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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( Mark One ) 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 0 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ΤΟ Commission File Number 001-39409 ALLOVIR , INC . ( Exact name of Registrant as specified in its Charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 139 Main Street , Suite 500 Cambridge , MA ( Address of principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Registrant's telephone number , including area code : ( 617 ) 433-2605 Title of each class Common Stock , par value $ 0.0001 per share 83-1971007 ( I.R.S. Employer Identification No. ) Trading Symbol ( s ) ALVR 02142 ( Zip Code ) Name of each exchange on which registered The Nasdaq Global Market 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 □ NO > Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Act . YES NO > 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 ( §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 , 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 As of June 30 , 2020 , the last day of the Registrant's most recently completed second fiscal quarter , there was no public market for the Registrant's common stock . The Registrant's common stock began trading on The Nasdaq Global Market on July 30 , 2020. The aggregate market value of the voting and non - voting common equity held by non - affiliates of the Registrant , based on the closing price of the shares of common stock on The Nasdaq Global Market on February 2 , 2021 , was $ 1,286,188,221.08 . In determining the market value of non - affiliate common stock , shares of the Registrant's common stock beneficially owned by officers , directors and affiliates have been excluded . This determination of affiliate status is not necessarily a conclusive determination for other purposes . The number of shares of Registrant's Common Stock , par value $ 0.0001 per share , outstanding as of February 2 , 2021 was 65,106,873 . DOCUMENTS INCORPORATED BY REFERENCE Portions of the Proxy Statement for the registrant's 2021 Annual Meeting of Stockholders , or the Proxy Statement , which the Registrant intends to file pursuant to Regulation 14A with the Securities and Exchange Commission not later than 120 days after the Registrant's fiscal year end of December 31 , 2020 , are incorporated by reference into Part III of this Annual Report on Form 10 - K .