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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

OR

Commission file number 001-38142

7102 Commerce Way, Brentwood, Tennessee 37027

(Address of principal executive offices) (Zip Code)

(615) 771-6701

(Registrant’s telephone number, including area code )

Securities registered pursuant to Section 12(b) of the Act:

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 o

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   o 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   o

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 (Section 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   þ     No  o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (section 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 amendments of this Form 10-K. o

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.:

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. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes  o   No þ

The aggregate market value of the common stock held by non-affiliates as of June 30, 2018 was approximately $4,173,499,366 , based upon the closing sale price of the registrant's common stock on the New York Stock Exchange on that date. For purposes of this calculation only, all directors, officers subject to Section 16(b) of the Securities Exchange Act of 1934, and 10% stockholders are deemed to be affiliates.

At February 22, 2019 , there were 78,006,537 shares of the registrant's common stock, $.01 par value, outstanding (excluding securities held by, or for the account of, the Company or its subsidiaries).

Documents incorporated by reference

Portions of the registrant's definitive Proxy Statement to be delivered to stockholders in connection with the 2019 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2018 , are incorporated by reference into Part III of this Form 10-K.

Delek US Holdings, Inc.

Annual Report on Form 10-K

For the Annual Period Ending December 31, 2018

Delek US Holdings, Inc. is a registrant pursuant to the Securities Act of 1933 and is listed under NYSE:DK. Effective July 1, 2017 (the "Effective Time"), we acquired the outstanding common stock of Alon (previously listed under NYSE: ALJ) (the "Delek/Alon Merger", as further discussed in Note 3 of the consolidated financial statements included in Item 8, Financial Statements and Supplementary Data, of this Annual Report on Form 10-K ), resulting in a new post-combination consolidated registrant renamed as Delek US Holdings, Inc. (“New Delek”), with Alon and the previous Delek US Holdings, Inc. (“Old Delek”) surviving as wholly-owned subsidiaries. New Delek is the successor issuer to Old Delek and Alon pursuant to Rule 12g-3(c) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). In addition, as a result of the Delek/Alon Merger, the shares of common stock of Old Delek and Alon were delisted from the New York Stock Exchange in July 2017, and their respective reporting obligations under the Exchange Act were terminated.

Unless otherwise noted or the context requires otherwise, the disclosures and financial information included in this report for the periods prior to July 1, 2017 reflect that of Old Delek, and the disclosures and financial information included in this report for the periods beginning July 1, 2017 reflect that of New Delek. The terms "we," "our," "us," "Delek" and the "Company" are used in this report to refer to Old Delek and its consolidated subsidiaries for the periods prior to July 1, 2017, and New Delek and its consolidated subsidiaries for the periods on or after July 1, 2017, unless otherwise noted. Our business consists of three operating segments: refining, logistics and retail.

As of December 31, 2018 , we owned a 61.4% limited partner interest in Delek Logistics Partners, LP ("Delek Logistics"), a publicly-traded master limited partnership that we formed in April 2012, and a 94.6% interest in Delek Logistics GP, LLC ("Logistics GP"), which owns the entire 2.0% general partner interest in Delek Logistics. By virtue of the Delek/Alon Merger, we acquired an 81.6% limited partner interest in Alon USA Partners, LP (the "Alon Partnership"), a publicly-traded limited partnership as well as 100% interest in Alon USA Partners GP, LLC (the “Alon General Partner”). Alon General Partner owns 100% of the general partner interest in the Alon Partnership, which is a non-economic interest. On February 7, 2018, we acquired the remaining outstanding units in the Alon Partnership whereby the owners of those units received a fixed exchange ratio of 0.49 shares of Delek Common Stock for each limited partner unit of the Alon Partnership, resulting in the issuance of approximately 5.6 million shares to the public unitholders of the Alon Partnership.

