ASE Technology Holding Co., Ltd. Reports Its Unaudited Consolidated Financial Results for the Second Quarter of 2025

ASE Technology Holding Co., Ltd. (TWSE: 3711, NYSE: ASX) (“We”, “ASEH”, or the “Company”), the leading provider of semiconductor assembly and testing services (“ATM”) and the provider of electronic manufacturing services (“EMS”), today reported its unaudited[1] net revenues of NT$150,750million for 2Q25, up by 7.5% year-over-year and up by 1.8% sequentially. Net income attributable to shareholders of the parent for the quarter totaled NT$7,521 million, down from NT$7,778 million in 2Q24 and down from NT$7,554 million in 1Q25. Basic earnings per share for the quarter were NT$1.74 (or US$0.111 per ADS), compared to NT$1.80 for 2Q24 and NT$1.75 for 1Q25. Diluted earnings per share for the quarter were NT$1.70 (or US$0.109 per ADS), compared to NT$1.75 for 2Q24 and NT$1.64 for 1Q25.

RESULTS OF OPERATIONS

2Q25 Results Highlights – Consolidated

— Net revenues from packaging operations, testing operations, EMS operations, and others represented approximately 49%, 11%, 39%, and 1% of the total net revenues for the quarter, respectively.

— Cost of revenues wasNT$125,063 million for the quarter, up from NT$123,260 million in 1Q25. – Raw material cost totaledNT$71,321 million for the quarter, representing 47% of the total net revenues. – Labor cost totaledNT$17,995 million for the quarter, representing 12% of the total net revenues. – Depreciation, amortization and rental expenses totaledNT$15,183 million for the quarter.

— Gross margin increased by 0.2 percentage points to 17.0% in 2Q25 from 16.8% in 1Q25.

— Operating margin was 6.8% in 2Q25, compared to 6.5% in 1Q25.

— In terms of non-operating items: – Net interest expense wasNT$1,203 million. – Net foreign exchange gain wasNT$11,885 million, primarily attributable to the depreciation of the U.S. dollar against the New Taiwan dollar. – Net loss on valuation of financial assets and liabilities wasNT$12,098 million. – Net gain on equity-method investments wasNT$223 million. – Other net non-operating income wasNT$255 million, primarily attributable to miscellaneous income. Total non-operating expenses for the quarter wereNT$938 million.

— Income before tax wasNT$9,255 million in 2Q25, compared to NT$9,810 million in 1Q25. We recorded income tax expenses of NT$1,576 million for the quarter, compared to NT$2,022 million in 1Q25.

— Net income attributable to shareholders of the parent wasNT$7,521 million in 2Q25, compared to NT$7,778 million in 2Q24 and NT$7,554 million in 1Q25.

— Our total number of shares outstanding at the end of the quarter was 4,422,175,232, including treasury stock owned by our subsidiaries in 2Q25. Our 2Q25 basic earnings per share ofNT$1.74 (or US$0.111 per ADS) were based on 4,332,918,727 weighted average number of shares outstanding in 2Q25. Our 2Q25 diluted earnings per share of NT$1.70 (or US$0.109 per ADS) were based on 4,395,186,708 weighted average number of shares outstanding in 2Q25.

2Q25 Results Highlights – ATM

— Net revenues were NT$92,565 million for the quarter, up by 19.0% year-over-year and up by 6.8% sequentially.

— Cost of revenues was NT$72,317 million for the quarter, up by 19.3% year-over-year and up by 7.8% sequentially. – Raw material cost totaledNT$26,338 million for the quarter, representing 29% of the total net revenues. – Labor cost totaledNT$14,606 million for the quarter, representing 16% of the total net revenues. – Depreciation, amortization and rental expenses totaledNT$13,822 million for the quarter.

— Gross margin decreased by 0.7 percentage points to 21.9% in 2Q25 from 22.6% in 1Q25.

— Operating margin was 9.5% in 2Q25, compared to 9.6% in 1Q25.

2Q25 Results Highlights – EMS

— Net revenues were NT$58,770 million, down by 6.6% year-over-year and down by 5.7% sequentially.

