Which Thai Industries One Company Dominates (2026)
In short
PTT Exploration and Production holds 19.68 percent of all mining and quarrying revenue, the steepest single-company dominance of any measured Thai sector as of 2 July 2026. Hua Seng Heng Commoditas is close behind, holding 15.91 percent of wholesale and retail trade, the country's largest sector by company count. Administrative and support and information and communication follow above 13 percent. The average top firm across 18 measured sections holds just 7.81 percent of its sector. Accommodation and food service sits at the other end, where Minor International holds only 2.07 percent. Field size and dominance move on separate tracks.
Which industries does one company dominate?
Rank Thailand's industry sections by how much of their revenue a single company controls and mining tops the list. PTT Exploration and Production books 85.47 billion baht of the sector's 434.27 billion baht total, a 19.68 percent share, the steepest single-firm dominance measured anywhere in the registry (DBD, 2026). Wholesale and retail trade is close behind at 15.91 percent, where Hua Seng Heng Commoditas alone accounts for 5,556.70 billion baht of the sector's 34,929.35 billion baht. Administrative and support services ranks third at 14.73 percent behind True Move H. Information and communication follows at 13.33 percent behind Advanced Wireless Network. Arts and entertainment rounds out the top five at 12.12 percent behind Lotteryplus. Eighteen of the 21 lettered sections carry a usable pair of figures for this ratio. Public administration, households and extraterritorial organizations are left out, each with fewer than 40 registered companies, too thin a base for a stable share.
Top company's share of sector revenue
- Mining and quarrying20
- Wholesale and retail trade16
- Administrative and support15
- Information and communication13
- Arts and entertainment12
- Financial and insurance9
- Transportation and storage9
- Agriculture7
- Manufacturing6
- Human health and social work6
- Professional, scientific and technical5
- Electricity and gas4
- Other services4
- Water and waste4
- Education3
- Real estate3
- Construction2
- Accommodation and food service2
Figures in percent of sector revenue held by the top company.
Mining and wholesale and retail sit well above the rest. Accommodation and food service is the least concentrated sector measured.
Top-firm share by industry section
| Industry section | Top company | Sector revenue (billion baht) | Top company revenue (billion baht) | Top-firm share | Companies in sector |
|---|---|---|---|---|---|
| Mining and quarrying | PTT Exploration and Production | 434 | 85 | 19.68% | 8,231 |
| Wholesale and retail trade | Hua Seng Heng Commoditas | 34,929 | 5,557 | 15.91% | 715,976 |
| Administrative and support | True Move H | 1,099 | 162 | 14.73% | 100,691 |
| Information and communication | Advanced Wireless Network | 1,289 | 172 | 13.33% | 52,537 |
| Arts and entertainment | Lotteryplus | 134 | 16 | 12.12% | 18,486 |
| Financial and insurance | Forth Smart Capital | 3,739 | 344 | 9.21% | 35,567 |
| Transportation and storage | Thai Airways International | 2,135 | 194 | 9.08% | 85,273 |
| Agriculture | Cargill Meats Thailand | 485 | 32 | 6.51% | 19,259 |
| Manufacturing | PTT | 25,162 | 1,562 | 6.21% | 230,396 |
| Human health and social work | Bangkok Dusit Medical Services | 515 | 31 | 5.96% | 17,294 |
| Professional, scientific and technical | Advanced Info Service | 1,049 | 52 | 4.93% | 138,962 |
| Electricity and gas | Gulf SRC | 841 | 37 | 4.46% | 7,833 |
| Other services | Fortasia | 84 | 4 | 4.24% | 20,455 |
| Water and waste | Joon Chee Material Technology | 147 | 6 | 3.79% | 4,818 |
| Education | Saeng Neern Patanakarn | 62 | 2 | 3.30% | 13,897 |
| Real estate | Central Pattana | 1,240 | 35 | 2.86% | 149,608 |
| Construction | Italian-Thai Development | 2,298 | 50 | 2.19% | 283,534 |
| Accommodation and food service | Minor International | 914 | 19 | 2.07% | 83,598 |
Each section's aggregate revenue, its single highest-revenue company, and that company's share of the section total, as of 2 Jul 2026.
