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beyond the best August 7 , 2026 2Q 2026 Earnings Release KUMHO PETROCHEMICAL

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2 The business result for the 2nd quarter of 2026 is currently under the audit process, however this is presented purely for the purposes of investors’ convenience. Hence, please be advised that some of the contents may be altered in the course of audit. Forecasts and projections contained in this material are based on current business environments and management strategies, so these may differ from the actual result upon changes and unaccounted variables.

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01. 2Q 2026 Business Results 02. Divisional Results 03. Appendix

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(Unit: KRW bn) Classification 26.2Q 26.1Q QoQ 25.2Q YoY Sales 2,268.1 1,780.0 27.4% 1,773.4 27.9% Operating Profit 339.0 (14.9%) 59.4 (3.3%) 470.7% 65.2 (3.7%) 419.9% EBITDA 416.8 (18.4%) 137.0 (7.7%) 204.2% 143.3 (8.1%) 190.9% Pre-tax Income 388.0 (17.1%) 117.8 (6.6%) 229.4% 67.5 (3.8%) 474.8% Net Income 300.3 (13.2%) 96.3 (5.4%) 211.8% 57.6 (3.2%) 421.4% Equity Income 37.5 36.8 1.9% 29.9 25.4% 2Q 2026 Business Results Income Statements 1 * Net Income is based on Controlling interests.

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(Unit: KRW bn) Classification 26.2Q 25 (End) Change Asset (Cash and equivalents) 9,065.2 (652.6) 8,474.5 (650.4) 7.0% (0.3%) Liabilities (Debt) 2,320.4 (743.0) 2,228.0 (879.8) 4.1% (-15.5%) Shareholder’s Equity 6,744.8 6,246.5 8.0% Liabilities/ Equity (%) 34.4% 35.7% -1.3%p 2Q 2026 Business Results Balance Sheet Classification 26.2Q 25 (End) Change Debt/Equity 11.0% 14.1% -3.1%p Net Debt /Equity 1.3% 3.7% -2.4%p Interest Coverage Ratio (x) 18.6 6.2 12.4 ROE 12.2% 4.7% 7.5%p ROA 9.0% 3.5% 5.5%p Financial Ratios 2

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Divisional Results & Outlook 2Q Earnings Review • Flexible production/sales adjustments and inventory minimization to promote efficient operations amid US-Iran war supply chain risks. • Spreads for major products improved QoQ due to growing market demand to secure volume. • NB Latex turned profitable driven by increased demand and spread expansion following higher glove manufacturer operating rates early in the quarter. 19.4Q 20.1Q 20.2Q 20.3Q 20.4Q 3Q Outlook • BD: Short-term price strength expected due to Middle East tensions, but prices are projected to adjust downward mid-quarter on weak derivative demand. • Profitability declined QoQ due to wait-and-see stance from buyers following weaker raw material prices and narrowing spreads for major products. Synthetic Rubbers 3 Operating Profit (%) (Unit: KRW bn) Sales 25.2Q 25.3Q 25.4Q 26.1Q 26.2Q 8.5 (1.3%) 31.2 (4.9%) 15.8 (2.6%) 14.9 (2.0%) 189.8 (19.2%) 674.5 632.2 607.3 733.5 987.1

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Divisional Results & Outlook 2Q Earnings Review • Profitability improved QoQ, driven by higher product prices amid raw material supply concerns. 3Q Outlook • SM: Despite weak downstream demand, market price declines are expected to be limited due to a short-term rise in international oil prices and regional production cuts. • EscalatingMiddleEast risksand the onsetof the off-seasonare expected to keep the actual demand subdued, maintaining downwardpressureon prices. Synthetic Resins 4 (Unit: KRW bn) Operating Profit (%) Sales 25.2Q 25.3Q 25.4Q 26.1Q 26.2Q 5.3 (1.8%) 4.4 (1.6%) -9.5 (-3.6%) -2.2 (-0.7%) 37.4 (10.0%) 298.2 272.5 266.2 301.8 375.4

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Divisional Results & Outlook 2Q Earnings Review • Turned profitable QoQ despite maintenance-driven volume declines, supported by spread expansion and customerrestockingdemand. 3Q Outlook • Major productspreadsare expectedto narrow as weak downstreamdemand and negative lagging risks weigh on buyersentiment. Phenol Derivatives 5 (Unit: KRW bn) Operating Profit (%) Sales 25.2Q 25.3Q 25.4Q 26.1Q 26.2Q -2.3 (-0.5%) -14.4 (-3.8%) -22.3 (-6.1%) -8.6 (-2.2%) 55.1 (11.2%) 378.7 364.5 399.2 399.2 492.8

