#1Amkor Technology® Enabling The Future Amkor Technology Investor Presentation November 2023 © 2023 Amkor Technology, Inc.#2Disclaimer Forward-Looking Statement Disclaimer This presentation contains forward-looking statements within the meaning of the federal securities laws. You are cautioned not to place undue reliance on forward-looking statements, which are often characterized by terminology such as "may," "will," "should," "expects," "plans," "anticipates," "believes," "estimates,” “predicts," "potential," "continue," or "intend,” by the negative of these terms or other comparable terminology or by discussions of strategy, plans or intentions. All forward-looking statements in this presentation are made based on our current expectations, forecasts, estimates and assumptions. Because such statements include risks and uncertainties, actual results may differ materially from those anticipated in such forward-looking statements as a result of various factors, including those set forth in our Annual Report on Form 10-K for the year ended December 31, 2022 (the "Form 10-K") and from time to time in our other reports filed with or furnished to the Securities and Exchange Commission ("SEC"). You should carefully consider the trends, risks and uncertainties described in this presentation, the Form 10-K and other reports filed with or furnished to the SEC before making any investment decision with respect to our securities. If any of these trends, risks or uncertainties continues or occurs, our business, financial condition or operating results could be materially and adversely affected, the trading prices of our securities could decline, and you could lose part or all of your investment. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by this cautionary statement. We assume no obligation to review or update any forward-looking statements to reflect events or circumstances occurring after the date of this presentation, except as may be required by applicable law. Non-GAAP Measures This presentation contains certain measures that are not defined terms under U.S. generally accepted accounting principles ("GAAP"). These non-GAAP measures should not be considered in isolation or as a substitute for, or superior to, measures of liquidity or performance prepared in accordance with U.S. GAAP and may not be comparable to calculations of similarly titled measures by other companies. See the Appendix for a description of these financial measures and a reconciliation of all such non-GAAP financial measures to the most directly comparable U.S. GAAP financial measures. Amkor Technology® © 2023 Amkor Technology, Inc. 2#3Amkor's Strong Track Record Trusted Partner Founded in 1968 Building the Future $908M 2022 CapEx Ꮕ Leadership Position #1 Automotive OSAT Engaged with Industry Leaders 700 R&D Engineers $7.1B Revenue in 2022 Broad geographic footprint 12/12M sqft Countries (1.1M sqm) Manufacturing Space in 8 Countries 30,000+ Employees Amkor Technology® Ꮕ 76% 2022 Advanced Packaging % of Revenue © 2023 Amkor Technology, Inc. 3#4Megatrends Propel Semiconductor Growth $1 Trillion Semiconductor Market ($ in billions) Smart and Connected Trends $500 Laptop Desktop Mobile Gaming Home Audio $0 Amkor Technology® Smartphones Data Centers 覽 賢金 ΑΙ 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 2022 ||||||| 5G 2030E Source: Gartner, McKinsey © 2023 Amkor Technology, Inc. 4#5Packaging and Test Integral to Semiconductor Supply Chain Early design engagement with OEMs and semiconductor companies enhances packaging innovation Original Equipment Semiconductor Manufacturers Companies Wafer Manufacturing Packaging and Test Final Product Assembly Smartphone & Tablet Fabless Wafer Foundry IDM IDM Fab OSAT IDM Factory EMS Automotive Consumer Electronics Hyperscalers, PC Amkor Technology® Amkor Technology Ⓡ © 2023 Amkor Technology, Inc. 5#6Amkor's Turnkey Service Offering Reduce Cycle Time, Increase Value Design Innovation Materials Wafer Bump, Management Probe, Dicing Package Assembly Final Test Drop SLT Ship Amkor WLFO Memory Amkor Technology® Amkor fcCSP Flip Chip, PoP MCM, 2.5D, 3D SiP, Heterogeneous Integration MEMS & Sensors Leadframe, Power © 2023 Amkor Technology, Inc. 6#7Strategic Focus Areas Leverage Our Key Differentiators Technology Leverage Advanced Packaging Leadership Geographic Footprint Markets Support Global & Enable Local Supply Chains Focus on Industry Megatrends Tier 1 OSAT with complete Advanced packaging and test portfolio Trusted innovation partner for industry leaders