Why this matters
Field size and dominance turn out to be unrelated. Mining is the smallest arena measured here, with just 8,231 registered companies, yet its leader claims the highest top-firm share of any sector. Wholesale and retail trade is the largest field by far, with 715,976 companies, 87 times mining's count, and its leader still claims almost as large a share of the sector as mining's leader claims of its own. The average top firm across the 18 measured sections holds 7.81 percent of its sector's revenue. Mining's leader holds about two and a half times that average. Accommodation and food service sits at the opposite pole. Minor International, its sector leader, holds only 2.07 percent of the total, so mining's dominance ratio runs about nine and a half times higher than the least concentrated sector measured. Ownership research from the OECD found strategic individuals sit as the largest shareholder in 51 percent of Thai listed companies, holding an average 26 percent equity stake (OECD, 2025). Concentration inside a sector and concentration inside a shareholder register are two different measures, but both point the same direction. Thai corporate revenue and Thai corporate ownership both cluster around a small number of controlling parties. A lender assessing sector risk, a regulator watching for market power, or a challenger sizing up a field should read the top-firm share as a signal of how much room is actually open to a newcomer.
Definitions
- Top-firm share
- The revenue of a sector's single highest-revenue company divided by the sector's total reported revenue, expressed as a percent.
- TSIC section
- One of the 21 lettered groupings in the Thailand Standard Industrial Classification, the coding scheme every registered company is sorted into, such as mining or wholesale and retail trade.
- Aggregate sector revenue
- The sum of reported revenue across every company classified to a section that filed a financial statement.
- Filing entity
- The single registered company that reports its own revenue. A corporate group made of several filing entities is measured as its separate parts, not as one combined brand.
Assumptions
- Only companies that filed a financial statement contribute to a section's total revenue and to the top-company figure, so unfiled or dormant firms are excluded.
- Public administration, households and extraterritorial organizations are excluded because each has fewer than 40 registered companies, too thin a base for a stable ratio.
- The top company in each section is the single highest-revenue filing entity, not a combined corporate group, so a group that reports through several subsidiaries can appear less dominant than its overall brand.
- Revenue figures are rounded to two decimal places in billion baht for display, so a share recomputed from the rounded table can differ slightly from the more precise figure stated in the text.
Methodology
Top-firm share is each industry section's top_company_revenue divided by its total_revenue, both drawn from the Department of Business Development registry as of 2 July 2026. Sections cover the 21 lettered TSIC groupings, but public administration, households and extraterritorial organizations are dropped because each has fewer than 40 registered companies, leaving 18 sections ranked here. The top company in a section is the single filing entity with the highest reported revenue, not a combined corporate group. Shares are computed directly from the raw revenue figures and then rounded to two decimal places for display.
How we verified this
- Recomputed mining's share as 85,469,910,000 divided by 434,265,492,368.50, which equals 0.19681, or 19.68 percent.
- Recomputed wholesale and retail's share as 5,556,701,724,240.86 divided by 34,929,351,730,992.31, which equals 0.15908, or 15.91 percent.
- Summed all 18 measured shares to 140.56 percentage points and divided by 18, giving 7.81 percent, the stated average.
- Divided the highest measured share by the lowest: 19.68 divided by 2.07 equals 9.51, matching the stated spread of about nine and a half times.
- Confirmed three sections, public administration, households and extraterritorial organizations, were excluded for having fewer than 40 registered companies, leaving 18 of 21 sections ranked.
- Checked the wholesale and retail company count of 715,976 against the mining count of 8,231, a ratio of about 87 times, matching the figure used in the prose.
References
- Department of Business Development. (2026). Registered juristic persons and financial statement aggregates. Ministry of Commerce, Thailand. https://www.dbd.go.th/
- OECD. (2025). The corporate sector: OECD capital market review of Thailand. OECD Publishing. https://www.oecd.org/en/publications/oecd-capital-market-review-of-thailand-2025_0a975590-en/full-report/the-corporate-sector_008c96e5.html
Frequently asked questions
Which Thai industry has the most single-company dominance?
Mining and quarrying, where PTT Exploration and Production alone holds 19.68 percent of the sector's reported revenue as of 2 July 2026.
Is wholesale and retail trade dominated by one company too?
Yes. Hua Seng Heng Commoditas holds 15.91 percent of wholesale and retail trade's revenue, the second highest top-firm share of any measured sector, despite the sector holding 715,976 registered companies.
Which sector has the least single-company dominance?
Accommodation and food service, where Minor International, the sector's revenue leader, holds only 2.07 percent of the sector's total revenue.
Does a sector with more companies always have less concentration?
No. Wholesale and retail trade has 87 times as many companies as mining and quarrying, yet its top-firm share of 15.91 percent sits nearly as high as mining's 19.68 percent.
Cite this page
Chatpong L. (2026). Which Thai Industries One Company Dominates (2026). Max Data Insights. https://maxdatathailand.com/insights/which-industries-are-dominated-by-one-company-in-thailand-2026
Data & corrections
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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.