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Divisional Results & Outlook 2Q Earnings Review • Profitability improved QoQ despite a slight volume decline from scheduled maintenance, supported by expanded product spreads. 3Q Outlook • Profitability is expected to decline slightly due to off-season slowdown and weak market demand. EPDM/TPV 6 (Unit: KRW bn) 25.2Q 25.3Q 25.4Q 26.1Q 26.2Q 15.0 (8.3%) 20.2 (11.5%) 19.8 (10.7%) 31.1 (15.8%) 47.4 (20.9%) 180.6 175.4 185.6 196.8 227.1 Operating Profit (%) Sales

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Divisional Results & Outlook 2Q Earnings Review • Energy: Profitability declined as rising coal prices offset strong SMP levels. 19.4Q 20.1Q 20.2Q 20.3Q 20.4Q Others 7 (Unit: KRW bn) Specialty Chemicals Energy Others Sales Operating Profit(%) Energy/Specialty Chemicals/Others 3Q Outlook • Energy: Profitability is expected to improve QoQ, driven by raw material price stabilization and sustained SMP strength. 25.2Q 25.3Q 25.4Q 26.1Q 26.2Q 38.7 (20.7%) 43.1 (23.3%) -2.3 (-1.4%) 24.2 (16.3%) 9.3 (5.0%) 148.7 185.7 166.1 187.5 185.0 48.6 36.9 36.6 45.0 53.0 52.2 55.9 55.2 43.4 53.0 86.7 92.2 74.3 60.3 79.7

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APPENDIX (Unit: KRW bn) Classification 2025 2026 1Q 2Q 3Q 4Q Total 1Q 2Q 3Q 4Q Total Sales 1,908.2 1,773.4 1,643.8 1,589.7 6,915.1 1,780.0 2,268.1 4,048.1 Operating Profit 120.6 65.2 84.5 1.5 271.8 59.4 339.0 398.4 Net Interest Expense 2.9 12.3 1.2 -0.1 16.3 -0.1 2.8 2.7 Equity Income 30.6 29.9 37.4 33.2 131.1 36.8 37.5 74.3 Pre-tax Income 157.3 67.5 128.4 -4.3 348.9 117.8 388.0 505.8 Net Income 125.0 57.6 106.9 1.4 290.9 96.3 300.3 396.6 Quarterly Performance 8 * Net Income is based on Controlling interests.

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APPENDIX Production Capacity (KKPC) 9 Classification Product Capa Unit Note Synthetic Rubbers SBR 263,000 MT/Y B R HBR 165,000 NdBR 60,000 LBR 50,000 S-SBR 158,000 Completion of Expansion 35,000MT/Y, 4Q, ’25 NBR 94,000 HSR 10,000 NB Latex 946,000 SB Latex 85,000 SBS 113,000 Total 1,944,000 Synthetic Resins PS 264,500 MT/Y ABS 290,000 SAN/Powder 237,000 EPS 79,500 PPG 151,500 Total 1,022,500 Specialty Chemicals Antioxidants 70,800 MT/Y Energy Steam 1,710 T/H Electricity 300 MWH BD Ulsan 90,000 MT/YYeosu 147,000 Total 237,000

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APPENDIX Production Capacity (Affiliates) 10 Classification Product Capa Unit Note Kumho P&B Chemicals Phenol 680,000 MT/Y Acetone 420,000 MIBK 60,000 Cumene 900,000 BPA 450,000 Epoxy Resin 338,000 Total 2,848,000 Kumho Mitsui Chemicals MDI 610,000 MT/Y Completion of Debottlenecking 100,000MT/Y, 4Q, ’26 Aniline 10,000 Total 620,000 Kumho Polychem EP(D)M 310,000 MT/YTPV/KEPA 12,000 Total 322,000

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APPENDIX Sales Breakdown & Export Share by Region Synthetic Rubbers Synthetic Resins Domestic 16% S.E.Asia 45% S.W.Asia 18% China 17% Europe 10% America 9% Others 1% Domestic 35% China 26% America 20% Europe 17% S.E.Asia 15% S.W.Asia 13% Africa 9% 11 Export 84% Export 65%

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KKPC APPENDIX Investment Shares & Financial assets at fair value Major Shareholder 18.1% Treasury Stock 10.4% Investments in Affiliates KumhoP&B Chemicals 100.0% KumhoPolychem 100.0% KumhoMitsui Chemicals 50.0% KumhoTerminal & Logistics100.0% Korea Energy Power Plants 96.1% Financial assets at fair value Asiana Airlines 4.0% Daewoo E&C 1.6% 12 * As of 30th Jun, 2026. based on common shares

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