Proven operational excellence track record Broadest OSAT geographic footprint Expanding in Vietnam Well positioned to enable regional supply chains 5G communications Automotive electronics HPC and Al IoT devices Amkor Technology® © 2023 Amkor Technology, Inc. 7#8Amkor is an Advanced Packaging Leader Industry Megatrends Rely on Advanced Packaging Innovation Heterogeneous Integration Amkor DSMBGA Amkor Technology® Miniaturization Power Management Improved Performance 1000 0000000 000000 000000 © 2023 Amkor Technology, Inc. 8#9Broad Geographic Footprint 12 Million Square Feet (1.1M sqm) of Manufacturing Space KOREA 4.44M sf (0.41M sqm) Amkor Technology® Ale JAPAN 1.82M sf (0.17M sqm) SHANGHAI 1.40M sf (0.13M sqm) TAIWAN 1.12M sf (0.10M sqm) VIETNAM 1.18M sf (0.11M sqm) PHILIPPINES 1.32M sf (0.12M sqm) MALAYSIA 0.39M sf (0.04M sqm) SINGAPORE PORTUGAL 0.52M sf (0.05M sqm) Amkor Headquarters Assembly & Test Facility Sales/Customer Support Center © 2023 Amkor Technology, Inc. 9#10Diversified End Markets Leveraged to Industry Megatrends 2022 Results 44% 20% 20% 16% Communications Smartphones | Tablets Automotive & Industrial ADASI Safety Electrification | Infotainment Consumer A/R & Gaming | Wearables Connected Home I Home Electronics Computing Data Center | Storage Infrastructure | PC/Laptops Amkor Technology® © 2023 Amkor Technology, Inc. 10#11Communications Amkor Supports All Smartphone Functions Sub-system Modules Apps Processor Amkor Technology® RF Front End Sub-6 Ghz & mmWave Sensors C Megatrend Drivers Enhanced 5G connectivity Increasing performance requirements 6G Storage Expanding features Baseband 5G 4G Wireless Charging © 2023 Amkor Technology, Inc. 11#12Automotive Electrification Amkor is the Leading Automotive OSAT Э AD & ADAS Sic Amkor Technology® Instrument Clusters V2X LIDAR Radar EV EV In-car Networking Megatrend Drivers Autonomous functionality Infotainment, telematics, digital cockpit Electrification Power Modules © 2023 Amkor Technology, Inc. 12#13IoT Consumer Products Amkor is Enabling the Proliferation of loT Amkor Technology® System Modules PMIC 10:08 4:12 GPS Connectivity Apps Processor G▸ Health Sensor Wireless Charging Megatrend Drivers Ultra small form factor with multiple functions Hearables, wearables, fitness and health, smart homes Connected everything Security © 2023 Amkor Technology, Inc. 13#14High Performance Computing Amkor's Capabilities Support All Big Data Requirements HPC Hetero- geneous Integration Amkor Technology® Machine Learning ARM Hyperscale Enterprise MATACENTER Artificial Intelligence Cloud Computing Edge Computing Megatrend Drivers Expanding cloud requirements for data center and infrastructure Increased storage needs De-verticalization, new fabless entrants © 2023 Amkor Technology, Inc. 14#15CapEx Supports Growth and Innovation Capital Expenditures ($ in millions) 12.7% 11.7% 10.9% Amkor Technology® 12.8% 12.7% $908 $780 $547 $553 $472 2018 2019 2020 Captial Expenditures 2021 -Capital Intensity % (1) 2022 Expect 2023 Capital Expenditures (2) of Around $750M Key Areas of Investment Advanced Technology: SiP, Flip Chip, Wafer Level Packaging Test Capacity and Capability New Vietnam Factory See corresponding endnotes on slide 25. © 2023 Amkor Technology, Inc. 15#16Financial Results ($ in millions except for EPS) Revenue $7,092 $6,138 $5,051 $4,316 $4,053 о EPS $3.11 $2.62 $1.40 $0.53 $0.50 2018 2019 2020 2021 2022 2018 (3) 2019 (4) 2020 (5) 2021 2022 EBITDA * 12.7% 12.4% 21.7% 21.5% 19.4% 18.6% 19.0% Operating Income 9.1% 6.0% 5.8% $897 $763 $457 $258 $837 $1,529 $1,331 $960 $233 $756 (4) 2018 2019 2020 Operating Income 2021 -Operating Margin 2022 2018 2019 EBITDA* 2020 2021 -EBITDA Margin* 2022 See corresponding endnotes on slide 25. Amkor Technology® *See discussion of Non-GAAP measures on slide 24 and the reconciliation to the most directly comparable GAAP measure on slide 22. © 2023 Amkor Technology, Inc. 16#17Free Cash Flow and Balance Sheet Position ($ in millions) Free Cash Flow* $221 $344 $194 $689 Positive Balance Sheet Trends $1,241 $1,079 $901 $832 $643 $549 $322 $120 $104 $59 ($9) 2018 2019 2020 2021 2022 2018 2019 2020 2021 2022 Amkor Technology® -Total Cash and Short Term Investments -Net Debt* Increased Liquidity Reduced Leverage *See discussion of Non-GAAP measures on slide 24 and the reconciliation to the most directly comparable GAAP measure on slides 22-23. © 2023 Amkor Technology, Inc. 17#18Enhancing Shareholder Value Invest in Organic Growth Invest in manufacturing scale and in diversifying global