Top SET 100 Gainers and Losers on May 15, 2025
A Closer Look at Thailand’s Stock Market on a Tough Day
Hey there, let’s dive into what happened in Thailand’s stock market on May 15, 2025. It wasn’t a pretty day for the SET 100, with the index taking a significant hit amid growing economic concerns. Whether you’re an investor or just curious about market trends, this breakdown of the top gainers, losers, and underlying factors will give you a clear picture of the volatility—and maybe even a few ideas on navigating it.
The Stock Market Thailand faced a rough patch as global trade tensions and domestic challenges weighed heavily on investor confidence. Stick with me as we unpack the numbers, spotlight key players, and explore what might be coming next for the Thai economy.
Market Snapshot: SET 100 Takes a Dive
On May 15, 2025, the SET Index closed at 1,194.49 points, marking a steep drop of 1.83% from the previous day. Trading volume hit THB 45.79 billion, a sign that many investors were either offloading positions or sitting tight, waiting for clearer signals. According to reports, this decline reflected broader worries about Thailand’s economic outlook, especially with looming international pressures [16].
What’s driving this unease? A mix of disappointing corporate earnings for Q1 2025 and uncertainty around political moves like the upcoming 2026 budget discussions played a role. When you layer on external risks, it’s no surprise the SET 100 felt the heat.
Economic Clouds on the Horizon
Thailand’s economy isn’t exactly inspiring confidence right now. Consumer sentiment has sunk to a seven-month low as of April 2025, a trend likely spilling into May, fueled by fears of U.S. tariffs on Thai exports. The Finance Minister has even warned that these tariffs could shave up to 1% off GDP growth this year [17][18]. That’s a big deal for a market like Thailand, where exports are a lifeline.
Add to that a sluggish Q1 growth rate of just 2.9%—down from 3.2% in the prior quarter—and you’ve got a recipe for jittery investors. Let’s not forget the drop in tourist numbers, especially from China, which has hit sectors like hospitality hard [5].
Top SET 100 Gainers: Who Defied the Downturn?
Even on a gloomy day for the Stock Market Thailand, a handful of companies in the SET 100 managed to shine. Here are the top 20 gainers on May 15, 2025, based on daily price changes. I’ve pulled this data straight from the latest market reports to give you the most accurate snapshot [14].
| Company | Price (THB) | Daily Change | YTD Performance |
|---|---|---|---|
| SISB | 18.20 | +5.20% | -39.33% |
| PLANB | 4.50 | +4.17% | -36.62% |
| BTG | 24.60 | +2.50% | +30.85% |
| CPALL | 55.25 | +1.47% | -1.34% |
| TRUE | 8.85 | +1.14% | +73.53% |
| GPSC | 44.75 | +1.13% | -10.50% |
| CBG | 62.50 | +0.81% | -28.16% |
| HANA | 32.75 | +0.77% | -26.40% |
| OSP | 21.40 | +0.47% | +3.38% |
| INTUCH | 78.25 | +0.32% | +7.93% |
| STEC | 8.05 | +0.00% | -8.52% |
| TTW | 8.65 | +0.00% | -5.46% |
| CKP | 3.58 | +0.00% | -8.21% |
| IRPC | 1.55 | +0.00% | -24.02% |
| EGCO | 108.00 | +0.00% | -15.29% |
| TU | 14.30 | +0.00% | -5.30% |
| RATCH | 28.75 | +0.00% | -9.45% |
| BCPG | 5.40 | +0.00% | -22.86% |
| AP | 7.30 | +0.00% | -34.82% |
| BA | 18.30 | +0.00% | +14.38% |
Standout Performers Among the Gainers
Topping the list, SISB jumped by 5.2%, closing at THB 18.20. Now, that might sound impressive for a single day, but take a peek at its year-to-date (YTD) performance—a staggering 39.33% drop. This tells me we’re likely seeing a short-term bounce, maybe driven by bargain hunters in the education sector, rather than a fundamental turnaround.
Then there’s BTG, up 2.5% for the day and boasting a robust YTD gain of 30.85%. My guess? Their focus on renewables might be resonating with investors looking for safer bets in Thailand’s push toward sustainability. What do you think—could green energy stocks be a smart play in times like these?
Top SET 100 Losers: The Hardest Hit
On the flip side, the SET 100 had its fair share of casualties on May 15. Some of these declines are eye-watering, reflecting sector-specific struggles and broader market fears. Let’s take a look at the top 20 losers, again sourced from the latest market updates [14].
| Company | Price (THB) | Daily Change | YTD Performance |
|---|---|---|---|
| JMT | 10.80 | -14.29% | -40.66% |
| SAWAD | 21.00 | -13.93% | -44.67% |
| JMART | 7.30 | -10.98% | -44.70% |
| TISCO | 82.50 | -9.34% | -16.24% |
| HMPRO | 8.05 | -8.52% | -38.36% |
| AOT | 42.00 | -6.67% | -29.41% |
| CENTEL | 30.25 | -6.20% | -30.06% |
| BBL | 129.50 | -5.82% | -17.25% |
| KCE | 31.50 | -5.26% | -42.20% |
| SCB | 95.00 | -5.00% | -10.38% |
| MINT | 22.80 | -4.60% | -30.06% |
| KBANK | 124.00 | -4.62% | -9.49% |
| KTB | 15.80 | -4.24% | -5.39% |
| BANPU | 5.40 | -3.57% | +5.88% |
| IVL | 16.30 | -3.55% | -40.51% |
| PTTEP | 121.00 | -3.20% | -19.06% |
| PTTGC | 24.40 | -3.17% | -37.44% |
| EA | 3.10 | -3.13% | -86.67% |
| SCC | 203.00 | -2.87% | -33.88% |
| CPN | 50.75 | -2.40% | -27.50% |
Why These Stocks Took the Biggest Hits
Leading the pack of losers, JMT cratered by 14.29%, closing at just THB 10.80. With a YTD loss of over 40%, it’s clear this financial services player is struggling—likely tied to consumers tightening their belts. Then you’ve got SAWAD, down 13.93%, another finance stock battered by declining loan demand as households grapple with economic uncertainty [17].
