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ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K For the fiscal year ended December 31 , 2020 Commission File Number 0-21886 BARRETT BUSINESS SERVICES , INC . ( Exact name of registrant as specified in its charter ) Maryland ( State or other jurisdiction of incorporation or organization ) Title of each class Common Stock , Par Value $ 0.01 Per Share 8100 NE Parkway Drive , Suite 200 Vancouver , Washington ( Address of principal executive offices ) Large accelerated filer Emerging growth company ( 360 ) 828-0700 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) BBSI 52-0812977 ( IRS Employer Identification No. ) Securities registered pursuant to Section 12 ( g ) of the Act : None No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No 98662 ( Zip 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 > No Name of each exchange on which registered The NASDAQ Stock Market LLC Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes > No Accelerated filer > Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Non - accelerated filer Class Common Stock , Par Value $ .01 Per Share Smaller reporting company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No > State the aggregate market value of the common equity held by non - affiliates of the registrant : $ 397,266,232 at June 30 , 2020 Indicate the number of shares outstanding of each of the registrant's classes of common stock , as of the latest practicable date : Outstanding at February 16 , 2021 7,593,383 Shares DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive Proxy Statement for the 2021 Annual Meeting of Stockholders are hereby incorporated by reference in Part III of Form 10 K.