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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 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 No. 1-9328 Delaware ( State or other jurisdiction of incorporation or organization ) ECOLAB INC . ( Exact name of registrant as specified in its charter ) 1 Ecolab Place , St. Paul , Minnesota 55102 ( Address of principal executive offices ) ( Zip Code ) Registrant's telephone number , including area code : 1-800-232-6522 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , $ 1.00 par value 2.625 % Euro Notes due 2025 1.000 % Euro Notes due 2024 Trading symbol ( s ) ECL ECL 25 ECL 24 Large accelerated filer > Non - accelerated filer 41-0231510 ( I.R.S. Employer Identification No. ) Name of each exchange on which registered New York Stock Exchange New York Stock Exchange New York Stock Exchange 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 , 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 . 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 Aggregate market value of voting and non - voting common equity held by non - affiliates of registrant on June 30 , 2020 , the last business day of the Registrant's most recently completed second fiscal quarter : $ 56,528,667,907 ( see Item 12 , under Part III hereof ) , based on a closing price of registrant's Common Stock of $ 198.95 per share . The number of shares of registrant's Common Stock , par value $ 1.00 per share , outstanding as of January 29 , 2021 : 285,849,956 shares . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's Proxy Statement for the Annual Meeting of Stockholders to be held May 6 , 2021 , and to be filed within 120 days after the registrant's fiscal year ended December 31 , 2020 ( hereinafter referred to as " Proxy Statement " ) , are incorporated by reference into Part III .