Statements in this Annual Report on Form 10-K, other than purely historical information, including statements regarding our plans, strategies, objectives, beliefs, expectations and intentions are forward-looking statements. These forward-looking statements generally are identified by the words "may," "will," "should," "could," "would," "predicts," "intends," "believes," "expects," "plans," "scheduled," "goal," "anticipates," "estimates" and similar expressions. Forward-looking statements are based on current expectations and assumptions that are subject to risks and uncertainties, including those discussed below and in Item 1A, Risk Factors, which may cause actual results to differ materially from the forward-looking statements. See also "Forward-Looking Statements" included in Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, of this Annual Report on Form 10-K.

See the “Glossary of Terms” beginning on page 4 of this Annual Report on Form 10-K for definitions of certain business and industry terms used herein.

Available Information

Our Internet website address is www.DelekUS.com. Information contained on our website is not part of this Annual Report on Form 10-K. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and any amendments to such reports filed with or furnished to the Securities and Exchange Commission (“SEC”) are available on our Internet website in the “Investor Relations” section, free of charge, as soon as reasonably practicable after we file or furnish such material to the SEC. We also post our Governance Guidelines, Code of Business Conduct & Ethics and the charters of our Board of Directors’ committees in the “Corporate Governance” section of our website, accessible by navigating to the “About Us” section on our Internet website. Our governance documents are available in print to any stockholder that makes a written request to the Secretary, Delek US Holdings, Inc., 7102 Commerce Way, Brentwood, Tennessee 37027. Our reports, proxy and information statements, and other information regarding issuers are filed electronically with the SEC, and may be accessed at http://www.sec.gov.

Glossary of Terms

The following are definitions of certain industry terms used in this Annual Report on Form 10-K:

Alkylation Unit - A refinery unit utilizing an acid catalyst to combine smaller hydrocarbon molecules to form larger molecules in the gasoline boiling range to produce a high octane gasoline blendstock, which is referred to as alkylate.

Barrel - A unit of volumetric measurement equivalent to 42 U.S. gallons.

Biodiesel - A renewable fuel produced from vegetable oils or animal fats that can be blended with petroleum-derived diesel to produce biodiesel blends for use in diesel engines. Pure biodiesel is referred to as B100, whereas blends of biodiesel are referenced by how much biodiesel is in the blend (e.g., a B5 blend contains five volume percent biodiesel and 95 volume percent ULSD).

Blendstocks - Various products or intermediate streams that are combined with other components of similar type and distillation range to produce finished gasoline, diesel fuel or other refined products. Blendstocks may include natural gasoline, hydrotreated Fluid Catalytic Cracking Unit gasoline, alkylate, ethanol, reformate, butane, diesel, biodiesel, kerosene, light cycle oil or slurry, among others.

Bpd/bpd - Barrels per calendar day.

Brent Crude (Brent) - a light, sweet crude oil, though not as light as WTI. Brent is the leading global price benchmark for Atlantic basin crude oils.

CBOB - Motor gasoline blending components intended for blending with oxygenates, such as ethanol, to produce finished conventional motor gasoline.

CERCLA - Comprehensive Environmental Response, Compensation and Liability Act

Colonial Pipeline - A pipeline owned and operated by the Colonial Pipeline Company that originates near Houston, Texas and terminates near New York, New York, connecting the U.S. refinery region of the Gulf Coast with customers throughout the southern and eastern United States.

Complexity Index - A measure of secondary conversion capacity of a refinery relative to its primary distillation capacity used to quantify and rank the complexity of various refineries. Generally, more complex refineries have a higher index number.

Contribution margin - Net revenues less costs of materials and other and operating expenses, excluding depreciation and amortization.

Crack spread - The crack spread is a measure of the difference between market prices for crude oil and refined products and is commonly used proxy within the industry to estimate or identify trends in refining margins.

Crude Distillation Capacity, Nameplate Capacity or Production Capacity - The maximum sustainable capacity for a refinery or process unit for a given feedstock quality and severity level, measured in barrels per day.

