Page 1

Table of Contents ( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 1934 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF FORM 10 - K Delaware ( State or Other Jurisdiction of Incorporation or Organization ) Title of Each Class Common Stock , $ 0.01 Par Value For the transition period from Large Accelerated Filer Non - Accelerated Filer to Commission file number : 001-32598 Entegris Entegris , Inc. ( Exact name of registrant as specified in its charter ) 41-1941551 ( I.R.S. Employer Identification No. ) 129 Concord Road , Billerica , Massachusetts 01821 ( Address of principal executive offices and zip code ) ( 978 ) 436-6500 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) ENTG Securities registered pursuant to Section 12 ( g ) of the Act : None Name of Exchange on which Registered The Nasdaq Global Select Market X Yes - No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . 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 . Accelerated Filer Smaller reporting company Emerging growth company