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The Stock Exchange of Thailand closed at 1,588.05 on June 16, retreating from the 1,592 level it held earlier in June when Iran-US peace talks briefly lifted sentiment. After the Fed’s June 17 hawkish hold and the reset of the dot-plot toward hikes, the SET shed roughly 20 points from its June peak. That sounds modest — and compared to regional peers, it is — but it masks significant sector-level divergence. A Fed signalling rate hikes rather than cuts changes the calculus for Thai equities in specific ways that matter right now.
Banking: Rate Divergence Creates Credit Risk, Not Margin Help
Higher US rates do not automatically lift Thai bank margins, because BoT held its policy rate at 1.00% and shows no urgency to move. Thai commercial banks — Bangkok Bank, KBank, SCB, Krungthai — derive their net interest margins from domestic rates, not US rates directly. The indirect effect matters more: a weaker baht raises the cost of dollar-denominated funding for Thai corporates, which can push up NPL risk if borrowers struggle. Thai banks have been working through their post-COVID NPL cleanup, and sustained baht weakness adds stress. Watch KBank and SCB’s Q2 NPL ratios when they report in late July.
Energy: The Iran Peace Ceiling
PTT and its downstream entities (PTTEP, IRPC, Thai Oil) benefit from high oil prices. But the Iran peace deal in mid-June pushed Brent crude from $85 back toward $80, partially reversing the energy sector tailwind. The Strait of Hormuz reopening removed the supply-disruption premium that had been supporting prices. If you own energy stocks for the Middle East risk premium, that trade has weakened. The question now is whether OPEC+ production cuts can offset Iran supply normalisation in Q3 — genuinely unclear.
Export Industrials: Baht Weakness Helps, Conditionally
Thailand’s auto-parts makers, electronics exporters, and hard-drive component manufacturers (Hana Microelectronics, Delta Electronics Thailand) earn in dollars and report in baht. USD/THB at 33 versus 32.50 earlier in the month creates a direct earnings tailwind when converting foreign revenue. The complication: if a Fed hike materialises and slows US demand, export orders weaken. Currency tailwinds only work if the underlying volume holds.
REITs and Property: The Clear Loser
Thai REITs and listed property developers are rate-sensitive assets. With US long-bond yields rising on hike expectations, Thai investors reassess the yield differential between property assets and fixed income. Thai REITs offering 5–6% yields look less compelling when US 10-year bonds approach 4%+. This has already shown up: REIT-heavy portfolios have underperformed the SET by 2–3 percentage points in June 2026, and that gap could widen if the Fed follows through.
Healthcare: The Domestic Shield
Thai hospital groups — Bumrungrad International, BDMS, Samitivej — remain largely insulated from US rate changes. Revenue is domestic and medical-tourism-driven. Bumrungrad has seen consistent patient volume growth from Middle Eastern and Southeast Asian patients, and the Iran peace deal could incrementally increase Iranian medical tourists. Healthcare is the defensive sector of choice on the SET when global macro turns unfriendly.
Portfolio Adjustments for Thai Investors
A portfolio that worked in H1 2026 — overweight energy, some broad SET exposure — needs recalibrating: trim REITs and rate-sensitive property, maintain or add healthcare, and review energy given the oil-price ceiling. For dollar-earning exporters, the currency tailwind is real but fragile. The SET at 1,588 is not cheap by historical standards — it averaged around 1,400 in 2023–2024 — but it is also not in bubble territory. The final answer on whether Thai corporate earnings hold up comes sector by sector over the next two earnings seasons.
