Snapshot

Semiconductor inspection and metrology tools find defects and measure critical dimensions on chips during manufacturing. At 3nm and below, a single misplaced particle or a feature off by fractions of a nanometer can kill a die worth thousands of dollars. The three US-listed pure-play companies in this sub-sector are KLA Corporation (KLAC), the dominant player with ~$12.2B in FY2025 revenue; Onto Innovation (ONTO), a $987M-revenue (FY2024) specialist in lithography metrology and advanced packaging; and Camtek (CAMT), an Israel-based $429M-revenue (FY2024) company focused on 2D/3D inspection for advanced packaging, HBM, and bumping. Applied Materials and ASML also participate in this market but are not pure-play inspection/metrology.

Foundries allocate 15-20% of capital expenditure to process control equipment est.. Global WFE spending was $104.3B in 2024 and is forecast at $110.8B in 2025 and $122.1B in 2026. KLA's share of WFE has risen from ~6% in 2021-22 to ~8% in 2025, ahead of its own 7.25% long-term target, driven by AI chip complexity and advanced packaging. The sub-sector earns 55-63% gross margins.

The product & how money is made

Inspection tools scan wafer surfaces to detect killer defects — particles, pattern anomalies, scratches — using optical imaging (brightfield and darkfield) or electron beams. Metrology tools measure physical dimensions: film thickness, overlay alignment between layers, critical feature widths, and 3D bump heights in advanced packaging. Together these are called "process control" — the quality gate at every manufacturing step.

Why it matters in cash terms

A single NVIDIA Blackwell GPU die is large and expensive. An undetected defect destroys it. On a wafer that yields only two usable dies, one defect drops yield from 100% to 50%. On a wafer with ten smaller dies, the same defect drops yield to only 90%. AI chips are among the largest dies ever manufactured, making each defect proportionally more costly. Foundries spend more on process control as chip complexity rises because the payback in saved defective chips exceeds the tool cost.

Revenue model

• Tool sales (systems): Individual inspection or metrology tools cost $2M-$50M+ depending on capability. These are capital equipment sold to foundries (TSMC, Samsung, Intel), memory makers (SK Hynix, Micron), and IDMs. Revenue is lumpy and tied to fab construction cycles.
• Services & subscriptions: KLA's services business is growing double-digits, with 75% contract-based recurring revenue. Installed base of ~18,000 KLA tools generates ongoing service fees, spare parts, and software. Onto and Camtek have smaller but growing service streams.
• Advanced packaging (fastest-growing): KLA's advanced packaging revenue was ~$500M in 2024 and is guided to ~$925M in 2025 — roughly 85% year-over-year growth. This segment inspects HBM stacks, CoWoS interposers, 3D bump interconnects, and chiplet assemblies. Camtek's primary growth driver is also advanced packaging for AI/HPC.

Sources: KLA FY2025 earnings release (Aug 2025); KLA Goldman Sachs conference (Sep 2025); Onto Innovation Q4/FY2024 earnings (Feb 2025); Camtek FY2024 earnings (Feb 2025).

Demand

Demand already contracted or delivered

• WFE spending set record after record: SEMI reports global WFE reached $104.3B in 2024. Foundry/logic was the largest segment. contracted
• KLA booked $12.2B in FY2025 (ended Jun 2025), up 24% from $9.8B in FY2024. Semiconductor process control (the core) was $10.9B of that, up 25%. Q4 FY2025 alone was $3.2B, a record. contracted
• Onto delivered seven consecutive quarters of revenue growth through Q1 2025 ($266.6M, +17% YoY). AI packaging revenue grew 180% in FY2024 over FY2023. Advanced nodes revenue doubled quarter-over-quarter in Q1 2025. contracted
• Camtek posted $118.6M in Q1 2025, a record, up 22% YoY. CEO identified HBM3e-to-HBM4 transition as the next growth driver. Two new products (Eagle G5, Hawk) launched. contracted

