AI memory lifts Lam, China still matters
- Lam makes etch and deposition tools, which shape tiny layers on silicon wafers during chip production.
- In the March 2026 quarter, Memory rose to 39% of systems revenue as DRAM demand strengthened.
- Management now expects 2026 WFE of $140 billion with upside, meaning more spending on chip factory equipment.
- China was still 34% of total revenue, so export rules remain the biggest swing factor.
- The price matters: Finn's valuation view is only middle of the road even as performance and balance sheet scores are stronger.
AI spending is pulling Lam forward
Lam is one of the main toolmakers behind advanced chips. Its tools help chip companies cut and build the very small structures inside a wafer. That makes Lam tied to the capital spending plans of memory, foundry, and logic chipmakers.
The bull case got stronger in the March 2026 quarter. Management lifted its 2026 WFE outlook to $140 billion with upside. WFE means wafer fabrication equipment, or the machines used inside chip factories. Lam also said a roughly $40 billion NAND upgrade cycle is being pulled forward, with most spending expected before the end of 2027.
The mix is moving in Lam's favor. Memory rose to 39% of systems revenue from 34% in the prior quarter, helped by record DRAM revenue. DRAM is the memory type used in high bandwidth memory for AI systems. Customer support revenue also hit a record $2.1 billion plus quarter, giving Lam a steadier base than tool sales alone.
The bear case is not gone. China was still 34% of total revenue in the March 2026 quarter. That is lower than recent peaks, but still large enough that tighter U.S. export controls could hurt. The stock also needs customers to keep spending at high levels. If AI chip demand cools, the WFE and NAND upgrade story could fade.
Tools first, service for staying power
Lam mainly earns money by selling wafer fabrication tools. These machines are used by chipmakers to etch patterns into wafers and deposit new materials onto them. Each new chip process can need new steps, which gives Lam chances to sell more tools or win share.
The company is strongest in etch and deposition. These steps matter more as chips add more layers, use gate-all-around designs, move power delivery to the back side of the chip, and pack chips together in advanced packages.
Lam also has the Customer Support Business Group, or CSBG. This group sells spares, upgrades, services, and Reliant refurbished systems for mature chip nodes. That installed base can make revenue less jumpy than new tool orders, though it still depends on chip factory usage and customer budgets.
The weak point is customer spending cycles. Lam does well when chipmakers build or upgrade fabs. It can slow fast when customers pause projects, when export rules block shipments, or when the memory market cuts capital spending.
Where Lam wins process steps
Conductor Etch
Lam's conductor etch tools help cut key patterns in chip structures. DIRECTDRIVE technology is aimed at future 4F2 DRAM and sub-2 nanometer nodes, where tighter plasma control matters.
Dielectric Etch
Lam Cryo 3.0 uses cryogenic etch to control deep channel holes in NAND memory. That matters as NAND stacks add more layers.
Deposition
Lam sells PECVD-based pure carbon and gap fill processes. These can replace older polysilicon and tungsten steps in multi-tier NAND, helping customers cut process steps.
Advanced Packaging
SABRE 3D copper plating supports 2.5D and 3D chip packaging. This is tied to demand for AI systems that connect many chips close together.
Customer Support Business Group
CSBG sells spares, upgrades, services, and Reliant systems for mature nodes. It reached a record $2.1 billion plus quarter and helps smooth the business.
Memory is gaining share
Segment mix is based on systems revenue for the quarter ended March 29, 2026. Geography is still concentrated, with China at 34% of total revenue even as Korea and Taiwan rose to 23% each.
What could break the thesis
Tighter China export controls
High impact · Medium oddsChina was 34% of total revenue in the March 2026 quarter. Lam expects that share to decline, but any new U.S. rule that blocks more tool sales could hit revenue and customer plans.
AI spending reversal
High impact · Medium oddsThe stronger thesis depends on chipmakers keeping capital spending high. Management raised 2026 WFE to $140 billion with upside, helped by demand across device types. If AI server demand weakens, foundry, DRAM, and NAND orders could slow.
NAND upgrade timing slips
Medium impact · Medium oddsLam sees roughly $40 billion of NAND conversion spending, with most now expected before the end of 2027. That pull-forward is a key catalyst. If memory customers delay upgrades, Lam may still win the business, but later than investors expect.
Middle East supply shock
Medium impact · Medium oddsLam disclosed a new risk tied to conflict in the Middle East. The filing says regional disruption has affected supply and prices for energy and industrial commodities used by the semiconductor industry. Higher input costs or logistics problems could pressure margins.
Margin targets reset too low
Medium impact · Low oddsManagement is outperforming its old long-term model and plans to update targets later in the year. That could help the stock if targets move up. It could hurt if the new margin goals do not match investor hopes.
In one breath
What does Lam Research actually make?
Lam makes chipmaking equipment used inside semiconductor fabs. Its main tools etch tiny patterns into wafers and deposit thin layers of material during chip production.
Why is AI important for Lam Research?
AI demand is pushing chipmakers to spend more on advanced logic and high bandwidth memory. Lam benefits because those chips need complex etch, deposition, and packaging steps.
Why is China a risk for Lam Research?
China was 34% of Lam's total revenue in the March 2026 quarter. U.S. export rules can limit what Lam is allowed to ship there, which can reduce revenue even when demand is strong.
What is WFE and why does it matter?
WFE means wafer fabrication equipment. It is the total market for machines used to make chips, so a higher WFE outlook usually means a larger demand pool for Lam.