— Cost of revenues for the quarter was NT$53,221 million, down by 6.4% year-over-year and down by 6.2% sequentially. – Raw material cost totaledNT$45,277 million for the quarter, representing 77% of the total net revenues. – Labor cost totaledNT$3,283 million for the quarter, representing 6% of the total net revenues. – Depreciation, amortization and rental expenses totaledNT$1,110 million for the quarter.

— Gross margin increased by 0.5 percentage points to 9.4% in 2Q25 from 8.9% in 1Q25.

— Operating margin was 2.6% in both 2Q25 and 1Q25.

LIQUIDITY AND CAPITAL RESOURCES

— Equipment capital expenditures in 2Q25 totaled US$992 million, of which US$690 million was used in packaging operations, US$251 million in testing operations, US$49 million in EMS operations and US$2 million in interconnect materials operations and others.

— Total unused credit lines amounted to NT$355,299 million as of June 30, 2025.

— Current ratio was 1.02 and net debt to equity ratio was 0.52 as of June 30, 2025.

— Total number of employees was 100,450 as of June 30, 2025, compared to 96,436 as of March 31, 2025.

Business Review

Customers

ATM Basis

— Our five largest customers together accounted for approximately 43% of our total net revenues in 2Q25, compared to 44% in 1Q25. One customer accounted for more than 10% of our total net revenues in 2Q25.

— Our top 10 customers contributed 60% of our total net revenues in 2Q25, compared to 61% in 1Q25.

— Our customers that are integrated device manufacturers or IDMs accounted for 35% of our total net revenues in 2Q25, compared to 34% in 1Q25.

EMS Basis

— Our five largest customers together accounted for approximately 65% of our total net revenues in 2Q25, compared to 68% in 1Q25. One customer accounted for more than 10% of our total net revenues in 2Q25.

— Our top 10 customers contributed 71% of our total net revenues in 2Q25, compared to 74% in 1Q25.

About ASE Technology Holding Co., Ltd.

ASEH is the leading provider of semiconductor manufacturing services in assembly and test. The Company develops and offers complete turnkey solutions covering front-end engineering test, wafer probing and final test, as well as packaging, materials and electronic manufacturing services through USI with superior technologies, breakthrough innovations, and advanced development programs.With advanced technological capabilities and a global presence spanning Taiwan, China, South Korea, Japan, Singapore, Malaysia, Philippines, Vietnam, Mexico, and Tunisia as well as the United States and Europe, ASEH has established a reputation for reliable, high quality products and services.

For more information, please visit our website at https://www.aseglobal.com.

Safe Harbor Notice

This press release 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. These statements are made under the “safe harbor” provisions of the U.S. Private Securities Litigation Reform Act of 1995. 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 2024 Annual Report on Form 20-F filed on March 27, 2025.

Supplemental Financial Information (Unaudited)

Consolidated Operations

2Q25 1Q25 2Q24EBITDA[2] (NT$ million) 27,426 27,628 26,127

ATM Operations

2Q25 1Q25 2Q24Net Revenues (NT$ million) 92,565 88,668 77,813Revenues by ApplicationCommunication 46% 48% 49%Computing 24% 22% 19%Automotive, Consumer & Others 30% 30% 32%Revenues by TypeBumping, Flip Chip, WLP & SiP 47% 46% 44%Wirebonding 28% 28% 31%Others 5% 6% 7%Testing 18% 18% 16%Material 2% 2% 2%Capacity & EBITDAEquipment CapEx (US$ million) 942 869 374EBITDA[2] (NT$ million) 24,295 24,146 22,205Number of Wirebonders 25,156 25,222 25,154Number of Testers 6,797 6,686 5,676

EMS Operations

2Q25 1Q25 2Q24Net Revenues (NT$ million) 58,770 62,295 62,907Revenues by ApplicationCommunication 33% 33% 33%Computing 11% 11% 11%Consumer 30% 31% 29%Industrial 14% 13% 13%Automotive 10% 10% 11%Others 2% 2% 3%CapacityEquipment CapEx (US$ million) 49 23 31

ASE Technology Holding Co., Ltd. Summary of Consolidated Statement of Income Data (In NT$ million, except per share data) (Unaudited)

