By Julien Le Noble, CEO of Asia
KOSPI’s 36% slide since June has shaken a generation of Korean retail investors who built their portfolios during the AI rally, and risk appetite for Korean equities alone may be low for a while. Their appetite to invest has not gone away though, and the crash has exposed how concentrated their portfolios had become. For Korean and global financial institutions alike, that puts a clear responsibility on the table. It means helping these investors diversify into global markets, rather than leaving them to carry that concentration risk alone.
A record high, then a sharp reversal
KOSPI hit an all time high of 9,385.59 points in June 2026, roughly double where it stood a year earlier, riding the global AI and semiconductor rally. By late July, that rally had gone into reverse.
A single day slide of 5.72% on 24 July was one of the sharpest falls of the month. A selloff in major US tech stocks, driven by investor doubts over whether all that AI infrastructure spending will pay off, hit Korean chipmakers hard, with some falling more than 7% in a single session. Brent crude spiking above $100 a barrel on Middle East tensions, plus new US tariffs on South Korea, added to the pressure. Foreign investors sold around KRW 1.6 trillion of Korean equities in a single day.
Some of that ground came back by 27 July, when KOSPI closed at 6,755.75, up 0.97% on the day, after South Korean firms announced roughly $950 billion in AI cooperation deals with global tech partners, including a $750 billion long term chip supply agreement between SK Group and Nvidia.
The recovery did not last. On 28 July, KOSPI tumbled nearly 11% in its worst session in about five months, as a fresh global selloff in chipmakers hit Korean names again, deepened by Chinese memory maker CXMT’s strong market debut and the competition worries that came with it. The index closed down 732.09 points, or 10.84%, at 6,023.66, its biggest daily loss since 4 March, when it posted a record fall on the outbreak of the Iran war.
That puts KOSPI down around 36% from its June peak in about seven weeks, erasing the late July rebound and then some.
A generation of investors, and a shaken market
Much of the money behind KOSPI’s June rally belonged to a generation of Korean retail investors who grew up trading, not just watching. Easy access trading apps, a culture of active retail participation, and years of a market that mostly moved in one direction pulled younger investors in early, and many built meaningful portfolios almost entirely in the domestic tech and semiconductor names that led the rally up.
The past seven weeks have cost that generation real money. A 36% drawdown does not stay abstract when it sits inside a retirement account, a margin position, or savings earmarked for something else. For investors who were already in the market, the losses are real, and risk appetite for Korean equities specifically is likely to stay low for a while.
What has not disappeared, though, is the underlying habit. Investors who started young, and who have already lived through more than one sharp correction, do not typically stop wanting to invest because one market fell hard. What a crash like this can change is how they think about where that appetite is placed, and how much of it sits in one basket.
The real danger was concentration, not conviction
A portfolio built almost entirely around KOSPI, and within that, heavily around AI and semiconductor names, is a concentrated bet on one market and one growth story. That concentration is what turned a global chip sector wobble into an 11% single day loss for Korean investors on 28 July. A portfolio spread across multiple markets and sectors would have felt the same global shock, but far less sharply.
This is worth separating out clearly, because the two things are not the same. Believing in the AI and semiconductor story is not what hurt investors here. Holding that belief entirely through one market, with no other markets or sectors to absorb the shock, is what did. Many of the Korean retail investors now sitting with losses still see the underlying story as intact over the long term. What the past seven weeks exposed is how much risk was riding on where that belief was held, not whether it was held at all.
Helping clients actually diversify, not just advising it
That distinction matters for the firms serving these investors too, and it points to a role they are well placed to play. Telling a client to diversify is easy but making it possible is the harder, more useful part.
For Korean financial institutions, that means asking whether their own retail clients can act on diversification through the platform they already use. Can a client who wants exposure to US or Japanese equities do that in the same place they already trade, or does reducing concentration risk mean sending them elsewhere to open a separate account. For global securities firms and platforms with Korean clients, the same responsibility runs the other way. Local language support, settlement and compliance handling determine whether helping a client buy into a market outside Korea feels like a natural extension of managing their portfolio, or like an unfamiliar step they are left to figure out alone.
Either way, the underlying job is the same. A firm can agree that diversification is sound portfolio construction, but agreeing is not the same as helping a client actually do it.
Why helping with diversification has been so hard to deliver
Ask most financial institutions, Korean or global, why they have not made diversification easier for clients already, and it usually comes down to the same thing. Adding a market means negotiating local broker relationships, custody, settlement and compliance, one market at a time, and that is slow and expensive work. It is a reasonable explanation for why real diversification support has lagged, even as the case for it has been building for years.
It does not have to stay that way. A single connection into the right infrastructure lets a securities firm offer clients access to the US, Japan, Korea, or wherever their portfolio needs broader footing, without renegotiating that setup market by market. That turns diversification from advice a firm gives into something a client can actually act on, in the same account they already use.
KOSPI’s crash did not end this generation of Korean investors’ appetite to invest, and it should not be read as an argument against the AI and semiconductor story either. What it exposed is narrower and more useful than that. It showed how much risk sits quietly inside a portfolio concentrated in a single market, however strong the story behind that market may be. Helping clients spread that appetite across more markets is not just sound advice after an event like this but also a service that financial institutions are positioned to actually provide.