Page 1

Table of Contents ( Mark One ) X 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 Name of Registrant , State of Incorporation , Address Of Principal Executive Offices , Telephone Number , Commission File No. , IRS Employer Identification No. PNM Resources , Inc. ( A New Mexico Corporation ) 414 Silver Ave. SW PNMR PNM TNMP Albuquerque , New Mexico 87102-3289 Telephone Number - ( 505 ) 241-2700 Commission File No. - 001-32462 IRS Employer Identification No. - 85-0468296 Public Service Company of New Mexico ( A New Mexico Corporation ) 414 Silver Ave. SW Albuquerque , New Mexico 87102-3289 Telephone Number - ( 505 ) 241-2700 Commission File No. - 001-06986 IRS Employer Identification No. - 85-0019030 Texas - New Mexico Power Company ( A Texas Corporation ) 577 N. Garden Right Blvd. Lewisville , Texas 75067 Securities registered pursuant to Section 12 ( b ) of the Act : Registrant PNM Resources , Inc. Securities registered pursuant to Section 12 ( g ) of the Act : Telephone Number - ( 972 ) 420-4189 Commission File No. - 002-97230 IRS Employer Identification No. - 75-0204070 Title of each class Common Stock , no par value Trading Symbol ( s ) . PNM Registrant Public Service Company of New Mexico Title of each class 1965 Series , 4.58 % Cumulative Preferred Stock ( $ 100 stated value without sinking fund ) Indicate by check mark whether each registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . PNM Resources , Inc. ( " PNMR " ) Public Service Company of New Mexico ( " PNM " ) Texas - New Mexico Power Company ( " TNMP " ) Name of each exchange on which registered New York Stock Exchange Yes Yes Yes Indicate by check mark if each registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . | 0 | 0 | 0 Yes Yes Yes 미 미미 No No 7 No ✔ No No ✔ No