For the three months ended For the six months ended Jun. 30 Mar. 31 Jun. 30 Jun. 30 Jun. 30 2025 2025 2024 2025 2024 (Retrospectively (Retrospectively Adjusted) Adjusted)Net revenuesPackaging 73,659 68,411 62,834 142,070 122,292Testing 16,612 16,004 12,623 32,616 24,725EMS 58,374 61,860 62,853 120,234 122,179Others 2,105 1,878 1,928 3,983 3,845Total net revenues 150,750 148,153 140,238 298,903 273,041Cost of revenues (125,063) (123,260) (117,184) (248,323) (229,166)Gross profit 25,687 24,893 23,054 50,580 43,875Operating expensesResearch and development (8,004) (7,579) (7,106) (15,583) (13,715)Selling, general and administrative (7,490) (7,643) (6,939) (15,133) (13,674)Total operating expenses (15,494) (15,222) (14,045) (30,716) (27,389)Operating income 10,193 9,671 9,009 19,864 16,486Net non-operating income and expensesInterest expense – net (1,203) (1,256) (1,158) (2,459) (2,265)Foreign exchange gain (loss) – net 11,885 (1,675) (1,420) 10,210 (4,639)Gain (Loss) on valuation of financial assets (12,098) 2,873 2,664 (9,225) 6,762and liabilities – netGain on equity-method investments – net 223 40 459 263 516Others – net 255 157 551 412 1,057Total non-operating income and expenses (938) 139 1,096 (799) 1,431Income before tax 9,255 9,810 10,105 19,065 17,917Income tax expense (1,576) (2,022) (1,950) (3,598) (3,843)Income from operations and before non- 7,679 7,788 8,155 15,467 14,074controlling interestsNon-controlling interests (158) (234) (377) (392) (636)Net income attributable to shareholders of 7,521 7,554 7,778 15,075 13,438the parentPer share data:Earnings per share- Basic NT$1.74 NT$1.75 NT$1.80 NT$3.48 NT$3.11- Diluted NT$1.70 NT$1.64 NT$1.75 NT$3.34 NT$3.01Earnings per equivalent ADS- Basic US$0.111 US$0.106 US$0.112 US$0.218 US$0.196- Diluted US$0.109 US$0.100 US$0.109 US$0.209 US$0.190Number of weighted average shares used in 4,395,187 4,410,238 4,383,325 4,406,107 4,376,301diluted EPS calculation ( in thousand shares)FX (NTD/USD) 31.18 32.79 32.23 31.99 31.77

ASE Technology Holding Co., Ltd. Summary of ATM Statement of Income Data (InNT$ million) (Unaudited)

For the three months ended For the six months ended Jun. 30 Mar. 31 Jun. 30 Jun. 30 Jun. 30 2025 2025 2024 2025 2024Net revenues:Packaging 74,440 69,360 63,838 143,800 124,226Testing 16,612 16,004 12,623 32,616 24,725Direct Material 1,431 1,219 1,264 2,650 2,602Others 82 85 88 167 168Total net revenues 92,565 86,668 77,813 179,233 151,721Cost of revenues (72,317) (67,057) (60,612) (139,374) (118,963)Gross profit 20,248 19,611 17,201 39,859 32,758Operating expenses:Research and development (6,320) (6,043) (5,483) (12,363) (10,618)Selling, general and administrative (5,111) (5,233) (4,464) (10,344) (8,809)Total operating expenses (11,431) (11,276) (9,947) (22,707) (19,427)Operating income 8,817 8,335 7,254 17,152 13,331

ASE Technology Holding Co., Ltd. Summary of EMS Statement of Income Data (InNT$ million) (Unaudited)

For the three months ended For the six months ended Jun. 30 Mar. 31 Jun. 30 Jun. 30 Jun. 30 2025 2025 2024 2025 2024 (Retrospectively (Retrospectively Adjusted) Adjusted)Net revenues 58,770 62,295 62,907 121,065 122,272Cost of revenues (53,221) (56,767) (56,882) (109,988) (110,795)Gross profit 5,549 5,528 6,025 11,077 11,477Operating expensesResearch and development (1,723) (1,580) (1,668) (3,303) (3,201)Selling, general and administrative (2,313) (2,340) (2,415) (4,653) (4,724)Total operating expenses (4,036) (3,920) (4,083) (7,956) (7,925)Operating income 1,513 1,608 1,942 3,121 3,552

