Jakarta, IDN Times – Market participants are being urged to brace for potential volatility in the financial markets ahead of the upcoming Morgan Stanley Capital International (MSCI) index rebalancing announcement, scheduled for Wednesday, May 13, 2026.
Yusuf Rendy Manilet, an economist at the Center of Reform on Economics (CORE) Indonesia, warns that the rebalancing results could intensify pressure on both the stock market and the Indonesian Rupiah if the outcome falls short of market expectations.
“If the MSCI rebalancing results are poor, it will certainly add pressure to the financial markets and the Rupiah. However, it is crucial to distinguish between what still surprises the market and what has already been anticipated,” Yusuf told IDN Times on Tuesday, May 12, 2026.
1. Markets have already priced in potential changes
According to Yusuf, the market has largely conducted a “pricing in” strategy regarding potential adjustments to the MSCI index composition. Stocks identified as being at risk of exclusion, such as PT Barito Renewables Energy Tbk (BREN) and PT Dian Swastatika Sentosa Tbk (DSSA), have already faced significant selling pressure in recent sessions.
“Furthermore, foreign capital outflows have been occurring over the past few weeks as investor anxiety regarding the MSCI evaluation has escalated,” he emphasized.
2. Investors await the rebalancing data release
Yusuf noted that if the actual announcement aligns with market expectations, the additional impact on financial markets is expected to be limited. Investors have already taken a proactive approach by gradually adjusting their portfolios in advance.
“If the results are in line with expectations, the impact will likely be muted because investors have already adjusted their positions beforehand,” he added.
3. Potential risks of negative surprises
However, the primary risk lies in a “negative surprise” within the rebalancing results. This could occur if more Indonesian stocks are impacted than anticipated, if Indonesia’s index weighting is cut significantly, or if MSCI issues stern notes regarding transparency and domestic market structure.
“If there is a negative surprise, further pressure is very likely. This is especially true as passive funds and ETFs typically execute their adjustments closer to the effective rebalancing date,” he explained.
This scenario could trigger continued volatility in the stock market while simultaneously heightening pressure on the Rupiah in the short term.
Related coverage: Purbaya trusts Bank Indonesia for Rupiah stability ahead of MSCI announcement; Rupiah weakens ahead of MSCI rebalancing release; Rupiah drops to Rp17,533 per US Dollar amid MSCI anticipation.
Summary
Market participants are advised to prepare for potential financial market volatility in anticipation of the Morgan Stanley Capital International (MSCI) index rebalancing announcement on Wednesday, May 13, 2026. Economist Yusuf Rendy Manilet of CORE Indonesia warns that results deviating from market expectations could increase pressure on the stock market and the Indonesian Rupiah. However, he notes that markets have largely priced in potential changes, with stocks at risk of exclusion already experiencing selling pressure and foreign capital outflows occurring due to investor anxiety.
If the MSCI rebalancing announcement aligns with current market expectations, the impact on financial markets is predicted to be minimal as investors have proactively adjusted their portfolios. The main risk stems from a “negative surprise,” such as more Indonesian stocks being affected than anticipated, a significant reduction in Indonesia’s index weighting, or critical notes from MSCI on transparency. Such a scenario could lead to continued stock market volatility and short-term pressure on the Rupiah.