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Indonesia stocks rebound but rupiah stays weak near 18,050

Indonesia stocks rebound but rupiah stays weak near 18,050
Markets · 2026
Photo · Marcus Devlin for Daily Digest Invest
By Marcus Devlin Equities Correspondent Oct 22, 2026 4 min read

Indonesian stocks rebounded on Thursday, but the currency remained under pressure, highlighting the challenges facing the country's financial markets. The Jakarta Composite index climbed 1.6% after Bank Indonesia left its benchmark interest rate unchanged and took steps to loosen liquidity. However, the rupiah hovered near 18,050 per US dollar, a level that signals persistent weakness.

What Bank Indonesia did

Bank Indonesia, the country's central bank, kept its main policy rate steady, a move that was widely expected. More notably, it adjusted the plumbing of the financial system: it raised the overnight deposit rate and cut reserve requirements for banks. Lower reserve requirements free up cash that banks can lend or use to manage short-term funding needs, which can help calm stress in money markets.

These measures are designed to support liquidity without resorting to a rate cut, which could further weaken the currency. By easing funding conditions, the central bank hopes to keep the financial system functioning smoothly while it continues to defend the rupiah.

The disconnect: stocks up, currency down

The stock market's rise and the currency's slide may seem contradictory, but they reflect different forces. The Jakarta Composite's gain was likely driven by relief that the central bank didn't tighten policy, along with the liquidity boost. But the rupiah's weakness is tied to deeper concerns about foreign investor demand.

A key worry is MSCI, the index provider, which has warned that it could reclassify Indonesian equities as “standalone” rather than part of its emerging-market indexes. That label matters because many global funds track MSCI's benchmarks. If Indonesia is removed from those indexes, passive funds that mirror them would be forced to sell Indonesian stocks, regardless of how well local companies are performing. Active managers who benchmark against MSCI would also likely reduce their exposure.

This threat has been hanging over the market for some time. The Jakarta Composite is still about 8% below its level before the warning was issued, a sign that investors have already priced in some risk of exclusion.

Why the rupiah stays weak

The rupiah's slide is also part of a broader trend across emerging Asia. A cautious mood among global investors, driven by concerns about US interest rates and global growth, has made it harder for countries like Indonesia to attract the foreign capital they need.

When foreign investors pull back, the currency tends to weaken, and that can feed into higher borrowing costs for the government. Indonesian bond yields have been under pressure, with the 10-year yield around 7.446%. Higher yields are needed to compensate investors for the added risk of holding Indonesian assets, but they also raise the cost of government debt.

What it means for investors

For everyday investors, the key takeaway is that a stock market rebound doesn't always translate into a stronger currency. The Jakarta Composite's 1.6% gain is a positive sign, but it may not be enough to reverse the rupiah's slide if foreign demand remains weak.

If MSCI follows through on its standalone warning, the impact could be significant. Indonesia could lose its place in major emerging-market benchmarks, triggering mechanical selling from passive index funds and benchmarked active managers. That would thin out liquidity and push up the extra return investors demand to hold Indonesian assets, which could weigh on both stocks and bonds.

For now, investors are watching two things: whether Bank Indonesia's liquidity measures are enough to stabilize the currency, and whether MSCI decides to act on its warning. The central bank's next moves will be crucial, as it tries to balance supporting growth with defending the rupiah.

In the meantime, the disconnect between stocks and currency is a reminder that markets are not always in sync. A rebound in one asset class doesn't guarantee strength in another, especially when structural issues like index exclusion loom.

For those with exposure to Indonesian assets, the situation calls for patience and a close eye on policy developments. The rupiah's path will likely depend on global risk appetite and the central bank's ability to manage expectations.

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