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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

For the Quarterly Period Ended June 30, 2015

Commission File No. 0-21886

BARRETT BUSINESS SERVICES, INC.

(Exact name of registrant as specified in its charter)

(360) 828-0700

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company (as defined in Rule 12b-2 of the Exchange Act).

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Number of shares of common stock, $.01 par value, outstanding at July 31, 2015 was 7,202,062 shares.

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BARRETT BUSINESS SERVICES, INC.

INDEX

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Part I - Financial Information

BARRETT BUSINESS SERVICES, INC.

Consolidated Balance Sheets

(Unaudited)

(In thousands, except per share amounts)

The accompanying notes are an integral part of these consolidated financial statements

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BARRETT BUSINESS SERVICES, INC.

Consolidated Statements of Operations

(Unaudited)

(In thousands, except per share amounts)

The accompanying notes are an integral part of these consolidated financial statements

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BARRETT BUSINESS SERVICES, INC.

Consolidated Statements of Operations

(Unaudited)

(In thousands, except per share amounts)

The accompanying notes are an integral part of these consolidated financial statements

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BARRETT BUSINESS SERVICES, INC.

Consolidated Statements of Comprehensive Income

(Unaudited)

(In thousands)

The accompanying notes are an integral part of these consolidated financial statements

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BARRETT BUSINESS SERVICES, INC.

Consolidated Statements of Stockholders’ Equity

Six Months Ended June 30, 2015 and 2014

(Unaudited)

(In thousands)

The accompanying notes are an integral part of these consolidated financial statements

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BARRETT BUSINESS SERVICES, INC.

Consolidated Statements of Cash Flows

(Unaudited)

(In thousands)

The accompanying notes are an integral part of these consolidated financial statements

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited)

Note 1 - Basis of Presentation of Interim Period Statements

The accompanying consolidated financial statements are unaudited and have been prepared by Barrett Business Services, Inc. (“Barrett”, “BBSI”, the “Company”, “our” or “we”), pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures typically included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the consolidated financial statements include all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods presented. The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results may differ from such estimates and assumptions. The consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2014 Annual Report on Form 10-K at pages F1 – F34. The results of operations for an interim period are not necessarily indicative of the results of operations for a full year.

Revenue recognition

We recognize revenue as services are rendered by our workforce. Professional employer (PEO) services are normally used by organizations to satisfy ongoing needs related to the management of human capital and are governed by the terms of a client services agreement with a minimum term of one year, which cover all employees at a particular work site. Our client services agreements are renewable on an annual basis and typically require 30 days’ written notice to cancel or terminate the contract by either party. Our client services agreements provide for immediate termination upon any default of the client regardless of when notice is given. We report PEO revenues on a net basis because we are not the primary obligor for the services provided by our co-employed clients to their customers pursuant to our client services agreements. Consequently, these service fee revenues represent the gross margin generated from our professional employer services after deducting the amounts invoiced to clients for direct payroll expenses such as salaries, wages, health insurance, employee out-of-pocket expenses incurred incidental to employment, and safety incentives. These amounts are also excluded from cost of revenues. Professional employer service fees also include amounts invoiced to our clients for employer payroll-related taxes and workers’ compensation coverage. Staffing services are engaged by customers to meet short-term and long-term personnel needs.

Marketable securities

As of June 30, 2015, the Company’s marketable securities consisted of tax-exempt municipal securities, corporate bonds and U.S. Treasuries. The Company classifies municipal securities, corporate bonds and U.S. Treasuries as available for sale; they are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Management considers available evidence in evaluating potential impairment of investments, including the duration and extent to which fair value is less than cost and the Company’s ability and intent to hold the investments. In the event a loss is determined to be other-than-temporary, the loss will be recognized in the statement of operations.

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited)

Note 1 - Basis of Presentation of Interim Period Statements (Continued)

Allowance for doubtful accounts

The Company had an allowance for doubtful accounts of $222,000 and $291,000 at June 30, 2015 and December 31, 2014, respectively. The Company must make estimates of the collectability of accounts receivable for services provided to customers. Management analyzes historical bad debts, customer concentrations, customer credit-worthiness, current economic conditions, and changes in customers’ payment trends when evaluating the adequacy of the allowance for doubtful accounts. If the financial condition of our customers deteriorates, resulting in an impairment of their ability to make payments, additional allowances may be required.

