A 5-year, $2B GlobalFoundries deal, an Intel Foveros evaluation, and three substrate alternatives - the second copy of the CoWoS map takes shape right before TSMC's Oct 15 call
Oct 10: Two Signals That Don't Agree
In the three sessions before Taiwan's 10/10 national holiday, TSMC (2330) sent two signals that pointed in opposite directions. The first was Q3 revenue of NT$1.49 trillion — a single-quarter record that broke the top end of its own guidance by +17.6% QoQ. The second, disclosed on October 8, was a five-year, $2 billion manufacturing agreement with GlobalFoundries in which GF will produce silicon interposers for TSMC's CoWoS packaging at its New York fab.
On the surface, the second story looks small. $2B is roughly 4% of what TSMC earned alone last quarter. But it is the first time since TSMC commercialized InFO in 2016 that a specific layer of the CoWoS supply chain has been handed to an outside firm — in an offshore fab, at a company whose largest shareholder is the UAE sovereign fund.
Timing is the real tell. The same week, GF Securities analyst Jeff Pu flagged that NVIDIA is evaluating Intel Foveros for the backend of its 2028 Feynman GPUs. Ahead of TSMC's October 15 earnings call, analysts put CoPoS, FOPLP, and glass substrates on the shortlist of "three technologies that will reshape the AI packaging chain." A separate technews piece hinted that TSMC is lining up another CoWoS outsourcing partner beyond GF.
CoWoS is no longer TSMC's monograph.
Why Share the Deepest Moat You Own?
The answer sits in the demand curve. TSMC's September revenue was NT$511.8B — the second consecutive month above NT$500B. Local analysts described it as "printing NT$6 million a minute." And yet shares fell 3% the day after. Foreign investors are not watching the topline beat. They are watching monthly CoWoS capacity in 2027.
Fitch Ratings was blunt in a note the same week: Taiwan AI data center buildout is now constrained by the power grid, not demand. Transmission and substation lead times trail fab ramps. Grand Cable (6213) chairman Su Wei-yuan reported record revenue and profit from the "Taipower grid expansion + TSMC AI fab wiring" double-order — a datapoint that is, paradoxically, evidence of the bottleneck.
In that context, the GF contract reads as geographic diversification insurance. When the chain is complete, an NVIDIA Blackwell/Rubin package will flow through "TSMC Taiwan Fab → GF US Interposer → TSMC Arizona Final." A delay in any one node no longer freezes the whole line. The tradeoff: TSMC migrates from "CoWoS platform" to "CoWoS brand."
Redistribution Inside Taiwan
How Taiwan's internal chain absorbs this decision is where it gets interesting. Two events overlapped during the same week.
First, Topco Scientific filed its fourth application under the "Welcome Back Investment" program, committing NT$17.9B (~US$550M) to expand its Erlin fab #4 — specialty gases and interposer substrate materials pointed at a 12-inch ramp. Even when GF makes interposers in New York, a large share of the input materials still ships from Taiwan. The interposer diaspora map reads "wafers out, materials in."
Second, Solidigm (SK Hynix's NAND brand) designated PTI (6669) and Pegatron (4938) as its Taiwan ODM partners for AI datacenter SSDs, with orders potentially reaching ~$3B/year. Taiwan OSAT and ODM capacity is being redirected toward the "NAND side" of AI memory. As CoWoS leaves Taiwan, Taiwan packaging rebalances into memory and SSD.
The Pre-Holiday Sell
But the market is not in celebration mode. Ahead of the 10/10 holiday, foreign investors net-sold for a third straight session, with Thursday alone totaling NT$75.9B (~US$2.3B). Top sell names: AUO, Foxconn (2317), and TSMC itself. Per cnyes, capital rotated into memory, PCB, and passive components.
Why passives? Phison printed a +370% YoY September revenue line. PSMC (6770) printed +94% YoY. Ronghui-KY printed +141× YoY on AI liquid-cooling CDUs. The "controller + PMIC + passives" stack behind SSD and HBM is expanding faster than CoWoS allocation can accommodate. When CoWoS outsourcing cannot clear the backlog in time, the market bets on the memory chain instead.
What October 15 Decides
Everything converges on one message from TSMC's October 15 call: the A14 ramp schedule, the Musk Terafab partnership status, 2027 CoWoS capacity numbers, and most of all — is the GF deal a temporary spillover, or a structural re-architecture? Foreign brokers have already raised their TSMC target to a record NT$4,410. But that target presumes CoWoS is no longer solely Taiwan's problem to solve.
Position Summary
TSMC (2330) heads into its earnings call with the unusual pairing of a record revenue print and a 3% share price decline. The central question is the geographic distribution of CoWoS capacity in 2027. If GF and Intel Foveros each take defined roles, TSMC trades some pricing power for externalized grid and capacity risk. Inside Taiwan, redistribution favors Topco Scientific (materials), PTI/Pegatron (NAND SSD ODM), and Grand Cable (power). The market has not yet repriced for this transition — and October 15 is where that repricing starts.
Key Sources: - GlobalFoundries Signs $2B Deal with TSMC to Build U.S. CoWoS Interposer Supply Chain (technews, 2026-10-08) - NVIDIA Said to Evaluate Intel Foveros Packaging for 2028 GPUs, Testing TSMC's CoWoS Moat (cnyes, 2026-10-10) - TSMC Earnings Preview: CoPoS, FOPLP and Glass Substrates Set to Reshape AI Packaging Chain (technews, 2026-10-09) - Fitch: Taiwan Power Grid Emerges as Binding Constraint for AI Data Center Buildout (cnyes, 2026-10-09) - Foreign Funds Sell NT$75.9B of TW Equities Pre-Holiday; AUO, Foxconn, TSMC Top Dumps (cnyes, 2026-10-08) - plus 55 more
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