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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K Delaware ( State or other jurisdiction of incorporation or organization ) Securities Registered Pursuant to Section 12 ( b ) of the Act Common Stock , $ 0.01 par value TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from For the fiscal year ended December 31 , 2020 or Commission File Number 001-16441 CC to CROWN CASTLE INTERNATIONAL CORP . ( Exact name of registrant as specified in its charter ) 1220 Augusta Drive , Suite 600 , Houston , Texas 77057-2261 ( Address of principal executive offices ) ( Zip Code ) ( 713 ) 570-3000 ( Registrant's telephone number , including area code ) Trading Symbols CCI Securities Registered Pursuant to Section 12 ( g ) of the Act : NONE . 76-0470458 ( I.R.S. Employer Identification No. ) Name of Each Exchange on Which Registered New York Stock Exchange Yes No 冈 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 . 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 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 definitions of a " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . As of February 17 , 2021 , there were 431,311,859 shares of common stock outstanding . 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 Act ) . Yes No The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant was approximately $ 69.4 billion as of June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , based on the New York Stock Exchange closing price on that day of $ 167.35 per share . Applicable Only to Corporate Registrants Documents Incorporated by Reference The information required to be furnished pursuant to Part III of this Form 10 - K will be set forth in , and incorporated by reference from , the registrant's definitive proxy statement for the annual meeting of stockholders ( " 2021 Proxy Statement " ) , which will be filed with the Securities and Exchange Commission not later than 120 days after the end of the fiscal year ended December 31 , 2020 .