Vietnam stocks in September: Waiting for the next wave
Vietnam's stock market is entering a special phase as two major themes converge in September: portfolio rebalancing by exchange-traded funds (ETFs) and new international capital flows following the market status upgrade.
According to a report by VPS Securities, September could be one of the busiest ETF rebalancing periods of the year, with Fubon FTSE Vietnam ETF, VanEck Vietnam ETF and Xtrackers Vietnam Swap UCITS ETF all making portfolio adjustments.
The simultaneous rebalancing of multiple funds is expected to significantly increase trading liquidity and price volatility, particularly for large-cap stocks and those with high weights in ETF portfolios.
The most notable aspect of the September rebalancing is not only which stocks ETFs will buy or sell, but also the emergence of structural capital flows following Vietnam's market status upgrade.
FTSE Russell is set to reclassify Vietnam's stock market status from "frontier" to "secondary emerging" from September 21 this year.
VPS estimates that total inflows from passive investment funds into Vietnam's market could reach nearly $2.4 billion, with most of the money coming from Vanguard funds.
Large-cap stocks such as VIC, VHM and VCB, as well as some mid-cap names including HPG, VPB and BID, are expected to attract larger inflows because they could be included simultaneously in multiple funds tracking Large Cap and Mid Cap indices, as well as actively managed funds using FTSE as a benchmark.
However, the capital is not expected to be deployed all at once but in four stages. The first tranche, accounting for about 10%, or roughly $240 million, is expected to be deployed in September 2026. The next three tranches are scheduled for March 2027, June 2027 and September 2027, accounting for 20%, 35% and 35%, respectively.
Passive funds are expected to complete their portfolio rebalancing by September 18, 2026 at the latest.
If the forecasts materialize, the new capital flows could provide significant additional demand for the market, particularly for large-cap stocks that meet the criteria of international indices.
VIC faces heavy ETF selling pressure but remains in line for new foreign inflows
Among large-cap stocks, VIC (Vingroup) is the most notable case, with buying and selling pressure expected from different ETF flows at the same time.
For Fubon FTSE Vietnam ETF, VPS expects VIC's weighting to be cut from 20.4% to the 10% cap. This would translate into selling of about 3.75 million shares worth around VND960 billion ($36.84 million). VHM (Vinhomes) is also expected to have its weighting reduced from 13.2% to 10%, resulting in the sale of nearly 4 million shares worth about VND298 billion ($11.44 million).
Meanwhile, Xtrackers Vietnam Swap UCITS ETF is expected to make a more significant adjustment. The fund currently has a 27.9% weighting in VIC and will have to cut it to the 15% cap. Under the base-case scenario, it could sell as many as 6.05 million VIC shares, worth about VND1.24 trillion ($47.58 million).
On the other hand, passive funds tracking the FTSE GEIS system are expected to buy a net 5.74 million VIC shares, worth about VND1.47 trillion ($56.41 million). For VHM, expected purchases stand at around 10.69 million shares, worth more than VND803 billion ($30.81 million).
This shows that selling pressure from some ETFs during the rebalancing does not necessarily mean foreign capital is exiting these stocks. Instead, the composition of capital flows could change significantly as new funds begin adding Vietnamese stocks to their portfolios following the market upgrade.
Besides VIC and VHM, HPG, VPB, SSI, SHB, VIX and VCB are also expected to attract significant purchases from passive funds tracking FTSE GEIS. HPG could see purchases of more than 20.5 million shares worth about VND445 billion ($17.08 million), while VIX could attract nearly 12.7 million shares and VPB more than 10.6 million shares. VCB could also see purchases of more than 6 million shares.
For Fubon FTSE Vietnam ETF alone, VPB, ACB, FPT, MCH and VPL are expected to attract the strongest inflows. All are new additions to the fund. VPB could see purchases of more than 21.5 million shares, ACB nearly 15.8 million shares, and FPT more than 7.6 million shares.
On the selling side, VND, VCI, KDH and KBC could face relatively strong pressure, with around 10.3 million, 8.8 million, 5.5 million and 4.3 million shares, respectively, expected to be sold.
VanEck Vietnam ETF is also expected to make notable changes, adding SSB and removing CEO from its portfolio. SSB could see purchases of around 13.8 million shares, while CEO could face selling pressure of about 3.73 million shares.
Xtrackers is also expected to create significant volatility in VIC by sharply reducing its weighting in the stock. On the buying side, NVL, VIX, SHB, VHM and HPG are expected to benefit significantly. If BSR is added to the portfolio, the stock could see purchases of more than 5.25 million shares worth around VND141 billion ($5.41 million).
The September rebalancing reflects an important shift in Vietnam's market: ETF capital is no longer simply rotating among stocks in existing indices, but is being joined by large-scale passive inflows linked to the market status upgrade.
As a result, price movements in some stocks could be significant during September 14-18. Investors, however, need to distinguish between technical buying and selling triggered by portfolio rebalancing and new, longer-term investment flows.
Source: Kha Moc, Thai Ha
Photo: Photo by The Investor/Lien Thuong

