China's Economy Is Slowing Down. Here's the Real Channel That Reaches Your Indonesian Portfolio
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5 min read
China's economy grew just 4.3% year on year in the second quarter of 2026, down from 5.0% in the first quarter and the slowest pace since late 2022. If you hold Indonesian stocks, this is not a distant headline. China's economic slowdown reaches your portfolio through one specific, traceable channel: how much of Indonesia's coal, palm oil and nickel it still wants to buy.
China has been Indonesia's largest trading partner for 13 straight years. In 2025, the two countries traded $167.4 billion worth of goods, and China alone bought $67.04 billion of Indonesia's exports, about 23.8% of everything Indonesia sold abroad that year (China Briefing, TradeImeX trade data, 2025 figures). Trade between the two countries carried on at $39.04 billion in the first quarter of 2026 alone.
Put plainly: close to a quarter of every dollar Indonesia earns from exporting goods comes from one buyer. When that buyer's own economy cools off, it does not have to stop buying Indonesian goods to affect your portfolio. It just has to buy a little less, or pay a little less, for the price of what it buys to move.
"Global sentiment" is the vague version of this story. The specific version is commodity demand, and coal is the clearest example. China imported about 490 million tonnes of coal in 2025, down 9.6% from the year before, as it leaned more on its own domestic mines. Even with that pullback, Indonesia held onto its position as China's largest coal supplier, providing roughly 44.2% of China's coal imports, about 211 million tonnes (The Coal Hub, 2025 trade data).
That tug of war between softer Chinese demand and Indonesia's still-dominant supplier position shows up directly in price. The ICI4 coal price benchmark fell to a four-year low of $40.68 per tonne in July 2025, then climbed back to $63.80 per tonne by April 2026, a 57% swing in under a year. A weaker or stronger China is one of the forces behind moves like that, alongside currency, freight costs and China's own domestic mining output.
Nickel's link to China runs through stainless steel and electric-vehicle batteries, both mostly made in China. Global stainless steel demand, the biggest single user of nickel, grew only 3% to 4% in 2025, down from 7% growth in 2024, as China's construction sector kept struggling under its ongoing property slump (Coface, 2026 nickel market analysis). China's steel demand overall is expected to stay roughly flat or edge lower again in 2026 for the same reason.
Indonesia mines more than half the world's nickel, so this is not a side note for the IHSG (Indonesia's main stock index). The specific price moves and the Indonesian mining stocks most exposed to them, including ANTM and ADRO, are covered in Indonesia's commodity export economy and your portfolio. This post's job is narrower: China's own construction and EV demand is the reason nickel demand has been soft, not just "the market."
In May 2026, Indonesia announced that coal, palm oil and nickel exports would move through new state-controlled trading arrangements starting 1 June 2026, replacing the more flexible arrangements private exporters used before (Fortune, Caixin Global, May 2026). That policy change landed at almost the exact moment Chinese demand for Indonesian coal was already softening. A slower buyer and a less flexible seller at the same time is worth watching, though it is too early to say how the two interact over a full year, since the policy took effect only two and a half months ago.
China publishes two numbers on a predictable schedule that are more useful than any single news headline. GDP comes out quarterly. The Purchasing Managers' Index, or PMI, a monthly survey that asks factory managers whether new orders and production are growing or shrinking, comes out every month, and it moves faster than GDP does. China's official manufacturing PMI fell to 49.2% in July 2026, down 1.1 percentage points from June and below the 50-point line that separates expansion from contraction (National Bureau of Statistics of China, official July 2026 release).
A reading under 50 does not by itself tell you what happens to the rupiah or the IHSG next. It tells you Chinese factory activity is contracting, which is one input into whether China's commodity demand keeps softening or stabilizes. NetWort's Macro Context page tracks the BI rate, the rupiah and other macro indicators together, so you can see what is actually moving in Indonesia's own numbers alongside a signal like this one, rather than guessing from a single headline.