EXHIBIT 99.1

BBSI Reports Third Quarter 2026 Financial Results

- Revenues up 5% to $334.1 Million and Gross Billings up 3% to $2.40 Billion -

VANCOUVER, Washington, November 4, 2026 – Barrett Business Services, Inc. (“BBSI” or the “Company”) (NASDAQ: BBSI), a leading provider of business management solutions, reported financial results for the third quarter ended September 30, 2026.

Third Quarter 2026 Financial Summary vs. Year-Ago Quarter

“BBSI delivered third quarter results in line with our expectations, reflecting continued execution against our controllable growth initiatives and disciplined operational management,” said Gary Kramer, President and CEO of BBSI. “Although client hiring trends remain soft, we are encouraged by improving conditions in the workers’ compensation market and our continued ability to secure rate increases. Combined with consistent execution across our controllable growth initiatives, these trends position us to build on our operating foundation as we move into 2027. We remain focused on disciplined growth, delivering value to our clients and strengthening our platform for long-term success.”

Third Quarter 2026 Financial Results

Revenues in the third quarter of 2026 increased 5% to $334.1 million compared to $318.9 million in the third quarter of 2025.

Total gross billings in the third quarter of 2026 increased 3% to $2.40 billion compared to $2.32 billion in the same year-ago quarter (see “Key Performance Metrics” below). The increase was driven by growth in professional employer (“PEO”) services, primarily resulting from increased WSEs from net new clients, as well as higher average billings per WSE per day.

Workers’ compensation expense as a percent of gross billings was 2.4% in the third quarter of 2026, which included favorable prior year liability and premium adjustments of $0.8 million. This compares to 2.2% in the third quarter of 2025, which included favorable prior year liability and premium adjustments of $3.9 million.

Net income for the third quarter of 2026 was $16.8 million, or $0.69 per diluted share, compared to net income of $20.6 million, or $0.79 per diluted share, in the year-ago quarter.

Liquidity

As of September 30, 2026, unrestricted cash and investments were $73.7 million compared to $67.9 million as of June 30, 2026. BBSI remained debt free at quarter end.

Capital Allocation

Continuing under the Company’s stock repurchase program established in August 2025, BBSI repurchased $9.0 million of common stock in the third quarter, comprising 273,695 shares at an average price of $33.01. At September 30, 2026, approximately $31.2 million remained available under the $100 million repurchase program.

The Company paid $1.9 million of dividends in the quarter, and BBSI’s board of directors confirmed its next regular quarterly cash dividend at $0.08 per share. The cash dividend will be paid on December 4, 2026, to all stockholders of record as of November 20, 2026.

Through a combination of stock repurchases and dividends, year-to-date capital returned to shareholders totaled more than $50 million.

Outlook

The calendar-year outlook for 2026 is as follows:

Conference Call

BBSI will conduct a conference call on Wednesday, November 4, 2026, at 5:00 p.m. Eastern time (2:00 p.m. Pacific time) to discuss its financial results for the third quarter ended September 30, 2026.

BBSI’s CEO Gary Kramer and CFO Anthony Harris will host the conference call, followed by a question and answer period.

Date: Wednesday, November 4, 2026
Time: 5:00 p.m. Eastern time (2:00 p.m. Pacific time)
Toll-free dial-in number: 1-800-717-1738
International dial-in number: 1-646-307-1865
Conference ID: 1199707

Please call the conference telephone number 5-10 minutes prior to the start time. An operator will register your name and organization. If you have any difficulty connecting with the conference call, please contact Gateway Group at 1-949-574-3860.

The conference call will be broadcast live and available for replay here and via the Investors section of the BBSI website at ir.bbsi.com.

A replay of the conference call will be available after 8:00 p.m. Eastern time on the same day through December 4, 2026.

Toll-free replay number: 1-844-512-2921
International replay number: 1-412-317-6671
Replay ID: 1199707

Key Performance Metrics and Non-GAAP Financial Measures

During the first quarter of 2026, the Company recorded tax-effected charges of $11.6 million related to the disallowance of certain wage-based tax credits claimed in prior years. This charge was recorded within provision for income taxes on our condensed consolidated statements of operations. We have excluded this charge from our non-GAAP measures as it relates to prior periods and is not indicative of our current or future operational performance.

