TL;DR · 30-second read

The Short Version

A Taiwanese company that does the final steps of making memory chips just had its best three months ever. It wraps finished chips in protective casing and checks that they work. Sales were up about 37% from a year earlier.

The reason is artificial intelligence. AI systems are using up memory chips faster than the world can make them. Memory chips are the parts that let a computer hold information while it works.

The company is adding factory space, but says that space is already promised to existing customers. So there is little room left over for anyone else, even in the less famous steps of chipmaking.

ChipMOS Technologies, a Taiwan-based provider of outsourced semiconductor assembly and test services (OSAT), reported record unaudited revenue of NT$8,400.8 million (US$263.8 million) for the third quarter of 2026 on October 8, 2026. That was up 13.8% from the second quarter and 36.7% from the third quarter of 2025. September revenue was NT$2,792.0 million (US$87.7 million), up 0.2% from August and 33.8% from September 2025.

In a 6-K filed with the SEC the same day, the company attributed the growth to sustained AI-related demand outpacing available memory supply. It said new capacity from its continuing footprint expansion is being deployed to meet existing customer forecasts and long-term supply agreements.

Executive Summary

ChipMOS packages and tests chips, much of it memory. That is the back-end work that turns finished silicon into parts a server or phone maker can use. Its record quarter is the latest sign that AI demand is pulling on the whole memory supply chain, not only the companies that fabricate the chips.

The most consequential line in the release is not the 36.7% growth. It is the statement that new capacity is going to existing customer forecasts and long-term supply agreements, while structural supply constraints persist. In plain terms, the expansion ChipMOS is paying for has largely been claimed before it comes online. For hardware buyers, that means the back end of memory production offers little spare room in which a shortage could ease quickly.

The company also said demand is broadening across most of its memory and storage end markets. That suggests AI’s pull on memory supply is spilling into conventional devices. The disclosure covers revenue only, however. Margins, pricing and the scale of the expansion are not yet public.

New Capacity That Is Already Spoken For

Chipmaking has two broad halves. The front end prints circuits onto silicon wafers. The back end cuts those wafers into individual chips, encases them in protective packages and tests each one before it ships. A memory chip that has been fabricated but not yet packaged and tested cannot go into a server. Back-end throughput is therefore as much a ceiling on usable supply as wafer output. ChipMOS sits in that back-end layer as an outsourced provider, serving fabless chip designers, integrated device manufacturers and foundries.

ChipMOS says AI-related demand is outpacing available memory supply. It also says new capacity is being deployed to meet existing customer forecasts and long-term supply agreements. That combination is the operational signal. When a supplier says its expansion is already committed, the extra capacity does not show up as open slots that a new or occasional buyer can book. Customers with forecasts on file and contracts in place get the increment first. Everyone else competes for whatever remains.

Memory makers’ customers feel this first. Downstream, so does anyone whose AI server or storage plans depend on memory arriving on schedule. ChipMOS describes the constraints as structural, not temporary. That language implies the company does not expect the imbalance to resolve within a quarter or two. It has not, however, said how long it expects the constraints to last.

A Step Up in July, Then a Plateau

The quarterly and monthly figures together show how the growth arrived. Third-quarter revenue of NT$8,400.8 million, minus August’s NT$2,785.7 million and September’s NT$2,792.0 million, implies July revenue of about NT$2,823.1 million. That makes July the strongest month of the three. August and September held almost exactly level, and September was up just 0.2% month on month.

So the jump from the second quarter’s NT$7,383.1 million came as a step change at the start of the quarter, which then held at roughly NT$2.8 billion a month. Year-on-year growth stayed above 33% in both August and September. The higher level is sustained, but it did not keep climbing within the quarter. A flat run rate at a record level fits a business working through committed volume as fast as its lines allow. It could equally reflect order timing or product mix. ChipMOS has not said which.

AI Demand Spilling Into Conventional Memory

The release says demand is broadening across most of the company’s memory and storage end markets. That matters for understanding where AI’s pull ends up. When AI servers absorb a large share of available memory supply, buyers of memory for other products face tighter supply too. Back-end providers serving those markets then see demand from several directions at once. ChipMOS’s growth is consistent with that pattern, though the company has not broken out revenue by end market.

The market has been paying attention. In a 6-K filed September 29, ChipMOS reported that trading in its securities had reached a Taiwan Stock Exchange disclosure threshold. Under exchange rules, that required the company to publish a notice pointing investors to its financial information.

What the Revenue Figures Do and Do Not Establish

Memory is historically one of the most cyclical corners of the semiconductor industry. The release’s mention of long-term supply agreements is relevant because such contracts can smooth volumes through a downturn. Without disclosed terms, though, their protective value is hard to judge. The company’s forward-looking statements also flag tariffs, trade-policy changes, exchange rates and recession risk as factors that could change results.

The figures are unaudited consolidated revenue. All US-dollar amounts, including those for prior periods, are translated at a single September 30, 2026 rate of NT$31.85 to the dollar. The growth rates therefore reflect New Taiwan dollar performance, not currency movements. Revenue also says nothing on its own about profitability. A record top line built on constrained supply could carry strong margins. It could also carry elevated costs from the expansion under way. ChipMOS’s quarterly earnings report will show which.

Background

ChipMOS Technologies is headquartered in Hsinchu Science Park, Taiwan, and operates facilities in Hsinchu Science Park, Hsinchu Industrial Park and Southern Taiwan Science Park. It is dual-listed on the Taiwan Stock Exchange (8150) and Nasdaq (IMOS). It provides end-to-end assembly and test services to fabless chip designers, integrated device manufacturers and independent foundries across a wide range of end markets, with memory and storage a significant part of its business.

Semiconductor production splits into front-end fabrication, where circuits are built on silicon wafers, and back-end assembly and test, where chips are separated, packaged and verified. Much of the attention on AI hardware has focused on leading-edge fabrication. But every chip, including the memory that AI servers consume in large quantities, must also pass through back-end lines before it can ship. That makes outsourced assembly and test providers an often-overlooked link in AI infrastructure supply.

Sources

Source: ChipMOS REPORTS RECORD HIGH QUARTERLY REVENUE; 33.8% YoY INCREASE IN SEPTEMBER 2026 REVENUE; 36.7% YoY INCREASE IN 3Q26 REVENUE, ChipMOS’s October 8, 2026 announcement of unaudited September and third-quarter revenue.

Primary sources: ChipMOS Technologies Form 6-K filed October 8, 2026 (September 2026 and 3Q26 revenue); ChipMOS Technologies Form 6-K filed September 29, 2026 (TWSE trading-threshold financial disclosure).