Semiconductors, or chips, are tiny pieces of silicon that power almost every modern device: phones, cars, computers, appliances, medical equipment and the data centers that run artificial intelligence. Semiconductor companies are among the largest and most closely watched companies in world stock markets. But "semiconductor stock" covers very different businesses. This article explains the main types, how they make money, and how to read their numbers.
What a semiconductor is
A semiconductor is a material, usually silicon, that can be made to conduct electricity in a controlled way. Engineers build billions of microscopic switches, called transistors, onto a small piece of silicon to create a chip. Different chips do different jobs: processors think, memory chips store data, sensors detect light or motion, and power chips manage electricity in cars and machines.
Making chips is one of the most complex manufacturing processes in the world. It happens in ultra-clean factories, called fabs, where wafers of silicon go through hundreds of steps of printing, depositing and etching patterns smaller than a virus.
The main types of semiconductor company
1. Chip designers (fabless). These companies design chips and their software but do not own factories. They pay manufacturers to make the chips. Their costs are mostly people and research, and their success depends on having the best designs.
2. Integrated manufacturers. Some companies both design and make their own chips in their own fabs. This gives control but requires enormous, continuous investment.
3. Contract manufacturers (foundries). These companies make chips designed by others. Building leading-edge foundry capacity costs huge sums, so only a few companies can compete at the top.
4. Memory makers. Memory chips store data in phones, computers and servers. Memory is among the most cyclical parts of the industry: prices can rise or fall sharply as supply and demand shift.
5. Equipment makers. Chip factories need specialised machines for printing patterns, depositing materials, etching, cleaning and inspecting wafers. A small number of companies supply most of this equipment worldwide.
6. Materials, design-software and testing companies. Others supply ultra-pure chemicals and gases, the software used to design chips, and services to test and package them.
Example on PositoAI: Applied Materials
Applied Materials, listed in the US, is one of the world's largest makers of equipment used to manufacture chips. Its machines deposit, etch and modify the extremely thin layers that make up a chip, and it also sells services to keep these machines running. Its customers are chip manufacturers, so its orders rise and fall with how much those manufacturers invest in new factories and upgrades.
On PositoAI (18 Oct 2026): Positivity Score 16,587, ranked #3,132 of 3,999 companies in the US and #5,204 worldwide; market cap about ₹30.8 lakh crore; P/E 35.3; P/B 12.68. These figures change daily.
Why semiconductor stocks behave the way they do
The industry is cyclical. When demand is strong, chip makers expand capacity. When new capacity arrives just as demand cools, prices fall and orders drop. This cycle has repeated many times, and semiconductor shares often move ahead of it.
Equipment makers ride a second cycle. Their sales depend on chip makers' capital spending. When chip makers cut investment, equipment orders can fall even faster than chip sales.
Technology races are expensive. Each new generation of chips needs new designs, new factories and new machines. Companies that fall behind can lose customers quickly.
Geography and policy matter. Advanced manufacturing is concentrated in a few places, especially Taiwan, South Korea, the US and Japan. Governments offer large subsidies to build local chip industries and impose export controls on advanced technology, which can redirect sales.
AI has added a new layer of demand. AI chips, high-speed memory and advanced packaging have grown fast, lifting parts of the industry more than others.
How to read a semiconductor company's numbers
Revenue by segment and end market. Check how much revenue comes from data centers, phones, cars, industry or other markets. Different end markets peak at different times.
Gross margin. Higher margins usually reflect technology leadership or pricing power. Falling margins can signal price competition or underused factories.
Inventory and inventory days. Unsold chips piling up can warn of slowing demand before revenue falls.
Research spending. Semiconductor companies spend a large share of revenue on research. Cutting it can boost short-term profit but weaken long-term position.
Capital spending and cash flow. Manufacturers spend heavily on factories. Free cash flow, the cash left after this spending, shows whether the business funds itself.
Order backlog (for equipment makers). Orders received but not yet delivered give a view of future sales.
Valuation through the cycle. At the peak of a cycle, profits are high and price-to-earnings (P/E) ratios can look low; at the bottom, profits shrink and P/E can look high. Comparing valuations across a full cycle gives a fairer picture.
The Indian angle
India has long been a major centre for chip design, with engineering teams working for global semiconductor companies. In recent years the government has offered incentives to build chip manufacturing, assembly and testing plants in India, and several large projects have been announced with domestic and foreign partners. Listed Indian companies are linked to this through electronics manufacturing, design services, materials and equipment, though India's direct semiconductor manufacturing industry is still at an early stage.
Common misconceptions
"All semiconductor companies rise and fall together." Designers, manufacturers, memory makers and equipment suppliers have different cycles and risks.
"A low P/E means a chip stock is cheap." At the top of a cycle, earnings are temporarily high, so P/E can look low just before profits fall.
"Equipment makers are safer because they sell to everyone." Their sales depend on chip makers' investment, which can swing sharply.
"AI means the chip cycle is over." AI has added strong demand, but cycles in memory, consumer devices and industrial chips still exist.
Frequently asked questions
What is a foundry?
A company that manufactures chips designed by other companies.
Why is memory so cyclical?
Memory chips are fairly standardised, so prices depend heavily on the balance of supply and demand.
What do equipment makers sell?
The machines and services chip factories use to print, deposit, etch, clean and inspect patterns on silicon wafers.
Is India making chips?
India is building its first large chip manufacturing and assembly plants, while already being a major centre for chip design.
How to use this on PositoAI
Search semiconductor companies such as Applied Materials, Nvidia and AMD on PositoAI to compare Positivity Scores, ranks, P/E, P/B and flags. Use Go Deep to follow revenue, margins and cash flow over several years, which matters for a cyclical industry, and Compare for side-by-side views. PosiStep 8 of PosiCourse, PositoAI's free stock market course, explains cyclical and other types of stocks.
Suggested reading
AI Chips Explained · What Is an AI Chip (GPU)? · What Are AI Stocks? · Data Centers and the Stock Market · Bull Market vs Bear Market · What Is Risk in Investing?
Summary
Semiconductors power almost every modern device, and semiconductor companies include chip designers, integrated manufacturers, foundries, memory makers, equipment suppliers and materials and software firms. The industry is cyclical, technology races are costly, and geography and government policy shape where chips are made and sold. Segment revenue, margins, inventory, research spending, capital spending, backlog and valuation across a full cycle reveal far more than the semiconductor label alone.