Workers’ compensation claims

The Company is a self-insured employer with respect to workers’ compensation coverage for all of its employees (including employees co-employed through our client service agreements) working in Oregon, Maryland, Delaware and Colorado, except as described below. In the state of Washington, state law allows only the Company’s staffing services and internal management employees to be covered under the Company’s self-insured workers’ compensation program. Additionally, the Company operates a wholly owned fully licensed insurance company, Ecole Insurance Company (“Ecole”), in Arizona to provide workers’ compensation coverage to our employees in Arizona.

Effective January 1, 2015, the Company no longer maintains a certificate to self-insure in the state of California and now maintains individual policies with ACE Group (“ACE”) for all California-based clients. The arrangement, typically known as a fronted program, provides BBSI a licensed, admitted insurance carrier in California to issue policies on behalf of BBSI without the intention of transferring any of the workers’ compensation risk for the first $5.0 million per claim. The risk of loss up to the first $5.0 million per claim is retained by BBSI through an indemnity agreement. While this portion of the risk of loss remains with BBSI, ACE assumes credit risk should BBSI be unable to satisfy its indemnification obligations to ACE. ACE also bears the economic burden for all costs in excess of $5.0 million per claim. The agreement is effective through January 2016 with the potential for continued annual renewals thereafter.

The Company makes monthly payments into a trust account established between the Company and ACE related to the new ACE fronted insurance program to be set aside for the payment of future claims. The balance in the trust account was $109.5 million and $50.1 million at June 30, 2015 and December 31, 2014, respectively. The trust account balance is included as a component of the current and long-term restricted marketable securities and workers’ compensation deposits in the accompanying consolidated balance sheets.

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 1 - Basis of Presentation of Interim Period Statements (Continued)

Workers’ compensation claims (Continued)

To manage our financial exposure, in the event of catastrophic injuries or fatalities, the Company maintains excess workers’ compensation insurance through our wholly owned captive insurance company, Associated Insurance Company for Excess (“AICE”), with a per occurrence retention of $5.0 million, except in Maryland and Colorado, where our per occurrence retention is $1.0 million and $2.0 million, respectively. AICE maintains excess workers’ compensation insurance coverage with ACE, between $5.0 million and $15.0 million per occurrence, except in Maryland, where coverage with ACE is between $1.0 million and $25.0 million per occurrence, and in Colorado, where the coverage with ACE is between $2.0 million and statutory limits per occurrence. The Company continues to evaluate the financial capacity of its insurers to assess the recoverability of the related insurer receivables.

The Company has provided a total of $229.6 million and $216.0 million at June 30, 2015 and December 31, 2014, respectively, as an estimated future liability for unsettled workers’ compensation claims liabilities. The estimated liability for unsettled workers’ compensation claims represents management’s best estimate based upon an actuarial valuation provided by a third party actuary at June 30, 2015 and December 31, 2014. Included in the claims liabilities are case reserve estimates for reported losses, plus additional amounts based on projections for incurred but not reported claims and anticipated increases in case reserve estimates. Also included in these estimates are amounts for unallocated loss adjustment expenses, including legal costs. These estimates are continually reviewed and adjustments to liabilities are reflected in current operating results as they become known.

Our workers’ compensation claims liabilities do not represent an exact calculation of liability, but instead represent management’s best estimate, generally utilizing actuarial expertise and projection techniques, at a given accounting date. The process of estimating unpaid claims and claim adjustment expense involves a high degree of judgment and is subject to a number of variables. These variables can be affected by both internal and external events such as changes in claims handling procedures, changes in individuals involved in the reserve estimation process, inflation, legal trends and legislative changes.

Safety incentives liability

Safety incentives represent cash incentives paid to certain client companies under client service agreements for maintaining safe-work practices in order to minimize workplace injuries. The Company has provided $18.1 million at June 30, 2015 and $14.2 million at December 31, 2014 as an estimate of the liability for unpaid safety incentives. The incentive is based on a percentage of annual payroll and is paid annually to customers who meet predetermined workers’ compensation claims cost objectives. Safety incentive payments are made only after closure of all workers’ compensation claims incurred during the customer’s contract period. The liability is estimated and accrued each month based upon contract year-to-date payroll and the then-current amount of the customer’s estimated workers’ compensation claims reserves as established by us and our third-party administrator, and the expected payout as determined by historical incentive payment trends. Safety incentive expense is netted against professional employer services revenue in our consolidated statements of operations.

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 1 - Basis of Presentation of Interim Period Statements (Continued)

Statements of cash flows

Interest paid during the six months ended June 30, 2015 and 2014 did not materially differ from interest expense. Income taxes received by the Company during the six months ended June 30, 2015 totaled $1.1 million compared to income taxes paid during the six months ended June 30, 2014 of $1.3 million.

