30-Second Overview: In 1984, the mother-and-sons trio of Chang Yao-hung-ying and her real estate business crossed into semiconductor packaging and testing to found ASE. Forty years later it is the world's largest assembly and testing company, with 2024 revenue of US$10.1 billion and a near-45% global market share. Every iPhone, every laptop may use ASE's technology — it is the invisible champion that "dresses" chips and gives them "physical exams."
Why Did a Real Estate Developer Pivot to Semiconductors?
In 1983, Richard Chang, a National Taiwan University Electrical Engineering graduate with a master's degree from the Illinois Institute of Technology, was worrying about the family's real estate business. The Chang family had come to Taiwan from Wenzhou, Zhejiang; his mother, Chang Yao-hung-ying, had founded Hongching Construction, and the real estate business was going well — but Richard Chang's mind had always been fixed on the electronics industry.
That year, he hired a team of Wall Street consultants to evaluate new business investment opportunities. Over a year later, Richard Chang decided to persuade the family: to shift capital from real estate into the semiconductor packaging business.
Why packaging? Richard Chang's judgment was sharp:
- Lower technology barrier — positioned at the downstream end of the industry, with lower risk
- Labor-intensive — Philips and Texas Instruments had both set up plants in Taiwan, proving viability
- Large market space — every chip needs packaging; it is a mandatory step
On March 23, 1984, "Advanced Semiconductor Engineering, Inc." (ASE) was established in the Nanzih Export Processing Zone in Kaohsiung. Chairman Chang Yao-hung-ying (Richard Chang's mother), President Richard Chang (Richard Chang), Vice President Jason Chang (Richard Chang's younger brother) — this was a classic family business.
Starting from Zero: How Did the First Client Come?
In the early days of the business, ASE was just a small factory, primarily doing DIP (Dual Inline Package) — the most traditional technology. But Richard Chang had an advantage: his American educational background made it easier for him to access international clients.
The critical breakthrough came in 1989. ASE listed on the Taiwan Stock Exchange — the first dedicated packaging and testing company to go public in Taiwan. The capital raised through the listing gave ASE resources for expansion, and it began investing in more advanced packaging technology.
In the 1990s, with the rise of the personal computer, ASE seized the opportunity and expanded from DIP to QFP (Quad Flat Package) and BGA (Ball Grid Array). Following technology where the market led — this is the key reason ASE was able to stay ahead.
The Critical Decision: The 1998 Acquisition of Korea's K&S
In 1998, ASE made a decision that changed its fate: acquiring Korea's K&S company, formally entering the testing business.
This decision was bold. At the time, most packaging and testing companies specialized in "a single technology," but Richard Chang believed that what clients wanted was "one-stop service" — completing both packaging and testing at the same place, reducing switching costs and time.
This judgment proved correct. The integrated "packaging plus testing" service model allowed ASE to stand out from the competition, and customer satisfaction improved significantly.
The Numbers Speak: How Dominant Is the Global Leader?
2024 Global Assembly and Testing Market Rankings:
- ASE: US$10.1 billion, 45% market share
- Amkor: US$6.3 billion
- JCET: approximately US$3.0 billion
Operating scale:
- Global employees: 91,568 (2024)
- Production sites: 30 facilities in 13 countries
- Annual capacity: over 20 billion chips
- Patent count: over 15,000
Technology capability:
- Advanced packaging revenue share: 43% (including Bump/FC/WLP/SiP)
- Traditional wire bond packaging: 30%
- Downstream applications: communications 52%, automotive/consumer 30%, computing 18%
A comparison with other Taiwanese enterprises:
- TSMC: approximately 54% global wafer foundry market share
- MediaTek: approximately 37% global mobile chip share
- ASE: 45% global assembly and testing market share
All three companies are global leaders in their respective fields, forming Taiwan's semiconductor "three giants."
Why Haven't You Heard of ASE?
Clearly the global leader — why is ASE not as well-known as TSMC? The answer is its position in the supply chain.
TSMC does "wafer fabrication" — the most critical and technically demanding step in the entire semiconductor industry, which naturally attracts attention. ASE does "packaging and testing" — the downstream end of the supply chain, with a relatively lower technical barrier and less media coverage.
But this does not mean ASE is unimportant. Every chip that comes out of TSMC needs to be "processed" by a packaging and testing company like ASE:
- Packaging: Encasing the bare chip to protect it from external damage
- Testing: Checking whether every chip's functions are working correctly
- System-in-Package (SiP): Integrating multiple chips into a single module
Without ASE, your iPhone — even with the strongest chip — would not function properly.
