SunCoke Energy, Inc.

2. Summary of Significant Accounting Policies

Except for the following, there have been no material changes to our significant accounting policies as described in our Annual Report on Form 10-Kfor the year ended December 31, 2024.

Business Combinations and Acquisition Accounting

The Company accounts for acquisitions by applying the acquisition method of accounting under Accounting Standards Codification (“ASC”) 805, Business Combinations, when the transaction or event is considered a business combination, which requires that the assets acquired and liabilities assumed constitute a business. A defined business is generally an acquired group of assets with inputs and processes that make it capable of generating a return or economic benefit for the acquirer. The acquisition method of accounting requires, among other things, that the assets acquired and liabilities assumed in a business combination be measured at their fair values as of the closing date of the acquisition.

The Company also utilizes ASC 805 for the initial recognition and measurement, subsequent measurement and disclosure of assets and liabilities arising from contingencies in business combinations. Other estimates include step-ups for fixed assets and inventory, fair values of intangible assets and income tax assets and liabilities assumed from the acquiree.

While the Company uses its best estimates and assumptions as part of the purchase price allocation process to accurately value assets acquired and liabilities assumed at the business acquisition date, the estimates and assumptions are inherently uncertain and subject to refinement. As a result, during the purchase price allocation period, which is generally one year from the business acquisition date, the Company records adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. Subsequent to the purchase price allocation period, any adjustment to assets acquired or liabilities assumed is included in operating results in the period in which the adjustment is determined. See Note 3 – Acquisitions for further detail.

Recent Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2023-09, “Income Taxes (Topic 740): Improvement to Income Tax Disclosures.” ASU 2023-09 requires additional disclosures aimed at enhancing the transparency and decision usefulness of income tax disclosures. This ASU is effective for fiscal years beginning after December 15, 2024 and requires either prospective application or retrospective application to all prior periods presented in the financial statements. The Company does not expect this ASU to have a material impact on the Company's disclosures. The Company plans to adopt the guidance for the fiscal year ending December 31, 2025.

In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income (Topic 220): Disaggregation of Income Statement Expenses.” ASU 2024-03 requires additional disclosures aimed at enhancing the transparency and decision usefulness of income statement expenses. This ASU is effective for fiscal years beginning after December 15, 2026 as well as interim periods beginning after December 15, 2027 and requires either prospective application or retrospective application to all prior periods presented in the financial statements. The Company is currently evaluating the impact of the guidance on the related disclosures. The Company plans to adopt the guidance for the fiscal year ending December 31, 2027.

In July 2025, the FASB issued ASU 2025-05, “Financial Instruments—Credit Losses (Topic 326): Measurements of Credit Losses for Accounts Receivable and Contract Assets” (“ASU 2025-05”). The amendments in this update provide a practical expedient related to the estimation of expected credit losses for current accounts receivable and current contract assets that arise from transactions accounted for under FASB Accounting Standards Codification 606. Under ASU 2025-05, an entity is required to disclose whether it has elected to use the practical expedient. ASU 2025-05 is effective for annual periods, including interim reporting periods within annual reporting periods, beginning after December 15, 2025 with early adoption permitted. The Company is currently evaluating the impacts of the adoption of ASU 2025-05 on the consolidated financial statements.