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SET 50 at 1,538 dominates the Thai market headlines, but the SET MAI board — Thailand’s small and mid-cap market — has been quietly delivering more interesting individual stock stories through 2026. Q1 earnings showed meaningful divergence: select MAI names posted 25-40% YoY profit growth while the SET large-caps averaged single-digit moves. For Thai retail investors willing to do the work, MAI is where alpha actually lives in 2026.
The MAI landscape
The Market for Alternative Investments (MAI) is the SET’s secondary listing board for smaller-capitalization companies that don’t meet the main board’s listing requirements. As of mid-2026, MAI hosts roughly 200 listed firms across most sectors with a smaller average free float and lighter institutional ownership than SET 50 names.
That’s both the opportunity and the risk: less institutional ownership means less efficient pricing, which creates alpha for active investors but also wider spreads and lower liquidity for entry/exit.
Where Q1 2026 earnings actually surprised on MAI
Three pockets of MAI deserved attention this earnings season:
- Specialty medtech and healthcare services — several mid-sized players posted 25-35% YoY profit growth on aging-population demand and post-COVID elective procedure backlogs working through
- Smaller renewable energy developers — names with rooftop solar and biogas exposure benefited from PDP 2024 tariff adjustments and accelerated permit approvals
- Specialty chemicals and packaging — niche players in food-grade and pharmaceutical packaging captured pricing power as commodity chemicals stayed weak
I’m not naming specific tickers because the picks deserve your own due diligence — MAI’s volatility means that what’s a buy today could trade sharply differently next week if a name appears in a broker recommendation.
What separates MAI from SET small-cap risk
Three structural differences from buying small SET-listed stocks:
- Lower disclosure requirements — MAI listings have lighter financial disclosure than SET main board. Investors do more independent verification
- Higher concentration risk — many MAI names have founder-family ownership above 50%. Strategic decisions can run against minority interest
- Liquidity drops fast in stress — in a market sell-off, MAI names can drop 15-25% in days with little supporting bid
That’s not an argument against MAI exposure — it’s an argument for position sizing. Single MAI position above 2% of portfolio for retail is asking for trouble.
How Thai retail should actually approach MAI
Three practical paths:
- MAI ETF or fund — Krungsri and a few other AMCs offer MAI-focused funds. Diversifies single-stock risk; gives sector exposure without picking
- 5-7 hand-picked MAI names — basket approach with each name capped at 1-2% of portfolio. Requires real research time
- Single MAI bets — for higher conviction views only. Cap at 2% of portfolio. Treat as high-risk allocation, not core
Tax angle
MAI dividend taxation is the same as SET: 10% withholding at source, final. Capital gains on SET/MAI-listed shares for individual investors are tax-exempt. That’s a meaningful advantage versus speculating in privately-held SME equity, where gains are taxable as ordinary income.
For longer-horizon MAI holdings (3+ year intent), the tax-free capital gains plus 4-5% dividend yields (where available) build up to material after-tax compounding.
What’s driving MAI performance in 2026
Two macro factors:
- BOT at 1% is supportive of equity valuations generally, but especially smaller-cap names where discount-rate sensitivity is higher
- Foreign institutional flows have focused on SET 50 large-caps; MAI is more domestic-retail driven, less exposed to foreign rotation
The first means MAI valuations have benefited from the low-rate environment. The second means MAI is less vulnerable to a foreign-flow reversal but more vulnerable to a Thai retail confidence shift.
Portfolio role
For Thai retail with THB 1-3M investable assets, a reasonable MAI allocation is 5-10% of equity exposure — meaning 2-5% of total portfolio. Below that, the alpha potential isn’t material; above 15% of equity exposure, the volatility starts to dominate portfolio behavior.
Practical takeaway
MAI is the part of Thai equity where research effort actually pays off. If you have time to do bottom-up work on 5-10 names per quarter, it’s a meaningful alpha source. If you don’t, the MAI ETF route gives most of the diversification benefit without the research cost. What doesn’t work: buying single MAI names based on a broker recommendation without your own analysis. That’s where Thai retail has historically lost the most money on MAI.
