Top 5-Digit TSIC Codes by Large Company Count in Thailand 2026
In short
TSIC code 45101 holds 520 large companies, more than any other 5-digit code in Thailand. Code 29309 follows with 427. Only 737 of 1,228 codes contain even one large company. The top 10 codes hold 2,559 of the 13,875 large companies, or 18.44 percent. Large firms cluster in a small set of codes.
Which 5-digit codes hold the most large companies?
Code 45101 wins by a wide margin with 520 large companies (DBD, 2026). Code 29309 comes second with 427. Then the field drops fast. Code 47732 has 260, code 41002 has 229 and code 46622 has 202. Three codes tie at 188, which are 10611, 46900 and 64202. The top two codes alone hold 947 large companies, or 6.83 percent of all 13,875 in the registry. Five of the top ten codes sit in wholesale and retail trade. Manufacturing places two, and construction, finance and utilities place one each.
Large companies in the ten biggest TSIC codes
- 45101520
- 29309427
- 47732260
- 41002229
- 46622202
- 10611188
- 46900188
- 64202188
- 35101181
- 46599176
Figures in large companies.
Code 45101 holds nearly three times as many large firms as code 46599, the tenth.
The top 10 codes in detail
| Rank | TSIC code | Section | Large companies | All companies | Large share |
|---|---|---|---|---|---|
| 1 | 45101 | Wholesale and retail trade | 520 | 10,006 | 5.2% |
| 2 | 29309 | Manufacturing | 427 | 3,461 | 12.34% |
| 3 | 47732 | Wholesale and retail trade | 260 | 15,036 | 1.73% |
| 4 | 41002 | Construction | 229 | 165,550 | 0.14% |
| 5 | 46622 | Wholesale and retail trade | 202 | 5,420 | 3.73% |
| 6 | 10611 | Manufacturing | 188 | 3,877 | 4.85% |
| 7 | 46900 | Wholesale and retail trade | 188 | 17,775 | 1.06% |
| 8 | 64202 | Financial and insurance | 188 | 8,323 | 2.26% |
| 9 | 35101 | Electricity and gas | 181 | 6,981 | 2.59% |
| 10 | 46599 | Wholesale and retail trade | 176 | 36,728 | 0.48% |
Large company count, total registered companies and large share per 5-digit TSIC code, as of 17 Jul 2026. The registry does not label 5-digit codes, so each is shown with its parent section.
How concentrated is the large-company map?
Of 1,228 codes in the registry, 737 hold at least one large company. That leaves 491 codes with none at all. Among the 737, 345 codes hold between one and five. At the other end, 31 codes hold 100 or more. The top 50 codes hold 6,884 large companies, or 49.62 percent of the total. The top 100 codes hold 9,130, or 65.8 percent. Half of Thailand's large companies fit inside about 4 percent of its industry codes.
Why this matters
Large companies are the buyers and suppliers that move whole supply chains. If you sell to them, you do not need to chase 737 codes. You need to understand a few dozen. Code 29309 is the sharpest example. It has 427 large companies among just 3,461 registered, a large share of 12.34 percent. Code 41002 runs the other way, with 229 large firms spread thin across 165,550 companies. A lender, a supplier or a policy team should read these two codes very differently, even though both rank near the top. Raw count shows where large firms gather. Large share shows where large firms define the market. Use both.
Definitions
- TSIC
- Thailand Standard Industrial Classification. A code system that assigns each company to an industry. The 5-digit level is the most detailed.
- Large company
- A company in the registry's large size band, the top size category above micro, small and medium.
- Large share
- Large companies in a code divided by all registered companies in that code.
- Aggregate
- A count or total summed across many companies, with no individual company shown.
Assumptions
- Size bands follow the registry classification and rely on filed financial data.
- Counts include all registered large companies in a code, active or not.
- A company is assigned to one primary code, so activity in other codes is not counted.
- The registry total of 13,875 differs by one from the national size-band anchor of 13,876.
Methodology
Counts come from the Department of Business Development registry, aggregated by 5-digit TSIC code as of 17 July 2026, the computed date of the rows queried. A large company is one in the registry's large size band. The total of 13,875 large companies is the sum across all 1,228 codes and differs by one from the national size-band figure of 13,876. Shares are recomputed from raw counts. The registry carries no text labels for 5-digit codes, so only the section is named.
How we verified this
- Codes with at least one large company: 737 of 1,228, which is 60.02 percent.
- Sum of large companies across all codes: 13,875. Top 10 sum: 520+427+260+229+202+188+188+188+181+176 = 2,559. Share 2,559 / 13,875 = 18.44 percent.
- Top 2 sum 520+427 = 947. Share 947 / 13,875 = 6.83 percent.
- Top 50 sum 6,884 / 13,875 = 49.62 percent. Top 100 sum 9,130 / 13,875 = 65.80 percent.
- Large share for code 29309: 427 / 3,461 = 12.34 percent. Code 41002: 229 / 165,550 = 0.14 percent. Code 45101: 520 / 10,006 = 5.20 percent.
- Codes with 1 to 5 large companies: 345 of 737 = 46.81 percent. Codes with none: 1,228 - 737 = 491.
- Top 10 section split: five wholesale and retail, two manufacturing, one each construction, finance, utilities, total 10.
References
- Department of Business Development. (2026). Registered juristic persons and size-band aggregates by TSIC code. Ministry of Commerce, Thailand. https://www.dbd.go.th/
Frequently asked questions
Which TSIC code has the most large companies in Thailand?
Code 45101 has 520 large companies as of 17 July 2026, according to the DBD registry.
How many TSIC codes contain any large company?
737 of 1,228 codes, or 60.02 percent. The other 491 codes have none.
What share of large companies sits in the top 10 codes?
The top 10 codes hold 2,559 of 13,875 large companies, which is 18.44 percent.
Why not name what each code does?
The registry aggregate carries no text labels for 5-digit codes, so this page names only the parent section. Look up a code in the official TSIC classification for its description.
Cite this page
Chatpong L. (2026). Top 5-Digit TSIC Codes by Large Company Count in Thailand 2026. Max Data Insights. https://maxdatathailand.com/insights/top-5-digit-tsic-codes-by-large-company-count-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.
Related insights
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.