Reclassifications

Certain prior year amounts have been reclassified to conform with the 2015 presentation. Such reclassifications had no impact on the Company’s financial condition, operating results, cash, working capital or stockholders’ equity.

Accounting estimates

The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Estimates are used for carrying values of marketable securities, allowance for doubtful accounts, deferred income taxes, carrying values for goodwill and property and equipment, accrued workers’ compensation liabilities and safety incentive liabilities. Actual results may or may not differ from such estimates.

Note 2 – Recently Issued Accounting Pronouncements

Revenue recognition

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The amendments in ASU 2014-09 provide for a single, principles-based model for revenue recognition that replaces the existing revenue recognition guidance. In April 2015, the FASB voted for a one-year deferral of the effective date of ASU 2014-09. If approved, the new guidance will be effective for annual and interim periods beginning on or after December 15, 2017 and will replace most existing revenue recognition guidance under U.S. GAAP when it becomes effective. It permits the use of either a retrospective or cumulative effect transition method and early adoption is not permitted. We have not yet selected a transition method and are in the process of evaluating the effect this standard will have on our consolidated financial statements and related disclosures.

Presentation of debt issuance costs

In April 2015, the FASB issued Accounting Standards Update No. 2015-03, Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. This amends the presentation of debt issuance costs on the consolidated balance sheet, such that it requires

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 2 – Recently Issued Accounting Pronouncements (Continued)

Presentation of debt issuance costs (Continued)

debt issuance costs to be presented on the balance sheet as a direct reduction from the carrying amount of the related debt liability. The amendments in this accounting standard update are to be applied retrospectively and are effective for interim and annual reporting periods beginning after December 15, 2015. We do not expect the adoption of this accounting standard update to have a material impact on our consolidated balance sheets.

Note 3 – Revolving Credit Facility and Long-Term Debt

The Company maintains a credit agreement (the “Agreement”) with its principal bank, Wells Fargo Bank, National Association (the “Bank”). The Agreement includes a $40.0 million term loan maturing December 31, 2016, as well as a $14.0 million revolving credit line, with a $5.0 million sublimit for unsecured standby letters of credit. The outstanding balance on the term loan was $37.0 million at June 30, 2015 and $40.0 million at December 31, 2014. The Company had an outstanding balance of $3.2 million on its revolving credit line at June 30, 2015. The Agreement also includes $114.3 million in cash-secured letters of credit to satisfy collateral requirements associated with various surety deposit requirements for workers’ compensation purposes in the state of California. In conjunction with these letters of credit, the Company posted $114.3 million of certificates of deposit with the Bank as collateral, of which $26.0 million and $88.3 million is included in current assets and long-term assets, respectively, on the consolidated balance sheet at June 30, 2015 and $114.3 million was included in long-term assets on the consolidated balance sheet as of December 31, 2014.

The term loan with the Bank requires payments of $7.0 million on September 30, 2015, $15.0 million on December 31, 2015, $5.0 million on June 30, 2016 and $5.0 million on September 30, 2016, with the balance due at maturity. The term loan bears interest at the one month LIBOR plus 4.0%.

Advances under the revolving credit facility bear interest, as selected by the Company, of either (a) a daily floating rate of one month LIBOR plus 2.0% or (b) a fixed rate of LIBOR plus 2.0%. The Agreement also provides for an unused commitment fee of 0.35% per year on the average daily unused amount of the revolving credit facility, and a fee of 1.75% of the face amount of each letter of credit.

The credit facility is collateralized by the Company’s accounts receivable and other rights to receive payment, general intangibles, inventory and equipment.

The Agreement requires the satisfaction of certain financial covenants as follows:

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 3 – Revolving Credit Facility and Long-Term Debt (Continued)

The Agreement includes certain additional covenants as follows:

The Agreement also contains customary events of default. If an event of default under the Agreement occurs and is continuing, the Bank may declare any outstanding obligations under the Agreement to be immediately due and payable. The Company was in compliance with all applicable financial covenants at June 30, 2015.

Additionally, the Company maintains a term loan with the Bank with a balance of approximately $4.9 million and $5.1 million at June 30, 2015 and December 31, 2014, respectively, secured by the Company’s corporate office building in Vancouver, Washington. The term loan requires payment of monthly installments of $18,375, bearing interest at the one month LIBOR plus 2.25%, with the unpaid principal balance due November 1, 2017.

