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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , DC 20549 FORM 10 - K □ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 ( the " Act " ) For the fiscal year ended December 31 , 2020 □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-35636 Delaware ( State of Incorporation ) Title of each class Common Stock Large accelerated filer Non - accelerated filer ASGN Incorporated ( Exact name of registrant as specified in its charter ) 4400 Cox Road , Suite 110 Glen Allen , Virginia 23060 ( Address , including zip code , of Principal Executive Offices ) ( I.R.S. Employer Identification No. ) ( 888 ) 482-8068 ( Registrant's telephone number , including area code ) : Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ASGN 95-4023433 Name of each exchange on which registered NYSE Securities registered pursuant to Section 12 ( g ) of the Act : None ( Title of Class ) Yes No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act of 1933 . 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 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 of the past 90 days . Yes No 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 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 . Accelerated filer Smaller reporting company Emerging growth company ooo 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 Exchange Act ) . Yes No As of June 30 , 2020 , the aggregate market value of our common stock ( based upon the closing price of the stock on the New York Stock Exchange ) held by non - affiliates of the registrant was $ 3.4 billion . As of February 19 , 2021 , the registrant had 53.0 million outstanding shares of Common Stock , $ 0.01 par value . DOCUMENTS INCORPORATED BY REFERENCE We are incorporating by reference into Part III of this Annual Report on Form 10 - K portions of the registrant's definitive proxy statement for the 2021 Annual Meeting of Stockholders , to be filed within 120 days of the close of the registrant's fiscal year 2020 .