ASX ASE Technology Holding Co Ltd

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

1 ASE Technology Holding Co., Ltd. February 10, 2022 ASE Technology Holding Fourth Quarter 2021 Earnings Release

2 Safe Harbor Notice This presentation contains "forward - looking statements" within the meaning of Section 27A of the United States Securities Act of 1933, as amended, and Section 21E of the United States Securities Exchange Act of 1934, as amended. Although these forward - looking statements, which may include statements regarding our future results of operations, financial condition or business prospects, are based on our own information and information from other sources we believe to be reliable, you should not place undue reliance on these forward - looking statements, which apply only as of the date of this press release. The words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “plan” and similar expressions, as they relate to us, are intended to identify these forward - looking statements in this press release. These forward - looking statements are necessarily estimates reflecting the best judgment of our senior management and our actual results of operations, financial condition or business prospects may differ materially from those expressed or implied by the forward - looking statements for reasons including, among others, risks associated with cyclicality and market conditions in the semiconductor or electronic industry; changes in our regulatory environment, including our ability to comply with new or stricter environmental regulations and to resolve environmental liabilities; demand for the outsourced semiconductor packaging, testing and electronic manufacturing services we offer and for such outsourced services generally; the highly competitive semiconductor or manufacturing industry we are involved in; our ability to introduce new technologies in order to remain competitive; international business activities; our business strategy; our future expansion plans and capital expenditures; the strained relationship between the Republic of China and the People’s Republic of China; general economic and political conditions; the recent shift in United States trade policies; possible disruptions in commercial activities caused by natural or human - induced disasters; fluctuations in foreign currency exchange rates; and other factors. For a discussion of these risks and other factors, please see the documents we file from time to time with the Securities and Exchange Commission, including the 2020 Annual Report on Form 20 - F filed on April 6, 2021.

3 Consolidated Statements of Comprehensive Income Quarterly Comparison (unaudited) (NT$ Million) Q4 / 2021 % Q3 / 2021 % Q4 / 2020 % QoQ YoY Net Revenues: ATM 90,583 52.4% 88,791 58.9% 69,135 46.4% 2% 31% EMS 81,541 47.2% 61,116 40.6% 79,141 53.2% 33% 3% Others 812 0.4% 758 0.5% 601 0.4% 7% 35% Total Net Revenues 172,936 100.0% 150,665 100.0% 148,877 100.0% 15% 16% Gross Profit 32,894 19.0% 30,784 20.4% 23,299 15.6% 7% 41% Operating Income (Loss) 19,615 11.3% 18,426 12.2% 11,246 7.6% 6% 74% Pretax Income (Loss) 37,336 21.6% 18,474 12.3% 12,604 8.5% 102% 196% Income Tax Benefit (Expense) (5,592) -3.2% (3,630) -2.4% (1,839) -1.2% Non-controlling Interest (828) -0.5% (668) -0.4% (721) -0.5% Net Income Attributable to Shareholders of the Parent 30,916 17.9% 14,176 9.4% 10,044 6.7% 118% 208% Basic EPS 7.20 3.29 2.35 119% 206% Diluted EPS 6.99 3.20 2.30 118% 204% Additional Commentary From Management 1&2 : Gross Profit excl. PPA expenses 33,819 19.6% 31,716 20.3% 24,184 16.2% 7% 40% Operating Profit excl. PPA expenses 20,802 12.0% 19,620 11.3% 12,383 8.3% 6% 68% Net Profit excl. PPA expenses 32,105 18.6% 15,374 9.1% 11,239 7.5% 109% 186% Basic EPS excl. PPA expenses 7.48 3.56 2.63 110% 184% 1 : PPA expenses are the P&L impacts from the accounting treatment of purchase price allocation in relation to the ASE/SPIL trans act ion, which resulted in increased asset values from purchase price premiums in PP&E, intangibles and right - of - use assets. The PPA exp enses excluded are related to depreciation, amortization and other expenses $ 1.14bn in 4Q21, $1.15bn in 3Q21 and $1.20bn in 4Q20. 2 : PPA expenses are the P&L impacts from the accounting treatment of purchase price allocation in relation to the USI/ Asteelflash transaction, which resulted in increased asset and liability values from purchase price premiums in PP&E , intangibles, right - of - use assets and deferred tax liability. The PPA expenses excluded are related to depreciation , amortization , other expenses, income tax benefit and non - controlling interest $ 0.07bn in 4Q21 and $ 0.06bn in 3Q21.