Note 4 - Basic and Diluted Earnings Per Share

Basic earnings per share are computed based on the weighted average number of common shares outstanding during the period using the treasury method. Diluted earnings per share reflect the potential effects of the exercise of outstanding stock options and vesting of restricted stock units. Basic and diluted shares outstanding are summarized as follows (in thousands):

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 5 - Workers’ Compensation

The following table summarizes the aggregate workers’ compensation reserve activity (in thousands):

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 6 - Fair Value Measurement

Marketable securities consist of the following investments (in thousands):

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 6 - Fair Value Measurement (Continued)

The Company’s restricted marketable securities component of restricted marketable securities and workers’ compensation deposits consists of the following (in thousands):

The Company’s restricted certificates of deposit are summarized as follows (in thousands):

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 7 – Income Taxes

Under ASC 740, “Income Taxes,” management evaluates the realizability of the deferred tax assets on a quarterly basis under a “more-likely than not” standard. As part of this evaluation, management reviews all evidence both positive and negative to determine if a valuation allowance is needed. One component of this analysis is to determine whether the Company was in a cumulative loss position for the most recent 12 quarters. The Company was in a cumulative income position for the 12 quarters ended June 30, 2015. Management’s review of positive evidence included the existence of federal and California taxable income in eligible carryback years, reversal of temporary items, and projection of future taxable income. Management concluded that no additional valuation allowance, other than those previously recorded against particular deferred tax assets, was required at June 30, 2015. Management will monitor the need for an additional valuation allowance at each quarter in the future and, if the negative evidence outweighs the positive evidence, an allowance will be recorded.

Note 8 – Litigation

On November 6, 2014, plaintiffs in Michael Arciaga, et al. v. Barrett Business Services, Inc., et al., filed an action in the United States District Court for the Western District of Washington against BBSI and Michael L. Elich and James D. Miller, BBSI’s Chief Executive Officer and Chief Financial Officer, respectively. The action purports to be a class action brought on behalf of all Company shareholders alleging violations of the federal securities laws. The claims arise from the decline in the market price for BBSI common stock following announcement of a charge for increased workers compensation reserves expense. The lawsuit seeks compensatory damages (in an amount to be determined at trial), plus interest, and costs and expenses (including attorney fees and expert fees).

On November 13, 2014, a second purported shareholder class action was filed in the United States District Court for the Western District of Washington, entitled Christopher P. Carnes, et al. v. Barrett Business Services, Inc., et al. The Carnes complaint names the same defendants as the Arciaga case and asserts similar claims for relief.

Similarly, on November 17, 2014, a third purported shareholder class action was filed in the United States District Court for the Western District of Washington, entitled Shiva Stein, et al. v. Barrett Business Services, Inc., et al. The Stein complaint names the same defendants as the Arciaga and Carnes cases and asserts similar claims for relief.

On February 25, 2015, the court ordered consolidation of the three cases, and any new or other cases involving the same subject matter, into a single action for pretrial purposes. The court also appointed the Painters & Allied Trades District Council No. 35 Pension and Annuity Funds as the lead plaintiff.

On April 29, 2015, the plaintiffs in the class action filed a consolidated amended complaint that asserts the same legal claims as the original lawsuits. On June 12, 2015, defendants filed a motion to dismiss the consolidated amended complaint. A hearing on the motion to dismiss the lawsuits is scheduled for early September 2015. Discovery has not been undertaken as it is automatically stayed under the federal Private Securities Litigation Reform Act.

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BARRETT BUSINESS SERVICES, INC.

Notes to Consolidated Financial Statements (Unaudited) (Continued)

Note 8 – Litigation (Continued)

BBSI received a subpoena from the San Francisco office of the Division of Enforcement of the Securities and Exchange Commission (the “SEC”) in May 2015 in connection with the SEC’s investigation of the Company’s accounting practices with regard to its workers’ compensation reserves. The Company believes that the SEC’s inquiry was precipitated by the litigation described above and is cooperating fully with the SEC staff in providing the requested information.

On June 17, 2015, Daniel Salinas (“Salinas”) filed a shareholder derivative lawsuit against BBSI and certain of its officers and directors in the Circuit Court for Baltimore City, Maryland. The complaint alleges breaches of fiduciary duty, unjust enrichment and other violations of law and seeks recovery of various damages, including the costs and expenses incurred in connection with the Company’s reserve strengthening process, reserve study and consultants, the cost of stock repurchases by BBSI in October 2014, compensation paid to the Company’s officers, and costs of negotiating the Company’s credit facility with its principal lender, as well as the proceeds of sales of stock by certain of BBSI’s officers and directors during 2013 and 2014. The derivative claim challenges substantially the same conduct as the shareholder class action lawsuits described above. The Company’s first appearance is due September 21, 2015. The derivative lawsuit follows a prior demand letter from counsel representing Salinas received by BBSI on February 27, 2015.