Cushing - Cushing, Oklahoma

Delayed Coking Unit (Coker) - A refinery unit that processes ("cracks") heavy oils, such as the bottom cuts of crude oil from the crude or vacuum units, to produce blendstocks for light transportation fuels or feedstocks for other units and petroleum coke.

Direct operating expenses - operating expenses attributed to the respective segment.

EISA - Energy Independence and Security Act of 2007.

Enterprise Pipeline System - a major product pipeline transport system that reaches from the Gulf Coast into the northeastern United States.

EPA - The Environmental Protection Agency.

Ethanol - An oxygenated blendstock that is blended with sub-grade (CBOB) or conventional gasoline to produce a finished gasoline.

E-10 - A 90% gasoline-10% ethanol blend.

E-15 - An 85% gasoline-15% ethanol blend.

E-85 - A blend of gasoline and 70%-85% ethanol.

FERC - The Federal Energy Regulatory Commission.

FIFO - First-in, first-out inventory accounting method.

Fluid Catalytic Cracking Unit or FCC Unit - A refinery unit that uses fluidized catalyst at high temperatures to crack large hydrocarbon molecules into smaller, higher-valued molecules (LPG, gasoline, LCO, etc.).

Feedstocks - Crude oil and petroleum products used as inputs in refining processes.

Gulf Coast 2-1-1 crack spread - A crack spread, expressed in dollars per barrel, reflecting the approximate gross margin resulting from processing, or "cracking", one barrel of crude oil into one-half barrel of gasoline and one-half barrel of high sulfur diesel, utilizing the market prices of LLS crude oil, Gulf Coast Pipeline conventional gasoline and Gulf Coast Pipeline No. 2 Heating Oil.

Gulf Coast 3-2-1 crack spread - A crack spread, expressed in dollars per barrel, reflecting the approximate gross margin resulting from processing, or "cracking", one barrel of crude oil into two-thirds barrel of gasoline and one-third barrel of ultra-low sulfur diesel, utilizing the market prices of WTI crude oil, Gulf Coast Pipeline conventional gasoline and Gulf Coast Pipeline ultra-low sulfur diesel.

Gulf Coast 5-3-2 crack spread - A crack spread, expressed in dollars per barrel, reflecting the approximate gross margin resulting from processing, or "cracking", one barrel of crude oil into three-fifths barrel of gasoline and two-fifths barrel of high sulfur diesel, utilizing the market prices of WTI crude oil, Gulf Coast Pipeline CBOB and Gulf Coast Pipeline No. 2 Heating Oil.

Gulf Coast Pipeline CBOB - A grade of gasoline blendstock that must be blended with 10% biofuels in order to be marketed as Regular Unleaded at retail locations.

Gulf Coast Pipeline No. 2 Heating Oil - A petroleum distillate that can be used as either a diesel fuel or a fuel oil. This is the standard by which other Gulf Coast distillate products (such as ultra-low sulfur diesel) are priced.

Gulf Coast Region - Commonly referred to as PADD III, includes the states of Texas, Arkansas, Louisiana, Mississippi, Alabama and New Mexico.

HLS - Heavy Louisiana Sweet crude oil; typical API gravity of 33° and sulfur content of 0.35%.

Hydrotreating Unit  - A refinery unit that removes sulfur and other contaminants from hydrocarbons at high temperatures and moderate to high pressure in the presence of catalysts and hydrogen. When used to process fuels, this unit reduces the sulfur dioxide emissions from these fuels.

Isomerization Unit - A refinery unit altering the arrangement of a molecule in the presence of a catalyst and hydrogen to produce a more valuable molecule, typically used to increase the octane of gasoline blendstocks.

Jobbers - Retail stations owned by third parties that sell products purchased from or through us.

LPG - Liquefied petroleum gas.

Light/Medium/Heavy Crude Oil  - Terms used to describe the relative densities of crude oil, normally represented by their API gravities. Light crude oils (those having relatively high API gravities) may be refined into a greater amount of valuable products and are typically more expensive than a heavier crude oil.

LLS - Louisiana Light Sweet crude oil; typical API gravity of 38° and sulfur content of 0.34%.

LSR - Light straight run naphtha.

LIFO - Last-in, first-out inventory accounting method.

Mid-Continent Region - Commonly referred to as PADD II, includes the states of North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Minnesota, Iowa, Missouri, Wisconsin, Illinois, Michigan, Indiana, Ohio, Kentucky and Tennessee.

Midland - Midland, Texas

MSCF/d - Abbreviation for a thousand standard cubic feet per day, a common measure for volume of natural gas.

Naphtha  - A hydrocarbon fraction that is used as a gasoline blending component, a feedstock for reforming and as a petrochemical feedstock.

NGL - Natural gas liquids.

New York Mercantile Exchange (NYMEX) - A commodities futures exchange.

OSHA - the Occupational Safety and Health Administration.

Petroleum Administration for Defense District (PADD) - Any of five regions in the United States as set forth by the Department of Energy and used throughout the oil industry for geographic reference. Our refineries operate in PADD III, commonly referred to as the Gulf Coast Region.

Petroleum Coke - A coal-like substance produced as a byproduct during the Delayed Coking refining process.

Per barrel of sales - calculated by dividing the applicable income statement line item (operating margin or operating expenses) by the total barrels sold during the period.

PPB - parts per billion.

PPM - parts per million.

RCRA - Resource Conservation and Recovery Act.

Refining margin, refined product margin - Refining margin or refined product margin is measured as the difference between net refining revenues and total refining cost of materials and other and is used as a metric to assess a refinery's product margins against market crack spread trends.

Reforming Unit - A refinery unit that uses high temperature, moderate pressure and catalyst to create petrochemical feedstocks, high octane gasoline blendstocks and hydrogen.

Renewable Fuels Standard 2 (RFS-2) - An EPA regulation promulgated pursuant to the EISA, which requires most refineries to blend increasing amounts of renewable fuels (including biodiesel and ethanol) with refined products.

Renewable Identification Number (RIN) - a renewable fuel credit used to satisfy requirements for blending renewable fuels under RFS-2.

Roofing flux - An asphalt-like product used to make roofing shingles for the housing industry.

Straight run - product produced off of the crude or vacuum unit and not further processed.

Sweet/Sour crude oil - Terms used to describe the relative sulfur content of crude oil. Sweet crude oil is relatively low in sulfur content; sour crude oil is relatively high in sulfur content. Sweet crude oil requires less processing to remove sulfur and is typically more expensive than sour crude oil.

Throughput - The quantity of crude oil and feedstocks processed through a refinery or a refinery unit.

Turnaround - A periodic shutdown of refinery process units to perform routine maintenance to restore the operation of the equipment to its former level of performance. Turnaround activities normally include cleaning, inspection, refurbishment, and repair and replacement of equipment and piping. It is also common to use turnaround periods to change catalysts or to implement capital project improvements.

Ultra-Low Sulfur Diesel (ULSD) - Diesel fuel produced with a lower sulfur content (15 ppm) to reduce sulfur dioxide emissions. ULSD is the only diesel fuel that may be used for on-road and most other applications in the U.S.

UST - Underground storage tank.

Vacuum Distillation Unit - A refinery unit that distills heavy crude oils under deep vacuum to allow their separation without coking.

West Texas Intermediate Crude Oil (WTI) - A light, sweet crude oil characterized by an API gravity between 38° and 44° and a sulfur content of less than 0.4 wt% that is used as a benchmark for other crude oils.

West Texas Sour Crude Oil (WTS) - A sour crude oil, characterized by an API gravity between 30° and 33° and a sulfur content of approximately 1.28 wt% that is used as a benchmark for other sour crudes.