ASE Technology Holding Co., Ltd. Summary of Consolidated Balance Sheet Data (In NT$ million) (Unaudited)

As of Jun. 30, 2025 As of Mar. 31, 2025Current assetsCash and cash equivalents 72,785 77,100Financial assets – current 4,118 16,435Trade receivables 103,101 109,717Inventories 57,058 59,858Others 16,933 15,542Total current assets 253,995 278,652Financial assets – non-current & investments – equity -method 38,409 41,428Property, plant and equipment 364,849 342,056Right-of-use assets 11,721 11,754Intangible assets 65,610 66,955Others 30,591 33,332Total assets 765,175 774,177Current liabilitiesShort-term borrowings[3] 40,369 55,485Long-term debts – current portion 12,930 20,774Trade payables 70,518 74,382Others 125,153 117,101Total current liabilities 248,970 267,742Bonds payable 16,668 21,066Long-term borrowings[3] 162,326 126,708Other liabilities 22,276 23,638Total liabilities 450,240 439,154Equity attributable to shareholders of the parent 293,770 311,522Non-controlling interests 21,165 23,501Total liabilities & shareholders' equity 765,175 774,177Current ratio 1.02 1.04Net debt to equity ratio 0.52 0.41

ASE Technology Holding Co., Ltd. Summary of Consolidated Statement of Cash Flow Data (In NT$ million) (Unaudited)

For the three months ended For the six months ended Jun. 30 Mar. 31 Jun. 30 Jun. 30 Jun. 30 2025 2025 2024 2025 2024 (Retrospectively (Retrospectively Adjusted) Adjusted)Cash Flows from Operating Activities:Profit before income tax 9,255 9,810 10,105 19,065 17,917Depreciation & amortization 16,531 16,092 14,813 32,623 29,412Other operating activities items 11,059 (5,929) (8,132) 5,130 (13,849)Net cash generated from operating 36,845 19,973 16,786 56,818 33,480activitiesCash Flows from Investing Activities:Net payments for property, plant (43,104) (36,349) (14,786) (79,453) (27,299)and equipmentOther investment activities items (469) (1,212) 304 (1,681) (2,690)Net cash used in investing activities (43,573) (37,561) (14,482) (81,134) (29,989)Cash Flows from Financing Activities:Total net proceeds from 22,159 16,149 (12,330) 38,308 (12,470)(repayment of) borrowings andbondsOther financing activities items (662) 262 (1,093) (400) (1,126)Net cash generated from (used in) 21,497 16,411 (13,423) 37,908 (13,596)financing activitiesForeign currency exchange effect (19,084) 1,784 2,187 (17,300) 8,994Net increase (decrease) in cash and (4,315) 607 (8,932) (3,708) (1,111)cash equivalentsCash and cash equivalents at the 77,100 76,493 75,105 76,493 67,284beginning of periodCash and cash equivalents at the end 72,785 77,100 66,173 72,785 66,173of period[1] All financial information presented in this press release is unaudited, consolidated and prepared in accordance with Taiwan-IFRS (International Financial Reporting Standards as endorsed for use in the R.O.C.). Such financial information is generated internally by us and has not been subjected to the same review and scrutiny, including internal auditing procedures and audit by our independent auditors, to which we subject our year-end audited consolidated financial statements, and may vary materially from the year-end audited consolidated financial information for the same period. Any evaluation of the financial information presented in this press release should also take into account our published year-end audited consolidated financial statements and the notes to those statements. In addition, the financial information presented is not necessarily indicative of our results of operations for any future period.[2] EBITDA stands for net income or loss before interest, taxes, depreciation, amortization, impairment and investment gain or loss as well as other items.[3] Borrowings include bank loans and bills payable.

Investor Relations Contactir@aseglobal.comTel: +886.2.6636.5678https://www.aseglobal.com

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