footprint ►Invest in R&D to enhance technology in partnership with lead customers ▸ Strategic Investments Support regional semiconductor supply chains Selective M&A for strategic business growth Maintain Balance Sheet Strength & Flexibility Gross debt leverage* at or below 1.5X Maintain strong liquidity for maximum flexibility Shareholder Returns ► Return 40%-50% of Free Cash Flow* over time1 Growth in regular quarterly dividend² Amkor Technology® 1 Cumulative free cash flow starting 2022; 2 Subject to Board approval *See discussion of Non-GAAP measures on slide 24 and the reconciliation to the most directly comparable GAAP measure on slides 22-23. © 2023 Amkor Technology, Inc. 18#19Embedded ESG Commitment Mission Pursue agile and dependable manufacturing that drives sustainable practices, aligns with our core values of reliability and trust and maintains our commitments to customers, suppliers, employees, business partners and shareholders Amkor Technology® Reporting Frameworks ► SASB Semiconductor Standard ► CDP (Carbon Disclosure Project) Governance ► Nominating and Governance Committee ➤ ESG Committee Industry Coalition ► Responsible Business Alliance ► Responsible Minerals Initiative Environmental Goals ► 20% reduction in GHG emissions, water usage and waste generation by 2030 ► Committed to setting SBTi-aligned near term and net zero targets © 2023 Amkor Technology, Inc. 19#20Investment Appeal Advanced packaging technology focus and leadership Geographically diverse manufacturing footprint Positioned to Outgrow the Semiconductor Market Amkor Technology® Leveraged to industry megatrends 5G, Automotive, HPC, loT © 2023 Amkor Technology, Inc. 20#21Amkor Technology® Appendix © 2023 Amkor Technology, Inc. 21#22Financial Reconciliation Tables ($ in millions) 2018 (3) 2019(4),(6) (5) 2020 2021 2022 Net Income $130 $123 $340 $646 $767 Plus: Interest Expense 79 72 64 52 59 Plus: Income Tax Expense 56 37 46 69 90 Plus: Depreciation & Amortization 572 524 510 564 613 EBITDA* $837 $756 $960 $1,331 $1,529 Net Sales $4,316 $4,053 $5,051 $6,138 $7,092 Net Income Margin 3.0% 3.0% 6.7% 10.5% 10.8% EBITDA Margin* 19.4% 18.6% 19.0% 21.7% 21.5% Total Debt $1,332 $1,450 $1,154 $1,138 $1,232 Less: Cash and Cash Equivalents (682) (895) (698) (827) (959) Less: Short Term Investment (7) (6) (134) (252) (282) Net Debt* $643 $549 $322 $59 ($9) Debt/Net Income Ratio 10.3 11.8 3.4 1.8 1.6 Gross Debt Leverage* 1.6 1.9 1.2 0.9 0.8 See corresponding endnotes on slide 25. Amkor Technology® *See discussion of Non-GAAP measures on slide 24. © 2023 Amkor Technology, Inc. 22#23Financial Reconciliation Tables Amkor Technology® ($ in millions) 2018 2019 2020 2021 2022 Net Cash Provided by Operating Activities $663 $564 $770 $1,121 $1,099 Less: Payments for Property, Plant and Equipment (547) (472) (553) (780) (908) Plus: Proceeds from Sale of and Insurance Recovery for Property, Plant and Equipment 4 12 4 3 3 Free Cash Flow* $120 $104 $221 $344 $194 *See discussion of Non-GAAP measures on slide 24. © 2023 Amkor Technology, Inc. 23#24Non-GAAP Measures Generally, a non-GAAP financial measure is a numerical measure of a company's performance, financial position or cash flows that either excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with U.S. GAAP. In this presentation we refer to EBITDA, EBITDA Margin and Gross Debt Leverage, which are not defined by U.S. GAAP. We define EBITDA as net income before interest expense, income tax expense and depreciation and amortization. EBITDA Margin is calculated by dividing EBITDA by net sales for the period. Gross Debt Leverage is calculated by dividing Total Debt by EBITDA for the period. We believe EBITDA, EBITDA Margin, and Gross Debt Leverage to be relevant and useful information to our investors because they provide additional information in assessing our financial operating results. Our management uses EBITDA, EBITDA Margin and Gross Debt Leverage in evaluating our operating performance, our ability to service debt and our ability to fund capital expenditures. However, EBITDA, EBITDA Margin, and Gross Debt Leverage have certain limitations in that they do not reflect the impact of certain expenses on our consolidated statements of income, including interest expense, which is a necessary element of our costs because we have borrowed money in order to finance our operations, income tax expense, which is a necessary element of our costs because taxes are imposed by law, and depreciation and amortization, which is a necessary element of our costs