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If you have looked at the SET Index and come away with a rough idea that Thailand is "an emerging market with a few big banks", you have the same picture I had before I actually counted what is in it.
The number that changed how I read this market is this: one company accounts for 16.8% of the entire Thai stock market. Not a sector. One listed company.
This article is the structural tour I wish I had found in English — how big the market is, what is actually in it, and the two facts about its shape that matter more than any forecast.
The size of it
Thailand runs two boards. The Stock Exchange of Thailand (SET) is the main one; the Market for Alternative Investment (mai) is the smaller-company board.
| Board | Listings | Combined market cap |
|---|---|---|
| SET | 1,048 | 20.33 trillion THB |
| mai | 237 | 0.27 trillion THB |
| Total | 1,285 | 20.60 trillion THB |
At roughly 32 baht to the dollar that is about 640 billion USD — comparable to a single US mega-cap. The whole of Thailand's listed equity is smaller than several individual companies on the NASDAQ.
Two things follow from that and both matter more than most commentary admits.
Fact one: this market is extraordinarily concentrated
| Group | Share of total market cap |
|---|---|
| Largest company | 16.8% |
| Top 10 | 50.5% |
| Top 50 | 79.2% |
Half the market sits in ten names. Four out of every five dollars of market value sits in fifty.
For comparison, the S&P 500's top 10 have drawn a lot of attention for reaching roughly a third of that index — and that is considered historically concentrated. Thailand's top 10 are at half, out of a listed universe of 1,285 rather than 500.
The practical consequence: an index fund tracking Thailand is not a diversified bet on Thailand. It is a large position in a handful of companies with a long tail attached. If you are buying the index because you have a view on Thai consumption or tourism, check whether the index actually expresses that view — quite often it does not.
Fact two: the sector mix is not what the tourist economy suggests
People associate Thailand with tourism, food and hospitality. The market's weight sits somewhere else.
| Sector | Companies | Market cap (THB bn) |
|---|---|---|
| Electrical Equipment & Parts | 11 | 3,484 |
| Banks — Regional | 10 | 2,886 |
| Telecom Services | 11 | 1,687 |
| Utilities — Independent Power | 10 | 1,237 |
| Oil & Gas Integrated | 1 | 1,090 |
| Airports & Air Services | 3 | 925 |
| Medical Care Facilities | 35 | 665 |
Electronics manufacturing is the single largest block, ahead of banking. Thailand is a major contract manufacturing base, and that shows up in the index far more than hotels do.
Note the shape of the medical care row: 35 companies carrying less market value than 11 electronics names. Thailand has a genuinely large private hospital sector by count, but it is not where the index weight lives.
What the market looks like on fundamentals
Medians across all common stocks on each market, so one enormous company cannot skew the picture:
| Median | Thailand | United States |
|---|---|---|
| P/E | 11.54 | 8.17 |
| P/BV | 0.80 | 1.32 |
| ROE | 5.89% | 3.28% |
| Dividend yield | 2.83% | 0.00% |
| D/E | 0.24 | 0.20 |
The two figures worth pausing on: the median Thai stock trades below its book value, and the median US stock pays no dividend at all while the median Thai stock pays 2.83%.
One caveat on the comparison, because it would be easy to over-read. These are medians across every listed common stock, and the two universes are not built the same way — the US list includes thousands of micro-caps, shells and recent listings that drag its median P/E and dividend down. The comparison is honest about method but it is not the same as comparing two index-weighted averages.
Reading this market without getting it wrong
Three things I would tell anyone approaching Thai equities from outside:
Check what you actually own
Given 50.5% in ten names, "exposure to Thailand" through an index is mostly exposure to electronics manufacturing, banks and telecoms. That may be exactly what you want. It should be a decision, not a surprise.
Low P/BV is a question, not an answer
A median price-to-book of 0.80 says the market prices the average Thai listed company below the accounting value of its assets. Markets do that for reasons. Working out whether those reasons apply to a specific company is the actual work — and the long-run return record is the first thing to explain before treating cheapness as opportunity.
The dividend profile is the real structural difference
This is where Thailand genuinely differs from the US market rather than just being smaller: 49% of Thai listed companies yield above 3%, against 13% in the US.
Where to look at the underlying data
Every figure above is computed from the full list of Thai listings, refreshed after each close. You can browse the complete set — all 1,285 securities with P/E, ROE, dividend yield and quality score, ordered by market cap — at all Thai stocks, or compare against all US stocks on the same fields.
This article is for education and general information only and is not personalised investment advice. All figures are generated automatically from data disclosed by listed companies as at the date of publication and change over time. Market capitalisation figures are in Thai baht; the USD conversion is approximate. Past performance is not indicative of future results. Investors should do their own research and assess their own risk tolerance before making any investment decision.
