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( Mark One ) ☐ 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 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 For the transition period from to to Title of each class Common Stock , $ 0.01 par value Commission file number 001-34626 Piedmont Office Realty Trust , Inc. ( Exact name of registrant as specified in its charter ) Maryland ( State or other jurisdiction of incorporation or organization ) 5565 Glenridge Connector Ste . 450 , Atlanta , Georgia ( Address of principal executive offices ) 58-2328421 ( I.R.S. Employer Identification Number ) 30342 ( Zip Code ) ( 770 ) 418-8800 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol PDM Securities registered pursuant to Section 12 ( g ) of the Act : ( Title of Class ) None Name of exchange on which registered New York Stock Exchange No No > 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 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 during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes No Accelerated filer Smaller reporting company П 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 ( as defined in Rule 12b - 2 of the Exchange Act ) . Large accelerated filer > Non - accelerated filer 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 As of June 30 , 2020 , the aggregate market value of the common stock of Piedmont Office Realty Trust , Inc. , held by non - affiliates was $ 2,077,362,736 based on the closing price as reported on the New York Stock Exchange . As of February 16 , 2021 , 123,955,273 shares of common stock were outstanding . Documents Incorporated by Reference : Registrant incorporates by reference portions of the Piedmont Office Realty Trust , Inc. Definitive Proxy Statement for the 2021 Annual Meeting of Stockholders ( Items 10 , 11 , 12 , 13 , and 14 of Part III ) to be filed no later than April 30 , 2021 .