AI Revolution Fuels Substrate Bottleneck: Big Tech’s Proactive Stance
The burgeoning demand for artificial intelligence (AI) and high-performance computing (HPC) is driving unprecedented growth in the semiconductor substrate market, particularly for Ajinomoto Build-up Film (ABF) substrates. Valued at an estimated USD 2.23 billion in 2024, the ABF substrate market is projected to reach USD 3.87 billion by 2032, expanding at a CAGR of 7.14%. The broader semiconductor substrate market is expected to grow from USD 14.35 billion in 2025 to USD 31.68 billion by 2034, exhibiting a CAGR of 9.1%. This surge in demand is exacerbating critical bottlenecks in the chip supply chain, prompting major technology companies to adopt aggressive strategies, including offering advance payments and long-term contracts to substrate manufacturers to accelerate factory expansions.
ABF substrates are essential components for advanced semiconductor packaging, crucial for AI chips, server CPUs, and high-performance GPUs. However, due to the sensitive nature of substrate production and steadily increasing demand, ABF substrate shortages have persistently hampered production, with a supply-demand gap anticipated to continue until at least 2024. The semiconductor supply chain remains highly concentrated and vulnerable, particularly in advanced manufacturing and packaging capabilities located in East Asia. This structural fragility underscores why leading tech firms are making direct investments to secure stable supply.
LG Innotek’s Strategic Expansion Amidst Evolving Competition
In this dynamic market, semiconductor substrate manufacturers like LG Innotek are receiving substantial advance payments, long-term supply agreements (often with penalty provisions), and even facility investment support from major tech companies. This mirrors contract structures previously observed in the memory semiconductor industry, significantly enhancing revenue visibility and reducing profit volatility for substrate suppliers. LG Innotek’s substrate business is experiencing rapid growth, with its package solutions division’s operating profit surging 82% in 2025 and revenue increasing 18% to 1.72 trillion won. The profit contribution from this segment is projected to rise sharply from 11% in 2024 to 30% by 2026.
LG Innotek is actively expanding its production capacity. Its substrate production lines are operating at high utilization rates, exceeding 80% in 2025, and are expected to approach maximum capacity. Consequently, LG Innotek plans to double its production capacity and is establishing a new manufacturing base in Haiphong, Vietnam, with construction slated to begin in July and completion targeted for May 2027. This dual-site strategy positions its Gumi plant in South Korea as a ‘mother factory’ for high-value new model development and production, while the Haiphong facility will serve as a mass production base for general-purpose semiconductor substrates. This approach aims to enhance production efficiency and strengthen cost competitiveness. LG Innotek is aggressively targeting North American AI chip customers, planning to expand supply to Intel CPU chipsets, Amazon’s low-orbit satellite program, and humanoid robotics companies such as Boston Dynamics. Furthermore, the company is seeking to enter the supply chain for Intel’s EMIB advanced-packaging technology. LG Innotek aims to achieve over 3 trillion won (approximately $2.0 billion) in substrate revenue by 2030.
Competitors are also increasing their investments. Intel plans to invest $3.3 billion over five to six years to build a substrate manufacturing plant in Odisha, India, focusing on advanced packaging glass core substrates and high-density interconnect substrates. TSMC is reportedly exploring a shift to square glass or organic substrates with its CoPoS panel-level packaging technology, with mass production potentially commencing around 2028. SKC and its subsidiary Absolics are expected to begin commercial production of glass substrates by the end of 2026, and Samsung Electro-Mechanics is also operating a glass substrate pilot line. These developments indicate an accelerating evolution in advanced packaging technologies and diversification of substrate materials.
Future Outlook and Investment Implications
The dynamic shifts in the semiconductor substrate market offer crucial implications for investors. First, the demand for AI and HPC is not a fleeting trend but a long-term growth driver, ensuring sustained robust demand for high-performance substrates like ABF. Second, watch for supply chain diversification and vertical integration efforts. Advance payments and co-investments by major tech companies are critical strategies to secure supply chain stability, providing a solid growth foundation for substrate manufacturers. Third, closely monitor advancements in new materials and advanced packaging technologies. The commercialization of novel materials like glass substrates holds the potential to reshape market dynamics. Finally, keep a close eye on the progress of companies announcing capacity expansions. How quickly actual production capacity increases and yield rates stabilize will be a pivotal factor in determining the future supply-demand balance of the market. The substrate market is no longer just a component industry; it is a central battleground in the advanced technology race.
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