4 Consolidated Statements of Comprehensive Income Yearly Comparison (unaudited) (NT$ Million) FY / 2021 % FY / 2020 % YoYNet Revenues: ATM 327,718 57.5% 270,095 56.6% 21% EMS 239,488 42.0% 204,691 42.9% 17% Others 2,791 0.5% 2,192 0.5% 27% Total Net Revenues 569,997 100.0% 476,978 100.0% 20% Gross Profit 110,369 19.4% 77,984 16.3% 42% Operating Income (Loss) 62,125 10.9% 34,877 7.3% 78% Pretax Income (Loss) 80,336 14.1% 35,734 7.5% 125% Income Tax Benefit (Expense) (14,322) -2.5% (6,457) -1.4% Non-controlling Interest (2,106) -0.4% (1,684) -0.4% Net Income Attributable to Shareholders of the Parent 63,908 11.2% 27,593 5.8% 132% Basic EPS 14.84 6.47 129% Diluted EPS 14.40 6.31 128% Additional Commentary From Management 1&2 : Gross Profit excl. PPA expenses 114,184 20.0% 81,692 17.1% 40% Operating Profit excl. PPA expenses 66,996 11.8% 39,597 8.3% 69% Net Profit excl. PPA expenses 68,734 12.1% 32,414 6.8% 112% Basic EPS excl. PPA expenses 15.96 7.60 110% 1 : PPA expenses are the P&L impacts from the accounting treatment of purchase price allocation in relation to the ASE/SPIL trans act ion, which resulted in increased asset values from purchase price premiums in PP&E, intangibles and right - of - use assets. The PPA exp enses excluded are related to depreciation, amortization and other expenses $4.61bn in 2021 and $4.82bn in 2020 . 2 : PPA expenses are the P&L impacts from the accounting treatment of purchase price allocation in relation to the USI/ Asteelflash transaction, which resulted in increased asset and liability values from purchase price premiums in PP&E, intangibles, right - of - use assets and deferred tax liability. The PPA expenses excluded are related to depreciation, amortization, other expenses, income tax bene fit non - controlling interest $ 0.30bn in 2021.

5 ATM Statements of Comprehensive Income Quarterly Comparison (unaudited) (NT$ Million) Q4 / 2021 % Q3 / 2021 % Q4 / 2020 % QoQ YoYNet Revenues: Packaging 76,664 83.4% 75,221 83.5% 60,825 83.6% 2% 26% Testing 13,756 15.0% 13,416 14.9% 10,667 14.7% 3% 29% Direct Material 1,502 1.6% 1,429 1.6% 1,229 1.7% 5% 22% Others 36 0.0% 26 0.0% 31 0.0% 38% 16% Total Net Revenues 91,958 100.0% 90,092 100.0% 72,752 100.0% 2% 26% Gross Profit 25,741 28.0% 24,714 27.4% 16,478 22.6% 4% 56% Operating Income (Loss) 16,056 17.5% 15,631 17.3% 8,002 11.0% 3% 101% Additional Commentary From Management 1 : Gross Profit excl. PPA expenses 26,620 28.9% 25,594 28.4% 17,363 23.9% 4% 53% Operating Profit excl. PPA expenses 17,185 18.7% 16,761 18.6% 9,139 12.6% 3% 88% 1 : PPA expenses are the P&L impacts from the accounting treatment of purchase price allocation in relation to the ASE/SPIL transaction, which resulted in increased asset values from purchase price premiums in PP&E, intangibles and right - of - use assets. The PPA expenses excluded are related to depreciation and amortization $1.13bn in both 4Q21 and 3Q21 and $1.14bn in 4Q20.

