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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31 , 2020 Arch ARCH CAPITAL GROUP LTD . ( Exact name of registrant as specified in its charter ) Bermuda ( State or other jurisdiction of incorporation or organization ) Waterloo House , Ground Floor 100 Pitts Bay Road , Pembroke HM 08 , Bermuda ( Address of principal executive offices ) Commission File No. 001-16209 Title of each class Common Shares , $ 0.0011 par value per share Depositary shares , each representing a 1 / 1,000th interest in a 5.25 % Series E preferred share Depositary shares , each representing a 1 / 1,000th interest in a 5.45 % Series F preferred share Securities registered pursuant to Section 12 ( b ) of the Exchange Act : Trading Symbol ( s ) ACGL ACGLP ACGLO 98-0374481 ( I.R.S. Employer Identification No. ) ( 441 ) 278-9250 ( Registrant's telephone number , including area code ) Name of each exchange on which registered NASDAQ NASDAQ NASDAQ Securities registered pursuant to Section 12 ( g ) of the Exchange 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 No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange Act . Yes □ No Stock Market Stock Market Stock Market Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Exchange Act 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 □ As of February 19 , 2021 , there were 403,014,515 of the registrant's common shares outstanding . DOCUMENTS INCORPORATED BY REFERENCE 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 , 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 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 The aggregate market value of the voting and non - voting common equity held by non - affiliates , computed by reference to the closing price as reported by the NASDAQ Stock Market as of the last business day of the Registrant's most recently completed second fiscal quarter , was approximately $ 11.3 billion .