ASE Tech 2025-26: ATM +20%, AI Server Cycle Drives Leading-Edge
FY25 (TWD) revenue NT$648.9B (+8%); Op income NT$51.0B (+24%); NI NT$40.9B (+23%); EPS NT$18.46. ATM (assembly + test + materials) revenue +20%; LEAP services NT$1.6B / 13% of ATM revenue. Testing business +36%. EMS revenue -5% / margin compressed. Q1 FY26: revenue -5-7% QoQ; ATM GM 24-25%. Leading-edge revenue to at least double FY26 vs FY25.
Key takeaways
- AI server cycle the structural growth narrative. ATM (assembly + test + materials) revenue +20% in FY25 with LEAP services hitting NT$1.6B (~13% of ATM revenue). Testing business +36% YoY on AI workload demand. ASE is one of the few non-TSMC plays directly leveraged to the AI build-out.
- Q1 FY26 sequential decline expected. Revenue -5% to -7% QoQ; ATM revenue -low to mid-single-digit QoQ; ATM gross margin 24-25%. Seasonality + customer ramp-down patterns. EMS similar to Q1 FY25.
- Leading-edge revenue at least 2x in FY26. This is the cleanest mgmt forward signal — leading-edge packaging (CoWoS-like 2.5D + 3D advanced packaging for AI accelerators) doubling reflects continued hyperscaler demand + ASE positioning vs TSMC.
- EMS slowdown drag on consolidated. EMS (electronics manufacturing services) revenue -5% FY25 with margin compressed to 9.1%. Mainstream + auto + general electronics softness offsetting AI.
- FY26 ATM gross margin structural range hold. Mgmt expects pricing environment favorable + structural margin expansion. EMS Q1 similar to Q1 2025.
Business
ASE Technology Holding is the world's largest semiconductor assembly + test + materials (ATM) company plus electronics manufacturing services (EMS):
- Assembly + Test + Materials (ATM) (~67% of revenue): Wirebonding + flip-chip + system-in-package + 2.5D/3D advanced packaging + wafer test + final test. Customers: AMD, Marvell, Broadcom, NXP, Texas Instruments, MediaTek, custom AI ASIC makers. AI cycle benefit through advanced packaging.
- Electronics Manufacturing Services (EMS) (~33% of revenue): Contract manufacturing for consumer electronics + auto + comm + industrial. Lower margin (9% range) than ATM. SOX, USI brand operations.
LEAP (Leading-Edge Advanced Packaging) services: ASE's CoWoS-equivalent 2.5D advanced packaging line. NT$1.6B in FY25 (13% of ATM revenue) — the AI cycle's most direct beneficiary at ASE.
Geographic / customer mix:
- US customers (~40%): AMD, Marvell, Broadcom, NXP, MediaTek, custom ASIC makers
- China + Taiwan customers (~40%): Local Asian semis customers
- Other (~20%)
FY25 financial performance (TWD)
| Metric (FY) | 2023 | 2024 | 2025 |
|---|---|---|---|
| Revenue (NT$B) | 574.18 | 607.72 | 648.92 |
| Gross profit (NT$B) | 85.73 | 93.49 | 114.82 |
| Gross margin | 14.9% | 15.4% | 17.7% |
| Op income (NT$B) | 40.87 | 41.08 | 51.03 |
| Op margin | 7.1% | 6.8% | 7.9% |
| EBITDA (NT$B) | 103.37 | 108.53 | 118.84 |
| Net income (NT$B) | 31.30 | 33.15 | 40.88 |
| Diluted EPS (NT$) | 14.36 | 14.46 | 18.46 |
| FCF (NT$B) | 51.09 | 2.97 | -20.01 |
| Capex (NT$B) | -53.47 | -81.77 | -163.04 |
| Total debt (NT$B) | 179.22 | 201.41 | 264.10 |
| Dividends (NT$B) | -37.34 | -22.92 | -23.16 |
The earnings print: Revenue +8%, GM +230bp to 17.7%, op margin +110bp to 7.9%. EPS +28% to NT$18.46. Strong operating leverage on ATM + LEAP services growth.
Capex stepped to NT$163B (+99% YoY) — massive build-out of advanced packaging capacity for AI workloads. Total debt jumped to NT$264B (+$63B YoY) funding capex. FCF turned negative on heavy capex.
Capital allocation
- Capex: -NT$163B FY25 (25% of revenue) — extreme capital intensity for advanced packaging buildout.
- Dividends: -NT$23.2B FY25 (in line with FY24).
- Buybacks: zero.
- Debt: NT$264B (+NT$63B YoY) funding capex expansion.
FY26 outlook (per Q4 FY25 call, 2026-02-05)
| FY26 framework | Direction |
|---|---|
| Q1 FY26 revenue | -5% to -7% QoQ |
| Q1 ATM revenue | -low to mid-single-digit QoQ |
| Q1 ATM gross margin | 24-25% |
| Q1 EMS revenue + margin | Similar to Q1 FY25 |
| Full-year 2026 leading-edge revenue | At least 2x vs FY25 |
| ATM gross margin (full year) | Structural range hold |
| Total ATM utilization | ~80% |
Implicit: full year FY26 revenue + EBITDA growth driven by leading-edge doubling + AI cycle continuation. Capex remains elevated to support capacity.
Key risks
- Customer concentration in AI: Doubling of leading-edge revenue depends on AMD + Marvell + custom ASIC + hyperscaler demand. Any pullback compresses.
- Capex cycle execution: Massive capex investments must hit utilization targets to justify.
- TSMC competition: TSMC's CoWoS dominant in advanced packaging; ASE catching share but TSMC scaling fast.
- Macro / mainstream: EMS + mainstream ATM exposed to consumer + auto + industrial cycles.
- FX: TWD/USD exposure; revenue mostly USD billed but reported TWD.
- Geopolitical: US-China tech restrictions could affect Chinese customer access.
Bottom line
ASX FY25 is the AI advanced packaging build-out year. Revenue +8%, GM +230bp, Op margin +110bp, EPS +28%. ATM +20% with LEAP +13% of ATM revenue. Capex jumped 99% to NT$163B preparing for FY26 doubling of leading-edge. Q1 FY26 sequential dip then recovery; FY26 leading-edge at least 2x. The thesis is unique direct AI advanced packaging exposure + customer base + scale advantages over smaller competitors. Risks are AI cycle dependency + capex execution + TSMC competition.
Citations
- ASE Technology Holding (ASX) FY25 Annual Report (filed early 2026, Taiwan FSC + SEC 20-F).
- ASX Q4 FY25 earnings call, 2026-02-05 — ATM 2025 +20% revenue, LEAP NT$1.6B (13% of ATM), Testing +36%; FY26 Q1 (-5-7% QoQ revenue, ATM GM 24-25%, EMS similar to Q1 FY25); leading-edge revenue at least 2x in FY26; ATM utilization ~80%; favorable pricing environment for ATM profitability.
- Internal financial_statements view (consolidated annual + cash flow + capex; reflects TWD reporting).