What Is the VN-Index: The "Temperature" Gauge of Vietnam Stock Market
The VN-Index reflects the price movement of all stocks listed on HOSE. We explain how it is calculated by market cap, why it gets "skewed" by large stocks, and how to read it correctly.
The number the whole market watches every day
When reading Vietnamese financial news, you always see "the VN-Index rose/fell so many points." The VN-Index is the index representing the price movement of all stocks listed on the HOSE exchange — the overall "temperature" gauge of the Vietnamese stock market.
How the VN-Index is calculated
The VN-Index is calculated by market capitalization: the larger a stock cap, the more it influences the index.
- The index compares the current total market value to a base point (base day = 100 points).
- A VN-Index of 1,200 points means total capitalization has grown 12 times versus the base day.
Because it is cap-weighted, a few "giant" stocks can affect the VN-Index more than a hundred small stocks combined.
How the VN-Index differs from the VN30
- VN-Index: all HOSE stocks — the whole-market picture.
- VN30: only the 30 largest, most liquid names — the blue-chip group.
The two indexes complement each other. When the VN-Index and VN30 diverge (one rises, one falls), it signals money flows diverging between the large group and the rest.
The "trap" of a cap-weighted index
This is important to understand: the VN-Index can be "skewed" by a few large-cap stocks.
- A few pillar stocks (giant caps) rising strongly can pull the VN-Index green, even if most other stocks are red.
- So "the VN-Index rose" does not always mean "most stocks rose."
To see the real picture, investors also look at market breadth (the number of advancers versus decliners) — not just the VN-Index level.
How to read the VN-Index correctly
- It is an overall gauge, not your portfolio: a rising VN-Index does not guarantee your stocks rise with it.
- Use it as a benchmark: compare your portfolio performance against the VN-Index to know whether you beat or trail the market.
- Read it with breadth and volume: the level plus volume and advancers/decliners reflects true "health."
- Do not trade each VN-Index session: focus long term instead of guessing tomorrow level.
Conclusion
The VN-Index reflects the price movement of all stocks listed on HOSE, calculated by market cap — so it is easily "pulled" by a few large stocks. It is a whole-market gauge, different from the VN30 (only 30 blue chips). Read the VN-Index alongside market breadth and use it as a benchmark, and do not confuse the index level with your own portfolio.
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