In June 2026, Thailand's Department of Special Investigation (DSI) conducted raids on 34 companies suspected of operating nominee shareholder structures across Koh Samui and Koh Phangan. Among the targets was a villa development in Bo Phut covering 98 rai of land with an estimated value of 1.57 billion THB. The operation exposed a mechanism our analysts have been tracking for several years: vertically integrated company chains in which Thai shareholders appear on paper only, while effective management and financial control rest with foreign investors.
The scale of what was uncovered is significant. A single law office linked to hundreds of connected entities held assets valued at approximately 795 million THB. This is not a fringe phenomenon - it is a structural feature of the Koh Samui land market. For any foreign buyer considering a villa purchase on the Gulf of Thailand islands, this case functions as a detailed risk model, not a distant headline. Below, we set out the detection mechanisms the DSI applies, the legal consequences, and the compliant alternatives that exist under Thai law.
Quick answer
- The June 2026 DSI operation targeted 34 companies on Koh Samui and Koh Phangan, including a Bo Phut project valued at 1.57 billion THB
- Primary DSI detection triggers include mismatches between declared Thai majority shareholding and actual foreign management control
- One law office linked to hundreds of entities with combined assets of 795 million THB fits the classic 'nominee factory' pattern
- Consequences for a foreign buyer found using a nominee structure: asset confiscation, fines up to 1 million THB, imprisonment up to 3 years, and deportation
- The Foreign Business Act (1999) prohibits foreigners from holding Thai land directly; nominee arrangements circumvent this prohibition and constitute a criminal offence
- Compliant alternatives include leasehold 30+30+30, condominium freehold (up to 49% of a building's total area), BOI-promoted company structures, and superficies rights
Options and scenarios
How the DSI identifies shell shareholders
Based on the June 2026 operation and earlier DSI actions that our team has monitored, we identify five measurable indicators that typically trigger a formal investigation.
1. Vertical company integration. A single foreign principal controls a chain comprising a holding company, an operating company (villa or resort management), and a land-holding company. In the Bo Phut case, foreign principals directed operations despite nominal Thai majority ownership.
2. Repeated Thai shareholders with no proportionate capital contribution. The DSI cross-references declared income against shareholding value. A Thai national reporting monthly earnings of 15,000 THB who holds a 51% stake in a company valued at 50 million THB presents an immediately auditable discrepancy.
3. Registration concentration at a single law office. When one firm is linked to hundreds of entities holding assets worth 795 million THB, the firm itself becomes a point of investigation. Based on our observations, the DSI uses network analysis, mapping connections through shared directors, registered addresses, and legal representatives.
4. Power-of-attorney and signature patterns. If the Thai majority shareholder never appears at shareholder meetings and all operative documents are signed by a foreigner under a broad general power of attorney, the DSI treats this as evidence of nominee status.
5. Financial flow analysis. Bank account records showing that land acquisition funds originated entirely from abroad, with no verifiable capital contribution from Thai co-shareholders, form a core evidentiary layer in DSI investigations.
Scenario A: buyer uses a nominee company structure
A foreign buyer acquires a villa in the Bophut area for 18 million THB through a Thai Limited Company in which two Thai nationals - nominated by a local law firm - hold 51% of shares. The foreign buyer holds 49% formally but controls the company through side agreements and a general power of attorney. Setup cost: approximately 80,000-150,000 THB.
Risk profile: full exposure to DSI investigation. If detected, the loss scenario covers the property value (18 million THB), criminal fines, legal defence costs, and potential deportation with a re-entry ban.
Scenario B: registered leasehold 30+30+30 with superficies
The same buyer negotiates a 30-year land lease registered at the Land Office, combined with a superficies right (the right to own a structure on leased land). The villa building is owned outright by the foreign lessee; the land is not. Legal structure cost: approximately 200,000-350,000 THB covering due diligence, contract drafting, and registration fees.
Risk profile: substantially lower than Scenario A. However, extension options beyond the initial 30-year lease period are not court-enforceable under Thai law - they rest on the landowner's contractual commitment. Based on our estimates, 70-80% of foreign-involved villa transactions on Koh Samui in 2025-2026 use this model.
Scenario C: condominium freehold within the statutory 49% quota
A buyer purchases an apartment in a condominium building in Chaweng Noi for 10 million THB under freehold title. The legal requirement: foreign ownership within the building must not exceed 49% of total usable floor area. Funds must originate from abroad and be documented via a Foreign Exchange Transaction Form (FET).
Risk profile: minimal from a legal standpoint. The key limitation is that freehold condominium ownership does not include land, which makes this model inapplicable to standalone villas.
