Ajinomoto, Nittobo, Ibiden and AT&S sit in an ABF substrate supply chain consolidated into near-monopolies, where the AI chip bottleneck keeps moving. Nvidia, Intel and AMD are prepaying for suppliers' factories, with Ibiden receiving over 90 billion yen; companies that size do not prepay unless out of options. Ajinomoto holds over 95% of the substrate film market, and Apple, Nvidia and Google are chasing Nittobo's glass fabric. A capex cycle ending in overcapacity is the risk. x.com  x.com 

Unimicron should benefit from a persistent AI ABF substrate shortage and a shift toward higher-end products. Its projected share exceeds 30% as the market reaches $13bn/$18bn in 2027/28; added capacity is expected to lift ABF revenue 66%/90%. Higher-end ABF, mSAP and LPDDR lift margins, supporting 77% EPS CAGR. Initiate Buy with a NT$1,820 target at 30x 2027 earnings. x.com 

Nittobo and Ajinomoto are unlikely to deliver alpha because they will not monetize their monopoly pricing power, putting customer relationships ahead of shareholders. SK hynix and Micron raise prices when demand exceeds supply and reinvest profits to widen their technology lead; per @jukan05, Nittobo has no intention of raising prices. In fast-moving chips, customer loyalty does not merit a high valuation premium, even with Ajinomoto holding 95% of ABF film and no qualified Chinese rival yet. … Show more

Austria Technologie & Systemtechnik (AT&S) is a bullish pick. x.com 

AT&S's re-rating is underway, but the market has not priced what its Kulim plant becomes at scale; it is preferable to Japanese substrate makers Ibiden, Shinko and Toppan. The Kulim ramp drove an 18% sequential revenue jump, AMD is the anchor customer, more AI and HPC clients have joined, and five major customers are targeted by fiscal 2027. Free cash flow has turned positive at €223M. With Chongqing serving China and Kulim the West, AT&S collects tolls on both sides of the geopolitical divide. … Show more

Ibiden seems the cleaner quality long among ABF substrate makers, with tighter customer ties to Intel and Nvidia and better ABF process IP. It offers less upside optionality, but its earnings quality looks the highest. @zephyr_z9 names Ibiden and Unimicron as the best buys, citing lower consumer exposure than Kinsus and Nan Ya. x.com 

IC substrates are Schmid's more relevant growth driver today because demand is already high and rising. Schmid customers Ibiden and Unimicron are expanding capacity with NVIDIA support; higher order intake supports the prospect of more equipment orders. Its balance sheet has improved, and the risk/reward looks attractive at current levels despite volatility. Glass substrates may take another one to two years to matter commercially. This is a personal assessment, not a buy recommendation. x.com  … Show more

AT&S's valuation looks too low relative to some peers given its Intel and AMD revenue exposure; ChatGPT-generated estimates of that exposure may prove too low for FY28. x.com  x.com 

Ibiden stands to benefit from a tight substrate supply chain that is pushing customers to prepay. Intel CEO Lip-Bu Tan told CNBC that a couple of customers have prepaid for substrates because supply is very tight and he must put up money to secure material, which shows commitment. Intel also uses AT&S for substrates, but Ibiden is its main supplier. x.com  x.com 

AMD and Nvidia face a growing capital burden from substrates without the benefit of foundry margin stacking. Each is committing $1 billion to the substrate ecosystem; AMD has also publicly committed $10 billion to its Taiwan supply chain, more than three times its Q2 net income. That capital is unavailable for R&D and product development, while their gross margins are flat or shrinking. Intel's gross margin is growing as customers prepay its foundry for substrates. x.com