6 ATM Statements of Comprehensive Income Yearly Comparison (unaudited) (NT$ Million) FY / 2021 % FY / 2020 % YoYNet Revenues: Packaging 279,365 83.4% 228,574 81.5% 22% Testing 49,981 14.9% 47,277 16.9% 6% Direct Material 5,346 1.6% 4,314 1.5% 24% Others 113 0.1% 132 0.1% -14% Total Net Revenues 334,805 100.0% 280,297 100.0% 19% Gross Profit 88,672 26.5% 59,434 21.2% 49% Operating Income (Loss) 53,432 16.0% 27,609 9.8% 94% Additional Commentary From Management 1 : Gross Profit excl. PPA expenses 92,194 27.5% 63,142 22.5% 46% Operating Profit excl. PPA expenses 57,958 17.3% 32,329 11.5% 79% 1 : PPA expenses are the P&L impacts from the accounting treatment of purchase price allocation in relation to the ASE/SPIL transaction, which resulted in increased asset values from purchase price premiums in PP&E, intangibles and right - of - use assets. The PPA expenses excluded are related to depreciation and amortization $4.53bn in 2021 and $4.72bn in 2020.

7 ATM Operations (unaudited) 13,334 15,082 14,540 16,478 18,007 20,210 24,714 25,741 66,209 69,516 71,820 72,752 73,767 78,988 90,092 91,958 20.1% 21.7% 20.2% 22.6% 24.4% 25.6% 27.4% 28.0% 0% 10% 20% 30% 40% 0 20,000 40,000 60,000 80,000 100,000 Q1/20 Q2/20 Q3/20 Q4/20 Q1/21 Q2/21 Q3/21 Q4/21 NT$ Million Gross Profit Gross Margin Revenue

8 ATM Revenue by Application (unaudited) 54% 54% 53% 52% 50% 50% 51% 50% 15% 14% 14% 14% 14% 14% 15% 16% 31% 32% 33% 34% 36% 36% 34% 34% 0% 20% 40% 60% 80% 100% Q1/20 Q2/20 Q3/20 Q4/20 Q1/21 Q2/21 Q3/21 Q4/21 Communication Computing Automotive, Consumer & Others

9 38% 38% 37% 35% 34% 33% 36% 38% 36% 35% 37% 39% 40% 42% 39% 37% 7% 7% 8% 9% 9% 8% 8% 8% 17% 18% 17% 15% 15% 15% 15% 15% 2% 2% 1% 2% 2% 2% 2% 2% 0% 20% 40% 60% 80% 100% Q1/20 Q2/20 Q3/20 Q4/20 Q1/21 Q2/21 Q3/21 Q4/21 Material Testing Discrete and Other Wirebonding Bump/FC/WLP /SiP ATM Revenue by Type (unaudited)

10 EMS Operations Quarterly/Yearly Comparison (unaudited ) (NT$ Million) Q4 / 2021* % Q3 / 2021* % Q4 / 2020 % QoQ YoY EMS Net Revenues 81,544 100.0% 61,127 100.0% 79,149 100.0% 33% 3% Gross Profit 7,108 8.7% 5,883 9.6% 6,996 8.8% 21% 2% Operating Income (Loss) 3,599 4.4% 2,658 4.3% 3,463 4.4% 35% 4% (NT$ Million) FY / 2021* % FY / 2020 % YoY EMS Net Revenues 239,519 100.0% 204,723 100.0% 17% Gross Profit 21,479 9.0% 18,921 9.2% 14% Operating Income (Loss) 8,706 3.6% 7,802 3.8% 12% *: PPA expenses are the P&L impacts from the accounting treatment of purchase price allocation in relation to the USI/ Asteelflash transaction, which resulted in increased asset and liability values from purchase price premiums in PP&E, intangibles, right - of - use assets and deferred tax liability. The PPA expenses excluded are related to depreciation and amortization $0.06bn in 4Q21 and 3Q21 and $ 0.35bn in 2021.

