Headlines say "Wall Street rose" or "the Nasdaq fell" as if there were one US market. There are several indices, built differently, and they can tell different stories on the same day. This guide explains what the S&P 500, Nasdaq-100, Nasdaq Composite and Dow Jones Industrial Average measure, how their weighting works, why they diverge, and how an Indian learner can follow them. It is education, not a recommendation to invest in any index or fund.
| Index | What it contains | Weighting |
|---|---|---|
| S&P 500 | About 500 large US-listed companies chosen by a committee against published criteria | Market-cap weighted |
| Nasdaq-100 | 100 of the largest non-financial companies listed on Nasdaq; heavy in technology | Modified market-cap weighted |
| Nasdaq Composite | Nearly all common stocks listed on Nasdaq, thousands of companies | Market-cap weighted |
| Dow Jones Industrial Average | 30 large US companies | Price weighted |
Each company's influence is proportional to its market value, which is its share price multiplied by the number of its shares. The largest companies move the index the most. When a handful of mega-cap stocks rise sharply, the index can climb even if most other members are flat or falling. That is why an "equal-weighted" version of the S&P 500, which gives every member the same weight, can behave differently.
The Dow adds up the share prices of its 30 members and divides by a special divisor. A stock with a high share price has more influence than one with a lower price, regardless of company size. That is a historical quirk, and it is one reason professionals usually treat the S&P 500 as the broader benchmark.
You can compare their moves live on our charts, and review a position in any of them with Samjho Bhai, which accepts S&P 500, Nasdaq and Dow levels alongside Indian stocks.
Choose Index, enter the S&P 500, Nasdaq or Dow with your units and buy level in index points, and get a Buy, Hold or Sell read with Stop-Loss and Take-Profit. Free, no sign-up.
REVIEW A US INDEX →An index is a calculation, not something you can buy directly. Exposure usually comes through funds and ETFs that track an index, with their own costs and tracking differences. Routes for Indian residents include Indian funds and ETFs that invest overseas (subject to industry limits that have at times paused new investments) and overseas or GIFT City brokers funded under the RBI's Liberalised Remittance Scheme. Currency risk applies: the rupee value depends on the index level and USD/INR. Tax and reporting rules also apply and change, so check current rules. Our guide How to invest in US stocks from India covers routes, rules and risks.
The regular session is 9:30 am to 4:00 pm Eastern, which is 7:00 pm to 1:30 am IST in US daylight time and 8:00 pm to 2:30 am IST in standard time. Key US data releases and Federal Reserve decisions often land in the Indian evening; the economic calendar shows them in IST, and our trading-hours guide lines up every market.
Our free US stocks learning track goes through the basics step by step. To see how structure and trend are read on the same charts, explore the mentorship tracks, and for the equivalent Indian benchmarks read Nifty vs Sensex.
The S&P 500 covers about 500 large US companies across all sectors. The Nasdaq-100 covers 100 of the largest non-financial companies listed on Nasdaq and is much heavier in technology, so it is usually more concentrated and often more volatile.
The Dow is a historical index that adds the share prices of its 30 members and divides by a divisor, so higher-priced shares have more influence regardless of company size. Most professionals use the S&P 500 as the broader benchmark.
Indian residents can gain exposure through Indian funds and ETFs that invest overseas, subject to limits, or through overseas or GIFT City brokers under the RBI's Liberalised Remittance Scheme. Costs, taxes and reporting rules apply and change, so check current rules.
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