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Table of Contents 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 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 Commission File Number 001-37372 Collegium Pharmaceutical , Inc. ( Exact name of registrant as specified in its charter ) Virginia ( State or other jurisdiction of incorporation or organization ) 100 Technology Center Drive Stoughton , MA ( Address of principal executive offices ) Collegium PHARMACEUTICAL Large accelerated filer Title of each class Common stock , par value $ 0.001 per share ( 781 ) 713-3699 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) COLL 03-0416362 ( I.R.S. Employer Identification Number ) 02072 ( Zip Code ) Accelerated filer X Name of exchange on which registered : The NASDAQ Global Select 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 Section 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 , 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 . Non - accelerated filer ( Do not check if smaller reporting company ) 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 checkmark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No As of June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , the aggregate market value of the registrant's common stock held by non - affiliates of the registrant was approximately $ 598.6 million , based on the closing price of the registrant's common stock on The NASDAQ Global Select Market on June 30 , 2020 of $ 17.50 per share . Shares of the registrant's common stock held by each officer and director and each person known to the registrant to own 10 % or more of the outstanding common stock of the registrant have been excluded in that such persons may be deemed affiliates . This determination of affiliate status is not a determination for other purposes . As of January 31 , 2021 , there were 34,756,311 shares of the registrant's common stock , par value , $ 0.001 per share , outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's definitive proxy statement for its 2021 Annual Meeting of Shareholders ( the " Proxy Statement " ) , to be filed within 120 days of the registrant's year ended December 31 , 2020 , are incorporated by reference in Part II and Part III of this Report on Form 10 - K . Except with respect to information specifically incorporated by reference in this Form 10 - K , the Proxy Statement is not deemed to be filed as part of this Form 10 - K .