11 EMS Operations Revenue By Application (unaudited ) 36% 46% 40% 45% 39% 39% 38% 38% 14% 12% 6% 4% 7% 10% 10% 8% 33% 28% 40% 39% 33% 28% 33% 38% 11% 10% 9% 8% 14% 16% 12% 11% 6% 3% 4% 3% 5% 5% 5% 4% 1% 1% 1% 2% 2% 2% 1% 0% 20% 40% 60% 80% 100% Q1/20 Q2/20 Q3/20 Q4/20 Q1/21 Q2/21 Q3/21 Q4/21 Communication Computing Consumer Industrial Automotive Others

12 Key Balance Sheet Items & Indices (unaudited) (NT$ Million) Dec. 31, 2021 Sept. 30, 2021 Cash and cash equivalent 76,073 53,419 Financial assets - current 3,075 4,133 Financial assets - non current & investments - equity method 23,260 20,915 Property, plant & equipment 239,867 252,384 Total assets 672,934 650,259 Short-term loans 41,037 36,610 Current portion of bonds payable 9,903 3,699 Current portion of long-term loans 4,526 2,840 Bonds payable 42,365 48,498 Long-term loans & long-term bills payable 121,946 137,015 Total interest bearing debts 227,176 235,326 Total liabilities 398,301 399,420 Total equity (Including non-controlling interest) 274,633 250,839 Quarterly EBITDA 51,938 32,655 Current ratio 1.39 1.35 Net debt to equity ratio 0.54 0.71

13 Equipment Capital Expenditure vs. EBITDA (unaudited) 410 495 415 379 471 611 468 472 635 751 788 908 879 976 1,175 1,871 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 Q1/20 Q2/20 Q3/20 Q4/20 Q1/21 Q2/21 Q3/21 Q4/21 US$ Million Capex EBITDA China site disposals: US$625M 1,246

14 2021 Recap • 2021 revenues and margin improvement better than target • 2021 ATM revenues grew 26% year over year (all in USD terms), or 45% year over year excluding EAR - affected business • 2021 ATM GM was 26.5%, approaching historical peak levels of 27% • 2021 ASE consolidated revenues grew 26% year over year • 2021 ASE consolidated operating margin improved 3.6 percentage points year over year versus target of 2.5 - 3 percentage points • Broad based growth with momentum • 2021 Wirebond revenues grew 36% year over year, expecting double digit growth in 2022 • Even with EAR impact, 2021 Test revenues grew 12% year over year, expecting the growth rate to double in 2022 • 2021 Advanced Packaging revenues grew 23% year over year, expecting stronger growth rate in 2022 • 2021 ATM automotive revenues grew over 60% year over year, momentum to continue in 2022, expecting to achieve $1B revenues milestone Note: All numbers indicated are in USD terms. 2021 numbers are on a reported basis; 2022 numbers and forward - looking comments are stated on a pro forma basis, which excludes the 4 disposed China sites from year 2021.

15 2022 Outlook (1/2) • Revenues and margin improvement to continue in 2022 • Demands indicating a strong 2022 with another better - than - seasonal 1Q22, followed by quarter - to - quarter growth • Expect logic semiconductor industry to grow 5 - 10% year over year • Expect 2022 ATM revenues year over year growth to be 2x of the logic semiconductor industry driven by market share gain and IDM outsourcing • Expec t a stable pricing environment, higher mix of testing and advanced packaging business • Expanding SiP customer portfolio with n ew SiP customers revenues to surpass half a billion mark in 2022 • 2022 ATM gross and operating margin should surpass historical peak levels set in 2014 (27.0%/16.6%). Consolidated operating margin to further improve versus 2021 Note: All numbers indicated are in USD terms. 2022 numbers and forward - looking comments are stated on a pro forma basis, which excludes the 4 disposed China sites from year 2021.

