SUNCOKE ENERGY, INC. ANNOUNCES 2023 RESULTS AND PROVIDES FULL-YEAR 2024 GUIDANCE • Net income attributable to SXC was $57.5 million, or $0.68 per diluted share, for the full-year 2023; Net income attributable to SXC was $13.8 million, or $0.16 per diluted share, in the fourth quarter 2023 • Full-year 2023 consolidated Adjusted EBITDA(1) was $268.8 million; fourth quarter 2023 consolidated Adjusted EBITDA(1) was $62.3 million • Operating cash flow was $249.0 million for the full-year 2023 • Full-year 2024 consolidated Adjusted EBITDA(1) is expected to be between $240 million and $255 million LISLE, Ill. (February 1, 2024) - SunCoke Energy, Inc. (NYSE: SXC) (the "Company" or "SunCoke") today reported fourth quarter and full-year 2023 results, reflecting solid performance from our cokemaking business. "In 2023, the SunCoke team successfully navigated through challenging market conditions and proved our operational capability, with strong Domestic Coke performance driving solid results," said Katherine Gates, President of SunCoke Energy, Inc. "We are pleased with the progress we made on our capital allocation goals in 2023, notably reducing gross debt by approximately $44 million and increasing our quarterly dividend by 25%. We continued to advance our foundry business by completing the foundry coke expansion project and expanding our market participation. Additionally, the extension of our Indiana Harbor coke contract with Cleveland-Cliffs for an additional 12 years positions our largest coke plant favorably for the future." "We expect 2024 consolidated Adjusted EBITDA to be between $240 million and $255 million, with our Domestic Coke segment continuing to operate at full capacity, while our Logistics segment is impacted by weakness in the thermal coal markets impacting volumes as well as pricing," Gates continued. "As we enter the new year, we remain focused on executing against our well established objectives of exceptional safety performance, operational excellence, and a balanced approach to capital allocation. We are confident that we will execute against these objectives and continue to deliver significant value to SunCoke stakeholders." (1) See definition and reconciliation of Adjusted EBITDA elsewhere in this release.

CONSOLIDATED RESULTS Three Months Ended December 31, Years Ended December 31, (Dollars in millions) 2023 2022 Increase/ (Decrease) 2023 2022 Increase/ (Decrease) Revenues $ 520.6 $ 514.0 $ 6.6 $ 2,063.2 $ 1,972.5 $ 90.7 Net income attributable to SXC $ 13.8 $ 11.8 $ 2.0 $ 57.5 $ 100.7 $ (43.2) Adjusted EBITDA(1) $ 62.3 $ 58.9 $ 3.4 $ 268.8 $ 297.7 $ (28.9) (1) See definition and reconciliation of Adjusted EBITDA elsewhere in this release. Revenues increased during both the fourth quarter and full-year 2023 as compared to the same prior year periods, primarily reflecting the pass-through of higher coal costs in the Domestic Coke segment, partially offset by lower volumes at Convent Marine Terminal (“CMT”) in the Logistics segment. Net income attributable to SXC for the fourth quarter 2023 increased from the same prior year period, driven by higher coal-to-coke yields and favorable O&M recovery on our long-term, take-or-pay contracts and lower interest expense. Net income attributable to SXC for the full-year 2023 decreased from the same prior year period, driven by the same factors contributing to the lower Adjusted EBITDA described below and tax law changes in the United States and Brazil in both 2022 and 2023. Full-year 2022 included deferred tax benefits from foreign tax credits and the release of valuation reserves of $15.9 million recorded in third quarter of 2022, while full-year 2023 includes the impact of a deferred tax expense from the establishment of an $8.4 million valuation allowance related to foreign tax credits recorded in the second half of 2023. Fourth quarter 2023 Adjusted EBITDA increased as compared to the same prior year period, primarily driven by higher coal-coke-yields and favorable O&M recovery on our long-term, take-or-pay contracts, partially offset by lower volumes at CMT in the Logistics segment. Full-year 2023 Adjusted EBITDA decreased as compared to the same prior year period, primarily driven by lower contribution