Management is unable to estimate the probability, or the potential range, of loss arising from these legal actions.

The Company is subject to other legal proceedings and claims, which arise in the ordinary course of our business. In the opinion of management, the amount of ultimate liability with respect to currently pending or threatened actions is not expected to materially affect the consolidated financial position or results of operations of the Company.

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Overview

Barrett Business Services, Inc. (“BBSI,” the “Company,” “our” or “we”), is a leading provider of business management solutions for small-and mid-sized companies. The Company has developed a management platform that integrates tools from the human resource outsourcing industry and a knowledge-based approach from the management consulting industry. This platform, through the effective leveraging of human capital, assists our business owner clients in more effectively running their business. We believe this platform, delivered through local teams of professionals, differentiates BBSI from our competitors. BBSI was incorporated in Maryland in 1965.

Business Strategy

Our strategy is to align local operations teams with the mission of small and mid-sized business owners, driving value to their business. To do so, BBSI:

Business Organization

We operate a decentralized delivery model using locally based teams, typically located within 50 miles of our client companies. We recruit senior level managers to oversee, develop and expand our business at the branch-office level. Additionally, we recruit professionals with expertise in human resources, risk management and workplace safety and various types of administration, including payroll, to field our client delivery teams. This structure fosters autonomous decision-making, allowing local teams of professionals to deliver plans that most closely align with the needs of each business owner client. It also assists us by incubating talent to support increased growth and capacity. We have clients with employees located in 22 states and the District of Columbia, through a network of 54 branch locations in California, Oregon, Washington, Idaho, Arizona, Nevada, Utah, Colorado, Maryland, Delaware and North Carolina. We also have several smaller recruiting locations in our general market areas, which are under the direction of a branch office.

BBSI believes that making significant investments in the best talent available allows us to leverage the value of this investment many times over. We motivate our management employees through a compensation package that includes a competitive base salary and the opportunity for profit sharing. At the branch level, profit sharing is in direct correlation to client performance, reinforcing a culture focused on achievement of client goals.

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Services Overview

BBSI’s core purpose is to advocate for business owners, particularly in the small-and mid-sized business segment. Our evolution from an entrepreneurially run company to a professionally managed organization has helped to form our view that all businesses experience inflection points at key stages of growth. The insights gained through our own growth, along with the trends we see in working with more than 3,000 companies each day, define our approach to guiding business owners through the challenges associated with being an employer.

BBSI’s business teams align with each business owner client through a structured three-tiered progression. In doing so, business teams focus on the objectives of each business owner and deliver planning, guidance and resources in support of those objectives.

Tier 1: Tactical Alignment

The first stage focuses on the mutual setting of expectations and is essential to a successful client relationship. It begins with a process of assessment and discovery in which the business owners’ business objectives, attitudes, and culture are aligned with BBSI’s processes, controls and culture. This stage includes an implementation process, which addresses the administrative components of employment.

Tier 2: Dynamic Relationship

The second stage of the relationship emphasizes organizational development as a means of achieving each client’s business objectives. There is a focus on process improvement, development of best practices, supervisor training and leadership development.

Tier 3: Strategic Counsel

With an emphasis on advocacy on behalf of the business owner, the third stage of the relationship is more strategic and forward-looking with a goal of cultivating an environment in which all efforts are directed by the mission and long-term objectives of the business owner.

In addition to serving as resource and guide, BBSI has the ability to provide workers’ compensation coverage as a means of meeting statutory requirements and protecting our clients from employment-related injury claims. Through our internal claims managers and our third-party administrators, we provide claims management services for our co-employed clients. We work aggressively to manage and reduce job injury claims, identify fraudulent claims and structure optimal work programs, including modified duty employees.

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Results of Operations

The following table sets forth percentages of total revenues represented by selected items in the Company’s Consolidated Statements of Operations for the three and six months ended June 30, 2015 and 2014.

We report professional employer services revenues on a net basis because we are not the primary obligor for the services provided by our co-employed clients to their customers pursuant to our client service agreements. The presentation of revenues on a net basis and the relative contributions of staffing and professional employer services revenues can create volatility in our gross margin percentage. The general impact of fluctuations in our revenue mix is described below.

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Results of Operations (Continued)

We present for comparison purposes the gross revenues and cost of revenues information set forth in the table below. Although not in accordance with GAAP, management believes this information is more informative as to the level of our business activity and more illustrative of how we manage our operations, including the preparation of our internal operating forecasts, because it presents our professional employer services on a basis comparable to our staffing services.

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Results of Operations (Continued)

A reconciliation of non-GAAP gross professional employer services revenues to net professional employer services revenues is as follows: