Finvest
TSM Semiconductors · Mega cap · AI hardware · Foundry · Thesis updated July 20, 2026

AI’s foundry king, with margin strain

01 Running thesis

AI demand meets costly expansion

TSMC sits near the center of the AI chip boom. Most leading AI accelerators and many high-end CPUs depend on its most advanced manufacturing lines. Management now expects overall revenue to grow about 25% per year over five years, and expects AI accelerator revenue to grow 54-56% per year.

The operating data supports the bull case. In 2025, advanced technologies at 7 nm and below made up 74% of wafer revenue. In Q2 2026, that rose to 77%. N2 entered volume production in 2025, A16 risk production is expected in 2026, and A14 volume production is planned for 2028. This keeps TSMC in the lead where customers need the most power-efficient chips.

The company is also spending at a huge scale. TSMC first set 2026 CapEx at $52-56 billion, then raised it to $60-64 billion in Q2 2026. About 70-80% of that budget is for advanced process technologies, and 10-20% is for advanced packaging, testing, mask making, and other areas. This signals strong customer demand, but it also raises the bar for future utilization.

The bear case is about returns, not relevance. TSMC is adding expensive overseas fabs, including an additional $100 billion Arizona investment for 2 nm and below technologies and advanced packaging. Management expects overseas fabs to dilute gross margin by 2-3 percentage points in early stages and 3-4 points in later stages. The new U.S. 25% ad valorem tariff on certain imported advanced computing chips, plus export rules on 16 nm and below shipments, could add more friction. Today, AI demand masks many of these costs. The key question is whether pricing and utilization stay high enough when the new capacity arrives.

Jul 2026▲Initial Finvest company page created after the 2025 Form 20-F and Q2 2026 earnings call, highlighting the faster N2 ramp, higher AI accelerator growth outlook, record margins, larger 2026 CapEx plan, and larger Arizona investment. The page also flagged overseas fab dilution, tariffs, and export controls as key long-term risks.
02 Business model

A foundry paid for precision and scale

TSMC is a pure-play foundry. That means it does not mainly sell its own branded chips. It manufactures chips designed by other companies. Customers pay TSMC to turn chip designs into wafers using advanced tools, clean rooms, process recipes, and years of manufacturing know-how.

The model works best when TSMC leads in technology and fills its fabs. Each new node costs a lot to develop and build, but high volume spreads those costs across more wafers. In 2025, 3 nm, 5 nm, and 7 nm were 24%, 36%, and 14% of wafer revenue. In Q2 2026, 2 nm, 3 nm, 5 nm, and 7 nm were 3%, 30%, 33%, and 11% of wafer revenue. This mix is why TSMC earns high margins compared with many chip companies.

AI and high-performance computing now drive the business. HPC was 51% of 2024 revenue, 60% of Q2 2025 revenue, and 66% of Q2 2026 revenue. Smartphones fell from 35% of 2024 revenue to 22% in Q2 2026 as AI-related demand grew faster. Agentic AI, where software agents make more requests and use more tokens, also increases demand for CPUs, networking chips, and accelerators. TSMC supplies many customers across those designs.

The global footprint is both a selling point and a cost risk. U.S.-made wafers can carry a price premium and may help customers reduce policy risk. But overseas fabs cost more than Taiwan fabs, and TSMC says they will dilute gross margin for years. Currency can also move margins fast. In Q2 2025, NT dollar appreciation caused a 220 basis point gross margin headwind.

03 Product portfolio

Advanced nodes feed AI demand

Growth engine

N3, the 3 nm family

N3 contributed 24% of wafer revenue in 2025 and 30% in Q2 2026. It serves high-end smartphones, AI-related processors, and other leading-edge chips.

Cash cow

N5 and N4, the 5 nm family

5 nm contributed 36% of wafer revenue in 2025 and 33% in Q2 2026. These nodes remain high-volume workhorses for CPUs, GPUs, accelerators, and flagship device chips.

Steady

N7 and older advanced nodes

7 nm was 14% of 2025 wafer revenue and 11% in Q2 2026. It supports older high-performance chips and helps TSMC balance capacity across N7, N5, and N3.

Growth engine

N2, the 2 nm platform

N2 entered volume production in 2025 and reached 3% of wafer revenue in Q2 2026. It is central to the next wave of AI accelerators and CPUs, but its steep ramp is expected to dilute second-half 2026 gross margin by about 3-4 percentage points.

Option

A16 and A14 future nodes

A16 risk production is expected in 2026. A14 development is progressing, with volume production scheduled for 2028.

Growth engine

HPC and AI accelerators

HPC reached 66% of Q2 2026 revenue. AI accelerators were about 17-19% of 2025 wafer revenue and are guided to grow at a 54-56% CAGR.

Growth engine

Advanced packaging, including CoWoS

Advanced packaging connects powerful chips with high-bandwidth memory for AI systems. TSMC plans to spend about 10-20% of 2026 CapEx on advanced packaging, testing, mask making, and related areas.

Steady

Smartphone, IoT, automotive, and consumer chips

Smartphones were 22% of Q2 2026 revenue, while IoT, automotive, and digital consumer electronics were 5%, 4%, and 1%. These areas add breadth, but they are not growing as fast as AI-driven HPC.

04 Business segments

HPC now dominates the mix

High-Performance Computing (HPC)66%growing fast
Smartphone22%declining
Internet of Things (IoT)5%modest
Automotive4%growing fast
Digital Consumer Electronics (DCE)1%flat

Platform mix uses TSMC's Q2 2026 revenue by platform disclosure. It is a quarterly mix, not a full-year mix, and it shows heavy concentration in HPC and North American demand.

05 Risk factors

What could crack the thesis

Overseas fabs dilute margins

High impact · High odds

TSMC is building expensive fabs outside Taiwan, including a larger Arizona plan tied to 2 nm and below technologies. Management expects overseas fabs to dilute gross margin by 2-3 percentage points in early stages and 3-4 points in later stages. If AI pricing weakens, these fabs could pull down returns for years.

We watchTrack quarterly gross margin, management's overseas fab dilution estimate, and any change in U.S.-made wafer pricing premiums.

Tariffs and export controls change orders

High impact · Medium odds

The U.S. imposed a 25% ad valorem tariff on certain imported advanced computing chips and derivative products unless they are for designated U.S. use. U.S. rules also expanded license needs for many products using 16 nm and below processes. Customers may shift assembly, change shipment routes, or slow orders in price-sensitive markets.

We watchWatch U.S. tariff lists, export license rules, and TSMC comments on customer behavior or order changes.

Taiwan concentration remains central

High impact · Medium odds

Most of TSMC's leading-edge scale is still in Taiwan. A military, political, power, water, or logistics shock could affect global chip supply and TSMC's revenue. Overseas fabs reduce some risk, but they will not match Taiwan's scale soon.

We watchMonitor Taiwan Strait tension, Taiwan power and water supply updates, and TSMC disclosures on capacity location.

AI demand falls short

Medium impact · Medium odds

The current case depends on very strong AI accelerator growth and rising silicon demand from agentic AI. If cloud companies slow CapEx, if model efficiency improves faster than expected, or if accelerator supply gets ahead of demand, TSMC could face lower utilization just as new 2 nm and Arizona capacity ramps.

We watchFollow hyperscaler CapEx plans, AI accelerator unit demand, and any change to TSMC's 54-56% AI accelerator CAGR outlook.

Currency and power costs hit margins

Medium impact · High odds

TSMC sells largely in U.S. dollars but has major NT dollar costs. In Q2 2025, exchange rate moves cut gross margin by about 220 basis points. Taiwan electricity costs and overseas construction inflation can add more pressure.

We watchWatch the NT dollar versus the U.S. dollar, electricity price changes in Taiwan, and TSMC's gross margin bridge.
06 Quick answers

In one breath

How does TSMC make money?

TSMC manufactures chips designed by other companies. Its best money comes from advanced nodes like 3 nm, 5 nm, and 2 nm, where customers pay for speed, power efficiency, and dependable production.

Why is TSMC important to AI?

Most leading AI accelerators and many data center CPUs depend on TSMC's advanced manufacturing. AI accelerator revenue was about 17-19% of 2025 wafer revenue, and management expects it to grow 54-56% per year.

Is TSMC still exposed to smartphones?

Yes, but smartphones are now a smaller share of the mix. Smartphones were 22% of Q2 2026 revenue, while HPC was 66%.

What should investors watch most closely?

Watch gross margin, N2 yield and ramp costs, AI accelerator demand, and the cost of overseas fabs. Also watch U.S. tariff and export control changes, because they can affect where customers want chips made and shipped.