margins on non-contracted coke sales and lower volumes at CMT in the Logistics segment, partially offset by higher coal-to-coke yields on our long-term, take-or-pay contracts. SEGMENT RESULTS Domestic Coke Domestic Coke consists of cokemaking facilities and heat recovery operations at our Jewell, Indiana Harbor, Haverhill, Granite City and Middletown plants. Three Months Ended December 31, Years Ended December 31, (Dollars in millions, except per ton amounts) 2023 2022 Increase/ (Decrease) 2023 2022 Increase/ (Decrease) Revenues $ 493.6 $ 485.1 $ 8.5 $ 1,954.0 $ 1,856.9 $ 97.1 Adjusted EBITDA(1) $ 55.2 $ 46.5 $ 8.7 $ 247.8 $ 263.4 $ (15.6) Sales Volume (in thousands of tons) 1,037 1,040 (3) 4,046 4,031 15 Adjusted EBITDA per ton(2) $ 53.23 $ 44.71 $ 8.52 $ 61.25 $ 65.34 $ (4.09) (1) See definition and reconciliation of Adjusted EBITDA elsewhere in this release. (2) Reflects Domestic Coke Adjusted EBITDA divided by Domestic Coke sales volumes. The increases in revenues for both the fourth quarter and full-year 2023 as compared to the same prior year periods primarily reflect the pass-through of higher coal costs. Fourth quarter 2023 Adjusted EBITDA increased as compared to the same prior year period, primarily reflecting higher coal-to-coke yields and favorable O&M recovery on our long-term, take-or-pay contracts, partially offset by lower contribution margins on non-contracted blast coke sales. Full-year 2023 Adjusted EBITDA decreased as compared to the same prior year period, driven by lower contribution margins on non-contracted blast coke sales, partially offset by higher coal-to-coke yields on our long-term, take-or-pay contracts. 2

Logistics Logistics consists of the handling and mixing services of coal and other aggregates at our Convent Marine Terminal (“CMT”), Lake Terminal, and Kanawha River Terminals (“KRT”). Three Months Ended December 31, Years Ended December 31, (Dollars in millions) 2023 2022 Increase/ (Decrease) 2023 2022 Increase/ (Decrease) Revenues $ 17.6 $ 18.8 $ (1.2) $ 74.0 $ 77.6 $ (3.6) Intersegment sales $ 5.2 $ 6.7 $ (1.5) $ 22.1 $ 28.9 $ (6.8) Adjusted EBITDA(1) $ 10.7 $ 11.7 $ (1.0) $ 44.3 $ 49.7 $ (5.4) Tons handled (thousands of tons)(2) 5,022 5,525 (503) 20,483 22,291 (1,808) (1) See definition and reconciliation of Adjusted EBITDA elsewhere in this release. (2) Reflects inbound tons handled during the period. The decreases in both revenues and Adjusted EBITDA for the fourth quarter and full-year 2023 as compared to the same prior year periods were driven by lower volumes at CMT. Brazil Coke Brazil Coke consists of a cokemaking facility in Vitória, Brazil, which we operate for an affiliate of ArcelorMittal. Three Months Ended December 31, Years Ended December 31, (Dollars in millions) 2023 2022 Increase/ (Decrease) 2023 2022 Increase/ (Decrease) Revenues $ 9.4 $ 10.1 $ (0.7) $ 35.2 $ 38.0 $ (2.8) Adjusted EBITDA(1) $ 2.2 $ 3.1 $ (0.9) $ 9.1 $ 14.5 $ (5.4) Brazilian Coke production—operated facility (thousands of tons) 383 377 6 1,558 1,585 (27) (1) See definition and reconciliation of Adjusted EBITDA elsewhere in this release. Revenues and Adjusted EBITDA for the fourth quarter and full-year 2023 decreased as compared to the same prior year periods, primarily driven by the absence of technology fees, which expired at the end of 2022. Corporate and Other Corporate expenses that can be identified with a segment have been included in determining segment results. The remainder is included in Corporate and Other, which is not a reportable segment. Three Months Ended December 31, Years Ended December 31, (Dollars in millions) 2023 2022 Increase/ (Decrease) 2023 2022 Increase/ (Decrease) Adjusted EBITDA(1) $ (5.8) $ (2.4) $ (3.4) $ (32.4) $ (29.9) $ (2.5) (1) See definition and reconciliation of Adjusted EBITDA elsewhere in this release. Corporate and Other Adjusted EBITDA results were unfavorable for the fourth quarter and full-year 2023 as compared to the same prior year periods, reflecting unfavorable valuation adjustments as a result of changes in discount rates on certain legacy liabilities, which increased legacy cost approximately $5.7 million during the fourth quarter 2023, partially offset by lower employee related expenses. 3

