To The Moon

TSMC Arizona Posts First Positive Equity-Method Contribution: What's Driving It and What Could Derail It

What happened

$Taiwan Semiconductor Manufacturing(TSM)$  quietly crossed a milestone in Q2: its Arizona subsidiary showed a positive 'share of profits of investee' in the company's consolidated filing. By contrast, JASM (Kumamoto) remained in the red, underscoring a faster profitability turn in the U.S. asset than in Japan at this stage of ramp.

By the numbers

~Node mix: In Q2, 5-nanometer technologies contributed 36% of wafer revenue; N4/N4P/N4X are classified by TSMC as part of the 5-nanometer family, so Arizona's N4 output is inside that bucket.

~Arizona status: U.S. Commerce said 4-nm production in Phoenix began in early 2025. Initial monthly capacity plans were ~20k wpm, with multiple industry reports and trade press pointing to a ramp toward ~30k wpm as Phase-1 matures.

Why Arizona turned the corner

~Utilization + yields + customer mix. AI/HPC demand remains the growth engine; management highlighted stronger N3 and N5 shipments and specifically noted that overseas fab dilution was partially offset by higher capacity utilization and cost improvements in Q2. That's the classic recipe for an equity-method swing from loss to profit during a new-fab ramp.

~Government support. On top of up to US$6.6B in proposed CHIPS Act direct funding (plus up to US$5B in loans and eligibility for a 25% ITC), TSMC booked NT$67.1B in government grant cash inflows in 1H25—help that defrays start-up costs and accelerates breakeven.

How the product map lines up with N4

Arizona's Phase-1 runs N4, a member of the 5-nm family:

~$Apple (AAPL.US)$ : A16 Bionic（iPhone 14 Pro / iPhone 15/15 Plus）and S9 SiP（Apple Watch Series 9/Ultra 2) are built on TSMC N4P. This is a natural anchor workload for early N4 capacity.

~$NVIDIA (NVDA.US)$ : Hopper H100/H200 and Ada Lovelace GPUs use TSMC 4N, a custom variant in the N4 family co-developed with TSMC. Blackwell (B200/GB200) on TSMC 4NP; Nvidia says Blackwell chips have started production at TSMC's Phoenix fabs.

~$Advanced Micro Devices (AMD.US)$ : EPYC (5th-Gen 'Turin') standard CCDs on TSMC N4 (Arizona-aligned); Ryzen 9000 CCDs also on N4; AI lines are not N4—MI300/MI325 use 5nm XCD + 6nm IOD, while MI350/MI355 move to N3P XCD + N6 IOD.

The wild card: U.S. tariffs

In mid-August, the White House teased semiconductor import tariffs potentially as high as 200%–300%, while also hinting at exemptions for firms manufacturing in the U.S. Details remain sparse. For TSMC, U.S. production should help, but any rules around country-of-origin, back-end steps, or mixed supply chains could still inject uncertainty for customers and pricing.

Bottom line for investors:

Q2 marks a credible profitability inflection for Arizona on an equity-method basis and a relative lead over JASM's ramp. The drivers look two-handed—real demand/operational progress plus policy support. The wild card is tariff design: exemptions could blunt the hit, but until final rules are published, cross-border flows and customer allocation plans remain in flux.

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