West Construction Services segment and $8 million for the Engineering segment.  Primoris expects that an additional 48% of backlog will be recognized as revenue in 2013.

Backlog should not be considered a comprehensive indicator of future revenues, as a significant portion of Primoris’s revenues are derived from projects that are not part of a backlog calculation and projects that are considered a part of backlog may be cancelled by our customers.  For the nine months ended September 30, 2012, approximately $201.1 million of revenue was generated by projects that were not included in backlog.

CONFERENCE CALL

Brian Pratt, Chairman, President and Chief Executive Officer, and Peter J. Moerbeek, Executive Vice President and Chief Financial Officer will host a conference call today, Tuesday, November 6, 2012 at 11:30 am Eastern Time / 10:30 am Central Time to discuss the results.

Interested parties may participate in the call by dialing:

·            (877) 407-8029 (Domestic)

·            (201) 689-8029 (International)

The conference call will also be broadcasted live via the Investor Relations section of Primoris’s website at www.prim.com.  Once at the Investor Relations section, please click on “Events & Presentations”.  If you are unable to participate in the live call, the conference call will be archived and can be accessed for approximately 90 days.

ABOUT PRIMORIS

Founded in 1946, Primoris, through various subsidiaries, has grown to become one of the largest specialty contractors and infrastructure companies in the United States. Serving diverse end markets, Primoris provides a wide range of construction, fabrication, maintenance, replacement, water and wastewater, and engineering services to major public utilities, petrochemical companies, energy companies, municipalities, and other customers. Since December 2009, Primoris has more than doubled its size and the Company’s national footprint now extends from Florida, along the Gulf Coast, through California, into the Pacific Northwest and Canada.  For additional information, please visit www.prim.com

FORWARD LOOKING STATEMENTS

This press release contains certain forward-looking statements, including with regard to the Company’s future performance. Words such as “estimated,” “believes,” “expects,” “projects,” “may,” and “future” or similar expressions are intended to identify forward-looking statements.  Forward-looking statements inherently involve risks and uncertainties, including without limitation, those described in this press release and those detailed in the “Risk Factors” section and other portions of our Quarterly Report on Form 10-Q for the period ended September 30, 2012, which we expect to file on November 6, 2012, and other filings with the Securities and Exchange Commission.  Primoris does not undertake any obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In Thousands, Except Per Share Amounts)

(Unaudited)

CONDENSED CONSOLIDATED BALANCE SHEETS

 (In Thousands, Except Share Amounts)

(Unaudited)