Factory activity across key Asian economies stayed in growth mode in September, according to purchasing managers' surveys released this week. Japan, South Korea, and Taiwan all reported expanding manufacturing sectors, with AI-related demand providing a notable tailwind even as energy costs remained elevated.
These surveys, known as purchasing managers' indexes (PMIs), are based on monthly questionnaires sent to factory managers. They ask about new orders, output, employment, and input costs. A reading above 50 signals expansion, while below 50 points to contraction. The latest numbers suggest that demand, not just inventory rebuilding, is doing the heavy lifting.
What the numbers show
In South Korea, a major exporter of electronics, cars, and semiconductors, the manufacturing PMI rose to 53.9 in September. That is a solidly expansionary reading, and respondents reported the strongest growth in export orders in recent months. The pickup was widely attributed to demand for AI-related components and equipment, which has been a bright spot for the region's tech-heavy exporters.
Japan and Taiwan also stayed in expansion territory, though the brief does not specify their exact readings. Both economies have significant exposure to the global tech supply chain, and both have benefited from the surge in demand for AI infrastructure, from advanced chips to server components.
Notably, the expansion came despite energy costs remaining high. Higher oil and gas prices typically squeeze manufacturers' margins and can weigh on activity, but the latest surveys suggest that robust demand is offsetting those cost pressures for now.
Why AI demand matters
The AI boom has been a powerful driver for Asian manufacturers. Companies around the world are investing heavily in data centers, cloud computing, and AI models, all of which require vast amounts of semiconductors, memory chips, and other electronic components. Taiwan is home to the world's largest contract chipmaker, TSMC, while South Korea's Samsung and SK Hynix are leading producers of memory chips. Japan, meanwhile, supplies specialized materials and equipment used in chip manufacturing.
For investors, the PMI data is a useful gauge of the health of the global tech supply chain. When Asian factories are humming, it often signals that demand for tech products is strong, which can bode well for companies across the sector. The September readings suggest that the AI-driven demand cycle is still intact, even as some other parts of the global economy show signs of slowing.
What it means for investors
For everyday investors, the key takeaway is that the AI boom continues to support manufacturing activity in Asia, which is a positive sign for the global economy. Strong factory data from Japan, South Korea, and Taiwan can lift sentiment for tech stocks and related industries, as it suggests that orders are flowing and supply chains are busy.
However, it's worth noting that the picture is not uniform across the region. Australia's factory activity slipped back into contraction in September, and Japan's factory growth cooled compared with the previous month, even though it remained in expansion. This suggests that the recovery is uneven and that some economies are more reliant on the AI tailwind than others.
Investors should also keep an eye on energy costs. If oil and gas prices continue to rise, they could eventually erode the margins of manufacturers, even those with strong demand. The fact that factories are expanding despite high energy costs is encouraging, but it's a trend worth monitoring.
For those with exposure to Asian equities or tech funds, the PMI data is a reassuring sign. South Korean stocks have slipped recently despite record exports, as currency weakness and rising yields have weighed on sentiment. But the underlying factory activity remains solid, which could support earnings in the coming quarters.
Similarly, foreign investors sold Taiwan stocks in September, but the manufacturing data suggests the island's tech exporters are still performing well. For investors, this divergence between market sentiment and economic fundamentals is worth noting.
Looking ahead
The next few months will show whether this AI-driven momentum can be sustained. Key factors to watch include the pace of global tech spending, the trajectory of energy prices, and any shifts in central bank policy. Japan's economic council has urged the Bank of Japan to coordinate policy, which could affect the yen and, in turn, the competitiveness of Japanese exporters.
For now, the September PMIs offer a clear message: Asia's factories are still growing, and AI is a big reason why. For investors, that's a reason to stay constructive on the region's tech sector, while keeping an eye on the risks.
