30-Second Overview: In 1984, Chang Yao-ying and her two sons, originally from the construction industry, pivoted into semiconductor packaging and testing to found ASE (Advanced Semiconductor Engineering). Forty years later, it has become the world's largest OSAT (Outsourced Semiconductor Assembly and Test) provider, with 2024 revenues reaching $10.1 billion USD and a global market share of nearly 45%. Every iPhone and laptop likely utilizes ASE's technology—it is the "invisible champion" that provides chips with their "clothing" and "physical exams."
Why did a construction company owner pivot to semiconductors?
In 1983, Chang Chien-sheng—a graduate of National Taiwan University's Department of Electrical Engineering with a Master's from the Illinois Institute of Technology in the US—was preoccupied with managing his family's real estate business. The Chang family migrated to Taiwan from Wenzhou, Zhejiang; his mother, Chang Yao-ying, had established Hongjing Construction, which was performing well, but Chang Chien-sheng remained captivated by the electronics industry.
That year, he hired a group of Wall Street consultants to evaluate new investment opportunities. Over a year later, Chang Chien-sheng decided to persuade his family: move capital from real estate into the semiconductor packaging industry.
Why packaging? Chang's judgment was precise:
- Lower technical barriers — Positioned downstream in the industry, it carried lower risk.
- Labor intensive — At the time, Philips and Texas Instruments were setting up plants in Taiwan, proving the model's viability.
- Large market potential — Every chip requires packaging; it is an essential process.
On March 23, 1984, "ASE Group" was established in the Nanzih Industrial Park in Kaohsiheng. The leadership included Chairman Chang Yao-ying (Chang Chien-sheng's mother), General Manager Chang Chien-sheng, and Vice President Chang Hung-pen (Chang Chien-sheng's brother)—a classic family enterprise.
Starting from Zero: How did the first customer arrive?
In its early days, ASE was merely a small factory primarily utilizing DIP (Dual In-line Package), one of the most traditional technologies. However, Chang Chien-sheng had an advantage: his educational background in the US made it easier for him to connect with international clients.
A critical turning point occurred in 1989 when ASE went public on the Taiwan Stock Exchange, becoming the first specialized packaging and testing company in Taiwan to list. The IPO provided the capital necessary for expansion, allowing the company to invest in more advanced packaging technologies.
With the rise of the personal computer in the 1990s, ASE seized the opportunity, expanding from DIP to QFP (Quad Flat Package) and BGA (Ball Grid Array). Aligning technology with market trends was the key to ASE's leadership.
A Key Decision: The 1998 Acquisition of Korea's K&S
In 1998, ASE made a fate-changing decision: the acquisition of the Korean K&S company, officially entering the testing business.
This was a bold move. At the time, most OSAT providers specialized in a single technology, but Chang Chien-sheng believed customers wanted "one-stop service"—completing everything from packaging to testing within a single company to reduce transition costs and time.
The judgment proved correct. The integrated "packaging + testing" service model allowed ASE to stand out in the competition, significantly increasing customer satisfaction.
By the Numbers: How powerful is the global leader?
2024 Global OSAT Market Rankings:
- ASE Group: $10.1 billion USD, 45% market share
- Amkor: $6.3 billion USD
- JCET: Approximately $3 billion USD
Operational Scale:
- Global employees: 91,568 (as of 2024)
- Production sites: 30 facilities across 13 countries
- Annual capacity: Over 20 billion chips
- Number of patents: Over 15,000
Technical Capabilities:
- Advanced packaging revenue share: 43% (including Bump, FC, WLP, and SiP)
- Traditional wire bonding: 30%
- Downstream applications: Communications 52%, Automotive/Consumer 30%, Computing 18%
Comparison with other Taiwanese enterprises:
- TSMC: Global foundry market share approx. 54%
- MediaTek: Global mobile chip market share approx. 37%
- ASE Group: Global OSAT market share 45%
All three companies are global leaders in their respective fields, forming the "Big Three" of Taiwan's semiconductor industry.
Why haven't you heard of ASE?
Despite being number one globally, why is ASE not as famous as TSMC? The answer lies in its position in the industry chain.
TSMC performs "wafer fabrication," which is the most critical and technologically demanding stage of the entire semiconductor industry, naturally attracting more attention. ASE performs "packaging and testing," which is downstream in the supply chain; because the technical barriers are relatively lower compared to fabrication, it receives less media coverage.
