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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 fiscal year ended December 31 , 2020 □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 100 Nagog Park For the transition period from Delaware ( State or Other Jurisdiction of Incorporation or Organization ) Acton ( Address of Principal Executive Offices ) Commission File Number 001-33462 INSULET CORPORATION ( Exact name of Registrant as specified in its charter ) to Massachusetts Large accelerated filer x Accelerated filer 04-3523891 ( I.R.S. Employer Identification No. ) 01720 ( Zip Code ) Registrant's telephone number , including area code : ( 978 ) 600-7000 Securities registered pursuant to Section 12 ( b ) of the Act : Title of Each Class PODD Common Stock , $ 0.001 Par Value Per Share 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 x 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 x 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 x No " Trading Symbol ( s ) Name of Each Exchange on Which Registered The NASDAQ Stock Market , LLC * 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 and post such files ) . Yes x No " Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , or a smaller reporting 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 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 . DOCUMENTS INCORPORATED BY REFERENCE The registrant intends to file a proxy statement pursuant to Regulation 14A within 120 days the end of t fiscal year Portions of such proxy statement are incorporated by reference into Part III of this Annual Report on Form 10 - K . No 区 Indicate by check mark whether the Registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes The aggregate market value of the common stock held by non - affiliates of the registrant computed by reference to the last reported sale price of the Common Stock as reported on The NASDAQ Global Market on June 30 , 2020 was approximately $ 12.7 billion . The number of shares of common stock outstanding as of February 18 , 2021 was 66,080,324 . ended Dec er 31 , 2020 .