Tourism and hospitality didn’t fare much better. AOT (Airports of Thailand) slid 6.67%, a direct hit from fewer Chinese tourists—a trend that’s been hurting the Thai Economy since late 2024 [5]. Ever traveled to Thailand and seen the bustling airports? It’s hard to imagine them quieter, but the numbers don’t lie.
Unpacking the Forces Behind SET 100 Volatility
So, why the wild swings in the Stock Market Thailand on May 15? It’s not just about individual companies; there are bigger forces at play. Let’s break down the macroeconomic and global issues shaking up the SET 100 and what they mean for investors like you or me.
U.S. Tariffs: A Looming Threat to Thai Exports
One of the scariest headlines for Thailand right now is the potential 36% tariff on its exports to the U.S., worth around $49 billion annually. If no deal is struck by July, this could be a game-changer. Thailand’s government is pushing for a reduced rate, but analysts warn even a 10% tariff could dent export competitiveness compared to neighbors like Vietnam [18].
For SET 100 companies in manufacturing and trade, this uncertainty is poison. It’s no wonder investor confidence is shaky—how would you feel if your business’s biggest market suddenly became a minefield?
Domestic Woes: Slow Growth and Shaky Confidence
Closer to home, Thailand’s economy isn’t doing itself any favors. Q1 2025 saw GDP growth dip to 2.9% year-on-year, dragged down by an 8.7% drop in Chinese tourist arrivals, a 1.6% contraction in private investment, and flat household spending. These aren’t just stats—they’re red flags for sectors across the SET 100 like retail, tourism, and construction [5].
I can’t help but think of a friend who runs a small guesthouse in Bangkok. He’s been complaining about fewer bookings for months now. That kind of ground-level struggle is exactly what’s showing up in the market data.
Global Market Context: A Rough 2025
Let’s zoom out even further. The global stock market in 2025 has been a rollercoaster, with some analysts pointing to a broader “crash” narrative affecting investor sentiment worldwide. While Thailand’s issues are unique, this global volatility adds another layer of risk for anyone trading in the Stock Market Thailand [19].
When Wall Street sneezes, emerging markets like Thailand often catch a cold. It’s a reminder of how interconnected our financial world is—something to keep in mind if you’re looking at the SET 100 for long-term plays.
How Investors Can Respond to SET 100 Shifts
Okay, the market looks messy, but that doesn’t mean you’re out of options. Volatility in the SET 100 can create buying opportunities if you know where to look. Here are a few strategies I’ve been mulling over—see if they resonate with your investment style.
Go Defensive with Utilities and Essentials
Stocks like GPSC, a utility company in the SET 50, tend to hold up better during downturns thanks to steady demand and government-backed energy subsidies. Their modest 1.13% gain on May 15 isn’t much, but stability is gold right now. Curious about their latest moves? Check out their profile on the SET official website for deeper insights.
Look Beyond the U.S. Market for Exports
With U.S. tariffs on the horizon, companies in agro-industry or those exporting to other regions like ASEAN or Europe might dodge the worst. I’m not saying ignore the big names in the Stock Market Thailand, but diversifying your focus could pay off if trade tensions escalate.
Spot Technical Rebounds in Oversold Stocks
Some of these losers, like JMT, are showing signs of being oversold with Relative Strength Index (RSI) readings below 30. If you’re into technical analysis, this might signal a potential bounce. Of course, timing is everything—have you ever tried catching a falling knife in the market? It’s not for the faint-hearted.
What’s Next for the Stock Market Thailand?
As I wrap up this deep dive into the SET 100 performance on May 15, 2025, one thing is clear: we’re in for a bumpy ride. The combination of domestic economic slowdown, global trade risks, and sector-specific pressures means volatility isn’t going anywhere soon. Thailand’s central bank is already projecting 2025 growth as low as 2.0-2.1%, a far cry from earlier optimism [5][18].
Yet, amid the selloff, there were glimmers of resilience—think BTG and CPALL. For every steep drop like JMT’s, there’s a chance for recovery if broader conditions stabilize. The trick is staying informed and agile. How do you plan to approach this market—ride it out or hunt for bargains?
Let’s Hear From You
I’ve laid out the highs and lows of the SET 100 on May 15, but I’d love to know your take. Are you worried about tariffs derailing Thailand’s recovery, or do you see buying opportunities in these dips? Drop a comment below, share this post with fellow investors, or check out our other market recaps for more insights on the Thai Economy. Let’s keep this conversation going!
Sources
- [5] Thai Growth Likely Slowed in First Quarter on Weak Investment and Consumption – Marketscreener
- [14] Market Movers: SET 100 Top Gainers and Losers – Kaohoon International
- [16] SET Index Performance Update – Kaohoon International
- [17] Thai Consumer Confidence Hits Seven-Month Low – Business Times
- [18] Thailand’s Growth Slow Over Next 2 Years Due to Tariffs – Business Times
- [19] 2025 Stock Market Crash Background – Wikipedia