because we use capital assets to generate income. EBITDA, EBITDA Margin, and Gross Debt Leverage should be considered in addition to, and not as a substitute for, or superior to, operating income, net income, net income margin, debt/net income or other measures of financial performance prepared in accordance with U.S. GAAP. Furthermore, our definition of EBITDA may not be comparable to similarly titled measures reported by other companies. Please see Slide 22 for the reconciliation of these non-GAAP measures to the most directly comparable U.S. GAAP measures. Net Debt is not defined by U.S. GAAP. We define Net Debt as total debt as reported on the consolidated balance sheet less the sum of cash and cash equivalents, and short-term investments. We believe Net Debt to be relevant and useful information to our investors because it provides them with additional information in assessing our capital structure, financial leverage, and our ability to reduce debt and to fund investing and financing activities. Our management uses Net Debt to review our overall liquidity, financial flexibility, capital structure, and financial leverage. However, Net Debt has certain limitations, including that it should not be considered as an alternative to or in isolation from total debt or any other measure calculated in accordance with U.S. GAAP. This measure should be considered in addition to, and not as a substitute for, or superior to, total debt, prepared in accordance with U.S. GAAP. Furthermore, our definition of Net Debt may not be comparable to similarly titled measures reported by other companies. Please see Slide 22 for the reconciliation to the most directly comparable U.S. GAAP measure. Free cash flow is not defined by U.S. GAAP. We define Free Cash Flow as net cash provided by operating activities less payments for property, plant and equipment, plus proceeds from the sale of, insurance recovery for property, plant and equipment, if applicable. We believe Free Cash Flow to be relevant and useful information to our investors because it provides them with additional information in assessing our liquidity, capital resources and financial operating results. Our management uses Free Cash Flow in evaluating our liquidity, our ability to service debt, and our ability to fund capital expenditures and pay dividends. However, Free Cash Flow has certain limitations, including that it does not represent the residual cash flow available for discretionary expenditures since other, non-discretionary expenditures, such as mandatory debt service, are not deducted from the measure. The amount of mandatory versus discretionary expenditures can vary significantly between periods. This measure should be considered in addition to, and not as a substitute for, or superior to, other measures of liquidity or financial performance prepared in accordance with U.S. GAAP, such as net cash provided by operating activities. Furthermore, our definition of Free Cash Flow may not be comparable to similarly titled measures reported by other companies. Please see Slide 23 for the reconciliation to the most directly comparable U.S. GAAP measure. Amkor Technology® © 2023 Amkor Technology, Inc. 24#25Endnotes 1. Capital intensity is defined as capital expenditures as a percentage of net sales. 2. This financial guidance is from our October 30, 2023 earnings release and is reproduced here for convenience of reference only. This reference is not intended, and should not be relied upon, as a reaffirmation or other commentary with respect to such financial guidance. Please see slide 2. 3. 2018 net income includes a $17 million discrete income tax charge, or $0.07 per diluted share, driven by finalizing the accounting for U.S. tax reform. 4. 2019 net income includes an $8 million charge, or $0.03 per share, related to the early redemption of $525 million of senior notes due 2022 and a net $11 million discrete income tax charge, or $0.05 per diluted share, related to changes in the valuation of certain deferred tax assets. 5. 2020 net income includes a $20 million discrete income tax benefit, or $0.08 per diluted share, primarily related to changes in the valuation of certain deferred tax assets. 6. In Q1 2020, we repaid $120 million of our term loan due December 2023 with proceeds from a term loan entered into in December 2019, thus increasing our outstanding debt at Q4 2019 period end. Amkor Technology® © 2023 Amkor Technology, Inc. 25#26Amkor Technology® Thank You © 2023 Amkor Technology, Inc. amkor.com I OX