2024 OUTLOOK Our 2024 guidance is as follows: • Domestic coke total production is expected to be approximately 4.1 million tons • Consolidated Net Income is expected to be between $67 million and $84 million • Consolidated Adjusted EBITDA is expected to be between $240 million to $255 million • Capital expenditures are projected to be between $75 million and $80 million • Operating cash flow is estimated to be between $185 million and $200 million • Cash taxes are projected to be between $20 million and $25 million RELATED COMMUNICATIONS We will host our quarterly earnings call at 11:00 a.m. Eastern Time (10:00 a.m. Central Time) today. The conference call will be webcast live and archived for replay in the Investors section of www.suncoke.com. Investors and analysts may participate in this call by dialing 1-833-470-1428 in the U.S. or 1-404-975-4839 if outside the U.S., access code 202670. SUNCOKE ENERGY, INC. SunCoke Energy, Inc. (NYSE: SXC) supplies high-quality coke to domestic and international customers. Our coke is used in the blast furnace production of steel as well as the foundry production of casted iron, with the majority of sales under long-term, take-or-pay contracts. We also export coke to overseas customers seeking high-quality product for their blast furnaces. Our process utilizes an innovative heat-recovery technology that captures excess heat for steam or electrical power generation and draws upon more than 60 years of cokemaking experience to operate our facilities in Illinois, Indiana, Ohio, Virginia and Brazil. Our logistics business provides export and domestic material handling services to coke, coal, steel, power and other bulk customers. The logistics terminals have the collective capacity to mix and transload more than 40 million tons of material each year and are strategically located to reach Gulf Coast, East Coast, Great Lakes and international ports. To learn more about SunCoke Energy, Inc., visit our website at www.suncoke.com. SunCoke routinely announces material information to investors and the marketplace using press releases, Securities and Exchange Commission filings, public conference calls, webcasts and SunCoke's website at http:// www.suncoke.com/English/investors/sxc. The information that SunCoke posts to its website may be deemed to be material. Accordingly, SunCoke encourages investors and others interested in SunCoke to routinely monitor and review the information that SunCoke posts on its website, in addition to following SunCoke's press releases, Securities and Exchange Commission filings and public conference calls and webcasts. NON-GAAP FINANCIAL MEASURES In addition to U.S. GAAP measures, this press release contains certain non-GAAP financial measures. These non- GAAP financial measures should not be considered as alternatives to the measures derived in accordance with U.S. GAAP. Non-GAAP financial measures have important limitations as analytical tools, and you should not consider them in isolation or as substitutes for results as reported under U.S. GAAP. Additionally, other companies may calculate non-GAAP metrics differently than we do, thereby limiting their usefulness as a comparative measure. Because of these and other limitations, you should consider our non-GAAP measures only as supplemental to other U.S. GAAP-based financial performance measures, including revenues and net income. Reconciliations to the most comparable GAAP financial measures are included following the presentation of financial and operating results included at the end of this press release. DEFINITIONS • Adjusted EBITDA represents earnings before interest, taxes, depreciation and amortization (“EBITDA”), adjusted for any impairments, restructuring costs, gains or losses on extinguishment of debt, and/or transaction costs ("Adjusted EBITDA"). EBITDA and Adjusted EBITDA do not represent and should not be considered alternatives to net income or operating income under GAAP and may not be comparable to other similarly titled measures in other businesses. Management believes Adjusted EBITDA is an important measure in assessing operating performance. Adjusted EBITDA provides useful information to investors because it highlights trends in our 4