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( Mark One ) 1934 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF For the fiscal year ended December 31 , 2020 OR TRANSITION 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 Title of each class Common stock , par value $ 0.001 per share 4.800 % Notes due 2026 5.125 % Notes due 2031 For the transition period from Commission File Number 001-38979 Boston , ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) BrightSphere Investment Group Inc. 200 Clarendon Street , 53rd Floor Massachusetts ( Address of principal executive offices ) Ticker Symbol BSIG BSIG 26 BSA to ( 617 ) -369-7300 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : 47-1121020 ( I.R.S. Employer Identification No. ) 02116 ( Zip Code ) Accelerated filer Name of each exchange on which registered New York Stock Exchange New York Stock Exchange New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None . 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 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 No 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 if disclosure of delinquent filers pursuant to Item 405 of Regulation S - K ( 229.405 of this chapter ) is not contained herein , and will not be contained , to the best of registrant's knowledge , in definitive proxy or information statements incorporated by reference in Part III of this Form 10 - K or any amendment to this Form 10 - K . 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 . ( Check one ) : Large accelerated filer Non - accelerated filer Smaller reporting company | Emerging growth 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 At June 30 , 2020 , the aggregate market value of the shares of common stock held by non - affiliates of the registrant , based upon the closing price of $ 12.46 on that date on the New York Stock Exchange , was $ 653,651,438 . Calculation of holdings by non - affiliates is based upon the assumption , for this purpose only , that executive officers , directors and any persons holding 10 % or more of the registrant's shares of common stock are affiliates . There were 79,399,859 shares of the registrant's shares of common stock outstanding on February 25 , 2021 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive Proxy Statement to be delivered to shareholders in connection with the Annual Meeting of Shareholders to be held on or about June 23 , 2021 are incorporated by reference into Part III .