Demand forecast

• SEMI forecasts WFE at $110.8B in 2025 (+6.2%) and $122.1B in 2026 (+10.2%). Upward revision from $107.6B, driven by increased sales to foundry and memory applications. est.
• Process control's share of WFE is rising. KLA estimates it went from ~6% in 2021-22 to ~8% in 2025. Three forces: larger dies (fewer chips per wafer, each defect costlier), HBM stacking complexity (base dies moving from 7nm to 3nm, compounding inspection per layer), and advanced packaging now resembling front-end manufacturing in complexity. est.
• Advanced packaging equipment is a $10-11B market growing fast enough that KLA says it may need to be analyzed separately from traditional WFE. KLA alone expects to capture $925M of it in FY2025. est.
• The semiconductor inspection & metrology market overall is estimated at ~$13B in 2025, growing to ~$17B by 2030 (5.4% CAGR). The sub-3nm node segment is the fastest at 9.25% CAGR. Computing/data centers end-use is growing at 7.1% CAGR. est.
• TSMC's N2 (2nm) node could be the largest node ever in its first three years, with ~15 customers engaged, roughly 10 in HPC. Each new node generation requires new or upgraded inspection/metrology tools. est.

Sources: SEMI mid-year forecast (2025); Mordor Intelligence semiconductor metrology & inspection report (2025); KLA Goldman Sachs conference (Sep 2025); company earnings releases.

Supply

Who makes the tools and how much

• KLA is the dominant supplier with ~50-60% share of wafer inspection, ~40-50% of metrology, and ~80%+ of reticle (photomask) inspection est.. Installed base: ~18,000 tools globally.
• Onto Innovation specializes in overlay metrology, lithography metrology (Iris film tool), and 3D bump/packaging inspection. Zero debt. Manufacturing in the US.
• Camtek specializes in 2D/3D inspection for bumps, HBM, fan-out packaging. Headquarters and manufacturing in Israel, with some European operations. Most sales are in Asia.
• Other suppliers include Applied Materials (e-beam review and defect analysis), Hitachi (CD-SEM), Lasertec (EUV mask inspection), and Nova Ltd (NVMI, optical metrology).

Capacity and bottlenecks

• Inspection/metrology tools are not the binding bottleneck in the semiconductor supply chain — that distinction belongs to EUV lithography (ASML) and CoWoS advanced packaging (TSMC). Process control tools have shorter lead times and can be ramped more incrementally.
• The constraint is intellectual, not physical. Building a competitive wafer inspection platform takes decades of accumulated know-how in optics, sensors, algorithms, and defect libraries. KLA's ROIC has averaged above 35% over five years est.. Switching costs are high because fabs calibrate entire manufacturing flows around specific inspection recipes.
• Tariff exposure is modest. KLA manufactures primarily in the US and Israel. Camtek noted "no material impact" from tariffs, with manufacturing in Israel and Europe. Onto is US-based. China was the largest equipment destination in 2024 ($49.5B) but is expected to decline under export restrictions.

Sources: KLA Goldman Sachs conference (Sep 2025); Camtek Q1 2025 earnings (May 2025); SEMI mid-year forecast (2025); Mordor Intelligence report.

The gap

Process control demand is structurally rising as a share of total fab spending. The open variable is whether the rate of intensity increase continues at the current pace.

TAM math note: KLA's semiconductor process control segment revenue ($10.9B) exceeds the 8%-of-WFE figure (~$8.9B) because KLA's revenue includes tools sold for advanced packaging that may not be counted in traditional WFE definitions, plus services revenue on installed base. The inspection/metrology market including advanced packaging and services is larger than the narrow WFE-based estimate.

Sources: SEMI WFE data; KLA FY2025 10-K; KLA Goldman Sachs conference; Mordor Intelligence; company earnings releases.

The players

KLA is 19x the revenue of Camtek and 12x the revenue of Onto. It returned $3.1B to shareholders in FY2025 ($2.15B buybacks + $905M dividends). Its 39% operating margin is the highest in the group. It carries $5.9B of long-term debt against $4.5B of cash (~$1.4B net debt) on $3.7B FCF.

Onto is debt-free with $851M cash. Its forward P/E (~29x) is the lowest of the three on 21% revenue growth and expanding margins. AI packaging revenue grew 180% in FY2024.

