Vietnam Foreign Inflows: VCB Leads VND 719B Net Buy Before FTSE Upgrade

Overview

Foreign investors net bought more than VND 719 billion on the HOSE session of September 15, reversing the net-selling pattern that dominated the first half of the month, ahead of Vietnam’s formal reclassification to FTSE Russell secondary emerging market status on September 21. Vietcombank (VCB) attracted the largest single inflow at over VND 228 billion, followed by BIDV (BID) at nearly VND 125 billion. The buying clustered in the 27 Vietnamese stocks set to enter the FTSE Global All Cap index.

Key Facts

• Foreign investors bought more than VND 3,073 billion and sold about VND 2,354 billion on September 15, for a net buy of over VND 719 billion.
• The prior session, September 14, saw a net buy of nearly VND 822 billion, bringing the two-day total to more than VND 1,540 billion.
• Matched-order trading accounted for over 98% of the two-day net buy, at more than VND 1,514 billion; put-through activity contributed negligibly.
• Between September 3 and 11, foreign investors net sold roughly VND 3,063 billion; the two most recent sessions recovered about half of that.
• Eleven FTSE-listed stocks drew combined net buying of about VND 833 billion on September 15, exceeding the VND 719 billion market-wide net buy.
• VCB led at over VND 228 billion, then BID near VND 125 billion, SSB about VND 92 billion, HDB nearly VND 84 billion and FPT about VND 82 billion.
• MBS Research estimates the 27 Vietnamese names could attract about USD 180 million from ETFs in the September restructuring, with VIC, VHM and HPG among the largest expected buys.

What Happened

On September 15, foreign investors recorded a net buy of more than VND 719 billion on the Ho Chi Minh City exchange, according to market trading data. The reversal followed a net-selling stretch from September 3 to 11 totalling roughly VND 3,063 billion, and a shorter buying window of about VND 952 billion across the five sessions from August 24 to 28, immediately after FTSE Russell published its Vietnamese constituent list on August 21.

The September 15 flow was selective rather than broad. Eleven of the 27 Vietnamese stocks slated for the FTSE Global All Cap drew combined net buying of about VND 833 billion, a figure larger than the whole-market net buy, implying that buying in index names was partly offset by selling elsewhere. VCB rose 2.56% on the session, BID 2.94%, SSB 6.91%, HDB 1.12%, FPT 0.41% and VPL 1.66%. Notably, VIC, VHM and HPG, which MBS Research flags among the largest expected beneficiaries of passive ETF restructuring, did not rank among the heaviest net buys that day.

Market Context

VCB trades on HOSE and closed at VND 60,000 on September 15, with BID at VND 36,800, HDB at VND 27,100 and SSB at VND 20,900. The inflow arrives as Vietnam prepares to move from frontier to secondary emerging market status under FTSE Russell from September 21, with an initial 10% investable weight before further tranches through three periods in 2027. The buying spans banking (VCB, BID, SSB, HDB, VPB, SHB, MSB), technology (FPT), consumer staples (MCH, MSN), real estate (VIC, VHM, VPL) and steel (HPG), reflecting the index composition rather than a single-sector call.

Strategic Significance

For long-term investors, the September flow is a test of whether index-driven demand is broad or narrow. The fact that 11 FTSE names absorbed more net buying than the entire market suggests passive and pre-positioning money is concentrating in the largest, most liquid constituents, while smaller or less liquid names in the list may see thinner incremental demand. The staged 10% initial weight, with full inclusion only through 2027, means the reclassification is a multi-year flow story rather than a single-event catalyst. Banks dominate the early buying, consistent with their index weight and liquidity, but the divergence between expected ETF beneficiaries (VIC, VHM, HPG) and actual September 15 flows shows that pre-upgrade positioning can differ materially from eventual passive allocations.

What to Watch

• The September 21 effective date, when the 27 Vietnamese stocks formally enter the FTSE Global All Cap at the initial 10% investable weight.
• Daily foreign net flow data through the remainder of September to see whether the two-session buying streak extends or fades after the upgrade.
• Whether VIC, VHM and HPG begin to register net foreign buying, given MBS Research’s USD 180 million ETF estimate for the September restructuring.
• FTSE Russell’s published schedule for the three 2027 weight-increase tranches, which will frame the multi-year flow path.
• Third-quarter earnings and any foreign-ownership room filings for VCB and BID, the two largest recipients of the September 15 inflow.