Large-, Mid-, and Small-Cap Classifications
You've heard 'large caps are stable, small caps are volatile,' right? But from what market cap does a stock count as large-cap? In fact, the standard differs by country.
Dividing by market capitalization
Stocks are divided into large-, mid-, and small-cap by the size of their market capitalization (share price × shares outstanding). They're classified by the company's 'size.'
The general tendency is as follows.
- Large Cap: large, mature companies. Relatively stable with lower volatility. - Mid Cap: in between growth potential and stability. - Small Cap: small in size, so high growth potential but also high volatility and risk.
That said, 'large cap = safe, small cap = risky' is only a tendency, not an absolute law. Large caps can also fall sharply (in 2008 even large caps were cut in half), and there are solid companies among small caps too.
The U.S. divides by 'dollar amount,' Korea by 'rank'
This is a part many people get confused about. The standard differs by country.
The U.S. usually divides by 'dollar amount.' A widely used standard treats large cap as roughly $10 billion or more, mid cap as roughly $2 billion–$10 billion, small cap as roughly $250 million–$2 billion, and below that as micro cap.
Korea (KRX/KOSPI) divides by 'rank.' It classifies KOSPI market-cap ranks 1–100 as large cap, 101–300 as mid cap, and below that as small cap. It's a method that divides by relative position within the market, not by dollar amount.
So if you memorize 'above a certain trillion won in market cap is large cap,' it won't fit across countries, markets, and points in time. Remember that the very method of classification differs.
The U.S. dollar-amount standard isn't absolute either. For example, Morningstar uses a 'relative standard' that treats the top 70% of total U.S. market cap as large, the next 20% as mid, and the next 7% as small. Also, as the market grows, the threshold lines themselves rise over time. You should view it on the premise that it differs by provider, index, and point in time.
Why you should know this classification
Knowing the market-cap classification helps your investing in these ways.
- From a diversification angle: large-, mid-, and small-cap stocks tend to move differently, so splitting your holdings can offer diversification benefits. - Understanding ETFs and funds: you can understand what products like a 'large-cap ETF' or 'small-cap index' hold. - Calibrating your risk tolerance: you can brace in advance for the fact that a small-cap-focused product may have a larger drawdown than large caps.
That said, there's no such thing as one size being 'better.' Each simply has a different risk-and-return character. Comparing the actual drawdowns and recovery periods of various assets directly lets you confirm this difference with your own eyes.
Preguntas frecuentes
Q. Are large caps always safer than small caps?
They do tend to be 'relatively' less volatile, but they're not 'always safe.' During the 2008 financial crisis, even large caps (the S&P 500) fell about −57% from their peak. Big companies can also decline sharply in a crisis, so being a large cap doesn't mean you don't need to brace for drawdowns.
Q. Are 'blue chips' and 'large caps' the same thing?
They're similar but not exactly the same. Large cap purely means 'a stock with large market capitalization,' while blue chip means a company that, on top of size, has shown stable earnings and finances over a long period. Most blue chips are large caps, but not all large caps are called blue chips.
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