ABF film supply restrictions may not harm Unimicron and could instead benefit the leader through material security and competitive barriers

Overview

The report assesses the impact on Unimicron of an ABF film supplier restricting shipments to the Mainland China market. J.P. Morgan believes the company will not only avoid a direct impact but may also benefit from priority access to materials as an industry leader and higher barriers to entry. Medium-term growth continues to be driven by an improving product mix, capacity expansion, and higher substrate content in advanced chips for AI, HPC, and other applications.

Core views

The event was triggered by a Tech News report that a leading supplier of substrate build-up film was reducing supply to the Mainland China market by 30%. The report estimated that the supplier held approximately 95% of the global market, while local alternative supply in Mainland China was very limited. Following the news, some investors became concerned about the impact on Unimicron's production in Mainland China. Its shares fell approximately 5% on Friday, while the TAIEX rose approximately 1%. Production in Mainland China accounts for slightly less than 10% of the company's ABF business, directly driving the market's concerns. Based on industry checks, J.P. Morgan concludes that Unimicron is unaffected by these restrictions because the company is permitted to allocate materials at its own discretion. The report further argues that the supply restrictions could turn from a negative event into a positive catalyst for the company. Historical experience shows that during periods of raw material tightness or shortages, leading substrate manufacturers such as Unimicron typically enjoy higher priority in material procurement. Meanwhile, rationing exports to Mainland China may constrain the development of the local substrate industry and further raise barriers for new entrants. As a result, material constraints may strengthen leading manufacturers' competitive position relative to local new entrants rather than weaken Unimicron's production capabilities. Regarding operating trends, the report reiterates that Unimicron's monthly substrate revenue will continue rising through the remainder of 2026. Subsequent growth will mainly be driven by product-mix improvements and capacity expansion, whereas revenue growth in previous months was driven more by price increases. This shift in growth drivers means that the anticipated growth will no longer depend solely on pricing but will increasingly reflect a higher share of high-value products and the ramp-up of new capacity. The long-term investment thesis is based on growing demand for ABF substrates and technological convergence. The report believes that increases in the number of substrate layers and substrate area required by HPC, AI, and 5G chips could create an opportunity for approximately 50% to 100% growth in ABF content. Technological convergence also gives the company opportunities to expand into areas such as SLP and rigid-flex PCBs. J.P. Morgan also believes that the company is becoming increasingly prudent in project execution and capital expenditure, helping it capture growth opportunities while controlling the pace of expansion. Regarding valuation, the report assigns a December 2026 target price of NT$1,225, based on a 27.5x FY27E P/E. This multiple is approximately 1.5 standard deviations above the average valuation since 2018 after excluding extreme values. The report believes that growth in key ASIC projects and the gradual ramp-up of GPU projects are sufficient to support this valuation premium. The listed share price as of August 21, 2026, was NT$1,085. The report also lists several downside risks: alternative packaging technologies such as silicon interposers and 3D ICs could significantly reduce the value added by substrates; ABF capacity expansion by Japanese and South Korean peers could exceed demand growth; macroeconomic pressure could suppress capital investment and demand from consumer electronics and enterprises; a weak smartphone outlook could weigh on SLP and BT demand; and delayed adoption of 5G millimeter-wave demand could reduce incremental contributions from the BT business.

Analysis framework

The report first identifies market concerns through the supplier restriction news and Unimicron's share-price reaction relative to the broader market, then uses industry checks to determine whether Unimicron can allocate materials independently. It subsequently draws on the procurement priority historically enjoyed by industry leaders during raw material shortages to analyze the impact of the restrictions on the competitive landscape and barriers to entry. On this basis, it assesses 2026 revenue drivers, long-term ABF content growth, and technological opportunities, before applying an FY27E P/E to determine the target price and listing the principal downside risks.

Methodology notes

• Event strategy and behavioral financeEvent-driven analysis

  Analysis of the ABF film supply restriction event

  The report begins with the supply restriction news and Unimicron's share-price reaction relative to the TAIEX, then uses industry checks to determine whether the event genuinely affects the company and analyzes the event's potential counterintuitive benefits.

• Industry/Sector analysis frameworkSupply-demand framework

  Raw material scarcity, procurement priority, and industry entry barriers

  Based on the concentrated supply of ABF film, limited alternative sources, and the history of raw material shortages, the report concludes that leading substrate manufacturers are more likely to receive priority access to materials, while supply restrictions will constrain the development of new entrants.

• Valuation methodologyPE/PEG valuation

  Target-price valuation based on FY27E P/E

  The report derives a target price of NT$1,225 using a 27.5x FY27E P/E. This multiple is approximately 1.5 standard deviations above the average since 2018 after excluding extreme values, with growth in ASIC projects and the ramp-up of GPU projects cited to justify the valuation premium.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• Unimicron (3037.TW)

  The report views the ABF film supply restrictions as a potential positive. The company can allocate materials independently and may benefit from procurement priority as an industry leader and higher barriers to entry.

  Strengths

  Priority access to materials as a leading substrate manufacturer, long-term growth in ABF demand, higher content driven by AI/HPC/5G, and increasingly prudent project execution and capital expenditure.

  Weaknesses

  Production in Mainland China accounts for slightly less than 10% of the ABF business, making the share price relatively sensitive to news about local material supply restrictions.

  Comparison

  Compared with local substrate manufacturers and new entrants in Mainland China, Unimicron is more likely to receive priority access to materials, while the supply restrictions may constrain the development of the local industry.

  Risks

  Alternative packaging technologies, excessive capacity expansion by Japanese and South Korean peers, weaker macroeconomic and end-market demand, and delays in 5G millimeter-wave demand.

Key data

• Supply reduction to the Mainland China market30%The reduction by the leading build-up film supplier cited in the Tech News report
• Leading supplier's global market share95%The estimate provided by the Tech News report, with very limited local alternative supply in Mainland China
• Unimicron share-price performanceApproximately -5%Friday's performance; the TAIEX rose approximately 1% over the same period
• Mainland China production as a proportion of the ABF businessSlightly below 10%The portion of production that the market had feared could be affected by the supply restrictions
• ABF content growth opportunityApproximately 50%-100%The opportunity arising from increases in the required layer count and substrate area for HPC, AI, and 5G chips
• Current priceNT$1,085.00August 21, 2026
• Target priceNT$1,225.00December 2026 target price
• Target valuation multipleFY27E P/E 27.5xApproximately 1.5 standard deviations above the average multiple since 2018 after excluding extreme values

Impact & implications

According to the report, the ABF film supply restrictions will not cause material shortages for Unimicron and may instead give it a relative advantage through its procurement priority as an industry leader while raising industry entry barriers by constraining the expansion of local substrate manufacturers in Mainland China. Together with an improving product mix, capacity expansion, and progress in ASIC and GPU projects, the report expects the company's monthly substrate revenue to continue growing through the remainder of 2026.

Risks

• Alternative packaging technologies such as silicon interposers and 3D ICs could significantly reduce the value added by substrates.
• ABF capacity expansion by Japanese and South Korean peers could exceed demand growth.
• Macroeconomic pressure could suppress capital investment and demand from consumer electronics and enterprises.
• A weak smartphone outlook could adversely affect SLP and BT demand.
• Delayed adoption of 5G millimeter-wave demand could reduce the incremental contribution from the BT business.