EXHIBIT 99.1

BBSI Reports Third Quarter 2025 Financial Results

- Revenues up 8% to $318.9 Million and Gross Billings up 9% to $2.32 Billion -

VANCOUVER, Washington, November 5, 2025 – 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, 2025.

Third Quarter 2025 Financial Summary vs. Year-Ago Quarter

“BBSI delivered another strong quarter of controllable growth driven by new client additions,” said Gary Kramer, President and CEO of BBSI. “We continue to execute well against our strategy, leveraging our growth to drive sustained earnings expansion. Despite a more cautious economic environment, our continued ability to win new business and expand market share speaks to the strength of our differentiated model and the value we deliver to small and mid-sized businesses across the country. We remain focused on disciplined execution and investment in our people, technology, and service delivery to support long-term, sustainable growth.”

Third Quarter 2025 Financial Results

Revenues in the third quarter of 2025 increased 8% to $318.9 million compared to $294.3 million in the third quarter of 2024.

Total gross billings in the third quarter of 2025 increased 9% to $2.32 billion compared to $2.14 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 2.2% in the third quarter of 2025 and benefited from lower workers’ compensation costs, including favorable prior year liability and premium adjustments of $3.9 million. This compares to 2.3% in the third quarter of 2024, which included favorable prior year liability and premium adjustments of $4.3 million.

Net income for the third quarter of 2025 increased to $20.6 million, or $0.79 per diluted share, compared to net income of $19.6 million, or $0.74 per diluted share, in the year-ago quarter.

Liquidity

As of September 30, 2025, unrestricted cash and investments were $109.8 million compared to $90.4 million as of June 30, 2025. BBSI remained debt free at quarter end.

Capital Allocation

On August 4, 2025, BBSI’s board of directors authorized the repurchase of up to $100 million of the Company’s common stock over a two-year period beginning August 4th (the “Repurchase Program”). The Repurchase Program replaces the repurchase program approved in July 2023.

Under the Repurchase Program, BBSI repurchased $7.5 million of stock in the third quarter, comprising 159,570 shares at an average price of $47.19. At September 30, 2025, approximately $92.5 million remained available under the Repurchase Program.

The Company paid $2.1 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 5, 2025, to all stockholders of record as of November 21, 2025.

Through a combination of stock repurchases and dividends, year-to-date capital returned to shareholders totaled approximately $31 million.

Outlook

BBSI expects the following for 2025:

Conference Call

BBSI will conduct a conference call on Wednesday, November 5, 2025, 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, 2025.

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

Date: Wednesday, November 5, 2025
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: 10829

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 5, 2025.

Toll-free replay number: 1-844-512-2921
International replay number: 1-412-317-6671
Replay ID: 1110829

Key Performance Metrics

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, 2025 and 2024.

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 8,100 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 of the Company to be materially different from any future results expressed or implied by such forward-looking statements. Factors that could affect future results include: economic conditions in the Company’s service areas and the potential effects of changing governmental policies, including those related to immigration and tariffs; natural disasters; the effects of inflation on our operating expenses and those of our clients; the availability of certain fully insured medical and other health and welfare benefits to qualifying worksite employees; the effect of changes in the Company’s mix of services on gross margin; the Company’s ability to attract and retain clients and to achieve revenue growth; the availability of financing or other sources of capital; the Company’s relationship with its primary bank lender; 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 benefits costs, particularly with regard to health insurance benefits; litigation costs; security breaches or failures in the Company’s information technology systems; the collectability of accounts receivable; changes in executive management; changes in effective payroll tax rates and federal and state income tax rates; the carrying value of deferred income tax assets and goodwill; the outcome of tax audits; the effect of changing interest rates and conditions in the global capital markets on the Company’s investment portfolio; and the potential for and effect of acquisitions, among others. Other important factors that may affect the Company’s prospects are described in the Company’s 2024 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