However, this does not mean ASE is unimportant. Every chip that emerges from TSMC must undergo "processing" at OSAT providers like ASE:
- Packaging: Enclosing the bare die to protect it from external damage.
- Testing: Checking whether each chip functions correctly.
- System-in-Package (SiP): Integrating multiple chips into a single module.
Without ASE, even if your iPhone has the most powerful chip, it would be unable to function properly.
The Global Layout of an Invisible Champion
ASE's success stems largely from its global manufacturing network.
Asian Hubs:
- Taiwan: Kaohsiung, Zhongli (R&D Headquarters + High-end Manufacturing)
- China: Kunshan, Shanghai, Weihai (Cost-oriented Manufacturing)
- South Korea: Seoul (Testing Technology Center)
- Malaysia: Penang (The first overseas plant, established in 1998)
- Japan: Gunma (System-in-Package)
This layout offers three major advantages:
- Proximity to Service: Factories are located wherever the customers are.
- Cost Optimization: High-end technology is maintained in Taiwan, while mass production occurs in China.
- Risk Diversification: If one site faces issues, other facilities can provide support.
During the COVID-19 pandemic, when other manufacturers faced shutdowns due to lockdowns, ASE's distributed layout demonstrated immense resilience, and orders actually increased.
Technological Innovation: From OEM to System Integration
ASE is not just an "OEM"; it is a "technological innovator."
Fan-Out Wafer Level Packaging (Fan-Out WLP):
This is a technology where ASE leads the world. While traditional packaging is like wearing a "thick coat," Fan-Out WLP is like wearing "compression gear," making chips thinner, smaller, and more efficient. High-end smartphones like the iPhone utilize this technology.
System-in-Package (SiP):
Integrating processors, memory, and sensors into a single module. This is the future trend, especially for 5 $\text{G}$, AI, and automotive electronics.
Smart Manufacturing:
ASE has introduced Industry 4.0 technologies, ranging from automated production lines to AI-driven quality inspection, comprehensively improving efficiency. These experiences are also exported as references for other Taiwanese manufacturing sectors.
New Challenges Ahead
The Rise of Chinese Competitors:
Chinese OSAT providers such as JCET, TFME, and Huatian Technology are growing rapidly and possess cost advantages. ASE must widen the gap through technological leadership.
Technological Evolution:
As semiconductors move from "Moore's Law" into the era of "Heterogeneous Integration," packaging technology is becoming more complex. ASE must continue to invest in R&D to maintain its lead.
Geopolitical Risks:
The US-China tech war affects global supply chains. As a Taiwanese enterprise, ASE must navigate complex international dynamics with caution.
Environmental Pressure:
Global environmental regulations are tightening. From lead-free processes to carbon neutrality goals, ASE's technical and cost-control capabilities are being tested.
Why is ASE important?
A critical link in Taiwan's semiconductor supply chain:
Design (MediaTek) $\rightarrow$ Manufacturing (TSMC) $\rightarrow$ Packaging & Testing (ASE). Taiwan possesses the world's most complete semiconductor ecosystem, and ASE's presence makes this ecosystem more robust.
Contribution to Employment:
ASE is the largest private enterprise in Kaohsiung, providing tens of thousands of jobs across various skill levels, from engineers to operators.
Technological Spillover Effect:
Through talent mobility and supply chain collaboration, ASE's technological innovation and management expertise influence the entire Taiwanese manufacturing industry.
Stabilizer of the Global Supply Chain:
In an era of geopolitical volatility, ASE's global footprint and technical capabilities provide stable services for the global electronics industry.
From a family investment by Chang Yao-ying and her sons in 1984 to today's multinational corporation with over 90,000 employees, ASE has proven the possibility of Taiwanese enterprises achieving "specialized victory."
In an era where everyone discusses chip design and manufacturing, ASE reminds us: every link in the industry chain is vital. By mastering one thing and becoming number one in the world, you become an irreplaceable, invisible champion.
Further Reading:
- Taiwanese Enterprises: TSMC — The symbiotic relationship between the "Protector of the Nation" and downstream OSATs
- Taiwanese Enterprises: MediaTek — Taiwan's leader in IC design, part of the same complete supply chain ecosystem as ASE
- Semiconductor Industry — From RCA technology transfer to CoWoS advanced packaging: 50 years of the materials science battlefield and ASE's position in traditional packaging