The Invisible Champion's Global Layout
ASE's success is largely attributable to its global manufacturing network.
Asian facilities:
- Taiwan: Kaohsiung, Zhongli (R&D headquarters and high-end manufacturing)
- China: Kunshan, Shanghai, Weihai (cost-oriented manufacturing)
- South Korea: Seoul (testing technology center)
- Malaysia: Penang (first overseas facility, established 1998)
- Japan: Gunma (System-in-Package)
This layout has three major advantages:
- Proximity to clients: Wherever the client is, so is the factory
- Cost optimization: High-end technology in Taiwan, mass production in China
- Risk diversification: If one location has problems, other facilities can provide support
During the COVID-19 pandemic, when other manufacturers were shut down by lockdowns, ASE's dispersed layout demonstrated powerful resilience — orders actually increased.
Technology Innovation: From Contract Manufacturing to System Integration
ASE is not merely a "contract manufacturer" — it is also a "technology innovator."
Fan-Out Wafer-Level Packaging (Fan-Out WLP):
This is ASE's world-leading technology. Traditional packaging is like "wearing a thick overcoat"; Fan-Out packaging is like "wearing a fitted garment" — making chips thinner, smaller, and better-performing. High-end smartphones including the iPhone use this technology.
System-in-Package (SiP):
Integrating multiple chips — processors, memory, sensors — into a single module. This is the future trend, particularly for 5G, AI, and automotive electronics — all of which require this technology.
Smart manufacturing:
ASE has introduced Industry 4.0 technology, from automated production lines to AI quality inspection, comprehensively improving efficiency. This experience is also shared with Taiwan's other manufacturing industries as a reference.
New Challenges Ahead
Rising Chinese competitors:
Chinese packaging and testing companies such as JCET, Tongfu Microelectronics, and Huatian Technology are growing rapidly, with a cost advantage. ASE must maintain a technology lead to widen the gap.
Technology evolution:
The semiconductor industry is moving from "Moore's Law" into an era of "heterogeneous integration," with packaging technology becoming more complex. ASE must continuously invest in R&D to maintain its lead.
Geopolitical risks:
The US-China technology war affects global supply chains, and ASE, as a Taiwanese enterprise, must navigate a complex international situation with care.
Environmental pressure:
Tightening global environmental regulations — from lead-free processes to carbon-neutral targets — all test ASE's technology and cost control capabilities.
Why Does ASE Matter?
A critical link in Taiwan's semiconductor supply chain:
Design (MediaTek) → Manufacturing (TSMC) → Packaging and Testing (ASE) — Taiwan possesses the world's most complete semiconductor ecosystem. ASE's presence makes this ecosystem more robust.
Employment contribution:
ASE is Kaohsiung's largest private enterprise, providing tens of thousands of jobs — for engineers and operators across all skill levels.
Technology spillover effects:
ASE's technological innovation and management experience, flowing through talent mobility and supply chain collaboration, influences Taiwan's entire manufacturing sector.
Global supply chain stabilizer:
In an era of geopolitical turbulence, ASE's global layout and technological capability provide stable services to the global electronics industry.
From the family investment by Chang Yao-hung-ying and her sons in 1984 to the multinational enterprise with over 90,000 employees worldwide today, ASE demonstrates the possibility of Taiwanese enterprises winning through specialization.
In this era where everyone talks about chip design and fabrication, ASE reminds us: every link in the supply chain matters. Do one thing well, do it to the standard of world leader, and you become an indispensable invisible champion.
Further Reading:
- Taiwan Enterprise: TSMC — The twin relationship between the sacred mountain protecting the nation and the back-end packaging and testing manufacturer
- Taiwan Enterprise: MediaTek — Taiwan’s leading IC design house; together with ASE they form a complete supply-chain ecosystem
- Semiconductor Industry — 50 years of materials science from the RCA technology transfer to CoWoS advanced packaging; ASE’s position in traditional packaging
References
- Global assembly and testing Top 10 list released — ASE holds nearly 45% market share as the leading company — Business Next
- 2024 global OSAT manufacturer market size rankings Top 10 — Tencent News
- Creating the dual legend of ASE — Richard Chang and Jason Chang — CommonWealth Magazine
- ASE Semiconductor — Wikipedia
- ASE official website