The reconciliation of net income and diluted income per share to non-GAAP net income and non-GAAP diluted income per share for the nine months ended September 30, 2026 is shown in the table below (in thousands, except per share amounts):

We report PEO revenues net of direct payroll costs because we are not the primary obligor for wage payments to our clients’ employees. However, management believes that gross billings and wages are useful in understanding the volume of our business activity and serve as important performance metrics in managing our operations, including the preparation of internal operating forecasts and establishing executive compensation performance goals. We therefore present for purposes of analysis gross billings and wage information for the three and nine months ended September 30, 2026 and 2025.

In monitoring and evaluating the performance of our operations, management also reviews the following ratios, which represent selected amounts as a percentage of gross billings. Management believes these ratios are useful in understanding the efficiency and profitability of our service offerings.

We refer to employees of our PEO clients as WSEs. Management reviews average and ending WSE growth to monitor and evaluate the performance of our operations. Average WSEs are calculated by dividing the number of unique individuals paid in each month by the number of months in the period. Ending WSEs represents the number of unique individuals paid in the last month of the period.

About BBSI

BBSI (NASDAQ: BBSI) is a leading provider of business management solutions, combining human resource outsourcing and professional management consulting to create a unique operational platform that differentiates it from competitors. The Company’s integrated platform is built upon expertise in payroll processing, employee benefits, workers’ compensation coverage, risk management and workplace safety programs, and human resource administration. BBSI’s partnerships help businesses of all sizes improve the efficiency of their operations. The Company works with more than 8,200 PEO clients in all 50 states. For more information, please visit www.bbsi.com.

Forward-Looking Statements

Statements in this release about future events and financial outlook are forward-looking statements. Such statements involve known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Factors that could affect future results include: our ability to retain current clients and attract new clients; technology implementation and disruption, including the displacement of employees through the adoption of AI and automation by our clients; the outcome of audits and other determinations by the IRS; difficulties associated with integrating clients into our operations; economic trends in the Company’s service areas and the potential effects of changing governmental policies, including those related to immigration, tariffs, other trade policies, or climate regulation; risks to our business and the business of our clients arising from current or future tariffs or other trade restrictions, supply chain issues, changes in labor force, or geopolitical instability, including the wars in Ukraine and Iran, other conflicts in the Middle East, and the potential for future conflicts or disruptions in other parts of the world; natural disasters; the potential for material deviations from expected future workers’ compensation claims experience; changes in the workers’ compensation regulatory environment in the Company’s primary markets; PEO client benefit costs, particularly with regard to health insurance benefits; security breaches or failures in the Company’s information technology systems; collectability of accounts receivable; changes in executive management; changes in effective payroll tax rates and federal and state income tax rates; the carrying values of deferred income tax assets and goodwill (which may be affected by our future operating results); the effects of inflation on our operating expenses and those of our clients; the impact of and potential changes to the Patient Protection and Affordable Care Act, escalating medical costs, and other health care legislative initiatives on our business; the impact of the One Big Beautiful Bill Act and other recently enacted legislation on our business; the effect of changing monetary policy, interest rates and conditions in the global capital markets on the Company’s investment portfolio; and the availability of capital, borrowing capacity on our revolving credit facility, or letters of credit necessary to meet state-mandated surety deposit requirements for maintaining our status as a qualified self-insured employer for workers’ compensation coverage or our insured program. Other important factors that may affect the Company’s prospects are described in the Company’s 2025 Annual Report on Form 10-K and in subsequent reports filed with the Securities and Exchange Commission under the Securities Exchange Act of 1934. Although forward-looking statements help to provide complete information about the Company, readers should keep in mind that forward-looking statements are less reliable than historical information. The Company undertakes no obligation to update or revise forward-looking statements in this release to reflect events or changes in circumstances that occur after the date of this release.

Barrett Business Services, Inc.

Condensed Consolidated Balance Sheets

(Unaudited)

Barrett Business Services, Inc.

Consolidated Statements of Operations

(Unaudited)

Investor Relations:

Gateway Group, Inc.

Cody Slach

Tel 1-949-574-3860

BBSI@gateway-grp.com