16 2022 Outlook (2/2) • Solid outlook for year 2022 and years beyond • Capacity and supply constraint will last beyond 2023 • Scale, technology leadership, flexibility and proven record make ASE an indispensable manufacturing partner • Customer long term service agreements in place through 2023 • IDM outsourcing ratio accelerating • Healthy growth of HPC, automotive, 5G migration, IoT and expanding silicon content leading to robust end demand and optimistic long - term prospects • A new round of smart factory, building and infrastructure investment started in 2021 aiming at supporting customers’ long - term demand

17 China Site Disposals • Deal closed on December 16, 2021 • Total consideration: US$1.46 billion • The disposed sites accounted for 7.6 % of ATM revenues and 4.5% of consolidated revenues • The disposed sites generated around NT$0.79 of basic EPS in 2021 • Resource realignment to f ocus on the mega site (SPIL Suzhou) to address China opportunity • More cash resources for organic expansion and strategic investments

18 First Quarter 2022 Outlook* Based on our current business outlook and exchange rate assumptions, management projects overall performance for the first quarter of 2022 to be as follows: • On a pro forma basis, in US dollar terms, our ATM 1 st quarter 2022 business will be impacted by 4% versus 4 th quarter 2021 levels due to lower working days and SiP seasonality; • On a pro forma basis, our ATM 1 st quarter 2022 gross margin should be slightly higher than our 2 nd quarter 2021 gross margin; • In US dollar terms, our EMS 1st quarter 2022 business level should be similar with the quarterly average of full year 2021; • Our EMS 1st quarter 2022 operating margin should be close to the average of 2nd and 3rd quarter 2021 operating margin. *: Due to the impact of the COVID - 19 outbreak, our outlook continues to be subject to a higher degree of risk. The information provided is done so as a reference of our current view as of the date of this presentation. Our business, financial condition an d results of operations are of greater adverse risk; and, as a result, there may be a higher likelihood of material variances b etw een our expected and actual results .

19 www.aseglobal.com Thank You

20 Appendix 1 Consolidated Statements of Comprehensive Income Pro Forma Basis (unaudited) (NT$ Million) Q1/2021 % Q2/2021 % Q3/2021 % Q4/2021 % FY/2021 % Net Revenues: ATM 65,557 57.6% 70,919 58.8% 82,019 57.0% 83,805 50.4% 302,300 55.5% EMS 47,684 41.9% 49,147 40.7% 61,116 42.5% 81,541 49.1% 239,488 44.0% Others 602 0.5% 619 0.5% 758 0.5% 812 0.5% 2,791 0.5% Total Net Revenues 113,843 100.0% 120,685 100.0% 143,893 100.0% 166,158 100.0% 544,579 100.0% Gross Profit 20,868 18.3% 23,470 19.4% 29,251 20.3% 31,454 18.9% 105,043 19.3% Operating Income (Loss) 10,405 9.1% 12,394 10.3% 17,463 12.1% 18,765 11.3% 59,027 10.8% Pretax Income (Loss) 10,625 9.3% 12,440 10.3% 17,429 12.1% 36,320 21.9% 76,814 14.1% Income Tax Benefit (Expense) (2,392) -2.1% (2,543) -2.1% (3,505) -2.4% (5,767) -3.5% (14,207) -2.6% Non-controlling Interest (252) -0.2% (358) -0.3% (668) -0.5% (828) -0.5% (2,106) -0.4% Net Income Attributable to Shareholders of the Parent 7,981 7.0% 9,539 7.9% 13,256 9.2% 29,725 17.9% 60,501 11.1% Basic EPS 1.85 2.21 3.07 6.92 14.05 Diluted EPS 1.80 2.12 2.99 6.72 13.62 FX (NTD/USD) 28.30 28.03 27.79 27.78 27.98 *: Pro forma basis excludes the 4 disposed China Sites.

