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( Mark One ) 冈 ☐ SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM Commission File Number 1-10427 to ROBERT HALF INTERNATIONAL INC . Delaware ( State or other jurisdiction of incorporation or organization ) 2884 Sand Hill Road Suite 200 Menlo Park , California ( Address of principal executive offices ) Title of each class ( Exact name of registrant as specified in its charter ) Registrant's telephone number , including area code : ( 650 ) 234-6000 Securities registered pursuant to Section 12 ( b ) of the Act Trading Symbol ( s ) 94-1648752 ( I.R.S. Employer Identification No. ) 94025 ( zip - code ) Common Stock , par value $ 0.001 per share RHI Name of each exchange on which registered New York Stock Exchange 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 Indicate by check mark whether the registrant has submitted electronically 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 for such shorter period that the registrant was required to submit and post such files ) . Yes ☑ No □ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a 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 . Large accelerated filer Accelerated filer Non - accelerated filer Smaller reporting company ☐ ☐ Emerging growth company ☐ ㅁ 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 is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes ☐ No ☑ Indicate the number of shares outstanding of each of the issuer's classes of common stock as of March 31 , 2021 : 112,780,592 shares of $ .001 par value Common Stock