Comparison table
| Parameter | Nominee company | Leasehold 30+30+30 | Freehold condo |
|---|---|---|---|
| Asset type | Villa with land | Villa on leased land | Apartment unit |
| Land control | Nominal only (illegal) | Registered lease (legal) | None (common ownership) |
| Typical price on Koh Samui | 10-18 million THB | 10-18 million THB | 5-12 million THB |
| Legal structure cost | 80,000-150,000 THB | 200,000-350,000 THB | 50,000-100,000 THB |
| Confiscation risk | High (Land Code arts. 96, 97) | Low | Minimal |
| Criminal penalty | Up to 3 years, fine up to 1 million THB | None | None |
| Deportation risk | Yes | No | No |
| Resale liquidity | Impaired (legal liability) | Moderate (lease assignment) | High (full title) |
| Dispute protection | None (side agreements unenforceable) | Land Office registration | Chanote title deed |
Risks and mistakes
Mistake 1: assuming a nominee structure is 'safe because it has worked so far'
In the Bo Phut case, the entities under investigation had operated without incident for years. That track record created a false sense of security. DSI investigations are intelligence-driven and cumulative - the June 2026 operation was the result of months of network mapping, not a random audit. Structures that have not yet been flagged are not structures that cannot be flagged.
Mistake 2: relying on side agreements as security
We regularly field questions about 'protective supplementary agreements' in nominee arrangements - loan agreements, repurchase options, general powers of attorney. Under Thai law, a court will not enforce agreements whose explicit purpose is to circumvent the Foreign Business Act. Beyond being unenforceable, such documents become prosecution evidence in criminal proceedings.
Mistake 3: underestimating the total financial exposure
The cost of detection extends well beyond the statutory fine. For a villa valued at 15 million THB, our analysts estimate the full loss scenario as follows:
- Forced asset disposal: 15 million THB
- Fines under the Foreign Business Act and Land Code: up to 2 million THB
- Legal defence costs: 500,000-1,500,000 THB
- Loss of residency and re-entry ban: unquantifiable but operationally material
- Total estimated exposure: up to 18.5 million THB
Mistake 4: assuming Koh Samui operates below regulatory radar
Foreign inbound transfers in Surat Thani province grew by 220% in 2025, based on market data as of July 2026. That scale of capital inflow draws regulatory attention. Koh Samui is no longer treated as a secondary market by the DSI - it is now a priority alongside Phuket.
Mistake 5: using a high-volume company registration firm
If the law office establishing a foreign buyer's company also manages dozens or hundreds of similar entities, risk multiplies substantially. The DSI maps networks through shared registered addresses. In the June 2026 operation, one firm linked to 795 million THB in assets meant that every company in that network became a potential target by association.
FAQ
Are nominee shareholder structures legal in Thailand?
No. Using Thai nationals as nominee shareholders to circumvent the Foreign Business Act of 1999 is a criminal offence. Penalties include imprisonment of up to 3 years and fines of up to 1 million THB. The Land Code further provides for forced disposal of land acquired in violation of ownership restrictions.
What five indicators does the DSI use to detect nominee arrangements?
Based on the June 2026 operation and prior DSI actions, the five primary indicators are: a mismatch between declared Thai shareholding and actual foreign management control; no verifiable capital contribution from Thai co-shareholders proportionate to their stake; concentration of company registrations at a single law office address; power-of-attorney patterns that grant foreigners full operational control; and bank records showing exclusively foreign-sourced acquisition funds.
What is the total financial risk if a nominee structure is detected?
Based on our estimates for a villa valued at 15 million THB, the total exposure reaches approximately 18.5 million THB. This covers the forced disposal of the asset, statutory fines under the Foreign Business Act and Land Code, legal defence fees, and the non-quantifiable impact of losing Thai residency rights.
How can a foreigner legally acquire a villa in Thailand?
The most widely used compliant structure is a registered leasehold of 30 years combined with a superficies right, which grants the foreign party ownership of the building on leased land. Alternatives include freehold condominium purchase (within the 49% foreign-ownership quota per building) and operating through a BOI-promoted company that qualifies for specific land ownership exemptions.
Are the 30+30 lease extension options legally guaranteed?
No. Thai law does not make lease extension options beyond the initial 30-year term court-enforceable. Subsequent periods rest on the contractual commitment of the landowner. Their enforceability depends on the specific contractual language and the circumstances at the time of renewal.
Do the 2026 DSI raids apply only to Chinese investors?
The June 2026 operation on Koh Samui and Koh Phangan centred on a network linked to Chinese principals, but the Foreign Business Act draws no distinction by nationality. Any foreign national using a nominee structure - regardless of passport - is subject to the same statutory provisions and risks.
How can a buyer verify whether a law firm is a 'nominee factory'?
Our analysts recommend checking the number of companies registered at the same address in the Department of Business Development (DBD) database. If several dozen or more entities with foreign co-shareholders share one address, that is a measurable red flag and a reason to use a different legal adviser.
Is Phuket subject to less DSI scrutiny than Koh Samui?
No. Phuket is a more mature market with a longer enforcement history - the DSI has conducted comparable operations there in prior years. Based on our monitoring, the intensification of investigations on Koh Samui in 2026 reflects the market's rapid growth trajectory, with foreign inbound transfers in Surat Thani province up 220% in 2025.
What does a compliant leasehold structure cost on Koh Samui?
Based on our estimates, a full leasehold structure including superficies right costs between 200,000 and 350,000 THB. That figure covers title due diligence, contract drafting in both Thai and English, Land Office registration, and applicable government fees.
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