Camtek has the highest revenue growth rate (36% FY2024) and is the most direct advanced-packaging play. It carries ~$488M of debt against $523M cash. Its trailing P/E (~191x) reflects share-based compensation adjustments; the forward P/E (~41x) better reflects analyst consensus.

Sources: KLA FY2025 10-K (Aug 2025); Onto Innovation FY2024 10-K and Q1 2025 earnings; Camtek FY2024 and Q1 2025 earnings; yfinance market data Jun 2 2026.

The price of exposure

Per $100 invested (trailing):

• KLAC: ~$4.53 of annual revenue, ~$1.83 of net income, ~$1.40 of free cash flow. The company returned $3.1B to shareholders in FY2025 ($2.15B buybacks + $905M dividends) — ~1.14% total capital return yield at today's price. Shares outstanding fell from ~135M to ~133M over FY2025.
• ONTO: ~$7.13 of annual revenue, ~$1.46 of net income, ~$1.43 of free cash flow. No buyback or dividend. Q1-annualized ~$1.07B revenue run-rate. Debt-free.
• CAMT: ~$4.97 of annual revenue, ~$1.37 of net income. No buyback or dividend. Q1-annualized ~$474M revenue run-rate. Guided Q2 2025 at $120-123M.

Earnings needed to justify today's price at a 20x P/E: KLAC ~$13.4B net income (vs $4.1B today, 3.3x growth needed). ONTO ~$692M (vs $202M, 3.4x). CAMT ~$432M (vs $119M, 3.6x). At 30x P/E: ~$8.9B, ~$461M, and ~$288M respectively.

Sources: yfinance Jun 2 2026; company earnings releases; arithmetic on reported figures.

What to deep-dive next

• KLA's services business and recurring revenue mix — 75% of services are contract-based. Understanding installed-base economics and service margin would clarify how much of KLA's revenue is quasi-recurring vs cyclical tool sales.
• China exposure and export control risk — China was the largest equipment destination in 2024 ($49.5B). What percentage of each company's revenue comes from China, and which tools are restricted?
• Advanced packaging TAM trajectory — The $10-11B advanced packaging equipment market is growing rapidly. What share do inspection/metrology tools capture vs deposition/etch/bonding? How does HBM4 transition change inspection intensity?
• Camtek's debt structure — ~$488M of debt against $523M cash: maturity schedule, interest rates, acquisition-related or operational.
• Onto's forward P/E discount — At ~29x forward vs KLAC's ~41x and CAMT's ~41x, the market prices Onto for less growth or lower margins. What in its product mix explains this?
• N2 (2nm) ramp timing and process control intensity — KLA expects N2 could be the largest node ever in its first three years. When does spending hit, and how much incremental inspection does gate-all-around architecture require?

Sources & confidence

• KLA Corporation FY2025 10-K & Q4 earnings release — filed Aug 8 2025. Revenue, margins, balance sheet, segment data, share repurchase.
• KLA at Goldman Sachs Communicopia conference — Sep 10 2025. Process control intensity (% of WFE), advanced packaging revenue, installed base, market share, N2 outlook.
• Onto Innovation FY2024 10-K & Q1 2025 earnings release — Feb 2025 and May 2025. Revenue, margins, balance sheet, AI packaging growth.
• Camtek FY2024 & Q1 2025 earnings releases — Feb 2025 and May 2025. Revenue, margins, cash, HBM growth driver commentary.
• SEMI mid-year equipment forecast — 2025. WFE spending ($104.3B/2024, $110.8B/2025, $122.1B/2026), regional breakdown.
• Mordor Intelligence — Semiconductor Metrology & Inspection Equipment Market report (2025). Market size (~$13B in 2025, ~$17B by 2030, 5.4% CAGR), segment breakdown. Third-party estimate.
• Market data — yfinance, Jun 2 2026. Prices, market caps, P/E ratios, EV.

Confidence levels: Company financials (revenue, margins, balance sheet) are from audited filings — high confidence. KLA market share figures (50-60% inspection, 80%+ reticle) are from company and analyst commentary — directionally reliable but not audited est.. Process control intensity (% of WFE) is from KLA management's own estimates at an investor conference est.. Overall market sizing (~$13B) is a third-party estimate est.. Forward P/E figures come from consensus analyst estimates via data feeds — subject to revision.