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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 For the fiscal year ended March 31 , 2021 OR □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number : 1-33026 COMMVAULTⓇ Delaware ( State or other jurisdiction of incorporation or organization ) Title of each class Common Stock , $ 0.01 par value Commvault Systems , Inc. ( Exact name of registrant as specified in its charter ) Large accelerated filer Emerging growth company ( I.R.S. Employer Identification No. ) 1 Commvault Way Tinton Falls , New Jersey 07724 ( Address of principal executive offices , including zip code ) ( 732 ) 870-4000 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) 22-3447504 Name of each exchange on which registered The NASDAQ Stock Market CVLT Securities registered pursuant to Section 12 ( g ) of the Act : None No No p Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes p 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 the 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 þ No .. Accelerated filer 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 registrant was required to submit such files . ) Yes p 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 definition of " large accelerated filer , " " accelerated filer , " " smaller reporting company " and " emerging growth company " in rule 12b - 2 of the Exchange Act . р Smaller reporting company Non - accelerated filer 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 o 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 . □ No p Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes As of September 30 , 2020 , the last business day of the Registrant's most recently completed second fiscal quarter ; the aggregate market value of voting and non - voting common stock held by non - affiliates of the registrant ( based upon the closing price of the common stock as reported by The NASDAQ Stock Market ) was approximately $ 1.9 billion . As of May 10 , 2021 , there were 46,026,243 shares of the registrant's common stock ( $ 0.01 par value ) outstanding . DOCUMENTS INCORPORATED BY REFERENCE Information required by Part III ( Items 10 , 11 , 12 , 13 and 14 ) is incorporated by reference to portions of the registrant's definitive Proxy Statement for its 2021 Annual Meeting of Stockholders ( the " Proxy Statement " ) , which is expected to be filed not later than 120 days after the registrant's fiscal year ended March 31 , 2021. Except as expressly incorporated by reference , the Proxy Statement shall not be deemed to be part of this report on Form 10 - K .