Thai Industry Codes With Exactly One Large Company (2026)
In short
126 of Thailand's 1,228 five digit industry codes have exactly one large company, or 10.3 percent of all codes. That single firm earns 63.5 percent of the revenue in those codes combined, as of 17 July 2026. In 26 codes it earns 80 percent or more. In 37 codes it earns under a quarter. Manufacturing is where the lone giant rules, and trade is where it barely registers.
How many codes hang on one large firm?
Exactly 126 of Thailand's 1,228 industry codes have a single large company (DBD, 2026). That is 10.3 percent of the map. Another 611 codes hold two or more large firms, and 491 hold none at all. Where one large firm stands alone, it takes 63.5 percent of the revenue its code reports. The average code in the group gives its large firm 47.5 percent. The median is 46.4 percent. So the typical lone giant holds close to half of its code, and a long tail holds far more.
Codes by the revenue share of the lone large company
- Under 25 percent37
- 25 to 50 percent33
- 50 to 80 percent30
- 80 percent or more26
Figures in number of industry codes.
The split is nearly even. Many lone large firms are modest, but 26 codes sit at 80 percent or more.
What the lone large firm earns, by share band
| Share of code revenue | Codes | Companies in those codes | Lone large firm share of band revenue |
|---|---|---|---|
| Under 25 percent | 37 | 33,359 | 10.98% |
| 25 to 50 percent | 33 | 10,942 | 34.35% |
| 50 to 80 percent | 30 | 4,013 | 63.32% |
| 80 percent or more | 26 | 9,270 | 97.71% |
Industry codes with exactly one large company, grouped by that firm's share of code revenue, as of 17 Jul 2026.
Where the monopoly like codes sit
Manufacturing holds 43 of the 126 codes, or 34.1 percent. In those 43 codes the lone large firm earns 81.9 percent of revenue. Mining and quarrying has just 5 codes, yet the lone firm earns 79.3 percent there. Arts and entertainment has 5 codes and a 68.8 percent share. Wholesale and retail trade has 17 codes but only a 27.9 percent share, because many small traders surround one large player. The 26 codes at 80 percent or more hold only 9,270 companies, and the lone large firm in them earns 97.7 percent of their revenue.
Revenue share of the lone large firm, by industry section
- Manufacturing, 43 codes82
- Wholesale and retail trade, 17 codes28
- Agriculture, 14 codes50
- Transportation and storage, 6 codes42
- Administrative and support, 6 codes30
- Information and communication, 6 codes19
- Mining and quarrying, 5 codes79
- Education, 5 codes21
- Arts and entertainment, 5 codes69
- Professional, scientific and technical, 4 codes17
- Other services, 4 codes45
- Construction, 3 codes23
- Water and waste, 3 codes25
- Financial and insurance, 3 codes33
- Accommodation and food service, 2 codes18
Figures in percent of code revenue.
Each bar pools all single large firm codes inside the section. Sections with 2 to 6 codes are small samples.
Why this matters
A lone large firm is a rough sign of an entry barrier. Capital, licences or scale have kept rivals at the mid size or below. For a supplier, it means one buyer can set terms for a whole code. For a new entrant, it means the incumbent is the benchmark and the main competitor. For a lender or analyst, it means a code's health can rest on one balance sheet. Yet the data also warns against easy readings. In 37 codes the lone large firm earns under 25 percent, so size alone does not mean control. These codes together report 856 billion baht, which is 1.07 percent of national revenue. They are a small slice of the economy, but they show where one balance sheet carries a whole market.
Definitions
- TSIC code
- Thailand Standard Industrial Classification. A five digit code that classifies a company's main activity.
- Large company
- A company in the registry's largest size band.
- Lone large firm share
- Revenue of the top company in a code divided by the code's total reported revenue.
- Entry barrier
- A cost or constraint that makes it hard for a new firm to reach the scale of incumbents.
- Aggregate
- A total pooled across companies, rather than an average of individual company figures.
Assumptions
- The top company by revenue is treated as the code's large firm.
- Only companies that filed financial statements contribute revenue.
- Companies are classified by one main code, so cross code activity is not captured.
- Small samples in sections with 2 to 6 codes make their shares volatile.
Methodology
Source: Department of Business Development registry aggregates by five digit TSIC code, rows computed 17 July 2026. A code counts as having exactly one large company when its large company count equals one, using the registry size band. The lone firm's share is the revenue of the code's top company divided by total reported revenue of the code. Revenue covers only companies that filed a financial statement. We assume the top company in a code is the large firm, which is an inference since the table does not flag it. Code names are not available, so industry sections are used for grouping.
How we verified this
- Code counts: 126 one large + 491 none + 611 two or more = 1,228 codes, matching the table total.
- Share of codes: 126 / 1,228 = 10.26 percent.
- Aggregate share: 544,123,762,562 / 856,225,873,304 baht = 63.55 percent.
- Band counts: 37 + 33 + 30 + 26 = 126 codes, and companies 33,359 + 10,942 + 4,013 + 9,270 = 57,584.
- Top band: 436,572,318,901 / 446,822,734,742 baht = 97.71 percent. Under 25 band: 25,948,426,907 / 236,257,940,530 = 10.98 percent.
- Section counts: 43+17+14+6+6+6+5+5+5+4+4+3+3+3+2 = 126. Manufacturing 416,858,997,641 / 508,942,043,475 = 81.91 percent, and 43 / 126 = 34.13 percent.
- Share of national revenue: 856,225,873,304 / 80,148,033,688,000 = 1.07 percent.
References
- Department of Business Development. (2026). Registered juristic persons and financial statement aggregates by TSIC code. Ministry of Commerce, Thailand. https://www.dbd.go.th/
Frequently asked questions
How many Thai industry codes have exactly one large company?
126 of 1,228 five digit codes, or 10.3 percent, as of 17 July 2026 (DBD, 2026).
How much of the code does the lone large company earn?
Across all 126 codes combined it earns 63.5 percent of revenue. The median code gives it 46.4 percent.
Does one large company mean a monopoly?
Not by itself. In 37 codes the lone large firm earns under 25 percent of revenue, so many smaller rivals share the rest.
Which section has the most such codes?
Manufacturing, with 43 codes and an 81.9 percent revenue share for the lone large firm.
Cite this page
Chatpong L. (2026). Thai Industry Codes With Exactly One Large Company (2026). Max Data Insights. https://maxdatathailand.com/insights/thai-industry-codes-with-exactly-one-large-company-2026
Data & corrections
Download the data (CSV)Spot something off, or want to ask about the data? Email insights@maxsolutions.co.th. We publish corrections.
Written by
Chatpong L.Founder, Max Data, Max Solutions Co., Ltd.
Chatpong L. leads Max Data, a company-intelligence platform built on Thailand's official business registry. He writes about the structure of the Thai economy using primary registry data. His work covers company formation, industry concentration, and regional business activity.
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This page reports company-level and aggregate statistics only. It names no individuals and makes no claims about any person. Figures are provided for information and may be revised as source data updates.