AUTONATION, INC. (Exact Name of Registrant As Specified in Its Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 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: 1-13107 AUTONATION, INC. (Exact name of registrant as specified in its charter) Delaware 73-1105145 (State or other jurisdiction of (I.R.S. Employer Identification No.) incorporation or organization) 200 SW 1st Ave Fort Lauderdale, Florida 33301 (Address of principal executive offices) (Zip Code) (954) 769-6000 (Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Title of each class Name of each exchange on which registered Common Stock, Par Value $0.01 Per Share 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 þ No ¨ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act. Yes ¨ No þ 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 þ 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 new registrant was required to submit such files). Yes þ No ¨ Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ 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. (Check one): Large accelerated filer þ Accelerated filer o Non-accelerated filer o Smaller reporting company o Emerging growth company o 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 is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No þ As of June 29, 2018 , the aggregate market value of the common stock of the registrant held by non-affiliates was approximately $2.6 billion based on the closing price of the common stock on the New York Stock Exchange on such date (for the purpose of this calculation, the registrant assumed that each of its directors, executive officers, and greater than 10% stockholders was an affiliate of the registrant as of June 29, 2018 ). As of February 20, 2019 , the registrant had 90,058,836 shares of common stock outstanding. DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s Proxy Statement relating to its 2019 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year ended December 31, 2018 are incorporated herein by reference in Part III. AUTONATION, INC. FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2018 INDEX PART I Page Item 1. Business 1 Item 1A. Risk Factors 11 Item 1B. Unresolved Staff Comments 18 Item 2. Properties 18 Item 3. Legal Proceedings 18 Item 4. Mine Safety Disclosures 19 PART II Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 20 Item 6. Selected Financial Data 22 Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations 23 Item 7A. Quantitative and Qualitative Disclosures About Market Risk 50 Item 8. Financial Statements and Supplementary Data 52 Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 96 Item 9A. Controls and Procedures 96 Item 9B. Other Information 96 PART III Item 10. Directors, Executive Officers and Corporate Governance 97 Item 11. Executive Compensation 97 Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 97 Item 13. Certain Relationships and Related Transactions, and Director Independence 98 Item 14. Principal Accounting Fees and Services 98 PART IV Item 15. Exhibits, Financial Statement Schedules 99 Item 16. Form 10-K Summary 99 Table of Contents PART I ITEM 1. BUSINESS General AutoNation, Inc., through its subsidiaries, is the largest automotive retailer in the United States. As of December 31, 2018 , we owned and operated 326 new vehicle franchises from 239 stores located in the United States, predominantly in major metropolitan markets in the Sunbelt region. Our stores, which we believe include some of the most recognizable and well-known in our key markets, sell 33 different new vehicle brands. The core brands of new vehicles that we sell, representing approximately 92% of the new vehicles that we sold in 2018 , are manufactured by Toyota (including Lexus), Honda, Ford, General Motors, FCA US, Mercedes-Benz, Nissan, BMW, and Volkswagen (including Audi and Porsche) . We also own and operate 85 AutoNation-branded collision centers, and together with our vehicle dealerships, our AutoNation USA stores, and our automotive auctions, we owned and operated over 325 locations coast to coast. We offer a diversified range of automotive products and services, including new vehicles, used vehicles, “parts and service” (also referred to as “Customer Care”), which includes automotive repair and maintenance services as well as wholesale parts and collision businesses, and automotive “finance and insurance” products (also referred to as “Customer Financial Services”), which include vehicle service and other protection products, as well as the arranging of financing for vehicle purchases through third-party finance sources. The following charts present the contribution to total revenue and gross profit by each of new vehicle, used vehicle, parts and service, and finance and insurance sales in 2018 . We were incorporated in Delaware in 1991. For convenience, the terms “AutoNation,” “Company,” and “we” are used to refer collectively to AutoNation, Inc. and its subsidiaries, unless otherwise required by the context. Our store operations are conducted by our subsidiaries. Reportable Segments As of December 31, 2018 , we had three reportable segments: Domestic, Import, and Premium Luxury. These segments are comprised of retail automotive franchises that sell the following new vehicle brands: Domestic Import Premium Luxury Buick Ford Acura Mitsubishi Alfa Romeo Lexus Cadillac GMC Fiat Nissan Audi Maserati Chevrolet Jeep Honda Subaru Bentley Mercedes-Benz Chrysler Lincoln Hyundai Toyota BMW MINI Dodge Ram Infiniti Volkswagen Jaguar Porsche Mazda Volvo Land Rover 1 Table of Contents The franchises in each segment also sell used vehicles, parts and automotive repair and maintenance services, and automotive finance and insurance products. For the year ended December 31, 2018 , Domestic revenue represented 33% of total revenue, Premium Luxury revenue represented 33% of total revenue, and Import revenue represented 32% of total revenue. For additional financial information regarding our three reportable segments, refer to Note 20 of the Notes to Consolidated Financial Statements set forth in Part II, Item 8 of this Form 10-K. Except to the extent that differences among reportable segments are material to an understanding of our business taken as a whole, the description of our business in this report is presented on a consolidated basis. Business Strategy We seek to create long-term value for our stockholders by being the best-run, most profitable automotive retailer in the United States. We believe that the significant scale of our operations and the quality of our managerial talent allow us to achieve efficiencies in our key markets. To achieve and sustain operational excellence, we are pursuing the following strategies: • Create an industry-leading automotive retail customer experience in our stores and through our digital channels . We seek to deliver a consistently superior customer experience by offering a large selection of inventory, customer-friendly, transparent sales and service processes, and competitive pricing. We believe that this will benefit us by encouraging our customers to bring their vehicles to our stores for all of their vehicle service, maintenance, and collision repair needs and also by driving repeat and referral vehicle sales business. We continue to make significant investments to build a seamless, end-to-end customer experience in our stores and through our digital channels, and to improve our ability

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