21 Appendix 2 ATM Statements of Comprehensive Income Pro Forma Basis (unaudited) (NT$ Million) Q1/2021 % Q2/2021 % Q3/2021 % Q4/2021 % FY/2021 % Net Revenues: Packaging 56,844 83.4% 60,716 83.5% 69,512 83.4% 70,942 83.3% 258,014 83.4% Testing 10,204 15.0% 10,656 14.6% 12,354 14.8% 12,700 14.9% 45,914 14.9% Direct Material 1,044 1.5% 1,372 1.9% 1,429 1.7% 1,502 1.8% 5,347 1.7% Others 47 0.1% 3 0.0% 26 0.0% 36 0.0% 112 0.0% Total Net Revenues 68,139 100.0% 72,747 100.0% 83,321 100.0% 85,180 100.0% 309,387 100.0% Gross Profit 16,989 24.9% 18,876 25.9% 23,181 27.8% 24,301 28.5% 83,346 26.9% Operating Income (Loss) 9,415 13.8% 11,048 15.2% 14,667 17.6% 15,205 17.9% 50,334 16.3% FX (NTD/USD) 28.30 28.03 27.79 27.78 27.98 *: Pro forma basis excludes the 4 disposed China Sites.

22 Appendix 3 Consolidated Statements of Comprehensive Income ( unaudited) (NT$ Thousand) Q1/2021 Q2/2021 Q3/2021 Q4/2021 FY/2021 Revenues 119,469,784 126,926,346 150,664,816 172,936,186 569,997,132 COGS 97,583,415 102,122,197 119,880,851 140,041,892 459,628,355 PPA under COGS 1,024,525 933,946 931,880 925,188 3,815,539 Gross profit 21,886,369 24,804,149 30,783,965 32,894,294 110,368,777 Gross profit excl. PPA 22,910,894 25,738,095 31,715,845 33,819,482 114,184,316 OPEX 10,977,703 11,630,191 12,357,669 13,278,865 48,244,428 PPA under OPEX 269,154 263,543 262,097 261,699 1,056,493 Operating income 10,908,666 13,173,958 18,426,296 19,615,429 62,124,349 Operating income excl. PPA 12,202,345 14,371,447 19,620,273 20,802,316 66,996,381 Non Op gain/(loss) 271,633 170,726 48,235 17,720,464 18,211,058 PPA under Non Op gain/ (loss) 43,225 2,813 39,929 40,799 126,766 Non Op gain/ (loss) excl. PPA 314,858 173,539 88,164 17,761,263 18,337,824 Pretax income 11,180,299 13,344,684 18,474,530 37,335,892 80,335,405 PPA under Pretax income 1,336,904 1,200,302 1,233,906 1,227,686 4,998,798 Pretax income excl. PPA 12,517,203 14,544,986 19,708,436 38,563,578 85,334,203 Tax expenses 2,451,096 2,648,128 3,630,545 5,592,057 14,321,826 PPA under Tax expense (38,471) (16,250) (20,612) (21,430) (96,773) Tax expense excl. PPA 2,489,567 2,664,378 3,651,157 5,613,487 14,418,599 Non-controlling interest 252,076 358,136 667,705 827,984 2,105,901 PPA under Non-controlling interest 30,714 12,788 15,661 16,695 75,858 Non-controlling interest excl. PPA 282,790 370,924 683,366 844,679 2,181,759 Net income attributable to shareholders of the parent 8,477,127 10,338,420 14,176,280 30,915,851 63,907,678 PPA expenses under Net income attributable to shareholders of the 1,267,719 1,171,264 1,197,633 1,189,561 4,826,167 Net income attributable to shareholders of the parent excl. PPA 9,744,846 11,509,684 15,373,913 32,105,412 68,733,845 Total PPA expenses 1,298,433 1,184,052 1,213,294 1,206,256 4,902,025 Basic EPS (NT$) 1.97 2.40 3.29 7.20 14.84 Basic EPS (NT$) excl. PPA 2.26 2.67 3.56 7.48 15.96 Diluted EPS (NT$) 1.92 2.30 3.20 6.99 14.40 Diluted EPS (NT$) excl. PPA 2.21 2.57 3.47 7.27 15.50